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* ggc-page.c (init_ggc): Work around SunOS unaligned mmap bug.

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From-SVN: r30070
This commit is contained in:
Richard Henderson 1999-10-18 09:38:40 -07:00
parent 3da5522a60
commit 1b3e142338
1 changed files with 20 additions and 0 deletions
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20
gcc/ggc-page.c
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@ -797,6 +797,26 @@ init_ggc ()
G.allocated_last_gc = GGC_MIN_LAST_ALLOCATED;
#ifdef HAVE_MMAP
/* StunOS has an amazing off-by-one error for the first mmap allocation
after fiddling with RLIMIT_STACK. The result, as hard as it is to
believe, is an unaligned page allocation, which would cause us to
hork badly if we tried to use it. */
{
char *p = alloc_anon (NULL, G.pagesize);
if ((size_t)p & (G.pagesize - 1))
{
/* How losing. Discard this one and try another. If we still
can't get something useful, give up. */
p = alloc_anon (NULL, G.pagesize);
if ((size_t)p & (G.pagesize - 1))
abort ();
}
munmap (p, G.pagesize);
}
#endif
empty_string = ggc_alloc_string ("", 0);
ggc_add_string_root (&empty_string, 1);
}