From: Nathan Chancellor <nathan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org, Ben Hutchings <ben@decadent.org.uk>,
Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH 5.15] Makefile.compiler: replace cc-ifversion with compiler-specific macros
Date: Tue, 4 Nov 2025 11:14:46 -0700 [thread overview]
Message-ID: <20251104181446.3262126-1-nathan@kernel.org> (raw)
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_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>
[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>
---
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 +-
.../gpu/drm/amd/display/dc/dcn301/Makefile | 2 +-
.../gpu/drm/amd/display/dc/dcn302/Makefile | 2 +-
.../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(-)
diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index db3af0b45baf..19a1fcc7894a 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 $(CC) in path with
diff --git a/Makefile b/Makefile
index 09bb1b22cd26..3589269e63a2 100644
--- a/Makefile
+++ b/Makefile
@@ -804,7 +804,6 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
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 += $(KBUILD_CFLAGS-y)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += -fno-strict-overflow
diff --git a/arch/mips/loongson64/Platform b/arch/mips/loongson64/Platform
index 3e660d6d3c2b..2335b697beeb 100644
--- a/arch/mips/loongson64/Platform
+++ b/arch/mips/loongson64/Platform
@@ -12,7 +12,7 @@ cflags-$(CONFIG_CPU_LOONGSON64) += -Wa,--trap
# 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)
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index c8071eb82e2e..19c618979ce7 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -35,8 +35,8 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
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 += $(call cc-disable-warning, array-bounds)
endif
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
index 54db9af8437d..57c9a0c6e8ca 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
@@ -18,7 +18,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -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/drivers/gpu/drm/amd/display/dc/dcn21/Makefile b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
index 347d86848bac..178c4d6f61b9 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
@@ -14,7 +14,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -maltivec
endif
ifdef CONFIG_CC_IS_GCC
-ifeq ($(call cc-ifversion, -lt, 0701, y), y)
+ifneq ($(call gcc-min-version, 70100), y)
IS_OLD_GCC = 1
endif
endif
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
index dfd77b3cc84d..e0fe5bbda7de 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
@@ -42,7 +42,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -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
CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o += -mhard-float
diff --git a/drivers/gpu/drm/amd/display/dc/dcn301/Makefile b/drivers/gpu/drm/amd/display/dc/dcn301/Makefile
index 09264716d1dc..fb6bcf77bd8f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn301/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn301/Makefile
@@ -22,7 +22,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn301/dcn301_resource.o := -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
CFLAGS_$(AMDDALPATH)/dc/dcn301/dcn301_resource.o += -mhard-float
diff --git a/drivers/gpu/drm/amd/display/dc/dcn302/Makefile b/drivers/gpu/drm/amd/display/dc/dcn302/Makefile
index 101620a8867a..d157aad86cf9 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn302/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn302/Makefile
@@ -21,7 +21,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn302/dcn302_resource.o := -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
CFLAGS_$(AMDDALPATH)/dc/dcn302/dcn302_resource.o += -mhard-float
diff --git a/drivers/gpu/drm/amd/display/dc/dcn303/Makefile b/drivers/gpu/drm/amd/display/dc/dcn303/Makefile
index 6f7a1f2b49f0..129e6308c712 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn303/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn303/Makefile
@@ -17,7 +17,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn303/dcn303_resource.o := -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
CFLAGS_$(AMDDALPATH)/dc/dcn303/dcn303_resource.o += -mhard-float
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/Makefile b/drivers/gpu/drm/amd/display/dc/dcn31/Makefile
index 4bab97acb155..e3a63f82a69d 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/Makefile
@@ -22,7 +22,7 @@ CFLAGS_$(AMDDALPATH)/dc/dcn31/dcn31_resource.o := -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
CFLAGS_$(AMDDALPATH)/dc/dcn31/dcn31_resource.o += -mhard-float
diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index 36cac3839b50..d5c55926cc5b 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -35,7 +35,7 @@ dml_ccflags := -mhard-float -maltivec
endif
ifdef CONFIG_CC_IS_GCC
-ifeq ($(call cc-ifversion, -lt, 0701, y), y)
+ifneq ($(call gcc-min-version, 70100),y)
IS_OLD_GCC = 1
endif
endif
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 3eddd0ab2532..c36b201fddb1 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)
--
2.51.2
reply other threads:[~2025-11-04 18:14 UTC|newest]
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