Checks generated from the AC_REPLACE_FUNCS macro fail for every
function except the first one. This bug is in the released
autoconf-2.68 as well as in the current git tree. The following small
configure.ac file demonstrates the issue:
AC_INIT
funcs="asprintf atexit vfprintf"
AC_REPLACE_FUNCS($funcs)
AC_OUTPUT
Executing the resulting configure script results in:
checking for asprintf... yes
checking for atexit... no
checking for vfprintf... no
even if all three functions are available. The failures are caused by
this strange define in the check's C-code:
#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
This is the part of the autoconf generated configure script that
generates this faulty C-code:
for ac_func in $funcs
do :
as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
cat >>confdefs.h <<_ACEOF
#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
_ACEOF
$as_echo "#define \`\$as_echo \"HAVE_\$ac_func\" | \$as_tr_cpp\` 1"
>>confdefs.h
else
case " $LIBOBJS " in
*" $ac_func.$ac_objext "* ) ;;
*) LIBOBJS="$LIBOBJS $ac_func.$ac_objext"
;;
esac
fi
done
The strange define comes from the line after the _ACEOF. The following
patch fixes the issue for me. Please review and consider it for
inclusion in autoconf-2.69.
diff -Nur autoconf-2.68.orig/lib/autoconf/functions.m4
autoconf-2.68/lib/autoconf/functions.m4
--- autoconf-2.68.orig/lib/autoconf/functions.m4 2010-09-22
23:52:19.000000000 +0200
+++ autoconf-2.68/lib/autoconf/functions.m4 2011-06-28
18:19:48.848343002 +0200
@@ -138,7 +138,7 @@
[m4_map_args_w([$1], [_AC_REPLACE_FUNC(], [)
])],
[AC_CHECK_FUNCS([$1],
- [_AH_CHECK_FUNC([$ac_func])AC_DEFINE(AS_TR_CPP([HAVE_$ac_func]))],
+ [_AH_CHECK_FUNC([$ac_func])],
[_AC_LIBOBJ([$ac_func])])])])
