diff --git a/tests/Android.build.mk b/tests/Android.build.mk
new file mode 100644
index 0000000..33e0a0b
--- /dev/null
+++ b/tests/Android.build.mk
@@ -0,0 +1,85 @@
+#
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := $(module)
+LOCAL_MODULE_TAGS := $(module_tag)
+
+LOCAL_CLANG := $($(module)_clang_$(build_type))
+
+LOCAL_FORCE_STATIC_EXECUTABLE := $($(module)_force_static_executable)
+
+LOCAL_ADDITIONAL_DEPENDENCIES := \
+    $(LOCAL_PATH)/Android.mk \
+    $(LOCAL_PATH)/Android.build.mk \
+
+LOCAL_CFLAGS := \
+    $(common_cflags) \
+    $($(module)_cflags) \
+    $($(module)_cflags_$(build_type)) \
+
+LOCAL_CONLYFLAGS += \
+    $(common_conlyflags) \
+    $($(module)_conlyflags) \
+    $($(module)_conlyflags_$(build_type)) \
+
+LOCAL_CPPFLAGS += \
+    $(common_cppflags) \
+    $($(module)_cppflags) \
+    $($(module)_cppflags_$(build_type)) \
+
+LOCAL_C_INCLUDES := \
+    $(common_c_includes) \
+    $($(module)_c_includes) \
+    $($(module)_c_includes_$(build_type)) \
+
+LOCAL_SRC_FILES := \
+    $($(module)_src_files) \
+    $($(module)_src_files_$(build_type)) \
+
+LOCAL_STATIC_LIBRARIES := \
+    $($(module)_static_libraries) \
+    $($(module)_static_libraries_$(build_type)) \
+
+LOCAL_SHARED_LIBRARIES := \
+    $($(module)_shared_libraries) \
+    $($(module)_shared_libraries_$(build_type)) \
+
+LOCAL_WHOLE_STATIC_LIBRARIES := \
+    $($(module)_whole_static_libraries) \
+    $($(module)_whole_static_libraries_$(build_type)) \
+
+LOCAL_LDFLAGS := \
+    $($(module)_ldflags) \
+    $($(module)_ldflags_$(build_type)) \
+
+LOCAL_LDLIBS := \
+    $($(module)_ldlibs) \
+    $($(module)_ldlibs_$(build_type)) \
+
+ifeq ($(build_type),target)
+  include external/stlport/libstlport.mk
+
+  include $(BUILD_$(build_target))
+endif
+
+ifeq ($(build_type),host)
+  # Only build if host builds are supported.
+  ifeq ($(build_host),true)
+    include $(BUILD_HOST_$(build_target))
+  endif
+endif
diff --git a/tests/Android.mk b/tests/Android.mk
index ee22c35..e658b4d 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -22,19 +22,23 @@
 # Unit tests.
 # -----------------------------------------------------------------------------
 
-test_c_flags = \
+ifeq ($(HOST_OS)-$(HOST_ARCH),$(filter $(HOST_OS)-$(HOST_ARCH),linux-x86 linux-x86_64))
+build_host := true
+else
+build_host := false
+endif
+
+# -----------------------------------------------------------------------------
+# All standard tests.
+# -----------------------------------------------------------------------------
+test_cflags = \
     -fstack-protector-all \
     -g \
     -Wall -Wextra \
     -Werror \
     -fno-builtin \
 
-ifeq ($(TARGET_ARCH),arm64)
-  $(info TODO: $(LOCAL_PATH)/Android.mk -fstack-protector not yet available for the AArch64 toolchain)
-  test_c_flags += -fno-stack-protector
-endif # arm64
-
-test_src_files = \
+libBionicStandardTests_src_files := \
     buffer_tests.cpp \
     dirent_test.cpp \
     eventfd_test.cpp \
@@ -54,6 +58,7 @@
     signal_test.cpp \
     stack_protector_test.cpp \
     stack_unwinding_test.cpp \
+    stack_unwinding_test_impl.c \
     statvfs_test.cpp \
     stdio_test.cpp \
     stdlib_test.cpp \
@@ -73,106 +78,168 @@
     time_test.cpp \
     unistd_test.cpp \
 
-test_dynamic_ldflags = -Wl,--export-dynamic -Wl,-u,DlSymTestFunction
-test_dynamic_src_files = \
-    dlfcn_test.cpp \
+libBionicStandardTests_cflags := \
+    $(test_cflags) \
 
-test_fortify_static_libraries = \
-    fortify1-tests-gcc fortify2-tests-gcc fortify1-tests-clang fortify2-tests-clang
+libBionicStandardTests_ldlibs_host := \
+    -lrt \
 
-include $(CLEAR_VARS)
-LOCAL_MODULE := bionic-unit-tests-unwind-test-impl
-LOCAL_CFLAGS += $(test_c_flags) -fexceptions -fnon-call-exceptions
-LOCAL_SRC_FILES := stack_unwinding_test_impl.c
-include $(BUILD_STATIC_LIBRARY)
-
-include $(CLEAR_VARS)
-LOCAL_MODULE := bionic-unit-tests-unwind-test-impl-host
-LOCAL_CFLAGS += $(test_c_flags) -fexceptions -fnon-call-exceptions
-LOCAL_SRC_FILES := stack_unwinding_test_impl.c
-include $(BUILD_HOST_STATIC_LIBRARY)
-
-# Build tests for the device (with bionic's .so). Run with:
-#   adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests
-include $(CLEAR_VARS)
-LOCAL_MODULE := bionic-unit-tests
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_CFLAGS += $(test_c_flags)
-LOCAL_LDFLAGS += $(test_dynamic_ldflags)
-LOCAL_SHARED_LIBRARIES += libdl
-LOCAL_SRC_FILES := $(test_src_files) $(test_dynamic_src_files)
-LOCAL_WHOLE_STATIC_LIBRARIES := $(test_fortify_static_libraries)
-LOCAL_STATIC_LIBRARIES += bionic-unit-tests-unwind-test-impl
-include $(BUILD_NATIVE_TEST)
-
-# Build tests for the device (with bionic's .a). Run with:
-#   adb shell /data/nativetest/bionic-unit-tests-static/bionic-unit-tests-static
-include $(CLEAR_VARS)
-LOCAL_MODULE := bionic-unit-tests-static
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_FORCE_STATIC_EXECUTABLE := true
-LOCAL_WHOLE_STATIC_LIBRARIES += libBionicTests
-LOCAL_STATIC_LIBRARIES += libstlport_static libstdc++ libm libc
-include $(BUILD_NATIVE_TEST)
+module := libBionicStandardTests
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
 
 # -----------------------------------------------------------------------------
-# We build the static unit tests as a library so they can be used both for
-# bionic-unit-tests-static and also as part of CTS.
+# Fortify tests.
 # -----------------------------------------------------------------------------
+$(foreach compiler,gcc clang, \
+  $(foreach test,1 2, \
+    $(eval fortify$(test)-tests-$(compiler)_cflags := \
+      $(test_cflags) \
+      -U_FORTIFY_SOURCE \
+      -D_FORTIFY_SOURCE=$(test) \
+      -DTEST_NAME=Fortify$(test)_$(compiler)); \
+    $(eval fortify$(test)-tests-$(compiler)_cflags_host := \
+      -Wno-error); \
+    $(eval fortify$(test)-tests-$(compiler)_src_files := \
+      fortify_test.cpp); \
+    $(eval fortify_libs += fortify$(test)-tests-$(compiler)); \
+  ) \
+)
 
-include $(CLEAR_VARS)
-LOCAL_MODULE := libBionicTests
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_CFLAGS += $(test_c_flags)
-LOCAL_SRC_FILES := $(test_src_files)
-LOCAL_CFLAGS += \
-    -DGTEST_OS_LINUX_ANDROID \
-    -DGTEST_HAS_STD_STRING \
+module := fortify1-tests-gcc
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
 
-LOCAL_C_INCLUDES += \
-    bionic bionic/libstdc++/include \
-    external/gtest/include \
-    external/stlport/stlport \
+module := fortify2-tests-gcc
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
 
-LOCAL_WHOLE_STATIC_LIBRARIES := \
-    $(test_fortify_static_libraries) \
-    bionic-unit-tests-unwind-test-impl \
+fortify1-tests-clang_clang_target := true
+fortify1-tests-clang_cflags_host := -D__clang__
 
-include $(BUILD_STATIC_LIBRARY)
+module := fortify1-tests-clang
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
+
+fortify2-tests-clang_clang_target := true
+
+fortify2-tests-clang_cflags_host := -D__clang__
+
+module := fortify2-tests-clang
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
 
 # -----------------------------------------------------------------------------
-# Test library for the unit tests.
+# Library of all tests (excluding the dynamic linker tests).
 # -----------------------------------------------------------------------------
+libBionicTests_whole_static_libraries := \
+    libBionicStandardTests \
+    $(fortify_libs) \
 
-# Build no-elf-hash-table-library.so to test dlopen(3) on a library that
-# only has a GNU-style hash table. MIPS doesn't support GNU hash style.
-ifneq ($(TARGET_ARCH),mips)
-include $(CLEAR_VARS)
-LOCAL_MODULE := no-elf-hash-table-library
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_SRC_FILES := empty.cpp
-LOCAL_LDFLAGS := -Wl,--hash-style=gnu
-include $(BUILD_SHARED_LIBRARY)
+module := libBionicTests
+module_tag := optional
+build_type := target
+build_target := STATIC_TEST_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+build_type := host
+include $(LOCAL_PATH)/Android.build.mk
+
+# -----------------------------------------------------------------------------
+# Library used by dlfcn tests.
+# -----------------------------------------------------------------------------
+ifneq ($(TARGET_ARCH),$(filter $(TARGET_ARCH),mips mips64))
+no-elf-hash-table-library_src_files := \
+    empty.cpp \
+
+no-elf-hash-table-library_ldflags := \
+    -Wl,--hash-style=gnu \
+
+module := no-elf-hash-table-library
+module_tag := optional
+build_type := target
+build_target := SHARED_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
 endif
 
 # -----------------------------------------------------------------------------
-# Unit tests built against glibc.
+# Tests for the device using bionic's .so. Run with:
+#   adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests
 # -----------------------------------------------------------------------------
+bionic-unit-tests_whole_static_libraries := \
+    libBionicTests \
 
-# Build tests for the host (with glibc).
-# Note that this will build against glibc, so it's not useful for testing
-# bionic's implementation, but it does let you use glibc as a reference
-# implementation for testing the tests themselves.
-ifeq ($(HOST_OS)-$(HOST_ARCH),linux-x86)
-include $(CLEAR_VARS)
-LOCAL_MODULE := bionic-unit-tests-glibc
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_CFLAGS += $(test_c_flags)
-LOCAL_LDFLAGS += -lpthread -ldl -lrt
-LOCAL_LDFLAGS += $(test_dynamic_ldflags)
-LOCAL_SRC_FILES := $(test_src_files) $(test_dynamic_src_files)
-LOCAL_STATIC_LIBRARIES += bionic-unit-tests-unwind-test-impl-host
-include $(BUILD_HOST_NATIVE_TEST)
+bionic-unit-tests_src_files := \
+    dlfcn_test.cpp \
+
+bionic-unit-tests_ldflags := \
+    -Wl,--export-dynamic \
+    -Wl,-u,DlSymTestFunction \
+
+bionic-unit-tests_shared_libraries_target := \
+    libdl \
+
+module := bionic-unit-tests
+module_tag := optional
+build_type := target
+build_target := NATIVE_TEST
+include $(LOCAL_PATH)/Android.build.mk
+
+# -----------------------------------------------------------------------------
+# Tests for the device linked against bionic's static library. Run with:
+#   adb shell /data/nativetest/bionic-unit-tests-static/bionic-unit-tests-static
+# -----------------------------------------------------------------------------
+bionic-unit-tests-static_whole_static_libraries := \
+    libBionicTests \
+
+bionic-unit-tests-static_static_libraries := \
+    libstlport_static \
+    libm \
+    libc \
+    libstdc++ \
+
+bionic-unit-tests-static_force_static_executable := true
+
+module := bionic-unit-tests-static
+module_tag := optional
+build_type := target
+build_target := NATIVE_TEST
+include $(LOCAL_PATH)/Android.build.mk
+
+# -----------------------------------------------------------------------------
+# Tests to run on the host and linked against glibc. Run with:
+#   cd bionic/tests; mm bionic-unit-tests-glibc-run
+# -----------------------------------------------------------------------------
+bionic-unit-tests-glibc_whole_static_libraries := \
+    libBionicStandardTests \
+
+bionic-unit-tests-glibc_ldlibs := \
+    -lrt \
+
+module := bionic-unit-tests-glibc
+module_tag := optional
+build_type := host
+build_target := NATIVE_TEST
+include $(LOCAL_PATH)/Android.build.mk
 
 # gtest needs ANDROID_DATA/local/tmp for death test output.
 # Make sure to create ANDROID_DATA/local/tmp if doesn't exist.
@@ -182,12 +249,10 @@
 	ANDROID_DATA=$(TARGET_OUT_DATA) \
 	ANDROID_ROOT=$(TARGET_OUT) \
 		$(HOST_OUT_EXECUTABLES)/bionic-unit-tests-glibc
-endif
 
 # -----------------------------------------------------------------------------
 # Run the unit tests built against x86 bionic on an x86 host.
 # -----------------------------------------------------------------------------
-
 ifeq ($(HOST_OS)-$(HOST_ARCH),linux-x86)
 ifeq ($(TARGET_ARCH),$(filter $(TARGET_ARCH),x86 x86_64))
 ifeq ($(TARGET_ARCH),x86)
@@ -213,55 +278,4 @@
 endif
 endif
 
-# -----------------------------------------------------------------------------
-# FORTIFY_SOURCE tests
-# -----------------------------------------------------------------------------
-
-fortify_c_includes = \
-    bionic \
-    bionic/libstdc++/include \
-    external/stlport/stlport \
-    external/gtest/include
-fortify_test_files = fortify_test.cpp
-
-# -Wno-error=unused-parameter needed as
-# external/stlport/stlport/stl/_threads.c (included from
-# external/gtest/include/gtest/gtest.h) does not compile cleanly under
-# clang. TODO: fix this.
-fortify_c_flags = $(test_c_flags) -Wno-error=unused-parameter
-
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := $(fortify_test_files)
-LOCAL_MODULE := fortify1-tests-gcc
-LOCAL_CFLAGS += $(fortify_c_flags) -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DTEST_NAME=Fortify1_Gcc
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_C_INCLUDES += $(fortify_c_includes)
-include $(BUILD_STATIC_LIBRARY)
-
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := $(fortify_test_files)
-LOCAL_MODULE := fortify2-tests-gcc
-LOCAL_CFLAGS += $(fortify_c_flags) -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -DTEST_NAME=Fortify2_Gcc
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_C_INCLUDES += $(fortify_c_includes)
-include $(BUILD_STATIC_LIBRARY)
-
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := $(fortify_test_files)
-LOCAL_MODULE := fortify1-tests-clang
-LOCAL_CLANG := true
-LOCAL_CFLAGS += $(fortify_c_flags) -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DTEST_NAME=Fortify1_Clang
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_C_INCLUDES += $(fortify_c_includes)
-include $(BUILD_STATIC_LIBRARY)
-
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := $(fortify_test_files)
-LOCAL_MODULE := fortify2-tests-clang
-LOCAL_CLANG := true
-LOCAL_CFLAGS += $(fortify_c_flags) -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -DTEST_NAME=Fortify2_Clang
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
-LOCAL_C_INCLUDES += $(fortify_c_includes)
-include $(BUILD_STATIC_LIBRARY)
-
 endif # !BUILD_TINY_ANDROID
diff --git a/tests/eventfd_test.cpp b/tests/eventfd_test.cpp
index 2c2c5f0..aa88a3b 100644
--- a/tests/eventfd_test.cpp
+++ b/tests/eventfd_test.cpp
@@ -14,11 +14,25 @@
  * limitations under the License.
  */
 
+#include <errno.h>
+#include <fcntl.h>
+
 #include <gtest/gtest.h>
 
-#if !defined(__GLIBC__) // Android's prebuilt gcc's header files don't include <sys/eventfd.h>.
-
+#if defined(__BIONIC__) // Android's prebuilt gcc's header files don't include <sys/eventfd.h>.
 #include <sys/eventfd.h>
+#else
+// Include the necessary components of sys/eventfd.h right here.
+#include <stdint.h>
+
+typedef uint64_t eventfd_t;
+
+__BEGIN_DECLS
+extern int eventfd(int, int);
+extern int eventfd_read(int, eventfd_t*);
+extern int eventfd_write(int, eventfd_t);
+__END_DECLS
+#endif
 
 TEST(eventfd, smoke) {
   unsigned int initial_value = 2;
@@ -43,5 +57,3 @@
 
   close(fd);
 }
-
-#endif
diff --git a/tests/fortify_test.cpp b/tests/fortify_test.cpp
index 408991e..67e197e 100644
--- a/tests/fortify_test.cpp
+++ b/tests/fortify_test.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <gtest/gtest.h>
+#include <signal.h>
 #include <string.h>
 #include <stdarg.h>
 #include <sys/types.h>
@@ -139,19 +140,21 @@
 }
 #endif
 
-#if __BIONIC__
-
 #ifndef __clang__
 // zero sized target with "\0" source (should fail)
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strcpy_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   char* src = strdup("");
   ASSERT_EXIT(strcpy(myfoo.empty, src),
               testing::KilledBySignal(SIGABRT), "");
   free(src);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
@@ -160,12 +163,16 @@
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strcpy2_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   char* src = strdup("1");
   ASSERT_EXIT(strcpy(myfoo.empty, src),
               testing::KilledBySignal(SIGABRT), "");
   free(src);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
@@ -174,12 +181,16 @@
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strcpy3_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   char* src = strdup("12");
   ASSERT_EXIT(strcpy(myfoo.one, src),
               testing::KilledBySignal(SIGABRT), "");
   free(src);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
@@ -187,12 +198,16 @@
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strchr_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   memcpy(myfoo.a, "0123456789", sizeof(myfoo.a));
   myfoo.b[0] = '\0';
   ASSERT_EXIT(printf("%s", strchr(myfoo.a, 'a')),
               testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
@@ -200,12 +215,16 @@
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strrchr_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   memcpy(myfoo.a, "0123456789", 10);
   memcpy(myfoo.b, "01234", 6);
   ASSERT_EXIT(printf("%s", strrchr(myfoo.a, 'a')),
               testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
@@ -213,12 +232,16 @@
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strlcpy_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   strcpy(myfoo.a, "01");
   size_t n = strlen(myfoo.a);
   ASSERT_EXIT(strlcpy(myfoo.one, myfoo.a, n),
               testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
@@ -226,6 +249,7 @@
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
 TEST(DEATHTEST, strlcat_fortified2) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   foo myfoo;
   strcpy(myfoo.a, "01");
@@ -233,11 +257,12 @@
   size_t n = strlen(myfoo.a);
   ASSERT_EXIT(strlcat(myfoo.one, myfoo.a, n),
               testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 #endif
 
-#endif /* __BIONIC__ */
-
 #ifndef __clang__
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.
@@ -310,74 +335,106 @@
 
 #endif /* defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE=2 */
 
-#if __BIONIC__
 // multibyte target where we over fill (should fail)
 TEST(DEATHTEST, strcpy_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
   char *orig = strdup("0123456789");
   ASSERT_EXIT(strcpy(buf, orig), testing::KilledBySignal(SIGABRT), "");
   free(orig);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 // zero sized target with "\0" source (should fail)
 TEST(DEATHTEST, strcpy2_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[0];
   char *orig = strdup("");
   ASSERT_EXIT(strcpy(buf, orig), testing::KilledBySignal(SIGABRT), "");
   free(orig);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 // zero sized target with longer source (should fail)
 TEST(DEATHTEST, strcpy3_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[0];
   char *orig = strdup("1");
   ASSERT_EXIT(strcpy(buf, orig), testing::KilledBySignal(SIGABRT), "");
   free(orig);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 // one byte target with longer source (should fail)
 TEST(DEATHTEST, strcpy4_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[1];
   char *orig = strdup("12");
   ASSERT_EXIT(strcpy(buf, orig), testing::KilledBySignal(SIGABRT), "");
   free(orig);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(DEATHTEST, strlen_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
   memcpy(buf, "0123456789", sizeof(buf));
   ASSERT_EXIT(printf("%zd", strlen(buf)), testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(DEATHTEST, strchr_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
   memcpy(buf, "0123456789", sizeof(buf));
   ASSERT_EXIT(printf("%s", strchr(buf, 'a')), testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(DEATHTEST, strrchr_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
   memcpy(buf, "0123456789", sizeof(buf));
   ASSERT_EXIT(printf("%s", strrchr(buf, 'a')), testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(DEATHTEST, strlcpy_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char bufa[15];
   char bufb[10];
   strcpy(bufa, "01234567890123");
   size_t n = strlen(bufa);
   ASSERT_EXIT(strlcpy(bufb, bufa, n), testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(DEATHTEST, strlcat_fortified) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char bufa[15];
   char bufb[10];
@@ -385,10 +442,11 @@
   strcpy(bufa, "01234567890123");
   size_t n = strlen(bufa);
   ASSERT_EXIT(strlcat(bufb, bufa, n), testing::KilledBySignal(SIGABRT), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
-#endif
-
 TEST(DEATHTEST, sprintf_fortified) {
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
diff --git a/tests/getauxval_test.cpp b/tests/getauxval_test.cpp
index 01c11c3..51c9db8 100644
--- a/tests/getauxval_test.cpp
+++ b/tests/getauxval_test.cpp
@@ -31,10 +31,11 @@
 #endif
 
 #if defined(GETAUXVAL_CAN_COMPILE)
-
 #include <sys/auxv.h>
+#endif
 
 TEST(getauxval, expected_values) {
+#if defined(GETAUXVAL_CAN_COMPILE)
   ASSERT_EQ((unsigned long int) 0, getauxval(AT_SECURE));
   ASSERT_EQ(getuid(), getauxval(AT_UID));
   ASSERT_EQ(geteuid(), getauxval(AT_EUID));
@@ -46,10 +47,15 @@
   ASSERT_NE((unsigned long int) 0, getauxval(AT_PHNUM));
   ASSERT_NE((unsigned long int) 0, getauxval(AT_ENTRY));
   ASSERT_NE((unsigned long int) 0, getauxval(AT_PAGESZ));
+#else
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
 }
 
 TEST(getauxval, unexpected_values) {
+#if defined(GETAUXVAL_CAN_COMPILE)
   ASSERT_EQ((unsigned long int) 0, getauxval(0xdeadbeef));
+#else
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
 }
-
-#endif /* GETAUXVAL_CAN_COMPILE */
diff --git a/tests/inttypes_test.cpp b/tests/inttypes_test.cpp
index df02d1f..ac37e62 100644
--- a/tests/inttypes_test.cpp
+++ b/tests/inttypes_test.cpp
@@ -19,7 +19,6 @@
 #include <stdio.h>
 #include <inttypes.h>
 
-#if defined(__BIONIC__) // Doesn't work on glibc because we use -m32.
 TEST(inttypes, misc) {
   char buf[512];
 
@@ -39,4 +38,3 @@
   sscanf(buf, "%08" SCNuPTR, &u);
   sscanf(buf, "%08" SCNxPTR, &u);
 }
-#endif
diff --git a/tests/libc_logging_test.cpp b/tests/libc_logging_test.cpp
index c44b85b..950161e 100644
--- a/tests/libc_logging_test.cpp
+++ b/tests/libc_logging_test.cpp
@@ -17,12 +17,12 @@
 #include <gtest/gtest.h>
 
 #if defined(__BIONIC__)
-
 #include "../libc/bionic/libc_logging.cpp"
-
 extern int __libc_format_buffer(char* buffer, size_t buffer_size, const char* format, ...);
+#endif // __BIONIC__
 
 TEST(libc_logging, smoke) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
 
   __libc_format_buffer(buf, sizeof(buf), "a");
@@ -104,21 +104,33 @@
 
   __libc_format_buffer(buf, sizeof(buf), "a%lld,%d,%d,%dz", 0x1000000000LL, 6, 7, 8);
   EXPECT_STREQ("a68719476736,6,7,8z", buf);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libc_logging, d_INT_MAX) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
   __libc_format_buffer(buf, sizeof(buf), "%d", INT_MAX);
   EXPECT_STREQ("2147483647", buf);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libc_logging, d_INT_MIN) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
   __libc_format_buffer(buf, sizeof(buf), "%d", INT_MIN);
   EXPECT_STREQ("-2147483648", buf);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libc_logging, ld_LONG_MAX) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
   __libc_format_buffer(buf, sizeof(buf), "%ld", LONG_MAX);
 #if __LP64__
@@ -126,9 +138,13 @@
 #else
   EXPECT_STREQ("2147483647", buf);
 #endif
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libc_logging, ld_LONG_MIN) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
   __libc_format_buffer(buf, sizeof(buf), "%ld", LONG_MIN);
 #if __LP64__
@@ -136,18 +152,27 @@
 #else
   EXPECT_STREQ("-2147483648", buf);
 #endif
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libc_logging, lld_LLONG_MAX) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
   __libc_format_buffer(buf, sizeof(buf), "%lld", LLONG_MAX);
   EXPECT_STREQ("9223372036854775807", buf);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libc_logging, lld_LLONG_MIN) {
+#if defined(__BIONIC__)
   char buf[BUFSIZ];
   __libc_format_buffer(buf, sizeof(buf), "%lld", LLONG_MIN);
   EXPECT_STREQ("-9223372036854775808", buf);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-
-#endif
diff --git a/tests/libgen_test.cpp b/tests/libgen_test.cpp
index c2c01f6..cae646f 100644
--- a/tests/libgen_test.cpp
+++ b/tests/libgen_test.cpp
@@ -38,7 +38,9 @@
   free(writable_in);
 }
 
-TEST(libgen, basename) {
+// Do not use basename as the test name, it's defined to another value in glibc
+// so leads to a differently named test on host versus target architectures.
+TEST(libgen, basename_smoke) {
   TestBasename(NULL, ".");
   TestBasename("", ".");
   TestBasename("/usr/lib", "lib");
@@ -62,8 +64,7 @@
   TestDirname("/", "/");
 }
 
-#if __BIONIC__
-
+#if defined(__BIONIC__)
 static void TestBasename(const char* in, const char* expected_out, int expected_rc,
                          char* buf, size_t buf_size, int expected_errno) {
   errno = 0;
@@ -85,8 +86,10 @@
   }
   ASSERT_EQ(expected_errno, errno) << in;
 }
+#endif // __BIONIC__
 
 TEST(libgen, basename_r) {
+#if defined(__BIONIC__)
   char buf[256];
   TestBasename("", ".",  1, NULL, 0, 0);
   TestBasename("", ".", -1, buf, 0, ERANGE);
@@ -99,9 +102,13 @@
   TestBasename("/", "/", 1, buf, sizeof(buf), 0);
   TestBasename(".", ".", 1, buf, sizeof(buf), 0);
   TestBasename("..", "..", 2, buf, sizeof(buf), 0);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(libgen, dirname_r) {
+#if defined(__BIONIC__)
   char buf[256];
   TestDirname("", ".",  1, NULL, 0, 0);
   TestDirname("", ".", -1, buf, 0, ERANGE);
@@ -112,6 +119,7 @@
   TestDirname("usr", ".", 1, buf, sizeof(buf), 0);
   TestDirname(".", ".", 1, buf, sizeof(buf), 0);
   TestDirname("..", ".", 1, buf, sizeof(buf), 0);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-
-#endif
diff --git a/tests/math_test.cpp b/tests/math_test.cpp
index 454646d..c8974d3 100644
--- a/tests/math_test.cpp
+++ b/tests/math_test.cpp
@@ -104,61 +104,73 @@
 }
 */
 
-#if defined(__BIONIC__)
 TEST(math, __fpclassifyd) {
+#if defined(__BIONIC__)
   ASSERT_EQ(FP_INFINITE, __fpclassifyd(HUGE_VAL));
   ASSERT_EQ(FP_NAN, __fpclassifyd(nan("")));
   ASSERT_EQ(FP_NORMAL, __fpclassifyd(1.0));
   ASSERT_EQ(FP_SUBNORMAL, __fpclassifyd(double_subnormal()));
   ASSERT_EQ(FP_ZERO, __fpclassifyd(0.0));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, __fpclassifyf) {
+#if defined(__BIONIC__)
   ASSERT_EQ(FP_INFINITE, __fpclassifyf(HUGE_VALF));
   ASSERT_EQ(FP_NAN, __fpclassifyf(nanf("")));
   ASSERT_EQ(FP_NORMAL, __fpclassifyf(1.0f));
   ASSERT_EQ(FP_SUBNORMAL, __fpclassifyf(float_subnormal()));
   ASSERT_EQ(FP_ZERO, __fpclassifyf(0.0f));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, __fpclassifyl) {
+#if defined(__BIONIC__)
   EXPECT_EQ(FP_INFINITE, __fpclassifyl(HUGE_VALL));
   EXPECT_EQ(FP_NAN, __fpclassifyl(nanl("")));
   EXPECT_EQ(FP_NORMAL, __fpclassifyl(1.0));
   EXPECT_EQ(FP_SUBNORMAL, __fpclassifyl(double_subnormal()));
   EXPECT_EQ(FP_ZERO, __fpclassifyl(0.0));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(math, finitef) {
   ASSERT_TRUE(finitef(123.0f));
   ASSERT_FALSE(finitef(HUGE_VALF));
 }
 
-#if defined(__BIONIC__)
 TEST(math, __isfinite) {
+#if defined(__BIONIC__)
   ASSERT_TRUE(__isfinite(123.0));
   ASSERT_FALSE(__isfinite(HUGE_VAL));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, __isfinitef) {
+#if defined(__BIONIC__)
   ASSERT_TRUE(__isfinitef(123.0f));
   ASSERT_FALSE(__isfinitef(HUGE_VALF));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, __isfinitel) {
+#if defined(__BIONIC__)
   ASSERT_TRUE(__isfinitel(123.0f));
   ASSERT_FALSE(__isfinitel(HUGE_VALL));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(math, finite) {
   ASSERT_TRUE(finite(123.0));
@@ -190,26 +202,32 @@
   ASSERT_TRUE(isnanf(nanf("")));
 }
 
-#if defined(__BIONIC__)
 TEST(math, __isnormal) {
+#if defined(__BIONIC__)
   ASSERT_TRUE(__isnormal(123.0));
   ASSERT_FALSE(__isnormal(double_subnormal()));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, __isnormalf) {
+#if defined(__BIONIC__)
   ASSERT_TRUE(__isnormalf(123.0f));
   ASSERT_FALSE(__isnormalf(float_subnormal()));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, __isnormall) {
+#if defined(__BIONIC__)
   ASSERT_TRUE(__isnormall(123.0));
   ASSERT_FALSE(__isnormall(double_subnormal()));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(math, __signbit) {
   ASSERT_EQ(0, __signbit(0.0));
@@ -1005,21 +1023,25 @@
   ASSERT_FLOAT_EQ(logf(24.0f), gammaf(5.0f));
 }
 
-#if defined(__BIONIC__)
 TEST(math, gamma_r) {
+#if defined(__BIONIC__)
   int sign;
   ASSERT_FLOAT_EQ(log(24.0), gamma_r(5.0, &sign));
   ASSERT_EQ(1, sign);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if defined(__BIONIC__)
 TEST(math, gammaf_r) {
+#if defined(__BIONIC__)
   int sign;
   ASSERT_FLOAT_EQ(logf(24.0f), gammaf_r(5.0f, &sign));
   ASSERT_EQ(1, sign);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(math, lgamma) {
   ASSERT_FLOAT_EQ(log(24.0), lgamma(5.0));
diff --git a/tests/pthread_test.cpp b/tests/pthread_test.cpp
index 33317d9..d234118 100644
--- a/tests/pthread_test.cpp
+++ b/tests/pthread_test.cpp
@@ -20,6 +20,7 @@
 #include <inttypes.h>
 #include <limits.h>
 #include <pthread.h>
+#include <signal.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
@@ -31,8 +32,8 @@
   ASSERT_EQ(EINVAL, pthread_key_delete(key));
 }
 
-#if !defined(__GLIBC__) // glibc uses keys internally that its sysconf value doesn't account for.
 TEST(pthread, pthread_key_create_lots) {
+#if defined(__BIONIC__) // glibc uses keys internally that its sysconf value doesn't account for.
   // POSIX says PTHREAD_KEYS_MAX should be at least 128.
   ASSERT_GE(PTHREAD_KEYS_MAX, 128);
 
@@ -59,8 +60,10 @@
   for (size_t i = 0; i < keys.size(); ++i) {
     ASSERT_EQ(0, pthread_key_delete(keys[i]));
   }
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 static void* IdFn(void* arg) {
   return arg;
@@ -249,31 +252,40 @@
   ASSERT_EQ(0, pthread_sigmask(SIG_SETMASK, &original_set, NULL));
 }
 
-#if __BIONIC__
+#if defined(__BIONIC__)
 extern "C" pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg);
+#endif // __BIONIC__
+
 TEST(pthread, __bionic_clone) {
+#if defined(__BIONIC__)
   // Check that our hand-written clone assembler sets errno correctly on failure.
   uintptr_t fake_child_stack[16];
   errno = 0;
   ASSERT_EQ(-1, __bionic_clone(CLONE_THREAD, &fake_child_stack[16], NULL, NULL, NULL, NULL, NULL));
   ASSERT_EQ(EINVAL, errno);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
 TEST(pthread, pthread_setname_np__too_long) {
+#if defined(__BIONIC__) // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
   ASSERT_EQ(ERANGE, pthread_setname_np(pthread_self(), "this name is far too long for linux"));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
 TEST(pthread, pthread_setname_np__self) {
+#if defined(__BIONIC__) // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
   ASSERT_EQ(0, pthread_setname_np(pthread_self(), "short 1"));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
 TEST(pthread, pthread_setname_np__other) {
+#if defined(__BIONIC__) // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
   // Emulator kernels don't currently support setting the name of other threads.
   char* filename = NULL;
   asprintf(&filename, "/proc/self/task/%d/comm", gettid());
@@ -288,18 +300,22 @@
   } else {
     fprintf(stderr, "skipping test: this kernel doesn't have /proc/self/task/tid/comm files!\n");
   }
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if __BIONIC__ // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
 TEST(pthread, pthread_setname_np__no_such_thread) {
+#if defined(__BIONIC__) // Not all build servers have a new enough glibc? TODO: remove when they're on gprecise.
   pthread_t dead_thread;
   MakeDeadThread(dead_thread);
 
   // Call pthread_setname_np after thread has already exited.
   ASSERT_EQ(ESRCH, pthread_setname_np(dead_thread, "short 3"));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(pthread, pthread_kill__0) {
   // Signal 0 just tests that the thread exists, so it's safe to call on ourselves.
@@ -511,13 +527,13 @@
   ASSERT_EQ(0, pthread_attr_setstacksize(&attributes, 32*1024 + 1));
   ASSERT_EQ(0, pthread_attr_getstacksize(&attributes, &stack_size));
   ASSERT_EQ(32*1024U + 1, stack_size);
-#if __BIONIC__
+#if defined(__BIONIC__)
   // Bionic rounds up, which is what POSIX allows.
   ASSERT_EQ(GetActualStackSize(attributes), (32 + 4)*1024U);
-#else
+#else // __BIONIC__
   // glibc rounds down, in violation of POSIX. They document this in their BUGS section.
   ASSERT_EQ(GetActualStackSize(attributes), 32*1024U);
-#endif
+#endif // __BIONIC__
 }
 
 TEST(pthread, pthread_rwlock_smoke) {
diff --git a/tests/stack_protector_test.cpp b/tests/stack_protector_test.cpp
index 2ba8a87..fea24d8 100644
--- a/tests/stack_protector_test.cpp
+++ b/tests/stack_protector_test.cpp
@@ -27,17 +27,13 @@
 #include <unistd.h>
 #include <set>
 
-#ifdef __GLIBC__
-
+#if defined(__GLIBC__)
 // glibc doesn't expose gettid(2).
 pid_t gettid() { return syscall(__NR_gettid); }
-
-#endif
-
-#ifdef __i386__
+#endif // __GLIBC__
 
 // For x86, bionic and glibc have per-thread stack guard values (all identical).
-
+#if defined(__i386__)
 static uint32_t GetGuardFromTls() {
   uint32_t guard;
   asm ("mov %%gs:0x14, %0": "=d" (guard));
@@ -71,8 +67,10 @@
   checker->Check();
   return NULL;
 }
+#endif // __i386__
 
 TEST(stack_protector, same_guard_per_thread) {
+#if defined(__i386__)
   stack_protector_checker checker;
   size_t thread_count = 10;
   for (size_t i = 0; i < thread_count; ++i) {
@@ -86,24 +84,19 @@
 
   // bionic and glibc use the same guard for every thread.
   ASSERT_EQ(1U, checker.guards.size());
+#else // __i386__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __i386__
 }
 
-#endif
-
-#if defined(__BIONIC__) || defined(__arm__) || defined(__mips__)
-
 // For ARM and MIPS, glibc has a global stack check guard value.
+#if defined(__BIONIC__) || defined(__arm__) || defined(__mips__)
+#define TEST_STACK_CHK_GUARD
 
 // Bionic has the global for x86 too, to support binaries that can run on
 // Android releases that didn't implement the TLS guard value.
-
 extern "C" uintptr_t __stack_chk_guard;
 
-TEST(stack_protector, global_guard) {
-  ASSERT_NE(0, gettid());
-  ASSERT_NE(0U, __stack_chk_guard);
-}
-
 /*
  * When this function returns, the stack canary will be inconsistent
  * with the previous value, which will generate a call to __stack_chk_fail(),
@@ -116,10 +109,22 @@
 static void do_modify_stack_chk_guard() {
   __stack_chk_guard = 0x12345678;
 }
+#endif
 
-TEST(stack_protector_DeathTest, modify_stack_protector) {
-  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
-  ASSERT_EXIT(do_modify_stack_chk_guard(), testing::KilledBySignal(SIGABRT), "");
+TEST(stack_protector, global_guard) {
+#if defined(TEST_STACK_CHK_GUARD)
+  ASSERT_NE(0, gettid());
+  ASSERT_NE(0U, __stack_chk_guard);
+#else // TEST_STACK_CHK_GUARD
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // TEST_STACK_CHK_GUARD
 }
 
-#endif
+TEST(stack_protector_DeathTest, modify_stack_protector) {
+#if defined(TEST_STACK_CHK_GUARD)
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(do_modify_stack_chk_guard(), testing::KilledBySignal(SIGABRT), "");
+#else // TEST_STACK_CHK_GUARD
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // TEST_STACK_CHK_GUARD
+}
diff --git a/tests/stack_unwinding_test.cpp b/tests/stack_unwinding_test.cpp
index 3b18daa..1024f28 100644
--- a/tests/stack_unwinding_test.cpp
+++ b/tests/stack_unwinding_test.cpp
@@ -20,8 +20,6 @@
 
 #include <gtest/gtest.h>
 
-#if defined(i386) // Only our x86 unwinding is good enough. Switch to libunwind?
-
 extern "C" {
   void do_test();
 }
@@ -29,8 +27,11 @@
 // We have to say "DeathTest" here so gtest knows to run this test (which exits)
 // in its own process.
 TEST(stack_unwinding_DeathTest, unwinding_through_signal_frame) {
+// Only our x86 unwinding is good enough. Switch to libunwind?
+#if defined(__BIONIC__) && defined(__i386__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   ASSERT_EXIT(do_test(), ::testing::ExitedWithCode(42), "");
+#else // __i386__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __i386__
 }
-
-#endif
diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index bd3c548..027de34 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -107,7 +107,7 @@
   // glibc sometimes doesn't set errno in this particular case.
 #if defined(__BIONIC__)
   ASSERT_EQ(EBADF, errno);
-#endif
+#endif // __BIONIC__
 }
 
 TEST(stdio, getline) {
@@ -176,7 +176,7 @@
   // glibc sometimes doesn't set errno in this particular case.
 #if defined(__BIONIC__)
   ASSERT_EQ(EBADF, errno);
-#endif
+#endif // __BIONIC__
 }
 
 TEST(stdio, printf_ssize_t) {
@@ -191,8 +191,8 @@
   snprintf(buf, sizeof(buf), "%zd", v);
 }
 
-#if !defined(__GLIBC__)
 TEST(stdio, snprintf_n_format_specifier_not_implemented) {
+#if defined(__BIONIC__)
   char buf[32];
   int i = 0;
   // We deliberately don't implement %n, so it's treated like
@@ -200,8 +200,10 @@
   EXPECT_EQ(5, snprintf(buf, sizeof(buf), "a %n b", &i));
   EXPECT_EQ(0, i);
   EXPECT_STREQ("a n b", buf);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(stdio, snprintf_smoke) {
   char buf[BUFSIZ];
@@ -283,9 +285,9 @@
   snprintf(buf, sizeof(buf), "a%d,%pz", 5, p);
 #if defined(__BIONIC__)
   EXPECT_STREQ("a5,0x0z", buf);
-#else
+#else // __BIONIC__
   EXPECT_STREQ("a5,(nil)z", buf);
-#endif
+#endif // __BIONIC__
 
   snprintf(buf, sizeof(buf), "a%lld,%d,%d,%dz", 0x1000000000LL, 6, 7, 8);
   EXPECT_STREQ("a68719476736,6,7,8z", buf);
diff --git a/tests/string_test.cpp b/tests/string_test.cpp
index 1a7e27d..c35976a 100644
--- a/tests/string_test.cpp
+++ b/tests/string_test.cpp
@@ -46,14 +46,16 @@
   ASSERT_STREQ("Unknown error 1234", strerror(1234));
 }
 
-#if __BIONIC__ // glibc's strerror isn't thread safe, only its strsignal.
-
+#if defined(__BIONIC__)
 static void* ConcurrentStrErrorFn(void*) {
   bool equal = (strcmp("Unknown error 2002", strerror(2002)) == 0);
   return reinterpret_cast<void*>(equal);
 }
+#endif // __BIONIC__
 
+// glibc's strerror isn't thread safe, only its strsignal.
 TEST(string, strerror_concurrent) {
+#if defined(__BIONIC__)
   const char* strerror1001 = strerror(1001);
   ASSERT_STREQ("Unknown error 1001", strerror1001);
 
@@ -64,12 +66,13 @@
   ASSERT_TRUE(static_cast<bool>(result));
 
   ASSERT_STREQ("Unknown error 1001", strerror1001);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
-#endif
-
-#if __BIONIC__ // glibc's strerror_r doesn't even have the same signature as the POSIX one.
 TEST(string, strerror_r) {
+#if defined(__BIONIC__) // glibc's strerror_r doesn't even have the same signature as the POSIX one.
   char buf[256];
 
   // Valid.
@@ -87,8 +90,10 @@
   // Buffer too small.
   ASSERT_EQ(-1, strerror_r(0, buf, 2));
   ASSERT_EQ(ERANGE, errno);
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(string, strsignal) {
   // A regular signal.
@@ -478,8 +483,8 @@
 }
 
 
-#if __BIONIC__
 TEST(string, strlcat) {
+#if defined(__BIONIC__)
   StringTestState<char> state(SMALL);
   for (size_t i = 0; i < state.n; i++) {
     for (size_t j = 0; j < POS_ITER; j++) {
@@ -504,11 +509,13 @@
       ASSERT_TRUE(memcmp(state.ptr, state.ptr2, state.MAX_LEN + state.len[i]) == 0);
     }
   }
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
-#if __BIONIC__
 TEST(string, strlcpy) {
+#if defined(__BIONIC__)
   StringTestState<char> state(SMALL);
   for (size_t j = 0; j < POS_ITER; j++) {
     state.NewIteration();
@@ -539,8 +546,10 @@
     ASSERT_FALSE((memcmp(state.ptr1, state.ptr, state.MAX_LEN) != 0) ||
                  (memcmp(state.ptr2, state.ptr + state.MAX_LEN, state.MAX_LEN) != 0));
   }
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(string, strncat) {
   StringTestState<char> state(SMALL);
@@ -732,10 +741,10 @@
   }
 }
 
-#if defined(__BIONIC__)
 extern "C" int __memcmp16(const unsigned short *ptr1, const unsigned short *ptr2, size_t n);
 
 TEST(string, __memcmp16) {
+#if defined(__BIONIC__)
   StringTestState<unsigned short> state(SMALL);
 
   for (size_t i = 0; i < state.n; i++) {
@@ -758,8 +767,10 @@
       ASSERT_EQ(expected, actual);
     }
   }
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(string, wmemcmp) {
   StringTestState<wchar_t> state(SMALL);
diff --git a/tests/stubs_test.cpp b/tests/stubs_test.cpp
index 2e1acc1..7d70aa6 100644
--- a/tests/stubs_test.cpp
+++ b/tests/stubs_test.cpp
@@ -23,8 +23,7 @@
 #include <limits.h>
 #include <unistd.h>
 
-#if __BIONIC__
-
+#if defined(__BIONIC__)
 #define CHECK_GETPWNAM_FOR(username, uid, uid_type) \
     SCOPED_TRACE(username); \
     ASSERT_NO_FATAL_FAILURE(check_getpwnam(username, uid, uid_type));
@@ -51,6 +50,10 @@
 
   EXPECT_STREQ("/system/bin/sh", pwd->pw_shell);
 }
+#else
+#define CHECK_GETPWNAM_FOR(username, uid, uid_type) \
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif
 
 TEST(getpwnam, system_id_root) {
   CHECK_GETPWNAM_FOR("root", 0, TYPE_SYSTEM);
@@ -104,5 +107,3 @@
 TEST(getpwnam, app_id_u1_i0) {
   CHECK_GETPWNAM_FOR("u1_i0", 199000, TYPE_APP);
 }
-
-#endif /* __BIONIC__ */
diff --git a/tests/sys_epoll_test.cpp b/tests/sys_epoll_test.cpp
index e4e047b..daa064a 100644
--- a/tests/sys_epoll_test.cpp
+++ b/tests/sys_epoll_test.cpp
@@ -17,6 +17,7 @@
 #include <gtest/gtest.h>
 
 #include <errno.h>
+#include <signal.h>
 #include <sys/epoll.h>
 
 TEST(sys_epoll, smoke) {
diff --git a/tests/sys_select_test.cpp b/tests/sys_select_test.cpp
index 57afc9b..4bb2d18 100644
--- a/tests/sys_select_test.cpp
+++ b/tests/sys_select_test.cpp
@@ -17,6 +17,7 @@
 #include <gtest/gtest.h>
 
 #include <errno.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <sys/select.h>
 
diff --git a/tests/sys_sendfile_test.cpp b/tests/sys_sendfile_test.cpp
index bf23d3d..3d6b5cc 100644
--- a/tests/sys_sendfile_test.cpp
+++ b/tests/sys_sendfile_test.cpp
@@ -42,7 +42,6 @@
   ASSERT_STREQ("ll", buf);
 }
 
-#if __BIONIC__
 TEST(sys_sendfile, sendfile64) {
   TemporaryFile src_file;
   ASSERT_EQ(5, TEMP_FAILURE_RETRY(write(src_file.fd, "hello", 5)));
@@ -61,4 +60,3 @@
   ASSERT_EQ(2, TEMP_FAILURE_RETRY(read(dst_file.fd, &buf, 2)));
   ASSERT_STREQ("ll", buf);
 }
-#endif
diff --git a/tests/system_properties_test.cpp b/tests/system_properties_test.cpp
index 5367972..bfd5854 100644
--- a/tests/system_properties_test.cpp
+++ b/tests/system_properties_test.cpp
@@ -20,7 +20,7 @@
 #include <unistd.h>
 #include <string>
 
-#if __BIONIC__
+#if defined(__BIONIC__)
 
 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
 #include <sys/_system_properties.h>
@@ -69,7 +69,54 @@
     void *old_pa;
 };
 
+static void foreach_test_callback(const prop_info *pi, void* cookie) {
+    size_t *count = static_cast<size_t *>(cookie);
+
+    ASSERT_NE((prop_info *)NULL, pi);
+    (*count)++;
+}
+
+static void hierarchical_test_callback(const prop_info *pi, void *cookie) {
+    bool (*ok)[8][8] = static_cast<bool (*)[8][8]>(cookie);
+
+    char name[PROP_NAME_MAX];
+    char value[PROP_VALUE_MAX];
+
+    __system_property_read(pi, name, value);
+
+    int name_i, name_j, name_k;
+    int value_i, value_j, value_k;
+    ASSERT_EQ(3, sscanf(name, "property_%d.%d.%d", &name_i, &name_j, &name_k));
+    ASSERT_EQ(3, sscanf(value, "value_%d.%d.%d", &value_i, &value_j, &value_k));
+    ASSERT_EQ(name_i, value_i);
+    ASSERT_GE(name_i, 0);
+    ASSERT_LT(name_i, 8);
+    ASSERT_EQ(name_j, value_j);
+    ASSERT_GE(name_j, 0);
+    ASSERT_LT(name_j, 8);
+    ASSERT_EQ(name_k, value_k);
+    ASSERT_GE(name_k, 0);
+    ASSERT_LT(name_k, 8);
+
+    ok[name_i][name_j][name_k] = true;
+}
+
+static void *PropertyWaitHelperFn(void *arg) {
+    int *flag = (int *)arg;
+    prop_info *pi;
+    pi = (prop_info *)__system_property_find("property");
+    usleep(100000);
+
+    *flag = 1;
+    __system_property_update(pi, "value3", 6);
+
+    return NULL;
+}
+
+#endif // __BIONIC__
+
 TEST(properties, add) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
 
@@ -87,9 +134,13 @@
 
     ASSERT_EQ(6, __system_property_get("property_other", propvalue));
     ASSERT_STREQ(propvalue, "value3");
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, update) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
 
@@ -120,9 +171,13 @@
 
     ASSERT_EQ(6, __system_property_get("property_other", propvalue));
     ASSERT_STREQ(propvalue, "value6");
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, fill) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
     char prop_name[PROP_NAME_MAX];
@@ -161,16 +216,13 @@
         ASSERT_EQ(PROP_VALUE_MAX - 1, __system_property_get(prop_name, prop_value_ret));
         ASSERT_EQ(0, memcmp(prop_value, prop_value_ret, PROP_VALUE_MAX));
     }
-}
-
-static void foreach_test_callback(const prop_info *pi, void* cookie) {
-    size_t *count = static_cast<size_t *>(cookie);
-
-    ASSERT_NE((prop_info *)NULL, pi);
-    (*count)++;
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, foreach) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
     size_t count = 0;
@@ -181,9 +233,13 @@
 
     ASSERT_EQ(0, __system_property_foreach(foreach_test_callback, &count));
     ASSERT_EQ(3U, count);
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, find_nth) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
 
@@ -201,34 +257,13 @@
     ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(100));
     ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(200));
     ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(247));
-}
-
-static void hierarchical_test_callback(const prop_info *pi, void *cookie) {
-    bool (*ok)[8][8] = static_cast<bool (*)[8][8]>(cookie);
-
-    char name[PROP_NAME_MAX];
-    char value[PROP_VALUE_MAX];
-
-    __system_property_read(pi, name, value);
-
-    int name_i, name_j, name_k;
-    int value_i, value_j, value_k;
-    ASSERT_EQ(3, sscanf(name, "property_%d.%d.%d", &name_i, &name_j, &name_k));
-    ASSERT_EQ(3, sscanf(value, "value_%d.%d.%d", &value_i, &value_j, &value_k));
-    ASSERT_EQ(name_i, value_i);
-    ASSERT_GE(name_i, 0);
-    ASSERT_LT(name_i, 8);
-    ASSERT_EQ(name_j, value_j);
-    ASSERT_GE(name_j, 0);
-    ASSERT_LT(name_j, 8);
-    ASSERT_EQ(name_k, value_k);
-    ASSERT_GE(name_k, 0);
-    ASSERT_LT(name_k, 8);
-
-    ok[name_i][name_j][name_k] = true;
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, fill_hierarchical) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
     char prop_name[PROP_NAME_MAX];
@@ -279,9 +314,13 @@
             }
         }
     }
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, errors) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
     char prop_value[PROP_NAME_MAX];
@@ -296,9 +335,13 @@
     ASSERT_EQ(-1, __system_property_add("name", PROP_NAME_MAX, "value", 5));
     ASSERT_EQ(-1, __system_property_add("name", 4, "value", PROP_VALUE_MAX));
     ASSERT_EQ(-1, __system_property_update(NULL, "value", PROP_VALUE_MAX));
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, serial) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
     const prop_info *pi;
@@ -309,22 +352,13 @@
     serial = __system_property_serial(pi);
     ASSERT_EQ(0, __system_property_update((prop_info *)pi, "value2", 6));
     ASSERT_NE(serial, __system_property_serial(pi));
-}
-
-static void *PropertyWaitHelperFn(void *arg)
-{
-    int *flag = (int *)arg;
-    prop_info *pi;
-    pi = (prop_info *)__system_property_find("property");
-    usleep(100000);
-
-    *flag = 1;
-    __system_property_update(pi, "value3", 6);
-
-    return NULL;
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 TEST(properties, wait) {
+#if defined(__BIONIC__)
     LocalPropertyTestState pa;
     ASSERT_TRUE(pa.valid);
     unsigned int serial;
@@ -346,6 +380,9 @@
 
     void* result;
     ASSERT_EQ(0, pthread_join(t, &result));
+#else // __BIONIC__
+    GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
 
 class KilledByFault {
@@ -362,6 +399,7 @@
 }
 
 TEST(properties_DeathTest, read_only) {
+#if defined(__BIONIC__)
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
 
   // This test only makes sense if we're talking to the real system property service.
@@ -371,6 +409,7 @@
   }
 
   ASSERT_EXIT(__system_property_add("property", 8, "value", 5), KilledByFault(), "");
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-
-#endif
diff --git a/tests/time_test.cpp b/tests/time_test.cpp
index fb5a4a7..869ee4b 100644
--- a/tests/time_test.cpp
+++ b/tests/time_test.cpp
@@ -20,9 +20,12 @@
 
 #include <time.h>
 
-#ifdef __BIONIC__ // mktime_tz is a bionic extension.
+#if defined(__BIONIC__) // mktime_tz is a bionic extension.
 #include <libc/private/bionic_time.h>
+#endif // __BIONIC__
+
 TEST(time, mktime_tz) {
+#if defined(__BIONIC__)
   struct tm epoch;
   memset(&epoch, 0, sizeof(tm));
   epoch.tm_year = 1970 - 1900;
@@ -40,8 +43,10 @@
 
   // Missing. Falls back to UTC.
   ASSERT_EQ(2678400, mktime_tz(&epoch, "PST"));
+#else // __BIONIC__
+  GTEST_LOG_(INFO) << "This test does nothing.\n";
+#endif // __BIONIC__
 }
-#endif
 
 TEST(time, gmtime) {
   time_t t = 0;
@@ -55,7 +60,6 @@
   ASSERT_EQ(1970, broken_down->tm_year + 1900);
 }
 
-#if __BIONIC__
 TEST(time, mktime_10310929) {
   struct tm t;
   memset(&t, 0, sizeof(tm));
@@ -66,7 +70,9 @@
 #if !defined(__LP64__)
   // 32-bit bionic stupidly had a signed 32-bit time_t.
   ASSERT_EQ(-1, mktime(&t));
+#if defined(__BIONIC__)
   ASSERT_EQ(-1, mktime_tz(&t, "UTC"));
+#endif
 #else
   // Everyone else should be using a signed 64-bit time_t.
   ASSERT_GE(sizeof(time_t) * 8, 64U);
@@ -74,12 +80,15 @@
   setenv("TZ", "America/Los_Angeles", 1);
   tzset();
   ASSERT_EQ(static_cast<time_t>(4108348800U), mktime(&t));
+#if defined(__BIONIC__)
   ASSERT_EQ(static_cast<time_t>(4108320000U), mktime_tz(&t, "UTC"));
+#endif
 
   setenv("TZ", "UTC", 1);
   tzset();
   ASSERT_EQ(static_cast<time_t>(4108320000U), mktime(&t));
+#if defined(__BIONIC__)
   ASSERT_EQ(static_cast<time_t>(4108348800U), mktime_tz(&t, "America/Los_Angeles"));
 #endif
-}
 #endif
+}