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Peter Anvin" , Ingo Molnar , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , Palmer Dabbelt , Paul Walmsley , Thomas Gleixner , Tom Rix , linux-riscv@lists.infradead.org, llvm@lists.linux.dev, x86@kernel.org Subject: [PATCH] kbuild: add test-{ge,gt,le,lt} macros Date: Sun, 11 Dec 2022 11:46:47 +0900 Message-Id: <20221211024647.2614394-1-masahiroy@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751884543390318008?= X-GMAIL-MSGID: =?utf-8?q?1751884543390318008?= GNU Make 4.4 introduced $(intcmp ...), which is useful to compare two integers without forking a new process. Add test-{ge,gt,le,lt} macros, which work more efficiently with GNU Make >= 4.4. For older Make versions, they fall back to the 'test' shell command. The first two parameters to $(intcmp ...) must not be empty. To avoid the syntax error, I appended '0' to them. Fortunately, '00' is treated as '0'. This is needed because CONFIG options may expand to an empty string when the kernel configuration is not included. Signed-off-by: Masahiro Yamada Acked-by: Palmer Dabbelt # RISC-V Reviewed-by: Nathan Chancellor Reviewed-by: Nicolas Schier --- Changes in v3: - Use $(intcmp ...) instead of playing with $(sort ...) Makefile | 2 +- arch/riscv/Makefile | 2 +- arch/x86/Makefile | 2 +- scripts/Kbuild.include | 16 ++++++++++++++++ scripts/Makefile.compiler | 4 ++-- 5 files changed, 21 insertions(+), 5 deletions(-) diff --git a/Makefile b/Makefile index fbd9ff4a61e7..8801cac4d3d5 100644 --- a/Makefile +++ b/Makefile @@ -993,7 +993,7 @@ KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 # Check for frame size exceeding threshold during prolog/epilog insertion # when using lld < 13.0.0. ifneq ($(CONFIG_FRAME_WARN),0) -ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) +ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) endif endif diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 0d13b597cb55..faf2c2177094 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -37,7 +37,7 @@ else endif ifeq ($(CONFIG_LD_IS_LLD),y) -ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0) +ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y) KBUILD_CFLAGS += -mno-relax KBUILD_AFLAGS += -mno-relax ifndef CONFIG_AS_IS_LLVM diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 415a5d138de4..e72c7a49cd59 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -211,7 +211,7 @@ endif KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE) ifdef CONFIG_LTO_CLANG -ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) +ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) KBUILD_LDFLAGS += -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8) endif endif diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index cbe28744637b..5019bc1e38e4 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -11,6 +11,22 @@ space := $(empty) $(empty) space_escape := _-_SPACE_-_ pound := \# +### +# Comparison macros. +# Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000) +# +# Use $(intcmp ...) if supported. (Make >= 4.4) +# Otherwise, fall back to the 'test' shell command. +ifeq ($(intcmp 1,0,,,y),y) +test-le = $(intcmp $(strip $1)0, $(strip $2)0,y,y,) +test-lt = $(intcmp $(strip $1)0, $(strip $2)0,y,,) +else +test-le = $(shell test $(strip $1)0 -le $(strip $2)0 && echo y) +test-lt = $(shell test $(strip $1)0 -lt $(strip $2)0 && echo y) +endif +test-ge = $(call test-le, $2, $1) +test-gt = $(call test-lt, $2, $1) + ### # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o dot-target = $(dir $@).$(notdir $@) diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler index 20d353dcabfb..3d8adfd34af1 100644 --- a/scripts/Makefile.compiler +++ b/scripts/Makefile.compiler @@ -63,11 +63,11 @@ cc-disable-warning = $(call try-run,\ # gcc-min-version # Usage: cflags-$(call gcc-min-version, 70100) += -foo -gcc-min-version = $(shell [ $(CONFIG_GCC_VERSION)0 -ge $(1)0 ] && echo y) +gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1) # clang-min-version # Usage: cflags-$(call clang-min-version, 110000) += -foo -clang-min-version = $(shell [ $(CONFIG_CLANG_VERSION)0 -ge $(1)0 ] && echo y) +clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1) # ld-option # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)