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1 office 1 # asm-underscore.m4 serial 1
2 dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
6  
7 dnl From Bruno Haible. Based on as-underscore.m4 in GNU clisp.
8  
9 # gl_ASM_SYMBOL_PREFIX
10 # Tests for the prefix of C symbols at the assembly language level and the
11 # linker level. This prefix is either an underscore or empty. Defines the
12 # C macro USER_LABEL_PREFIX to this prefix, and sets ASM_SYMBOL_PREFIX to
13 # a stringified variant of this prefix.
14  
15 AC_DEFUN([gl_ASM_SYMBOL_PREFIX],
16 [
17 dnl We don't use GCC's __USER_LABEL_PREFIX__ here, because
18 dnl 1. It works only for GCC.
19 dnl 2. It is incorrectly defined on some platforms, in some GCC versions.
20 AC_CACHE_CHECK(
21 [whether C symbols are prefixed with underscore at the linker level],
22 [gl_cv_prog_as_underscore],
23 [cat > conftest.c <<EOF
24 #ifdef __cplusplus
25 extern "C" int foo (void);
26 #endif
27 int foo(void) { return 0; }
28 EOF
29 # Look for the assembly language name in the .s file.
30 AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c) >/dev/null 2>&1
31 if grep _foo conftest.s >/dev/null ; then
32 gl_cv_prog_as_underscore=yes
33 else
34 gl_cv_prog_as_underscore=no
35 fi
36 rm -f conftest*
37 ])
38 if test $gl_cv_prog_as_underscore = yes; then
39 USER_LABEL_PREFIX=_
40 else
41 USER_LABEL_PREFIX=
42 fi
43 AC_DEFINE_UNQUOTED([USER_LABEL_PREFIX], [$USER_LABEL_PREFIX],
44 [Define to the prefix of C symbols at the assembler and linker level,
45 either an underscore or empty.])
46 ASM_SYMBOL_PREFIX='"'${USER_LABEL_PREFIX}'"'
47 AC_SUBST([ASM_SYMBOL_PREFIX])
48 ])