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-rw-r--r--gnulib-m4/memchr.m431
1 files changed, 14 insertions, 17 deletions
diff --git a/gnulib-m4/memchr.m4 b/gnulib-m4/memchr.m4
index cb958d86..ab773b81 100644
--- a/gnulib-m4/memchr.m4
+++ b/gnulib-m4/memchr.m4
@@ -1,5 +1,5 @@
-# memchr.m4 serial 12
-dnl Copyright (C) 2002-2004, 2009-2015 Free Software Foundation, Inc.
+# memchr.m4 serial 8
+dnl Copyright (C) 2002-2004, 2009-2010 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.
@@ -11,16 +11,10 @@ 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])
- 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
+ AC_CHECK_FUNCS_ONCE([memchr])
+ if test $ac_cv_func_memchr = yes; then
# Detect platform-specific bugs in some versions of glibc:
# memchr should not dereference anything with length 0
# http://bugzilla.redhat.com/499689
@@ -41,7 +35,6 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
# endif
#endif
]], [[
- int result = 0;
char *fence = NULL;
#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
# if HAVE_MAP_ANONYMOUS
@@ -65,20 +58,24 @@ AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
if (fence)
{
if (memchr (fence, 0, 0))
- result |= 1;
+ return 1;
strcpy (fence - 9, "12345678");
if (memchr (fence - 9, 0, 79) != fence - 1)
- result |= 2;
- if (memchr (fence - 1, 0, 3) != fence - 1)
- result |= 4;
+ return 2;
}
- return result;
+ return 0;
]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no],
[dnl Be pessimistic for now.
gl_cv_func_memchr_works="guessing no"])])
if test "$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
])