[Bug c/90653] --with-build-sysroot= not honored for ./configure C compiler checks.

[kallisti5 at unixzen dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90653

--- Comment #5 from Alexander von Gluck <kallisti5 at unixzen dot com> ---
Created attachment 46423
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46423&action=edit
gcc7-verbose.txt