--- /dev/null
+/* Define if using GNU ld, with support for weak symbols in a.out,
+ and for symbol set and warning messages extensions in a.out and ELF.
+ This implies HAVE_WEAK_SYMBOLS; set by --with-gnu-ld. */
+#undef HAVE_GNU_LD
+
+/* Define if using ELF, which supports weak symbols.
+ This implies HAVE_WEAK_SYMBOLS; set by --with-elf. */
+#undef HAVE_ELF
+
+/* Define if weak symbols are available in the assembler and
+ linker being used. Set by --with-weak-symbols. */
+#undef HAVE_WEAK_SYMBOLS
+
+/* Define if using the GNU assembler, gas. */
+#undef HAVE_GNU_AS