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aclocal.m4 (ac_cv_func_mmap_dev_zero): Darwin does not allow mmap from /dev/zero.

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* aclocal.m4 (ac_cv_func_mmap_dev_zero): Darwin does not
	allow mmap from /dev/zero.  Don't make decisions for the host
	based on presence or absence of /dev/zero on the build machine.
	(ac_cv_func_mmap_anon): Darwin does have working MMAP_ANON.
	(AC_FUNC_MMAP_FILE): Darwin does have mmap of a file.
	* configure: Regenerate.

From-SVN: r59394
This commit is contained in:
Geoffrey Keating 2002-11-23 00:20:13 +00:00 committed by Geoffrey Keating
parent 05abed76a9
commit 199cbacc90
3 changed files with 175 additions and 156 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2002-11-22 Geoffrey Keating <geoffk@apple.com>
* aclocal.m4 (ac_cv_func_mmap_dev_zero): Darwin does not
allow mmap from /dev/zero. Don't make decisions for the host
based on presence or absence of /dev/zero on the build machine.
(ac_cv_func_mmap_anon): Darwin does have working MMAP_ANON.
(AC_FUNC_MMAP_FILE): Darwin does have mmap of a file.
* configure: Regenerate.
2002-11-22 Daniel Jacobowitz <drow@mvista.com>
* gcc.c (make_relative_prefix, split_directories)

21
gcc/aclocal.m4 vendored
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@ -660,14 +660,13 @@ AC_CACHE_CHECK(for working mmap from /dev/zero,
then ac_cv_func_mmap_dev_zero=no
else ac_cv_func_mmap_dev_zero=buggy
fi],
# If this is not cygwin, and /dev/zero is a character device, it's probably
# safe to assume it works.
# When cross-building, assume that this works, unless we know it
# doesn't. Of course, we have no way of knowing if there even is a /dev/zero
# on the host, let alone whether mmap will work on it.
[case "$host_os" in
cygwin* | win32 | pe | mingw* ) ac_cv_func_mmap_dev_zero=buggy ;;
* ) if test -c /dev/zero
then ac_cv_func_mmap_dev_zero=yes
else ac_cv_func_mmap_dev_zero=no
fi ;;
darwin* ) ac_cv_func_mmap_dev_zero=no ;;
* ) ac_cv_func_mmap_dev_zero=yes ;;
esac])
])
if test $ac_cv_func_mmap_dev_zero = yes; then
@ -687,7 +686,10 @@ AC_CACHE_CHECK([for working mmap with MAP_ANON(YMOUS)],
fi],
# Unlike /dev/zero, it is not safe to assume MAP_ANON(YMOUS) works
# just because it's there. Some SCO Un*xen define it but don't implement it.
ac_cv_func_mmap_anon=no)
[case "$host_os" in
darwin* ) ac_cv_func_mmap_anon=yes ;;
* ) ac_cv_func_mmap_anon=no ;;
esac])
])
if test $ac_cv_func_mmap_anon = yes; then
AC_DEFINE(HAVE_MMAP_ANON, 1,
@ -740,7 +742,10 @@ int main()
exit(0);
}], ac_cv_func_mmap_file=yes, ac_cv_func_mmap_file=no,
ac_cv_func_mmap_file=no)])
[case "$host_os" in
darwin* ) ac_cv_func_mmap_file=yes ;;
* ) ac_cv_func_mmap_file=no ;;
esac])])
if test $ac_cv_func_mmap_file = yes; then
AC_DEFINE(HAVE_MMAP_FILE, 1,
[Define if read-only mmap of a plain file works.])

301
gcc/configure vendored
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