adjust clang plugins for srcdir != builddir

Change-Id: Ie4c934b52c4b010703e91f84b83e1fe590b5d187

compilerplugins/Makefile-clang.mk

@@ -37,7 +37,7 @@ CLANGINCLUDES=-I$(CLANGDIR)/include -I$(CLANGDIR)/tools/clang/include -I$(CLANGB
 CLANGINDIR=$(SRCDIR)/compilerplugins/clang
 # Cannot use $(WORKDIR), the plugin should survive even 'make clean', otherwise the rebuilt
 # plugin will cause cache misses with ccache.
-CLANGOUTDIR=$(SRCDIR)/compilerplugins/obj
+CLANGOUTDIR=$(BUILDDIR)/compilerplugins/obj
 
 compilerplugins: $(CLANGOUTDIR) $(CLANGOUTDIR)/plugin.so
 
@@ -63,7 +63,7 @@ endef
 $(foreach src, $(CLANGSRC), $(eval $(call clangbuildsrc,$(src),$(CLANGINDIR)/$(src),$(CLANGOUTDIR)/$(src:.cxx=.o))))
 
 $(CLANGOUTDIR)/plugin.so: $(CLANGOBJS)
-	@echo [build LNK] $(subst $(SRCDIR)/,,$@)
+	@echo [build LNK] $(subst $(BUILDDIR)/,,$@)
 	$(CXX) -shared $(CLANGOBJS) -o $@
 
 # Clang most probably doesn't maintain binary compatibility, so rebuild when clang changes.

solenv/gbuild/platform/com_GCC_defs.mk

@@ -161,9 +161,9 @@ gb_LinkTarget_INCLUDE :=\
 
 ifeq ($(COM_GCC_IS_CLANG),TRUE)
 ifeq ($(COMPILER_PLUGIN_TOOL),)
-gb_COMPILER_PLUGINS := -Xclang -load -Xclang $(SRCDIR)/compilerplugins/obj/plugin.so -Xclang -add-plugin -Xclang loplugin
+gb_COMPILER_PLUGINS := -Xclang -load -Xclang $(BUILDDIR)/compilerplugins/obj/plugin.so -Xclang -add-plugin -Xclang loplugin
 else
-gb_COMPILER_PLUGINS := -Xclang -load -Xclang $(SRCDIR)/compilerplugins/obj/plugin.so -Xclang -plugin -Xclang loplugin -Xclang -plugin-arg-loplugin -Xclang $(COMPILER_PLUGIN_TOOL)
+gb_COMPILER_PLUGINS := -Xclang -load -Xclang $(BUILDDIR)/compilerplugins/obj/plugin.so -Xclang -plugin -Xclang loplugin -Xclang -plugin-arg-loplugin -Xclang $(COMPILER_PLUGIN_TOOL)
 endif
 # extra EF variable to make the command line shorter (just like is done with $(SRCDIR) etc.)
 gb_COMPILER_PLUGINS_SETUP := EF=$(SRCDIR)/sal/inc/sal/log-areas.dox && ICECC_EXTRAFILES=$$EF CCACHE_EXTRAFILES=$$EF