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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Fri, 1 Jun 2018 10:31:11 +0200
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Subject: Re: [PATCH v5 00/31] kconfig: move compiler capability tests to Kconfig
To:     Masahiro Yamada <yamada.masahiro@socionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        "Luis R . Rodriguez" <mcgrof@suse.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Ulf Magnusson <ulfalizer@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
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On Wed, May 30, 2018 at 2:38 AM, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> 2018-05-28 21:23 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:
>> 2018-05-28 18:21 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:

>
> I pushed this series to the for-next branch.
> Unless a significant problem is reported,
> I'd like to merge this series in the upcoming MW.
> At least, I need to keep it in linux-next for a while.
>
> Your comments and tags are still appreciated.
> I will add tags (or replace patches if necessary) later,
> but I want this series tested in linux-next
> to expose to more developers' eyes.
>
> It passed my local test.  O-day bot did not report anything so far.

I found a problem when using ccache, resulting in this output while building
scripts/kconfig:

$  make V=1 O=obj-tmp/ CC="ccache gcc" defconfig
make[1]: Entering directory '/git/arm-soc'
make -C /home/arnd/arm-soc/obj-tmp KBUILD_SRC=/git/arm-soc \
-f /git/arm-soc/Makefile defconfig
make[2]: Entering directory '/git/arm-soc/obj-tmp'
make -f ../scripts/Makefile.build obj=scripts/basic
  gcc -Wp,-MD,scripts/basic/.fixdep.d -Iscripts/basic -Wall
-Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
-std=gnu89  -o scripts/basic/fixdep ../scripts/basic/fixdep.c
rm -f .tmp_quiet_recordmcount
ln -fsn .. source
/bin/bash ../scripts/mkmakefile \
    .. . 4 17
make -f ../scripts/Makefile.build obj=scripts/kconfig defconfig
  gcc -Wp,-MD,scripts/kconfig/.conf.o.d -Iscripts/kconfig -Wall
-Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
-std=gnu89 -c -o scripts/kconfig/conf.o ../scripts/kconfig/conf.c
  bison -oscripts/kconfig/zconf.tab.c -t -l ../scripts/kconfig/zconf.y
  flex -oscripts/kconfig/zconf.lex.c -L ../scripts/kconfig/zconf.l
  gcc -Wp,-MD,scripts/kconfig/.zconf.tab.o.d -Iscripts/kconfig -Wall
-Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
-std=gnu89  -I../scripts/kconfig -c -o scripts/kconfig/zconf.tab.o
scripts/kconfig/zconf.tab.c
  gcc  -o scripts/kconfig/conf scripts/kconfig/conf.o
scripts/kconfig/zconf.tab.o
scripts/kconfig/conf  --defconfig=arch/arm/configs/multi_v7_defconfig Kconfig
ccache: invalid option -- 'r'
Usage:
    ccache [options]
    ccache compiler [compiler options]
    compiler [compiler options]          (via symbolic link)

Options:
    -c, --cleanup         delete old files and recalculate size counters
                          (normally not needed as this is done automatically)
    -C, --clear           clear the cache completely (except configuration)
    -F, --max-files=N     set maximum number of files in cache to N (use 0 for
                          no limit)
    -M, --max-size=SIZE   set maximum size of cache to SIZE (use 0 for no
                          limit); available suffixes: k, M, G, T (decimal) and
                          Ki, Mi, Gi, Ti (binary); default suffix: G
    -o, --set-config=K=V  set configuration key K to value V
    -p, --print-config    print current configuration options
    -s, --show-stats      show statistics summary
    -z, --zero-stats      zero statistics counters

    -h, --help            print this help text
    -V, --version         print version and copyright information

See also <https://ccache.samba.org>.
#
# configuration written to .config
#
make[2]: Leaving directory '/git/arm-soc/obj-tmp'
make[1]: Leaving directory '/git/arm-soc'

It appears to just keep going after this output, but clearly something is wrong.
I bisected it to bde197706614 ("gcc-plugins: test plugin support in Kconfig
and clean up Makefile").

     Arnd