Bug 1316545 part 4 - Run clang.exe instead of clang-cl.exe for loading the plugin. r=ehsan,glandium

MozReview-Commit-ID: K85tFo0nzoI

--HG--
extra : histedit_source : 2652e6144760cf77d10ba3b28fc73b85378ec585

config/static-checking-config.mk

@@ -6,6 +6,14 @@
 # script. Additional scripts may be added by specific subdirectories.
 
 ifdef ENABLE_CLANG_PLUGIN
+# Replace "clang-cl.exe" to "clang.exe --driver-mode=cl" to avoid loading the
+# module clang.exe again when load the plugin dll, which links to the import
+# library of clang.exe.
+ifeq ($(OS_ARCH),WINNT)
+CC := $(subst clang-cl.exe,clang.exe --driver-mode=cl,$(CC:.EXE=.exe))
+CXX := $(subst clang-cl.exe,clang.exe --driver-mode=cl,$(CXX:.EXE=.exe))
+endif
+
 CLANG_PLUGIN := $(topobjdir)/build/clang-plugin/$(DLL_PREFIX)clang-plugin$(DLL_SUFFIX)
 OS_CXXFLAGS += -Xclang -load -Xclang $(CLANG_PLUGIN) -Xclang -add-plugin -Xclang moz-check
 OS_CFLAGS += -Xclang -load -Xclang $(CLANG_PLUGIN) -Xclang -add-plugin -Xclang moz-check