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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-07-12 04:06:13 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-07-12 04:06:13 +0000 |
| commit | bc028cdf170c1b42fc549028dcf2a0565473c9dd (patch) | |
| tree | 156e81e603b6d376e5735541a27f39046b66e50a /gcc/aclocal.m4 | |
| parent | 42de8277e53eabea04a48598c12ed6d488412a7b (diff) | |
| download | gcc-bc028cdf170c1b42fc549028dcf2a0565473c9dd.tar.gz | |
* aclocal.m4 (AC_FUNC_MMAP_ANYWHERE): Extend test to detect systems
with MAP_ANONYMOUS and MAP_ANON.
* configure, config.in: Rebuilt.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34977 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/aclocal.m4')
| -rw-r--r-- | gcc/aclocal.m4 | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/aclocal.m4 b/gcc/aclocal.m4 index e17e27752fb..cf53a36626c 100644 --- a/gcc/aclocal.m4 +++ b/gcc/aclocal.m4 @@ -684,19 +684,24 @@ fi AC_SUBST($1)dnl ]) -# Check whether mmap can map an arbitrary page from /dev/zero, without -# MAP_FIXED. +# Check whether mmap can map an arbitrary page from /dev/zero or with +# MAP_ANONYMOUS, without MAP_FIXED. AC_DEFUN([AC_FUNC_MMAP_ANYWHERE], [AC_CHECK_HEADERS(unistd.h) AC_CHECK_FUNCS(getpagesize) -AC_CACHE_CHECK(for working mmap from /dev/zero, ac_cv_func_mmap_anywhere, +AC_CACHE_CHECK(for working mmap which provides zeroed pages anywhere, + ac_cv_func_mmap_anywhere, [AC_TRY_RUN([ /* Test by Richard Henderson and Alexandre Oliva. - Check whether mmap from /dev/zero works. */ + Check whether mmap MAP_ANONYMOUS or mmap from /dev/zero works. */ #include <sys/types.h> #include <fcntl.h> #include <sys/mman.h> +#if !defined (MAP_ANONYMOUS) && defined (MAP_ANON) +# define MAP_ANONYMOUS MAP_ANON +#endif + /* This mess was copied from the GNU getpagesize.h. */ #ifndef HAVE_GETPAGESIZE # ifdef HAVE_UNISTD_H @@ -743,12 +748,19 @@ int main() char *x; int fd, pg; +#ifndef MAP_ANONYMOUS fd = open("/dev/zero", O_RDWR); if (fd < 0) exit(1); +#endif pg = getpagesize(); +#ifdef MAP_ANONYMOUS + x = (char*)mmap(0, pg, PROT_READ|PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); +#else x = (char*)mmap(0, pg, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); +#endif if (x == (char *) -1) exit(2); @@ -762,7 +774,7 @@ int main() ac_cv_func_mmap_anywhere=no)]) if test $ac_cv_func_mmap_anywhere = yes; then AC_DEFINE(HAVE_MMAP_ANYWHERE, 1, - [Define if mmap can get us zeroed pages from /dev/zero.]) + [Define if mmap can get us zeroed pages without MAP_FIXED.]) fi ]) |