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Re: bootstrap/3163: gcc/aclocal.m4 mmap test fails on UnixWare 7.1.1
- From: Craig Rodrigues <rodrigc at attbi dot com>
- To: gcc-gnats at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, john at Calva dot COM, gcc-bugs at gcc dot gnu dot org, nobody at gcc dot gnu dot org
- Date: Sat, 23 Feb 2002 21:56:20 -0500
- Subject: Re: bootstrap/3163: gcc/aclocal.m4 mmap test fails on UnixWare 7.1.1
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3163
john@calva.com posted this info in PR 3162:
libiberty/aclocal.m4 has a check to see if strncmp runs off the
end of the string. It incorrectly fails on systems where
MAP_ANON(YMOUS) must be used without an open fd, for example
UnixWare 7.1.1.
--- libiberty/aclocal.m4.orig Wed Nov 22 09:32:26 2000
+++ libiberty/aclocal.m4 Wed Jun 13 12:48:35 2001
@@ -21,8 +21,6 @@
#ifndef MAP_ANON
#ifdef MAP_ANONYMOUS
#define MAP_ANON MAP_ANONYMOUS
-#else
-#define MAP_ANON MAP_FILE
#endif
#endif
@@ -39,6 +37,10 @@
{
#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
char *p;
+#ifdef MAP_ANON
+ p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
+ MAP_ANON|MAP_PRIVATE, -1, 0);
+#else
int dev_zero;
dev_zero = open ("/dev/zero", O_RDONLY);
@@ -46,7 +48,8 @@
exit (1);
p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
- MAP_ANON|MAP_PRIVATE, dev_zero, 0);
+ MAP_FILE|MAP_PRIVATE, dev_zero, 0);
+#endif
if (p == (char *)-1)
exit (2);
else