Hi Eric,
There seems to be a bug in warn-on-use.m4 when used with autoconf-2.60.
No problem with autoconf-2.61 and newer.
How to reproduce:
- Put autoconf 2.60 binaries in PATH.
- Use automake 1.10 or 1.9.6.
- $ ./gnulib-tool --create-testdir --dir=/tmp/testdir sys_stat
- $ cd /tmp/testdir
- $ ./configure
...
checking whether fchmodat is declared without a macro... ./configure: line
6206: ${$as_gl_Symbol+set}: bad substitution
checking for a thread-safe mkdir -p... /arch/x86-linux/gnu/bin/mkdir -p
...
The expansion in configure looks like this:
for gl_func in fchmodat fstatat futimens lchmod lstat mkdirat mkfifo mkfifoat
mknod mknodat stat utimensat; do
as_gl_Symbol=`echo "gl_cv_have_raw_decl_$gl_func" | $as_tr_sh`
{ echo "$as_me:$LINENO: checking whether $gl_func is declared without a
macro" >&5
echo $ECHO_N "checking whether $gl_func is declared without a macro... $ECHO_C"
>&6; }
if test "${$as_gl_Symbol+set}" = set; then <======
BUG
echo $ECHO_N "(cached) $ECHO_C" >&6
else
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
...
$as_gl_Symbol=yes <======
BUG
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
$as_gl_Symbol=no <======
BUG
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ echo "$as_me:$LINENO: result: $$as_gl_Symbol" >&5 <======
BUG
echo "${ECHO_T}$$as_gl_Symbol" >&6; } <======
BUG
if test x"$$as_gl_Symbol" = x""yes; then <======
BUG
As you can see, all uses of $as_gl_Symbol are broken.
Bruno
