linux-kernel - [PATCH] kbuild: uapi: reuse KBUILD

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Message-Id: <20251014-kbuild-uapi-usercflags-v1-1-c162f9059c47@linutronix.de>
Date: Tue, 14 Oct 2025 07:55:32 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH] kbuild: uapi: reuse KBUILD_USERCFLAGS

The toplevel Makefile already provides the compiler flags necessary to
build userspace applications for the target.

Make use of them instead of duplicating the logic.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 usr/include/Makefile | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/usr/include/Makefile b/usr/include/Makefile
index 61a7dd4fc05f004d785c64c0019ad846c84719d5..d8a508042fed315401ed689e0839af249c4b31c8 100644
--- a/usr/include/Makefile
+++ b/usr/include/Makefile
@@ -6,16 +6,9 @@
 #
 # -std=c90 (equivalent to -ansi) catches the violation of those.
 # We cannot go as far as adding -Wpedantic since it emits too many warnings.
-UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration
+UAPI_CFLAGS := -std=c90 -Werror=implicit-function-declaration
 
-# In theory, we do not care -m32 or -m64 for header compile tests.
-# It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
-UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
-
-# USERCFLAGS might contain sysroot location for CC.
-UAPI_CFLAGS += $(USERCFLAGS)
-
-override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include
+override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include
 
 # The following are excluded for now because they fail to build.
 #

---
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
change-id: 20251013-kbuild-uapi-usercflags-affb222af087

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>