-# memchr.m4 serial 10
-dnl Copyright (C) 2002-2004, 2009-2011 Free Software Foundation, Inc.
+# memchr.m4 serial 12
+dnl Copyright (C) 2002-2004, 2009-2014 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.
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 $HAVE_MEMCHR = 1; then
# Detect platform-specific bugs in some versions of glibc:
# memchr should not dereference anything with length 0
# http://bugzilla.redhat.com/499689
if test "$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
])