It's a follow-up to the breakage caused by 21966e13d2
("gcc: pass --with-build-sysroot=/"). It caused `pkgsLLVM`
cross-toolchain bootstrap breakage:
$ nix build --no-link -f. pkgsLLVM.hello
...
failed: /nix/store/...-x86_64-unknown-linux-gnu-stage-static-gcc-13.0.0.drv:
...
configure flags: ... --enable-languages=c --disable-multilib \
--disable-shared --enable-plugin ... --disable-libssp --disable-nls \
--without-headers --disable-threads --disable-libgomp --disable-libquadmath \
--disable-shared --disable-libatomic --disable-decimal-float --disable-libmpx \
--disable-bootstrap \
\
--build=x86_64-unknown-linux-gnu \
--host=x86_64-unknown-linux-gnu \
--target=x86_64-unknown-linux-gnu
...
The directory that should contain system headers does not exist:
/usr/include
make[2]: *** [Makefile:3279: stmp-fixinc] Error 1 shuffle=1658621302
rm gfdl.pod gcc.pod gcov-dump.pod gcov-tool.pod fsf-funding.pod gpl.pod cpp.pod gcov.pod lto-dump.pod
make[2]: Leaving directory '/build/build/gcc'
Note: it's a no-libc build. It's not expected to use any libc headers.
But in this case fixincludes tries to run and uses default /usr/include
location.
Fixinsludes is not normally expected to run during cross-compilation
on --without-headers. gcc/configure.ac:
: ${inhibit_libc=false}
if { { test x$host != x$target && test "x$with_sysroot" = x ; } ||
test x$with_newlib = xyes ; } &&
{ test "x$with_headers" = xno || test ! -f "$target_header_dir/stdio.h"; } ; then
inhibit_libc=true
fi
The change explicitly passes inhibit_libc=true to configure to disable
include fixing on such cases.
Fixed `nix build --no-link -f. pkgsLLVM.hello` toolchain bootstrap.
ea8e124000