linux-kernel - [PATCH] kbuild: uapi: use -fsyntax-only rather than -S

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Date:   Wed, 30 Mar 2022 11:34:06 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Dmitry V. Levin" <ldv@...linux.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...gle.com>
---
 usr/include/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usr/include/Makefile b/usr/include/Makefile
index 7b283d43f00d..bf193e205dbe 100644
--- a/usr/include/Makefile
+++ b/usr/include/Makefile
@@ -89,7 +89,7 @@ extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/d
 # 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 $@

base-commit: 74164d284b2909de0ba13518cc063e9ea9334749
-- 
2.35.1.1021.g381101b075-goog