Hello Masahiro-san, Starting from kernel v4.17 it is no longer possible to install kernel headers for ARC architecture if there's no cross-toolchain in PATH. Note installation of headers is just one of use-cases when we might not have cross-tools available but still want to run "make xxx_defconfig". I.e. the problem is "make xxx_defconfig" with no cross-toolchain. That's what I see: ----------------------------->8-------------------------- ./scripts/gcc-version.sh: line 26: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 27: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 26: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 27: arc-linux-gcc: command not found make: arc-linux-gcc: Command not found /bin/sh: arc-linux-gcc: command not found /bin/sh: arc-linux-gcc: command not found *** Default configuration is based on 'nsim_700_defconfig' ./scripts/gcc-version.sh: line 26: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 27: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 29: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 26: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 27: arc-linux-gcc: command not found ./scripts/gcc-version.sh: line 29: arc-linux-gcc: command not found init/Kconfig:17: syntax error init/Kconfig:16: invalid option ./scripts/clang-version.sh: line 15: arc-linux-gcc: command not found ./scripts/gcc-plugin.sh: line 11: arc-linux-gcc: command not found make[1]: *** [scripts/kconfig/Makefile:91: defconfig] Error 1 make: *** [Makefile:531: defconfig] Error 2 ----------------------------->8-------------------------- That doesn't happen for ARM and other arches simply because for ARC we define CROSS_COMPILE if it is not set by user, see: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arc/Makefile#n9 Still if CROSS_COMPILE is set before execution of "make defconfig" then the same problem happens for others. I was able to find a series of commits which cause this problem, here they are: ----------------------------->8-------------------------- 59f53855babf - gcc-plugins: test plugin support in Kconfig and clean up Makefile 469cb7376c06 - kconfig: add CC_IS_CLANG and CLANG_VERSION a4353898980c - kconfig: add CC_IS_GCC and GCC_VERSION ----------------------------->8-------------------------- What happen is "$(CC)" is passed as an argument and in its turn CC is "$(CROSS_COMPILE)gcc", see: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Makefile#n385 So if I substitute "CC" with "HOSTCC" in a couple of places (see below) the problem goes away. But I'm not really sure if what I do is correct. I.e. when we're interested in CC for target and when only host CC is of our interest. Would be interesting to know your opinion here. -Alexey -------------------------------------->8--------------------------------------------- diff --git a/arch/Kconfig b/arch/Kconfig index d1f2ed462ac8..53c8c7994e6b 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -412,7 +412,7 @@ preferred-plugin-hostcc := $(if-success,[ $(gcc-version) -ge 40800 ],$(HOSTCXX), config PLUGIN_HOSTCC string - default "$(shell,$(srctree)/scripts/gcc-plugin.sh "$(preferred-plugin-hostcc)" "$(HOSTCXX)" "$(CC)")" + default "$(shell,$(srctree)/scripts/gcc-plugin.sh "$(preferred-plugin-hostcc)" "$(HOSTCXX)" "$(HOSTCC)")" help Host compiler used to build GCC plugins. This can be $(HOSTCXX), $(HOSTCC), or a null string if GCC plugin is unsupported. diff --git a/init/Kconfig b/init/Kconfig index 2a48832fd40e..a0094ddb8244 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -13,7 +13,7 @@ config CC_IS_GCC config GCC_VERSION int - default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC + default $(shell,$(srctree)/scripts/gcc-version.sh -p $(HOSTCC) | sed 's/^0*//') if CC_IS_GCC default 0 config CC_IS_CLANG @@ -21,7 +21,7 @@ config CC_IS_CLANG config CLANG_VERSION int - default $(shell,$(srctree)/scripts/clang-version.sh $(CC)) + default $(shell,$(srctree)/scripts/clang-version.sh $(HOSTCC)) config CONSTRUCTORS bool diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 86321f06461e..684cd645eeb1 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -109,7 +109,7 @@ as-instr = $(call try-run,\ printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) # __cc-option -# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) +# Usage: MY_CFLAGS += $(call __cc-option,$(HOSTCC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) __cc-option = $(call try-run,\ $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) @@ -143,11 +143,11 @@ cc-disable-warning = $(call try-run,\ cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc) # cc-version -cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) +cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(HOSTCC)) # cc-fullversion cc-fullversion = $(shell $(CONFIG_SHELL) \ - $(srctree)/scripts/gcc-version.sh -p $(CC)) + $(srctree)/scripts/gcc-version.sh -p $(HOSTCC)) # cc-ifversion # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index dad5583451af..3b28bf94cb24 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -27,4 +27,4 @@ cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null) ld-option = $(success,$(LD) -v $(1)) # gcc version including patch level -gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') +gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh -p $(HOSTCC) | sed 's/^0*//') -------------------------------------->8---------------------------------------------
