On Mon, 13 May 2019 at 02:28, Masahiro Yamada
<yamada.masahiro@xxxxxxxxxxxxx> wrote:
>
> On Thu, May 9, 2019 at 4:36 PM Masahiro Yamada
> <yamada.masahiro@xxxxxxxxxxxxx> wrote:
> >
> > If the compiler specified by $(CC) is not present, the Kconfig stage
> > sprinkles 'not found' messages, then succeeds.
> >
> > $ make CROSS_COMPILE=foo defconfig
> > /bin/sh: 1: foogcc: not found
> > /bin/sh: 1: foogcc: not found
> > *** Default configuration is based on 'x86_64_defconfig'
> > ./scripts/gcc-version.sh: 17: ./scripts/gcc-version.sh: foogcc: not found
> > ./scripts/gcc-version.sh: 18: ./scripts/gcc-version.sh: foogcc: not found
> > ./scripts/gcc-version.sh: 19: ./scripts/gcc-version.sh: foogcc: not found
> > ./scripts/gcc-version.sh: 17: ./scripts/gcc-version.sh: foogcc: not found
> > ./scripts/gcc-version.sh: 18: ./scripts/gcc-version.sh: foogcc: not found
> > ./scripts/gcc-version.sh: 19: ./scripts/gcc-version.sh: foogcc: not found
> > ./scripts/clang-version.sh: 11: ./scripts/clang-version.sh: foogcc: not found
> > ./scripts/gcc-plugin.sh: 11: ./scripts/gcc-plugin.sh: foogcc: not found
> > init/Kconfig:16:warning: 'GCC_VERSION': number is invalid
> > #
> > # configuration written to .config
> > #
> >
> > Terminate parsing files immediately if $(CC) or $(LD) is not found.
> > "make *config" will fail more nicely.
> >
> > $ make CROSS_COMPILE=foo defconfig
> > *** Default configuration is based on 'x86_64_defconfig'
> > scripts/Kconfig.include:34: compiler 'foogcc' not found
> > make[1]: *** [scripts/kconfig/Makefile;82: defconfig] Error 1
> > make: *** [Makefile;557: defconfig] Error 2
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> > ---
>
> Applied to linux-kbuild.
Thanks Masahiro! I had this in my inbox to test but you're too efficient.
Testing your patch on linus' tree as of today (d7a02fa0a8f9) gives me
this output:
$ CROSS_COMPILE=foo make
make: foogcc: Command not found
scripts/kconfig/conf --syncconfig Kconfig
scripts/Kconfig.include:34: compiler 'foogcc' not found
make[2]: *** [scripts/kconfig/Makefile:69: syncconfig] Error 1
make[1]: *** [Makefile:557: syncconfig] Error 2
make: *** [include/config/auto.conf.cmd] Deleting file
'include/config/tristate.conf'
make: Failed to remake makefile 'include/config/auto.conf'.
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_64.o
HOSTCC arch/x86/tools/relocs_common.o
HOSTLD arch/x86/tools/relocs
UPD include/config/kernel.release
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
WRAP arch/x86/include/generated/uapi/asm/socket.h
WRAP arch/x86/include/generated/uapi/asm/sockios.h
WRAP arch/x86/include/generated/asm/dma-contiguous.h
WRAP arch/x86/include/generated/asm/early_ioremap.h
WRAP arch/x86/include/generated/asm/export.h
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/mm-arch-hooks.h
WRAP arch/x86/include/generated/asm/mmiowb.h
UPD include/generated/uapi/linux/version.h
UPD include/generated/utsrelease.h
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/kallsyms
HOSTCC scripts/pnmtologo
HOSTCC scripts/conmakehash
HOSTCC scripts/sortextable
HOSTCC scripts/asn1_compiler
HOSTCC scripts/extract-cert
You are building kernel with non-retpoline compiler.
Please update your compiler.
make: *** [arch/x86/Makefile:308: checkbin] Error 1
Which is a little confusing.
The second time is shorter, but the retpoline message is not ideal:
$ CROSS_COMPILE=foo make
make: foogcc: Command not found
scripts/kconfig/conf --syncconfig Kconfig
scripts/Kconfig.include:34: compiler 'foogcc' not found
make[2]: *** [scripts/kconfig/Makefile:69: syncconfig] Error 1
make[1]: *** [Makefile:557: syncconfig] Error 2
make: Failed to remake makefile 'include/config/auto.conf'.
You are building kernel with non-retpoline compiler.
Please update your compiler.
Cheers,
Joel
>
>
> > Makefile | 2 +-
> > scripts/Kconfig.include | 8 ++++++++
> > 2 files changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 28965187c528..bd7ae11947cb 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -537,7 +537,7 @@ endif
> > # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
> > # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
> > # and from include/config/auto.conf.cmd to detect the compiler upgrade.
> > -CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
> > +CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
> >
> > ifeq ($(config-targets),1)
> > # ===========================================================================
> > diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> > index 87ff1dcc6bd5..0b267fb27f07 100644
> > --- a/scripts/Kconfig.include
> > +++ b/scripts/Kconfig.include
> > @@ -18,6 +18,10 @@ if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
> > # Return y if <command> exits with 0, n otherwise
> > success = $(if-success,$(1),y,n)
> >
> > +# $(failure,<command>)
> > +# Return n if <command> exits with 0, y otherwise
> > +failure = $(if-success,$(1),n,y)
> > +
> > # $(cc-option,<flag>)
> > # Return y if the compiler supports <flag>, n otherwise
> > cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null)
> > @@ -26,5 +30,9 @@ cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null)
> > # Return y if the linker supports <flag>, n otherwise
> > ld-option = $(success,$(LD) -v $(1))
> >
> > +# check if $(CC) and $(LD) exist
> > +$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
> > +$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
> > +
> > # gcc version including patch level
> > gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh $(CC))
> > --
> > 2.17.1
> >
>
>
> --
> Best Regards
> Masahiro Yamada
