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H A DMakefilediff 805b2e1d Sat Feb 27 23:10:28 MST 2021 Masahiro Yamada <masahiroy@kernel.org> kbuild: include Makefile.compiler only when compiler is needed

Since commit f2f02ebd8f38 ("kbuild: improve cc-option to clean up all
temporary files"), running 'make kernelversion' in a read-only source
tree emits a bunch of warnings:

mkdir: cannot create directory '.tmp_12345': Permission denied

No-build targets such as kernelversion, clean, help, etc. do not
need to evaluate $(call cc-option,) or friends. Skip Makefile.compiler
so $(call cc-option,) becomes no-op.

This not only fixes the warnings, but also runs non-build targets much
faster.

Basically, all installation targets should also be non-build targets.
Unfortunately, vdso_install requires the compiler because it builds
vdso before installation. This is a problem that must be fixed by a
separate patch.

Reported-by: Israel Tsadok <itsadok@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff 805b2e1d Sat Feb 27 23:10:28 MST 2021 Masahiro Yamada <masahiroy@kernel.org> kbuild: include Makefile.compiler only when compiler is needed

Since commit f2f02ebd8f38 ("kbuild: improve cc-option to clean up all
temporary files"), running 'make kernelversion' in a read-only source
tree emits a bunch of warnings:

mkdir: cannot create directory '.tmp_12345': Permission denied

No-build targets such as kernelversion, clean, help, etc. do not
need to evaluate $(call cc-option,) or friends. Skip Makefile.compiler
so $(call cc-option,) becomes no-op.

This not only fixes the warnings, but also runs non-build targets much
faster.

Basically, all installation targets should also be non-build targets.
Unfortunately, vdso_install requires the compiler because it builds
vdso before installation. This is a problem that must be fixed by a
separate patch.

Reported-by: Israel Tsadok <itsadok@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff 805a6af8 Wed Jan 04 16:55:44 MST 2012 Linus Torvalds <torvalds@linux-foundation.org> Linux 3.2

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