[PATCH] libgccjit: Fix GGC segfault when using -flto

[David Malcolm]

On Fri, 2023-11-10 at 18:14 -0500, David Malcolm wrote:
> On Fri, 2023-11-10 at 11:02 -0500, Antoni Boucher wrote:
> > Hi.
> > This patch fixes the segfault when using -flto with libgccjit (bug
> > 111396).
> > 
> > You mentioned in bugzilla that this didn't fix the reproducer for
> > you,
> 
> Rereading https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111396 it
> looks
> like all I tested back in August was your reproducer; I didn't yet
> test
> your patch.
> 
> > but it does for me.
> > At first, the test case would not pass, but running "make install"
> > made
> > it pass.
> > Not sure if this is normal.
> > 
> > Could you please check if this fixes the issue on your side as
> > well?
> > Since this patch changes files outside of gcc/jit, what tests
> > should
> > I
> > run to make sure it didn't break anything?
> 
> I'm trying your patch in my tester now.

Bootstrapped with x86_64-pc-linux-gnu/build.  No changes to non-jit
tests, but had this effect on jit.sum:

Changes to jit.sum
------------------

  FAIL: 9->11 (+2)
  PASS: 14827->11434 (-3393)

apparently due to:
 FAIL: test-combination.c.exe iteration 1 of 5: verify_code_accessing_bitfield: result is NULL
 FAIL: test-combination.c.exe killed: 997638 exp16 0 0 CHILDKILLED SIGABRT SIGABRT

> 
> BTW, we shouldn't add test-ggc-bugfix to since it adds options to the
> context: this would affect all the other tests.