glibc-2.27 needs 2 more sanity checks from native compiler to pass configure:
libc_cv_compiler_powerpc64le_binary128_ok=yes
libc_cv_target_power8_ok=yes
Notices when tried clean toolchain botstrap for bug #652724
Bug: https://bugs.gentoo.org/652724
Package-Manager: Portage-2.3.28, Repoman-2.3.9
libc_cv_asm_cfi_directives=yes
libc_cv_broken_visibility_attribute=no
libc_cv_c_cleanup=yes
+ libc_cv_compiler_powerpc64le_binary128_ok=yes
libc_cv_forced_unwind=yes
libc_cv_gcc___thread=yes
libc_cv_mlong_double_128=yes
libc_cv_ppc_machine=yes
libc_cv_ppc_rel16=yes
libc_cv_predef_fortify_source=no
+ libc_cv_target_power8_ok=yes
libc_cv_visibility_attribute=yes
libc_cv_z_combreloc=yes
libc_cv_z_execstack=yes
libc_cv_asm_cfi_directives=yes
libc_cv_broken_visibility_attribute=no
libc_cv_c_cleanup=yes
+ libc_cv_compiler_powerpc64le_binary128_ok=yes
libc_cv_forced_unwind=yes
libc_cv_gcc___thread=yes
libc_cv_mlong_double_128=yes
libc_cv_ppc_machine=yes
libc_cv_ppc_rel16=yes
libc_cv_predef_fortify_source=no
+ libc_cv_target_power8_ok=yes
libc_cv_visibility_attribute=yes
libc_cv_z_combreloc=yes
libc_cv_z_execstack=yes