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52 lines
1.6 KiB
52 lines
1.6 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_ALLOCA],
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[# The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
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# for constant arguments. Useless!
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CL_LINK_CHECK(working alloca.h, cl_cv_header_alloca_h,
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[#include <alloca.h>], [char *p = (char *) alloca(2 * sizeof(int));],
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AC_DEFINE(HAVE_ALLOCA_H,,[have <alloca.h> and it should be used (not Ultrix)]))
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decl="#ifdef __GNUC__
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#define alloca __builtin_alloca
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#else
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#ifdef _MSC_VER
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#include <malloc.h>
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#define alloca _alloca
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#else
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#ifdef HAVE_ALLOCA_H
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#include <alloca.h>
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#else
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#ifdef _AIX
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#pragma alloca
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#else
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#ifndef alloca
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char *alloca ();
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#endif
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#endif
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#endif
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#endif
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#endif
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"
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CL_LINK_CHECK([alloca], cl_cv_func_alloca,
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$decl, [char *p = (char *) alloca(1);],
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, [alloca_missing=1])dnl
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if test -n "$alloca_missing"; then
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# The SVR3 libPW and SVR4 libucb both contain incompatible functions
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# that cause trouble. Some versions do not even contain alloca or
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# contain a buggy version. If you still want to use their alloca,
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# use ar to extract alloca.o from them instead of compiling alloca.c.
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ALLOCA=alloca.${ac_objext}
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AC_DEFINE(NO_ALLOCA,,[need to link with an external alloca.o when using alloca()])
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fi
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AC_SUBST(ALLOCA)dnl
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])
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