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43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
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# alloca.m4 serial 5
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dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_ALLOCA],
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[
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dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
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AC_REQUIRE([AC_PROG_CPP])
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AC_REQUIRE([AC_PROG_EGREP])
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AC_REQUIRE([AC_FUNC_ALLOCA])
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if test $ac_cv_func_alloca_works = no; then
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gl_PREREQ_ALLOCA
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fi
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# Define an additional variable used in the Makefile substitution.
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if test $ac_cv_working_alloca_h = yes; then
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AC_EGREP_CPP([Need own alloca], [
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#if defined __GNUC__ || defined _AIX || defined _MSC_VER
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Need own alloca
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#endif
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],
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[AC_DEFINE(HAVE_ALLOCA, 1,
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[Define to 1 if you have `alloca' after including <alloca.h>,
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a header that may be supplied by this distribution.])
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ALLOCA_H=alloca.h],
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[ALLOCA_H=])
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else
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ALLOCA_H=alloca.h
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fi
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AC_SUBST([ALLOCA_H])
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AC_DEFINE(HAVE_ALLOCA_H, 1,
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[Define HAVE_ALLOCA_H for backward compatibility with older code
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that includes <alloca.h> only if HAVE_ALLOCA_H is defined.])
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])
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# Prerequisites of lib/alloca.c.
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# STACK_DIRECTION is already handled by AC_FUNC_ALLOCA.
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AC_DEFUN([gl_PREREQ_ALLOCA], [:])
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