Add "WITH_SYNTAX_CHECK=1 make ..."
The new option WITH_SYNTAX_CHECK=1 instructs build system to invoke
"clang -fsyntax-only" to utilize clang's better diagnostics before calling
LOCAL_CC/LOCAL_CXX for code generation. The compilation time is slightly
longer, and the generated object file should be the same as w/o WITH_SYNTAX_CHECK
Project use lots of GCC extensions (eg. nested function) not supported
by clang may opt out by adding LOCAL_NO_SYNTAX_CHECK:=true
Change-Id: Iaeedd07d5719f9df9675ab57e307e28a9c855c1b
diff --git a/core/config.mk b/core/config.mk
index 024e7f5..bdbf585 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -267,6 +267,15 @@
TARGET_TOOLCHAIN_ROOT := $(wildcard $(TARGET_TOOLCHAIN_ROOT))
endif
+# Disable WITH_SYNTAX_CHECK if tool can't be found
+SYNTAX_TOOLS_PREFIX := prebuilts/clang/$(HOST_PREBUILT_TAG)/host/3.3/bin
+ifneq ($(strip $(WITH_SYNTAX_CHECK)),)
+ ifeq ($(wildcard $(SYNTAX_TOOLS_PREFIX)/ccc-syntax),)
+ $(warning *** Disable WITH_SYNTAX_CHECK because $(SYNTAX_TOOLS_PREFIX)/ccc-syntax does not exist)
+ WITH_SYNTAX_CHECK :=
+ endif
+endif
+
# Pick a Java compiler.
include $(BUILD_SYSTEM)/combo/javac.mk