diff options
| -rw-r--r-- | Makefile | 50 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 2 |
2 files changed, 33 insertions, 19 deletions
@@ -669,9 +669,10 @@ endif # KBUILD_EXTMOD # Defaults to vmlinux, but the arch makefile usually adds further targets all: vmlinux -CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ - $(call cc-option,-fno-tree-loop-im) \ - $(call cc-disable-warning,maybe-uninitialized,) +CFLAGS_GCOV := -fprofile-arcs -ftest-coverage +ifdef CONFIG_CC_IS_GCC +CFLAGS_GCOV += -fno-tree-loop-im +endif export CFLAGS_GCOV # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. @@ -679,12 +680,14 @@ ifdef CONFIG_FUNCTION_TRACER CC_FLAGS_FTRACE := -pg endif -RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register -RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register -RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk -RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline -RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) -RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) +ifdef CONFIG_CC_IS_GCC +RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) +RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) +endif +ifdef CONFIG_CC_IS_CLANG +RETPOLINE_CFLAGS := -mretpoline-external-thunk +RETPOLINE_VDSO_CFLAGS := -mretpoline +endif export RETPOLINE_CFLAGS export RETPOLINE_VDSO_CFLAGS @@ -737,7 +740,7 @@ include/config/auto.conf: endif # may-sync-config endif # need-config -KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) +KBUILD_CFLAGS += -fno-delete-null-pointer-checks KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) @@ -752,17 +755,19 @@ KBUILD_CFLAGS += -Os endif # Tell gcc to never replace conditional load with a non-conditional one +ifdef CONFIG_CC_IS_GCC +# gcc-10 renamed --param=allow-store-data-races=0 to +# -fno-allow-store-data-races. KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) +endif ifdef CONFIG_READABLE_ASM # Disable optimizations that make assembler listings hard to read. # reorder blocks reorders the control in the function # ipa clone creates specialized cloned functions # partial inlining inlines only parts of functions -KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ - $(call cc-option,-fno-ipa-cp-clone,) \ - $(call cc-option,-fno-partial-inlining) +KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining endif ifneq ($(CONFIG_FRAME_WARN),0) @@ -854,8 +859,10 @@ DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) endif ifdef CONFIG_DEBUG_INFO_REDUCED -DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ - $(call cc-option,-fno-var-tracking) +DEBUG_CFLAGS += -fno-var-tracking +ifdef CONFIG_CC_IS_GCC +DEBUG_CFLAGS += -femit-struct-debug-baseonly +endif endif ifdef CONFIG_DEBUG_INFO_COMPRESSED @@ -889,6 +896,7 @@ ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT endif endif ifdef CONFIG_HAVE_FENTRY + # s390-linux-gnu-gcc did not support -mfentry until gcc-9. ifeq ($(call cc-option-yn, -mfentry),y) CC_FLAGS_FTRACE += -mfentry CC_FLAGS_USING += -DCC_USING_FENTRY @@ -901,7 +909,7 @@ endif # We trigger additional mismatches with less inlining ifdef CONFIG_DEBUG_SECTION_MISMATCH -KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) +KBUILD_CFLAGS += -fno-inline-functions-called-once endif ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION @@ -980,14 +988,16 @@ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) # We'll want to enable this eventually, but it's not going away for 5.7 at least KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) -KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) +KBUILD_CFLAGS += -Wno-array-bounds KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) # Another good warning that we'll want to enable eventually KBUILD_CFLAGS += $(call cc-disable-warning, restrict) # Enabled with W=2, disabled by default as noisy -KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) +ifdef CONFIG_CC_IS_GCC +KBUILD_CFLAGS += -Wno-maybe-uninitialized +endif # disable invalid "can't wrap" optimizations for signed / pointers KBUILD_CFLAGS += -fno-strict-overflow @@ -996,7 +1006,9 @@ KBUILD_CFLAGS += -fno-strict-overflow KBUILD_CFLAGS += -fno-stack-check # conserve stack if available -KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) +ifdef CONFIG_CC_IS_GCC +KBUILD_CFLAGS += -fconserve-stack +endif # Prohibit date/time macros, which would make the build non-deterministic KBUILD_CFLAGS += -Werror=date-time diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 5ddd575159fb..7d3d29203a72 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -365,6 +365,7 @@ config STRIP_ASM_SYMS config READABLE_ASM bool "Generate readable assembler code" depends on DEBUG_KERNEL + depends on CC_IS_GCC help Disable some compiler optimizations that tend to generate human unreadable assembler output. This may make the kernel slightly slower, but it helps @@ -383,6 +384,7 @@ config HEADERS_INSTALL config DEBUG_SECTION_MISMATCH bool "Enable full Section mismatch analysis" + depends on CC_IS_GCC help The section mismatch analysis checks if there are illegal references from one section to another section. |