https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55610
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Iain D Sandoe <ia...@gcc.gnu.org>: https://gcc.gnu.org/g:22a982409323feb203401d345488a5a9c18e6733 commit r12-5759-g22a982409323feb203401d345488a5a9c18e6733 Author: Iain Sandoe <i...@sandoe.co.uk> Date: Sat Nov 13 12:39:09 2021 +0000 Darwin: Rewrite host PCH support [PR 55610]. We need to revise the PCH memory allocation scheme to enable support for PIE on aarch64. The rewrite uses a similar scheme to the one used on Linux. We attempt to identify VM segments for each arch/OS version that are always available to the compiler (note this is not general, it only needs to work for the cc1* exes). If we cannot find the preferred segment we fall back to allowing the kernel to supply one - this is more likely to fail when the PCH read-in occurs (but that is trapped). In doing this we obviate the need to unmap any part of the compiler __DATA segment - thus fixing PR 55610. Signed-off-by: Iain Sandoe <i...@sandoe.co.uk> gcc/ChangeLog: PR target/55610 * config/host-darwin.c (TRY_EMPTY_VM_SPACE, SAFE_ALLOC_SIZE): New. (darwin_gt_pch_get_address): Rewrite to use nominated memory segments rather than part of the compiler __DATA segment. (darwin_gt_pch_use_address): Likewise.
