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authorNick Desaulniers <ndesaulniers@google.com>2022-09-19 20:08:28 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2022-09-28 22:40:16 +0300
commit88b61e3bff93f99712718db785b4aa0c1165f35c (patch)
tree6a77ccf3bfdbe1f146c02a77dcdbcaf1463c1f40 /Documentation/kbuild
parent2e07005f4813a9ff6e895787e0c2d1fea859b033 (diff)
downloadlinux-88b61e3bff93f99712718db785b4aa0c1165f35c.tar.xz
Makefile.compiler: replace cc-ifversion with compiler-specific macros
cc-ifversion is GCC specific. Replace it with compiler specific variants. Update the users of cc-ifversion to use these new macros. Link: https://github.com/ClangBuiltLinux/linux/issues/350 Link: https://lore.kernel.org/llvm/CAGG=3QWSAUakO42kubrCap8fp-gm1ERJJAYXTnP1iHk_wrH=BQ@mail.gmail.com/ Suggested-by: Bill Wendling <morbo@google.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Documentation/kbuild')
-rw-r--r--Documentation/kbuild/makefiles.rst29
1 files changed, 17 insertions, 12 deletions
diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index 11a296e52d68..ee7e3ea1fbe1 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -682,22 +682,27 @@ more details, with real examples.
In the above example, -Wno-unused-but-set-variable will be added to
KBUILD_CFLAGS only if gcc really accepts it.
- cc-ifversion
- cc-ifversion tests the version of $(CC) and equals the fourth parameter
- if version expression is true, or the fifth (if given) if the version
- expression is false.
+ gcc-min-version
+ gcc-min-version tests if the value of $(CONFIG_GCC_VERSION) is greater than
+ or equal to the provided value and evaluates to y if so.
Example::
- #fs/reiserfs/Makefile
- ccflags-y := $(call cc-ifversion, -lt, 0402, -O1)
+ cflags-$(call gcc-min-version, 70100) := -foo
- In this example, ccflags-y will be assigned the value -O1 if the
- $(CC) version is less than 4.2.
- cc-ifversion takes all the shell operators:
- -eq, -ne, -lt, -le, -gt, and -ge
- The third parameter may be a text as in this example, but it may also
- be an expanded variable or a macro.
+ In this example, cflags-y will be assigned the value -foo if $(CC) is gcc and
+ $(CONFIG_GCC_VERSION) is >= 7.1.
+
+ clang-min-version
+ clang-min-version tests if the value of $(CONFIG_CLANG_VERSION) is greater
+ than or equal to the provided value and evaluates to y if so.
+
+ Example::
+
+ cflags-$(call clang-min-version, 110000) := -foo
+
+ In this example, cflags-y will be assigned the value -foo if $(CC) is clang
+ and $(CONFIG_CLANG_VERSION) is >= 11.0.0.
cc-cross-prefix
cc-cross-prefix is used to check if there exists a $(CC) in path with