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: dee2b70 ("kconfig: Add support for -Wimplicit-fallthrough") Reported-by: Nathan Chancellor <[email protected]> Co-developed-by: Nathan Chancellor <[email protected]> Signed-off-by: Nathan Chancellor <[email protected]> Signed-off-by: Gustavo A. R. Silva <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
wafgo · Nov 15, 2021 · 158ea2d · 158ea2d
1 parent fa55b7d
commit 158ea2d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/init/Kconfig b/init/Kconfig
@@ -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)
 
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