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kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x 

-Wimplicit-fallthrough=5 was under cc-option because it was only
available in GCC 7.x and newer so the build is now broken for GCC 5.x
and 6.x:

gcc: error: unrecognized command line option '-Wimplicit-fallthrough=5';
did you mean '-Wno-fallthrough'?

Fix this by moving -Wimplicit-fallthrough=5 under cc-option.

Fixes: dee2b702bc ("kconfig: Add support for -Wimplicit-fallthrough")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Co-developed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gustavo A. R. Silva 2021-11-14 20:48:44 -06:00 committed by Linus Torvalds
parent fa55b7dcdc
commit 158ea2d2b2
1 changed files with 1 additions and 1 deletions
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2
init/Kconfig
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@ -887,7 +887,7 @@ config CC_HAS_INT128
config CC_IMPLICIT_FALLTHROUGH
string
default "-Wimplicit-fallthrough=5" if CC_IS_GCC
default "-Wimplicit-fallthrough=5" if CC_IS_GCC && $(cc-option,-Wimplicit-fallthrough=5)
default "-Wimplicit-fallthrough" if CC_IS_CLANG && $(cc-option,-Wunreachable-code-fallthrough)
#