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alloca: port to compilers that can optimize like GCC 4.6.0 * lib/alloca.c (find_stack_direction): New signature, taken from Autoconf git. This works with GCC 4.6.0. This code should never be used with GCC 4.6.0 itself, as GCC has alloca, but it might be used with other compilers that optimize as well as GCC 4.6.0 does. (alloca): Adjust to new signature. * m4/alloca.m4 (__AC_LIBOBJ_ALLOCA) [Autoconf version < 2.69]: New macro, which patches Autoconf in a similar way.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 20 Jun 2011 15:03:03 -0700
parents 662ae53d8d37
children 03e2cd1cbbe8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # alloca.m4 serial 12
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2 dnl Copyright (C) 2002-2004, 2006-2007, 2009-2011 Free Software Foundation,
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3 dnl Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 AC_DEFUN([gl_FUNC_ALLOCA],
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9 [
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10 AC_REQUIRE([AC_FUNC_ALLOCA])
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11 if test $ac_cv_func_alloca_works = no; then
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12 gl_PREREQ_ALLOCA
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13 fi
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14
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15 # Define an additional variable used in the Makefile substitution.
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16 if test $ac_cv_working_alloca_h = yes; then
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17 AC_CACHE_CHECK([for alloca as a compiler built-in], [gl_cv_rpl_alloca], [
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18 AC_EGREP_CPP([Need own alloca], [
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19 #if defined __GNUC__ || defined _AIX || defined _MSC_VER
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20 Need own alloca
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21 #endif
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22 ], [gl_cv_rpl_alloca=yes], [gl_cv_rpl_alloca=no])
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23 ])
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24 if test $gl_cv_rpl_alloca = yes; then
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25 dnl OK, alloca can be implemented through a compiler built-in.
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26 AC_DEFINE([HAVE_ALLOCA], [1],
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27 [Define to 1 if you have 'alloca' after including <alloca.h>,
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28 a header that may be supplied by this distribution.])
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29 ALLOCA_H=alloca.h
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30 else
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31 dnl alloca exists as a library function, i.e. it is slow and probably
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32 dnl a memory leak. Don't define HAVE_ALLOCA in this case.
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33 ALLOCA_H=
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34 fi
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35 else
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36 ALLOCA_H=alloca.h
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37 fi
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38 AC_SUBST([ALLOCA_H])
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39 AM_CONDITIONAL([GL_GENERATE_ALLOCA_H], [test -n "$ALLOCA_H"])
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40 ])
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41
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42 # Prerequisites of lib/alloca.c.
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43 # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA.
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44 AC_DEFUN([gl_PREREQ_ALLOCA], [:])
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45
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46 # This works around a bug in autoconf <= 2.68.
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47 # See <http://lists.gnu.org/archive/html/bug-gnulib/2011-06/msg00277.html>.
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48
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49 m4_version_prereq([2.69], [] ,[
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50
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51 # This is taken from the following Autoconf patch:
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52 # http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=6cd9f12520b0d6f76d3230d7565feba1ecf29497
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53
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54 # _AC_LIBOBJ_ALLOCA
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55 # -----------------
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56 # Set up the LIBOBJ replacement of `alloca'. Well, not exactly
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57 # AC_LIBOBJ since we actually set the output variable `ALLOCA'.
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58 # Nevertheless, for Automake, AC_LIBSOURCES it.
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59 m4_define([_AC_LIBOBJ_ALLOCA],
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60 [# The SVR3 libPW and SVR4 libucb both contain incompatible functions
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61 # that cause trouble. Some versions do not even contain alloca or
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62 # contain a buggy version. If you still want to use their alloca,
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63 # use ar to extract alloca.o from them instead of compiling alloca.c.
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64 AC_LIBSOURCES(alloca.c)
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65 AC_SUBST([ALLOCA], [\${LIBOBJDIR}alloca.$ac_objext])dnl
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66 AC_DEFINE(C_ALLOCA, 1, [Define to 1 if using `alloca.c'.])
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67
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68 AC_CACHE_CHECK(whether `alloca.c' needs Cray hooks, ac_cv_os_cray,
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69 [AC_EGREP_CPP(webecray,
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70 [#if defined CRAY && ! defined CRAY2
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71 webecray
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72 #else
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73 wenotbecray
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74 #endif
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75 ], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
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76 if test $ac_cv_os_cray = yes; then
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77 for ac_func in _getb67 GETB67 getb67; do
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78 AC_CHECK_FUNC($ac_func,
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79 [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,
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80 [Define to one of `_getb67', `GETB67',
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81 `getb67' for Cray-2 and Cray-YMP
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82 systems. This function is required for
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83 `alloca.c' support on those systems.])
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84 break])
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85 done
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86 fi
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87
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88 AC_CACHE_CHECK([stack direction for C alloca],
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89 [ac_cv_c_stack_direction],
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90 [AC_RUN_IFELSE([AC_LANG_SOURCE(
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91 [AC_INCLUDES_DEFAULT
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92 int
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93 find_stack_direction (int *addr, int depth)
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94 {
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95 int dir, dummy = 0;
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96 if (! addr)
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97 addr = &dummy;
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98 *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1;
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99 dir = depth ? find_stack_direction (addr, depth - 1) : 0;
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100 return dir + dummy;
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101 }
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102
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103 int
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104 main (int argc, char **argv)
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105 {
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106 return find_stack_direction (0, argc + !argv + 20) < 0;
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107 }])],
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108 [ac_cv_c_stack_direction=1],
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109 [ac_cv_c_stack_direction=-1],
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110 [ac_cv_c_stack_direction=0])])
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111 AH_VERBATIM([STACK_DIRECTION],
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112 [/* If using the C implementation of alloca, define if you know the
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113 direction of stack growth for your system; otherwise it will be
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114 automatically deduced at runtime.
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115 STACK_DIRECTION > 0 => grows toward higher addresses
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116 STACK_DIRECTION < 0 => grows toward lower addresses
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117 STACK_DIRECTION = 0 => direction of growth unknown */
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118 @%:@undef STACK_DIRECTION])dnl
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119 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
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120 ])# _AC_LIBOBJ_ALLOCA
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121 ])