diff options
| -rw-r--r-- | Makefile | 30 |
1 files changed, 29 insertions, 1 deletions
@@ -248,6 +248,11 @@ HOSTCXX = g++ HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer HOSTCXXFLAGS = -O2 +ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) +HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ + -Wno-missing-field-initializers -fno-delete-null-pointer-checks +endif + # Decide whether to build built-in, modular, or both. # Normally, just do built-in. @@ -324,6 +329,14 @@ endif export quiet Q KBUILD_VERBOSE +ifneq ($(CC),) +ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) +COMPILER := clang +else +COMPILER := gcc +endif +export COMPILER +endif # Look for make include files relative to root of kernel src MAKEFLAGS += --include-dir=$(srctree) @@ -383,7 +396,7 @@ KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ -fno-strict-aliasing -fno-common \ -Werror-implicit-function-declaration \ -Wno-format-security \ - -fno-delete-null-pointer-checks + $(call cc-option,-fno-delete-null-pointer-checks,) KBUILD_AFLAGS_KERNEL := KBUILD_CFLAGS_KERNEL := KBUILD_AFLAGS := -D__ASSEMBLY__ @@ -623,9 +636,24 @@ endif endif KBUILD_CFLAGS += $(stackp-flag) +ifeq ($(COMPILER),clang) +KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) +KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) +KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) +KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) +KBUILD_CFLAGS += $(call cc-disable-warning, gnu) +# Quiet clang warning: comparison of unsigned expression < 0 is always false +KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) +# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the +# source of a reference will be _MergedGlobals and not on of the whitelisted names. +# See modpost pattern 2 +KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) +else + # This warning generated too much noise in a regular build. # Use make W=1 to enable this warning (see scripts/Makefile.build) KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) +endif ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls |