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authorManuel A. Fernandez Montecelo <manuel.montezelo@gmail.com>2016-05-27 14:35:16 +0100
committerManuel A. Fernandez Montecelo <manuel.montezelo@gmail.com>2016-05-27 14:35:16 +0100
commit3590c846d4c2febbc05b4ad6b14a06edc549e453 (patch)
treee5d38581c2f36e1cca02efedd2d85044d77f76f9 /gnulib-m4/memchr.m4
parenta9a31b1de5776a3b08a82101a4fa711294f0dd1d (diff)
Imported Upstream version 0.9.6+really0.9.6upstream/0.9.6+really0.9.6
Diffstat (limited to 'gnulib-m4/memchr.m4')
-rw-r--r--gnulib-m4/memchr.m431
1 files changed, 17 insertions, 14 deletions
diff --git a/gnulib-m4/memchr.m4 b/gnulib-m4/memchr.m4
index ab773b81..cb958d86 100644
--- a/gnulib-m4/memchr.m4
+++ b/gnulib-m4/memchr.m4
@@ -1,5 +1,5 @@
-# memchr.m4 serial 8
-dnl Copyright (C) 2002-2004, 2009-2010 Free Software Foundation, Inc.
+# memchr.m4 serial 12
+dnl Copyright (C) 2002-2004, 2009-2015 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
@@ -11,10 +11,16 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
AC_CHECK_HEADERS_ONCE([sys/mman.h])
AC_CHECK_FUNCS_ONCE([mprotect])
- dnl These days, we assume memchr is present. But just in case...
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
- AC_CHECK_FUNCS_ONCE([memchr])
- if test $ac_cv_func_memchr = yes; then
+ m4_ifdef([gl_FUNC_MEMCHR_OBSOLETE], [
+ dnl These days, we assume memchr is present. But if support for old
+ dnl platforms is desired:
+ AC_CHECK_FUNCS_ONCE([memchr])
+ if test $ac_cv_func_memchr = no; then
+ HAVE_MEMCHR=0
+ fi
+ ])
+ if test $HAVE_MEMCHR = 1; then
# Detect platform-specific bugs in some versions of glibc:
# memchr should not dereference anything with length 0
# http://bugzilla.redhat.com/499689
@@ -35,6 +41,7 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
# endif
#endif
]], [[
+ int result = 0;
char *fence = NULL;
#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
# if HAVE_MAP_ANONYMOUS
@@ -58,24 +65,20 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
if (fence)
{
if (memchr (fence, 0, 0))
- return 1;
+ result |= 1;
strcpy (fence - 9, "12345678");
if (memchr (fence - 9, 0, 79) != fence - 1)
- return 2;
+ result |= 2;
+ if (memchr (fence - 1, 0, 3) != fence - 1)
+ result |= 4;
}
- return 0;
+ return result;
]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no],
[dnl Be pessimistic for now.
gl_cv_func_memchr_works="guessing no"])])
if test "$gl_cv_func_memchr_works" != yes; then
REPLACE_MEMCHR=1
fi
- else
- HAVE_MEMCHR=0
- fi
- if test $HAVE_MEMCHR = 0 || test $REPLACE_MEMCHR = 1; then
- AC_LIBOBJ([memchr])
- gl_PREREQ_MEMCHR
fi
])