This one. https://gcc.gnu.org/ml/gcc-patches/2017-10/msg00537.html
There was discussion about documenting this, but the actual configure change hasn't been reviewed yet.
-Sandra
- [patch] configure option to override TARGET_LIBC_PROVIDES... Sandra Loosemore
- Re: [patch] configure option to override TARGET_LIBC... Joseph Myers
- Re: [patch] configure option to override TARGET_... Sandra Loosemore
- Re: [patch] configure option to override TAR... Gerald Pfeifer
- PING Re: [patch] configure option to overrid... Sandra Loosemore
- Re: [patch] configure option to override TAR... Joseph Myers
- Re: [patch] configure option to override TAR... Jeff Law
