diff --git a/core/clang/HOST_CROSS_x86.mk b/core/clang/HOST_CROSS_x86.mk
index b78a074..c67825b 100644
--- a/core/clang/HOST_CROSS_x86.mk
+++ b/core/clang/HOST_CROSS_x86.mk
@@ -27,8 +27,7 @@
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_HOST_CROSS_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_x86_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_CPPFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_CROSS_TRIPLE)
+  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_CPPFLAGS)
 
 CLANG_CONFIG_x86_HOST_CROSS_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
diff --git a/core/clang/HOST_CROSS_x86_64.mk b/core/clang/HOST_CROSS_x86_64.mk
index b6f2de9..cdf49a9 100644
--- a/core/clang/HOST_CROSS_x86_64.mk
+++ b/core/clang/HOST_CROSS_x86_64.mk
@@ -27,8 +27,7 @@
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_HOST_CROSS_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_x86_64_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_CPPFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_CROSS_TRIPLE)
+  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_CPPFLAGS)
 
 CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
diff --git a/core/clang/HOST_x86.mk b/core/clang/HOST_x86.mk
index 0ec64ad..a2015f1 100644
--- a/core/clang/HOST_x86.mk
+++ b/core/clang/HOST_x86.mk
@@ -41,8 +41,7 @@
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_x86_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_TRIPLE)
+  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS)
 
 CLANG_CONFIG_x86_HOST_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
diff --git a/core/clang/HOST_x86_64.mk b/core/clang/HOST_x86_64.mk
index d46cb67..b2f83f7 100644
--- a/core/clang/HOST_x86_64.mk
+++ b/core/clang/HOST_x86_64.mk
@@ -41,8 +41,7 @@
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_HOST_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_x86_64_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE)
+  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS)
 
 CLANG_CONFIG_x86_64_HOST_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
diff --git a/core/clang/HOST_x86_common.mk b/core/clang/HOST_x86_common.mk
index 1344eae..7333297 100644
--- a/core/clang/HOST_x86_common.mk
+++ b/core/clang/HOST_x86_common.mk
@@ -23,8 +23,6 @@
 
 ifneq ($(strip $($(clang_2nd_arch_prefix)HOST_IS_64_BIT)),)
 CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS := \
-  --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG) \
-  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
   -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8 \
   -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/x86_64-linux \
   -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/backward
@@ -38,8 +36,6 @@
   -L$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/lib64
 else
 CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS := \
-  --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG) \
-  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
   -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8 \
   -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/x86_64-linux/32 \
   -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/backward
diff --git a/core/clang/TARGET_arm.mk b/core/clang/TARGET_arm.mk
index 5c1bf6f..906e677 100644
--- a/core/clang/TARGET_arm.mk
+++ b/core/clang/TARGET_arm.mk
@@ -27,8 +27,7 @@
 CLANG_CONFIG_arm_TARGET_EXTRA_CPPFLAGS := \
   $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
   $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_arm_EXTRA_CPPFLAGS) \
-  -target $(CLANG_CONFIG_arm_TARGET_TRIPLE)
+  $(CLANG_CONFIG_arm_EXTRA_CPPFLAGS)
 
 CLANG_CONFIG_arm_TARGET_EXTRA_LDFLAGS := \
   $(CLANG_CONFIG_EXTRA_LDFLAGS) \
diff --git a/core/clang/config.mk b/core/clang/config.mk
index 1584926..7b4821a 100644
--- a/core/clang/config.mk
+++ b/core/clang/config.mk
@@ -106,7 +106,7 @@
 # Clang flags for all target rules
 CLANG_CONFIG_TARGET_EXTRA_ASFLAGS :=
 CLANG_CONFIG_TARGET_EXTRA_CFLAGS := -nostdlibinc
-CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS := -nostdlibinc
+CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS :=
 CLANG_CONFIG_TARGET_EXTRA_LDFLAGS :=
 
 CLANG_DEFAULT_UB_CHECKS := \