From 1b3e142338984166b58727c31d24617cfc0a07dc Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Mon, 18 Oct 1999 09:38:40 -0700 Subject: [PATCH] * ggc-page.c (init_ggc): Work around SunOS unaligned mmap bug. From-SVN: r30070 --- gcc/ggc-page.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/gcc/ggc-page.c b/gcc/ggc-page.c index ecd116db5e6..24a8e2de2ad 100644 --- a/gcc/ggc-page.c +++ b/gcc/ggc-page.c @@ -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); } -- 2.30.2