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Diffstat (limited to 'Build/source/texk/m4/kpse_asm.m4')
-rw-r--r-- | Build/source/texk/m4/kpse_asm.m4 | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/Build/source/texk/m4/kpse_asm.m4 b/Build/source/texk/m4/kpse_asm.m4 new file mode 100644 index 00000000000..833003f00a1 --- /dev/null +++ b/Build/source/texk/m4/kpse_asm.m4 @@ -0,0 +1,42 @@ +# Private macro for the kpathsea library. +# by Peter Breitenlohner <peb@mppmu.mpg.de>, April 15, 1996. +# Copyright (C) 1996 - 2008 +# Free Software Foundation, Inc. +# +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# serial 1 + +# pb_AC_ASM_UNDERSCORE +# -------------------- +# Check if gcc asm for i386 needs external symbols with an underscore. +AC_DEFUN([pb_AC_ASM_UNDERSCORE], [ +AC_CACHE_CHECK([whether gcc asm needs underscore], + [pb_cv_asm_underscore], + [ +# Older versions of GCC asm for i386 need an underscore prepended to +# external symbols. Figure out if this is so. +AC_LINK_IFELSE([ +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 ; +int main() { 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 +] +) + |