[gentoo-user] Please help with `C compiler cannot create executables'

[Akater]

This came unexpectedly. An excerpt from compile.log is posted
below. (I'll post more if necessary of course.) I'm not very experienced
with C compilers in general and gcc in particular so I hope for some
directions on what the cause of the issue might be. I tried removing
CFLAGS settings from make.conf, to no effect.
(CFLAGS is `-march=native -O2 -pipe')

I upgraded GCC recently; world, kernel rebuilt successfully and gcc had
been working just fine for some time since then.

I did not do anything particularly weird with the system that could
cause this. However,
(1) I do use a somewhat old profile:
hardened/linux/amd64 (stable).
(2) I recently had a build conflict with
util-linux and rfkill: the latter had been included in the former but I
was not aware of that at the time and updated some packages (don't
remember which ones) while masking the corresponding util-linux version
and newer versions. Still, it was a normal portage update and no
warnings were issued.
(3) The kernel sources used are non-standard.

A relevant bit from compile.log (the package is sys-apps/file):

> gcc version 7.3.0 (Gentoo Hardened 7.3.0-r3 p1.4)
> configure:3711: $? = 0
> configure:3700: x86_64-pc-linux-gnu-gcc -V >&5
> x86_64-pc-linux-gnu-gcc: error: unrecognized command line option '-V'
> x86_64-pc-linux-gnu-gcc: fatal error: no input files
> compilation terminated.
> configure:3711: $? = 1
> configure:3700: x86_64-pc-linux-gnu-gcc -qversion >&5
> x86_64-pc-linux-gnu-gcc: error: unrecognized command line option '-qversion'; did you mean '--version'?
> x86_64-pc-linux-gnu-gcc: fatal error: no input files
> compilation terminated.
> configure:3711: $? = 1
> configure:3731: checking whether the C compiler works
> configure:3753: x86_64-pc-linux-gnu-gcc -march=native -O2 -pipe  -Wl,-O1 -Wl,--as-needed conftest.c  >&5
> cc1: fatal error: /usr/local/include/stdc-predef.h: Permission denied
> compilation terminated.
> configure:3757: $? = 1
> configure:3795: result: no
> configure: failed program was:
> | /* confdefs.h */
> | #define PACKAGE_NAME "file"
> | #define PACKAGE_TARNAME "file"
> | #define PACKAGE_VERSION "5.33"
> | #define PACKAGE_STRING "file 5.33"
> | #define PACKAGE_BUGREPORT "christos@××××××.com"
> | #define PACKAGE_URL ""
> | #define PACKAGE "file"
> | #define VERSION "5.33"
> | #define BUILTIN_ELF 1
> | #define ELFCORE 1
> | /* end confdefs.h.  */
> |
> | int
> | main ()
> | {
> |
> |   ;
> |   return 0;
> | }
> configure:3800: error: in `/var/tmp/portage/sys-apps/file-5.33-r4/work/file-5.33-abi_x86_64.amd64':
> configure:3802: error: C compiler cannot create executables

Note:

> ~ $ sudo ls -la /usr/local/include
> total 12
> drwxr-x--- 3 root root 4096 Jul 24 02:12 .
> drwxr-xr-x 8 root root 4096 Jul 24 02:12 ..
> drwxr-x--- 2 root root 4096 Jul 24 02:12 ykpers-1

Thank you.