Bug 1321750 - Remove automatic color flags from HOST_CFLAGS, HOST_CXXFLAGS; r?glandium moz.configure only sets the color flags value for the target compiler. If the host compiler is a different version and doesn't support color flags, we may pass unrecognized command line options. Until we have better distinction between host and target compilers throughout the build system, just disable automatic color flags for host invocations. We don't have too many host binaries, so this should have negligible impact. MozReview-Commit-ID: KWTLkKvtwHs

--- a/config/config.mk
+++ b/config/config.mk
@@ -349,18 +349,16 @@ ifeq (,$(filter $(COLOR_CFLAGS:-f%=-fno-
 endif
 endef
 
 color_flags_vars := \
   COMPILE_CFLAGS \
   COMPILE_CXXFLAGS \
   COMPILE_CMFLAGS \
   COMPILE_CMMFLAGS \
-  HOST_CFLAGS \
-  HOST_CXXFLAGS \
   LDFLAGS \
   $(NULL)
 
 ifdef MACH_STDOUT_ISATTY
 ifdef COLOR_CFLAGS
 # TODO Bug 1319166 - iTerm2 interprets some bytes  sequences as a
 # request to show a print dialog. Don't enable color on iTerm2 until
 # a workaround is in place.