linux-hardening - [RFC PATCH 07/11] kbuild: define 'make' as a no-op in --dry-run mode

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Message-Id: <20240819160309.2218114-8-vegard.nossum@oracle.com>
Date: Mon, 19 Aug 2024 18:03:04 +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 07/11] kbuild: define 'make' as a no-op in --dry-run mode

Output 'make() { :; }' at the start of the script in order to make
all 'make' invocations in the resulting build script no-ops (GNU Make
will actually execute -- and print -- all recipe lines that include
$(MAKE), even when invoked with -n).

Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
---
 Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Makefile b/Makefile
index 953951157ec92..d08ade5791c2e 100644
--- a/Makefile
+++ b/Makefile
@@ -226,6 +226,12 @@ $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 
 # Invoke a second make in the output directory, passing relevant variables
 __sub-make:
+ifdef dry_run
+	# define 'make' as a no-op alias so that those commands are not
+	# actually run
+	@make() { :; }
+	@export -f make
+endif
 	$(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
 	-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 
-- 
2.34.1