split of aclocal/acinclude

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@4191 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/have-pragma-weak.m4

@@ -0,0 +1,37 @@
+dnl $Id$
+dnl
+AC_DEFUN(AC_HAVE_PRAGMA_WEAK, [
+if test "${with_shared}" = "yes"; then
+AC_MSG_CHECKING(for pragma weak)
+AC_CACHE_VAL(ac_have_pragma_weak, [
+ac_have_pragma_weak=no
+cat > conftest_foo.$ac_ext <<'EOF'
+[#]line __oline__ "configure"
+#include "confdefs.h"
+#pragma weak foo = _foo
+int _foo = 17;
+EOF
+cat > conftest_bar.$ac_ext <<'EOF'
+[#]line __oline__ "configure"
+#include "confdefs.h"
+extern int foo;
+
+int t() {
+  return foo;
+}
+
+int main() {
+  return t();
+}
+EOF
+if AC_TRY_EVAL('CC -o conftest $CFLAGS $CPPFLAGS $LDFLAGS conftest_foo.$ac_ext conftest_bar.$ac_ext 1>&AC_FD_CC'); then
+ac_have_pragma_weak=yes
+fi
+rm -rf conftest*
+])
+if test "$ac_have_pragma_weak" = "yes"; then
+	AC_DEFINE(HAVE_PRAGMA_WEAK, 1)dnl
+fi
+AC_MSG_RESULT($ac_have_pragma_weak)
+fi
+])