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Kbuild fixes for v4.19 (2nd)

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- Fix warnings from recordmcount.pl when building with Clang
 
  - Allow Clang to use GNU toolchains correctly
 
  - Disable CONFIG_SAMPLES for UML to avoid build error
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Merge tag 'kbuild-fixes-v4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Masahiro writes:
  "Kbuild fixes for v4.19 (2nd)
   - Fix warnings from recordmcount.pl when building with Clang
   - Allow Clang to use GNU toolchains correctly
   - Disable CONFIG_SAMPLES for UML to avoid build error"

* tag 'kbuild-fixes-v4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  samples: disable CONFIG_SAMPLES for UML
  kbuild: allow to use GCC toolchain not in Clang search path
  ftrace: Build with CPPFLAGS to get -Qunused-arguments
This commit is contained in:
Greg Kroah-Hartman 2018-10-11 19:23:07 +02:00
commit e5337178f7
3 changed files with 7 additions and 4 deletions
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8
Makefile
View File

@ -483,13 +483,15 @@ endif
ifeq ($(cc-name),clang) ifeq ($(cc-name),clang)
ifneq ($(CROSS_COMPILE),) ifneq ($(CROSS_COMPILE),)
CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR)
GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
endif endif
ifneq ($(GCC_TOOLCHAIN),) ifneq ($(GCC_TOOLCHAIN),)
CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
endif endif
KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
endif endif

1
samples/Kconfig
View File

@ -1,5 +1,6 @@
menuconfig SAMPLES menuconfig SAMPLES
bool "Sample kernel code" bool "Sample kernel code"
depends on !UML
help help
You can build and test sample kernel code here. You can build and test sample kernel code here.

2
scripts/Makefile.build
View File

@ -219,7 +219,7 @@ else
sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
"$(if $(CONFIG_64BIT),64,32)" \ "$(if $(CONFIG_64BIT),64,32)" \
"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
"$(if $(part-of-module),1,0)" "$(@)"; "$(if $(part-of-module),1,0)" "$(@)";
recordmcount_source := $(srctree)/scripts/recordmcount.pl recordmcount_source := $(srctree)/scripts/recordmcount.pl