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39 lines
1.2 KiB
39 lines
1.2 KiB
dnl -*- Autoconf -*-
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dnl Copyright (C) 1993-2003 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl From Bruno Haible, Marcus Daniels, Sam Steingold.
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AC_PREREQ(2.57)
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AC_DEFUN([CL_AS_UNDERSCORE],
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[AC_BEFORE([$0], [CL_GLOBAL_CONSTRUCTORS])
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m4_pattern_allow([^AS_UNDERSCORE$])
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AC_CACHE_CHECK(for underscore in external names, cl_cv_prog_as_underscore, [
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cat > conftest.c <<EOF
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#ifdef __cplusplus
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extern "C"
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#endif
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int foo() { return 0; }
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EOF
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# look for the assembly language name in the .s file
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AC_TRY_COMMAND(${CC-cc} -S conftest.c) >/dev/null 2>&1
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if grep _foo conftest.s >/dev/null ; then
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cl_cv_prog_as_underscore=yes
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else
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cl_cv_prog_as_underscore=no
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fi
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rm -f conftest*
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])
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if test $cl_cv_prog_as_underscore = yes; then
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AS_UNDERSCORE=true
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AC_DEFINE(ASM_UNDERSCORE,,[symbols are prefixed by an underscore in assembly language])
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else
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AS_UNDERSCORE=false
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fi
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AC_SUBST(AS_UNDERSCORE)dnl
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])
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