linux-hardening - [RFC PATCH 06/11] kbuild: set $dry_run when running in --dry-run mode

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Message-Id: <20240819160309.2218114-7-vegard.nossum@oracle.com>
Date: Mon, 19 Aug 2024 18:03:03 +0200
From: Vegard Nossum <vegard.nossum@...cle.com>
To: Masahiro Yamada <masahiroy@...nel.org>, linux-kbuild@...r.kernel.org
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Morten Linderud <morten@...derud.pw>,
        Haelwenn Monnier <contact@...odan.eu>, Jann Horn <jannh@...gle.com>,
        Kees Cook <kees@...nel.org>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Theodore Ts'o <tytso@....edu>, linux-hardening@...r.kernel.org,
        Vegard Nossum <vegard.nossum@...cle.com>
Subject: [RFC PATCH 06/11] kbuild: set $dry_run when running in --dry-run mode

Add a convenience variable that allows us to use 'ifdef dry_run...endif'
in Makefiles or '[ -v dry_run ]' in shell scripts to test whether make
was invoked with '-n'.

See [1] for an explanation of this particular construction.

[1]: https://www.gnu.org/software/make/manual/make.html#Testing-Flags

Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile b/Makefile
index 58f3843ccfac6..953951157ec92 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,11 @@ $(if $(filter __%, $(MAKECMDGOALS)), \
 PHONY := __all
 __all:
 
+# Was make invoked with --dry-run/-n? Record this in a convenience variable.
+ifeq (n,$(findstring n,$(firstword -$(MAKEFLAGS))))
+export dry_run := 1
+endif
+
 # We are using a recursive build, so we need to do a little thinking
 # to get the ordering right.
 #
-- 
2.34.1