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+# Private macro for the teTeX / TeX live (TL) tree.
+# by Peter Breitenlohner, April 15, 1996.
+# Copyright (C) 1996 - 2009 Peter Breitenlohner <tex-live@tug.org>
+#
+# This file is free software; the copyright holder
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 3
+
+# KPSE_ASM_UNDERSCORE
+# -------------------
+# Check if gcc asm for i386 needs external symbols with an underscore.
+AC_DEFUN([KPSE_ASM_UNDERSCORE],
+[AC_CACHE_CHECK([whether gcc asm needs underscore],
+ [pb_cv_asm_underscore],
+ [
+# Some versions of GCC asm for i386 need an underscore prepended to
+# external symbols. Figure out if this is so.
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+extern char val ;
+extern void sub () ;
+#if defined (__i386__) && defined (__GNUC__)
+asm(" .align 4\n"
+".globl sub\n"
+"sub:\n"
+" movb \$][1,val\n"
+" ret\n");
+#else
+void sub () { val = 1; }
+#endif /* assembler */
+char val ;]],
+ [[sub (); return 0;]])],
+ [pb_cv_asm_underscore=no],
+ [pb_cv_asm_underscore=yes])])
+if test "x$pb_cv_asm_underscore" = xyes; then
+ AC_DEFINE([ASM_NEEDS_UNDERSCORE], 1,
+ [web2c: Define if gcc asm needs _ on external symbols.])
+fi
+]) # KPSE_ASM_UNDERSCORE
+