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authorNick Desaulniers <ndesaulniers@google.com>2022-09-19 10:08:28 -0700
committerMasahiro Yamada <masahiroy@kernel.org>2022-09-29 04:40:16 +0900
commit88b61e3bff93f99712718db785b4aa0c1165f35c (patch)
tree6a77ccf3bfdbe1f146c02a77dcdbcaf1463c1f40
parent2e07005f4813a9ff6e895787e0c2d1fea859b033 (diff)
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>
-rw-r--r--Documentation/kbuild/makefiles.rst29
-rw-r--r--Makefile6
-rw-r--r--drivers/gpu/drm/amd/display/dc/dml/Makefile2
-rw-r--r--scripts/Makefile.compiler10
-rw-r--r--scripts/Makefile.extrawarn4
5 files changed, 29 insertions, 22 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
diff --git a/Makefile b/Makefile
index b0a3cba5af94..09c9d9a005bd 100644
--- a/Makefile
+++ b/Makefile
@@ -790,7 +790,6 @@ KBUILD_CFLAGS += $(stackp-flags-y)
KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
-KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
ifdef CONFIG_CC_IS_CLANG
KBUILD_CPPFLAGS += -Qunused-arguments
@@ -972,7 +971,6 @@ ifdef CONFIG_CC_IS_GCC
KBUILD_CFLAGS += -Wno-maybe-uninitialized
endif
-ifdef CONFIG_CC_IS_GCC
# The allocators already balk at large sizes, so silence the compiler
# warnings for bounds checks involving those possible values. While
# -Wno-alloc-size-larger-than would normally be used here, earlier versions
@@ -984,8 +982,8 @@ ifdef CONFIG_CC_IS_GCC
# ignored, continuing to default to PTRDIFF_MAX. So, left with no other
# choice, we must perform a versioned check to disable this warning.
# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
-KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
-endif
+KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
+KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += -fno-strict-overflow
diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index cb81ed2fbd53..d70838edba80 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -34,7 +34,7 @@ dml_ccflags := -mhard-float -maltivec
endif
ifdef CONFIG_CC_IS_GCC
-ifeq ($(call cc-ifversion, -lt, 0701, y), y)
+ifneq ($(call gcc-min-version, 70100),y)
IS_OLD_GCC = 1
endif
endif
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 94d0d40cddb3..20d353dcabfb 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -61,9 +61,13 @@ cc-option-yn = $(call try-run,\
cc-disable-warning = $(call try-run,\
$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
-# cc-ifversion
-# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
-cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
+# gcc-min-version
+# Usage: cflags-$(call gcc-min-version, 70100) += -foo
+gcc-min-version = $(shell [ $(CONFIG_GCC_VERSION)0 -ge $(1)0 ] && echo y)
+
+# clang-min-version
+# Usage: cflags-$(call clang-min-version, 110000) += -foo
+clang-min-version = $(shell [ $(CONFIG_CLANG_VERSION)0 -ge $(1)0 ] && echo y)
# ld-option
# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 6ae482158bc4..5769c1939d40 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -48,7 +48,7 @@ else
ifdef CONFIG_CC_IS_CLANG
KBUILD_CFLAGS += -Wno-initializer-overrides
# Clang before clang-16 would warn on default argument promotions.
-ifeq ($(shell [ $(CONFIG_CLANG_VERSION) -lt 160000 ] && echo y),y)
+ifneq ($(call clang-min-version, 160000),y)
# Disable -Wformat
KBUILD_CFLAGS += -Wno-format
# Then re-enable flags that were part of the -Wformat group that aren't
@@ -56,7 +56,7 @@ KBUILD_CFLAGS += -Wno-format
KBUILD_CFLAGS += -Wformat-extra-args -Wformat-invalid-specifier
KBUILD_CFLAGS += -Wformat-zero-length -Wnonnull
# Requires clang-12+.
-ifeq ($(shell [ $(CONFIG_CLANG_VERSION) -ge 120000 ] && echo y),y)
+ifeq ($(call clang-min-version, 120000),y)
KBUILD_CFLAGS += -Wformat-insufficient-args
endif
endif