diff options
| author | Iain Sandoe <iain@sandoe.co.uk> | 2021-11-13 12:39:09 +0000 |
|---|---|---|
| committer | Iain Sandoe <iain@sandoe.co.uk> | 2021-12-02 19:44:44 +0000 |
| commit | 22a982409323feb203401d345488a5a9c18e6733 (patch) | |
| tree | d1b59ebd2620f197c94fa2a5d00817dc007700f1 /gcc/config.gcc | |
| parent | 2835977f8460ea59e7d3c877453fa358b31f9a7f (diff) | |
| download | gcc-22a982409323feb203401d345488a5a9c18e6733.zip gcc-22a982409323feb203401d345488a5a9c18e6733.tar.gz gcc-22a982409323feb203401d345488a5a9c18e6733.tar.bz2 | |
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 <iain@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.
Diffstat (limited to 'gcc/config.gcc')
0 files changed, 0 insertions, 0 deletions