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From: "plevine457 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/96160] Building gcc with multiple make jobs fails
 with: gcc/xgcc: No such file or directory
Date: Sat, 11 Jul 2020 03:05:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96160

--- Comment #4 from plevine457 at gmail dot com ---
The offending command is
> /var/tmp/portage/sys-devel/gcc-10.1.0-r1/work/build/./gcc/xgcc -B/var/tmp=
/portage/sys-devel/gcc-10.1.0-r1/work/build/./gcc/ -xc++ -nostdinc /dev/nul=
l -S -o /dev/null -fself-test=3D/var/tmp/portage/sys-devel/gcc-10.1.0-r1/wo=
rk/gcc-10.1.0/gcc/testsuite/selftests

I would presume that there's no reason why gcc would emit "-o /dev/null"=20
though I have seen it whaile using ccache.=20=20

Looking further at
https://github.com/buildroot/buildroot/commit/58ecbbc3ef18c43ae1c02a5c4bf30=
aa7ef2d8092,
with regard to s-selftest-c:

> The problem only occurs when ccache is used with gcc 9 and 10,
> probably due to a race condition.
>=20
> While debuging with "make -p" we can notice that s-selftest-c target
> contain only "cc1" as dependency instead of cc1 and SELFTEST_DEPS [4].
>=20
>   s-selftest-c: cc1
>=20
> While the build is failing, the s-selftest-c dependencies recipe is
> still running and reported as a bug by make.
>=20
>   "Dependencies recipe running (THIS IS A BUG)."
>=20
> A change [5] in gcc 9 seems to introduce the problem since we can't
> reproduce this problem with gcc 8.

So this is likely a ccache bug.=