kbuild: uapi: use -fsyntax-only rather than -S

The UAPI header tests are checking that the generated headers do not
have syntax errors. There's no need to run the rest of the compilation
pipeline after semantic analysis has run. Replace -S -o /dev/null with
-fsyntax-only.

Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/usr/include/Makefile b/usr/include/Makefile
index fa9819e..f621e60 100644 (file)
--- a/usr/include/Makefile
+++ b/usr/include/Makefile
@@ -92,7 +92,7 @@ always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/
 # Include the header twice to detect missing include guard.
 quiet_cmd_hdrtest = HDRTEST $<
       cmd_hdrtest = \
-               $(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
+               $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
                        $(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
                $(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<; \
                touch $@