Received-SPF: pass (google.com: domain of linux-kernel+bounces-100408-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= <thomas.weissschuh@linutronix.de>
Date: Tue, 12 Mar 2024 16:03:29 +0100
Subject: [PATCH 1/2] kbuild: add host-cc-option helper
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Message-Id: <20240312-gcc-plugins-gmp-v1-1-c5e082437b9e@linutronix.de>
References: <20240312-gcc-plugins-gmp-v1-0-c5e082437b9e@linutronix.de>
In-Reply-To: <20240312-gcc-plugins-gmp-v1-0-c5e082437b9e@linutronix.de>
To: Kees Cook <keescook@chromium.org>, 
 Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-kbuild@vger.kernel.org, 
 =?utf-8?q?Thomas_Wei=C3=9Fschuh?= <thomas.weissschuh@linutronix.de>

This helper works the same as cc-option but for the host compiler.
It will be used by the gcc-plugins configuration to check for the gmp.h
header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 scripts/Kconfig.include | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index 3ee8ecfb8c04..84368e23b072 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -27,6 +27,10 @@ failure = $(if-success,$(1),n,y)
 # Return y if the compiler supports <flag>, n otherwise
 cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
 
+# $(host-cc-option,<flag>)
+# Return y if the host compiler supports <flag>, n otherwise
+host-cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(HOSTCC) -Werror $(HOSTCFLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
+
 # $(ld-option,<flag>)
 # Return y if the linker supports <flag>, n otherwise
 ld-option = $(success,$(LD) -v $(1))

-- 
2.44.0