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build: do not set CCACHE_COMPILERCHECK

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Stop overriding CCACHE_COMPILERCHECK from rules.mk and rely on
ccache's default, which hashes the compiler binary's mtime and
size.

For a local tree that is enough: the toolchain only changes when
it is rebuilt, and a rebuild updates mtime and size. Users who
want a stricter check can still set CCACHE_COMPILERCHECK in their
environment.

CI does not depend on this export either. The workflow writes a
secondary ccache.conf with

  compiler_check=string:<toolchain-commit-sha>

so the cache key is tied to the toolchain source revision. That
is both stricter than the previous "%compiler% -v -c" setting
and portable across runners, where compiler mtimes would not
match after restoring a cache archive.

Link: https://github.com/openwrt/openwrt/pull/22995
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 3956287514e5457723070f4b8bc7ed8084019d39)
(cherry picked from commit a6149ff867c92daa1aaa050b27ba8c6053d7cfe0)
This commit is contained in:
Hauke Mehrtens 2026-04-18 19:47:01 +02:00 committed by ahmed sassi
parent a50030d5ce
commit cb1db708e1
1 changed files with 0 additions and 1 deletions
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rules.mk
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@ -344,7 +344,6 @@ ifneq ($(CONFIG_CCACHE),)
HOSTCXX:= ccache $(HOSTCXX) HOSTCXX:= ccache $(HOSTCXX)
export CCACHE_BASEDIR:=$(TOPDIR) export CCACHE_BASEDIR:=$(TOPDIR)
export CCACHE_DIR:=$(if $(call qstrip,$(CONFIG_CCACHE_DIR)),$(call qstrip,$(CONFIG_CCACHE_DIR)),$(TOPDIR)/.ccache) export CCACHE_DIR:=$(if $(call qstrip,$(CONFIG_CCACHE_DIR)),$(call qstrip,$(CONFIG_CCACHE_DIR)),$(TOPDIR)/.ccache)
export CCACHE_COMPILERCHECK:=%compiler% -v -c
endif endif
TARGET_CONFIGURE_OPTS = \ TARGET_CONFIGURE_OPTS = \