| 1 | # alloca.m4 serial 5
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| 2 | dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN([gl_FUNC_ALLOCA],
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| 8 | [
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| 9 | dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
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| 10 | AC_REQUIRE([AC_PROG_CPP])
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| 11 | AC_REQUIRE([AC_PROG_EGREP])
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| 12 |
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| 13 | AC_REQUIRE([AC_FUNC_ALLOCA])
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| 14 | if test $ac_cv_func_alloca_works = no; then
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| 15 | gl_PREREQ_ALLOCA
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| 16 | fi
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| 17 |
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| 18 | # Define an additional variable used in the Makefile substitution.
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| 19 | if test $ac_cv_working_alloca_h = yes; then
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| 20 | AC_EGREP_CPP([Need own alloca], [
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| 21 | #if defined __GNUC__ || defined _AIX || defined _MSC_VER
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| 22 | Need own alloca
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| 23 | #endif
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| 24 | ],
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| 25 | [AC_DEFINE(HAVE_ALLOCA, 1,
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| 26 | [Define to 1 if you have `alloca' after including <alloca.h>,
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| 27 | a header that may be supplied by this distribution.])
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| 28 | ALLOCA_H=alloca.h],
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| 29 | [ALLOCA_H=])
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| 30 | else
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| 31 | ALLOCA_H=alloca.h
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| 32 | fi
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| 33 | AC_SUBST([ALLOCA_H])
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| 34 |
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| 35 | AC_DEFINE(HAVE_ALLOCA_H, 1,
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| 36 | [Define HAVE_ALLOCA_H for backward compatibility with older code
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| 37 | that includes <alloca.h> only if HAVE_ALLOCA_H is defined.])
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| 38 | ])
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| 39 |
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| 40 | # Prerequisites of lib/alloca.c.
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| 41 | # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA.
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| 42 | AC_DEFUN([gl_PREREQ_ALLOCA], [:])
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