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#serial 1
dnl From Jim Meyering.
dnl FIXME: describe
AC_DEFUN(jm_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK,
[
AC_CACHE_CHECK(
[whether lstat dereferences a symlink specified with a trailing slash],
jm_cv_func_lstat_dereferences_slashed_symlink,
[
rm -f conftest.sym conftest.file
: > conftest.file
if ln -s conftest.file conftest.sym; then
AC_TRY_RUN([
# include <sys/types.h>
# include <sys/stat.h>
int
main ()
{
struct stat sbuf;
/* Linux will dereference the symlink and fail.
That is better in the sense that it means we will not
have to compile and use the lstat wrapper. */
exit (lstat ("conftest.sym/", &sbuf) ? 0 : 1);
}
],
jm_cv_func_lstat_dereferences_slashed_symlink=yes,
jm_cv_func_lstat_dereferences_slashed_symlink=no,
dnl When crosscompiling, be pessimistic so we will end up using the
dnl replacement version of lstat that checkes for trailing slashes
dnl and calls lstat a second time when necessary.
jm_cv_func_lstat_dereferences_slashed_symlink=no
)
else
# If the `ln -s' command failed, then we probably don't even
# have an lstat function.
jm_cv_func_lstat_dereferences_slashed_symlink=no
fi
])
test $jm_cv_func_lstat_dereferences_slashed_symlink = yes \
&& zero_one=1 \
|| zero_one=0
AC_DEFINE_UNQUOTED(LSTAT_FOLLOWS_SLASHED_SYMLINK, $zero_one,
[Define if lstat dereferences a symlink specified with a trailing slash])
if test $jm_cv_func_lstat_dereferences_slashed_symlink = no; then
AC_SUBST(LIBOBJS)
# Append lstat.o if it's not already in $LIBOBJS.
case "$LIBOBJS" in
*lstat.$ac_objext*) ;;
*) LIBOBJS="$LIBOBJS lstat.$ac_objext" ;;
esac
fi
])
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