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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
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