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kbuild: Never respect CONFIG_WERROR / W=e to fixdep 

The fixdep hostprog may be built multiple times during a single build.
Once during the configuration phase and later during the regular phase.
As only the regular build phase respects CONFIG_WERROR / W=e, the
compiler flags might change between the phases, leading to rebuilds.

Example, the rebuilds will happen twice on each invocation of the build:

  $ make allyesconfig prepare
  make[1]: Entering directory '/tmp/deleteme'
    HOSTCC  scripts/basic/fixdep
  #
  # No change to .config
  #
    HOSTCC  scripts/basic/fixdep
    DESCEND objtool
    INSTALL libsubcmd_headers
  make[1]: Leaving directory '/tmp/deleteme'

Fix the compilation flags used for scripts/basic/ before
scripts/Makefile.warn is evaluated to stop CONFIG_WERROR / W=e
influencing the fixdep build to avoid the spurious rebuilds.

Fixes: 7ded7d37e5 ("scripts/Makefile.extrawarn: Respect CONFIG_WERROR / W=e for hostprogs")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260422-kbuild-scripts-basic-werror-v1-1-8c6912ff22e0@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
master
Thomas Weißschuh 2026-04-22 17:10:27 +02:00 committed by Nicolas Schier
parent 2452dcf4d7
commit 75f7c47ccd
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1 changed files with 2 additions and 0 deletions
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@ -655,6 +655,8 @@ export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
# Basic helpers built in scripts/basic/
PHONY += scripts_basic
scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS)
scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS)
scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic