5.15-stable review patch. If anyone has any objections, please let me know.

------------------

From: Nick Desaulniers ndesaulniers@google.com

commit 88b61e3bff93f99712718db785b4aa0c1165f35c upstream.

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_wr... 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 [nathan: Backport to 5.15 and eliminate instances of cc-ifversion that did not exist upstream when this change was original created] Signed-off-by: Nathan Chancellor nathan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Documentation/kbuild/makefiles.rst | 29 ++++++++++++++----------- Makefile | 6 +---- arch/mips/loongson64/Platform | 2 - arch/s390/Makefile | 4 +-- drivers/gpu/drm/amd/display/dc/dcn20/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dcn21/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dcn30/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dcn301/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dcn302/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dcn303/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dcn31/Makefile | 2 - drivers/gpu/drm/amd/display/dc/dml/Makefile | 2 - scripts/Makefile.compiler | 10 ++++++-- 13 files changed, 37 insertions(+), 30 deletions(-)

--- 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 $(CC) in path with --- a/Makefile +++ b/Makefile @@ -804,7 +804,6 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STR KBUILD_CFLAGS += $(stackp-flags-y)

KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror -KBUILD_CFLAGS += $(KBUILD_CFLAGS-y)

ifdef CONFIG_CC_IS_CLANG KBUILD_CPPFLAGS += -Qunused-arguments @@ -1043,7 +1042,6 @@ 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 @@ -1055,8 +1053,8 @@ 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)

# disable invalid "can't wrap" optimizations for signed / pointers KBUILD_CFLAGS += -fno-strict-overflow --- a/arch/mips/loongson64/Platform +++ b/arch/mips/loongson64/Platform @@ -12,7 +12,7 @@ cflags-$(CONFIG_CPU_LOONGSON64) += -Wa,- # by GAS. The cc-option can't probe for this behaviour so -march=loongson3a # can't easily be used safely within the kbuild framework. # -ifeq ($(call cc-ifversion, -ge, 0409, y), y) +ifeq ($(call gcc-min-version, 40900), y) ifeq ($(call ld-ifversion, -ge, 22500, y), y) cflags-$(CONFIG_CPU_LOONGSON64) += \ $(call cc-option,-march=loongson3a -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) --- a/arch/s390/Makefile +++ b/arch/s390/Makefile @@ -35,8 +35,8 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CON KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))

ifdef CONFIG_CC_IS_GCC - ifeq ($(call cc-ifversion, -ge, 1200, y), y) - ifeq ($(call cc-ifversion, -lt, 1300, y), y) + ifeq ($(call gcc-min-version, 120000), y) + ifneq ($(call gcc-min-version, 130000), y) KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds) endif --- a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile @@ -18,7 +18,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_reso 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 --- a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile @@ -14,7 +14,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_reso 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 --- a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile @@ -42,7 +42,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc 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 CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o += -mhard-float --- a/drivers/gpu/drm/amd/display/dc/dcn301/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn301/Makefile @@ -22,7 +22,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn301/dcn301_re 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 CFLAGS_$(AMDDALPATH)/dc/dcn301/dcn301_resource.o += -mhard-float --- a/drivers/gpu/drm/amd/display/dc/dcn302/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn302/Makefile @@ -21,7 +21,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn302/dcn302_re 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 CFLAGS_$(AMDDALPATH)/dc/dcn302/dcn302_resource.o += -mhard-float --- a/drivers/gpu/drm/amd/display/dc/dcn303/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn303/Makefile @@ -17,7 +17,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn303/dcn303_re 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 CFLAGS_$(AMDDALPATH)/dc/dcn303/dcn303_resource.o += -mhard-float --- a/drivers/gpu/drm/amd/display/dc/dcn31/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dcn31/Makefile @@ -22,7 +22,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn31/dcn31_reso 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 CFLAGS_$(AMDDALPATH)/dc/dcn31/dcn31_resource.o += -mhard-float --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile @@ -35,7 +35,7 @@ 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 --- 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)