Mercurial > syslog2iptables
annotate m4/acx_pthread.m4 @ 64:4b147494fc64
Added tag stable-1-0-16 for changeset 60f59936fabb
author | Carl Byington <carl@five-ten-sg.com> |
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date | Sat, 19 Dec 2015 10:25:11 -0800 |
parents | 9e9f09cf411c |
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1 ##### http://autoconf-archive.cryp.to/acx_pthread.html |
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2 # |
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3 # SYNOPSIS |
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4 # |
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5 # ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
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6 # |
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7 # DESCRIPTION |
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8 # |
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9 # This macro figures out how to build C programs using POSIX threads. |
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10 # It sets the PTHREAD_LIBS output variable to the threads library and |
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11 # linker flags, and the PTHREAD_CFLAGS output variable to any special |
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12 # C compiler flags that are needed. (The user can also force certain |
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13 # compiler flags/libs to be tested by setting these environment |
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14 # variables.) |
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15 # |
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16 # Also sets PTHREAD_CC to any special C compiler that is needed for |
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17 # multi-threaded programs (defaults to the value of CC otherwise). |
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18 # (This is necessary on AIX to use the special cc_r compiler alias.) |
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19 # |
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20 # NOTE: You are assumed to not only compile your program with these |
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21 # flags, but also link it with them as well. e.g. you should link |
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22 # with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS |
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23 # $LIBS |
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24 # |
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25 # If you are only building threads programs, you may wish to use |
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26 # these variables in your default LIBS, CFLAGS, and CC: |
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27 # |
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28 # LIBS="$PTHREAD_LIBS $LIBS" |
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29 # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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30 # CC="$PTHREAD_CC" |
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31 # |
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32 # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute |
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33 # constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to |
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34 # that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX). |
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35 # |
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36 # ACTION-IF-FOUND is a list of shell commands to run if a threads |
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37 # library is found, and ACTION-IF-NOT-FOUND is a list of commands to |
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38 # run it if it is not found. If ACTION-IF-FOUND is not specified, the |
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39 # default action will define HAVE_PTHREAD. |
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40 # |
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41 # Please let the authors know if this macro fails on any platform, or |
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42 # if you have any other suggestions or comments. This macro was based |
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43 # on work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) |
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44 # (with help from M. Frigo), as well as ac_pthread and hb_pthread |
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45 # macros posted by Alejandro Forero Cuervo to the autoconf macro |
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46 # repository. We are also grateful for the helpful feedback of |
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47 # numerous users. |
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48 # |
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49 # LAST MODIFICATION |
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50 # |
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51 # 2006-05-29 |
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52 # |
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53 # COPYLEFT |
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54 # |
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55 # Copyright (c) 2006 Steven G. Johnson <stevenj@alum.mit.edu> |
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56 # |
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57 # This program is free software; you can redistribute it and/or |
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58 # modify it under the terms of the GNU General Public License as |
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59 # published by the Free Software Foundation; either version 2 of the |
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60 # License, or (at your option) any later version. |
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61 # |
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62 # This program is distributed in the hope that it will be useful, but |
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63 # WITHOUT ANY WARRANTY; without even the implied warranty of |
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64 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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65 # General Public License for more details. |
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66 # |
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67 # You should have received a copy of the GNU General Public License |
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68 # along with this program; if not, write to the Free Software |
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69 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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70 # 02111-1307, USA. |
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71 # |
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72 # As a special exception, the respective Autoconf Macro's copyright |
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73 # owner gives unlimited permission to copy, distribute and modify the |
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74 # configure scripts that are the output of Autoconf when processing |
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75 # the Macro. You need not follow the terms of the GNU General Public |
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76 # License when using or distributing such scripts, even though |
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77 # portions of the text of the Macro appear in them. The GNU General |
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78 # Public License (GPL) does govern all other use of the material that |
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79 # constitutes the Autoconf Macro. |
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80 # |
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81 # This special exception to the GPL applies to versions of the |
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82 # Autoconf Macro released by the Autoconf Macro Archive. When you |
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83 # make and distribute a modified version of the Autoconf Macro, you |
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84 # may extend this special exception to the GPL to apply to your |
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85 # modified version as well. |
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86 |
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87 AC_DEFUN([ACX_PTHREAD], [ |
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88 AC_REQUIRE([AC_CANONICAL_HOST]) |
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89 AC_LANG_SAVE |
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90 AC_LANG_C |
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91 acx_pthread_ok=no |
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92 |
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93 # We used to check for pthread.h first, but this fails if pthread.h |
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94 # requires special compiler flags (e.g. on True64 or Sequent). |
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95 # It gets checked for in the link test anyway. |
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96 |
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97 # First of all, check if the user has set any of the PTHREAD_LIBS, |
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98 # etcetera environment variables, and if threads linking works using |
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99 # them: |
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100 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then |
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101 save_CFLAGS="$CFLAGS" |
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102 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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103 save_LIBS="$LIBS" |
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104 LIBS="$PTHREAD_LIBS $LIBS" |
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105 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) |
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106 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) |
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107 AC_MSG_RESULT($acx_pthread_ok) |
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108 if test x"$acx_pthread_ok" = xno; then |
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109 PTHREAD_LIBS="" |
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110 PTHREAD_CFLAGS="" |
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111 fi |
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112 LIBS="$save_LIBS" |
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113 CFLAGS="$save_CFLAGS" |
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114 fi |
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115 |
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116 # We must check for the threads library under a number of different |
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117 # names; the ordering is very important because some systems |
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118 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
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119 # libraries is broken (non-POSIX). |
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120 |
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121 # Create a list of thread flags to try. Items starting with a "-" are |
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122 # C compiler flags, and other items are library names, except for "none" |
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123 # which indicates that we try without any flags at all, and "pthread-config" |
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124 # which is a program returning the flags for the Pth emulation library. |
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125 |
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126 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
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127 |
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128 # The ordering *is* (sometimes) important. Some notes on the |
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129 # individual items follow: |
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130 |
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131 # pthreads: AIX (must check this before -lpthread) |
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132 # none: in case threads are in libc; should be tried before -Kthread and |
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133 # other compiler flags to prevent continual compiler warnings |
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134 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
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135 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
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136 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
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137 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) |
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138 # -pthreads: Solaris/gcc |
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139 # -mthreads: Mingw32/gcc, Lynx/gcc |
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140 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
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141 # doesn't hurt to check since this sometimes defines pthreads too; |
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142 # also defines -D_REENTRANT) |
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143 # ... -mt is also the pthreads flag for HP/aCC |
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144 # pthread: Linux, etcetera |
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145 # --thread-safe: KAI C++ |
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146 # pthread-config: use pthread-config program (for GNU Pth library) |
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147 |
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148 case "${host_cpu}-${host_os}" in |
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149 *solaris*) |
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150 |
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151 # On Solaris (at least, for some versions), libc contains stubbed |
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152 # (non-functional) versions of the pthreads routines, so link-based |
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153 # tests will erroneously succeed. (We need to link with -pthreads/-mt/ |
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154 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather |
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155 # a function called by this macro, so we could check for that, but |
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156 # who knows whether they'll stub that too in a future libc.) So, |
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157 # we'll just look for -pthreads and -lpthread first: |
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158 |
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159 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" |
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160 ;; |
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161 esac |
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162 |
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163 if test x"$acx_pthread_ok" = xno; then |
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164 for flag in $acx_pthread_flags; do |
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165 |
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166 case $flag in |
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167 none) |
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168 AC_MSG_CHECKING([whether pthreads work without any flags]) |
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169 ;; |
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170 |
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171 -*) |
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172 AC_MSG_CHECKING([whether pthreads work with $flag]) |
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173 PTHREAD_CFLAGS="$flag" |
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174 ;; |
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175 |
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176 pthread-config) |
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177 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) |
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178 if test x"$acx_pthread_config" = xno; then continue; fi |
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179 PTHREAD_CFLAGS="`pthread-config --cflags`" |
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180 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
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181 ;; |
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182 |
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183 *) |
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184 AC_MSG_CHECKING([for the pthreads library -l$flag]) |
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185 PTHREAD_LIBS="-l$flag" |
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186 ;; |
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187 esac |
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188 |
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189 save_LIBS="$LIBS" |
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190 save_CFLAGS="$CFLAGS" |
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191 LIBS="$PTHREAD_LIBS $LIBS" |
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192 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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193 |
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194 # Check for various functions. We must include pthread.h, |
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195 # since some functions may be macros. (On the Sequent, we |
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196 # need a special flag -Kthread to make this header compile.) |
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197 # We check for pthread_join because it is in -lpthread on IRIX |
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198 # while pthread_create is in libc. We check for pthread_attr_init |
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199 # due to DEC craziness with -lpthreads. We check for |
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200 # pthread_cleanup_push because it is one of the few pthread |
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201 # functions on Solaris that doesn't have a non-functional libc stub. |
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202 # We try pthread_create on general principles. |
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203 AC_TRY_LINK([#include <pthread.h>], |
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204 [pthread_t th; pthread_join(th, 0); |
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205 pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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206 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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207 [acx_pthread_ok=yes]) |
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208 |
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209 LIBS="$save_LIBS" |
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210 CFLAGS="$save_CFLAGS" |
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211 |
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212 AC_MSG_RESULT($acx_pthread_ok) |
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213 if test "x$acx_pthread_ok" = xyes; then |
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214 break; |
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215 fi |
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216 |
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217 PTHREAD_LIBS="" |
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218 PTHREAD_CFLAGS="" |
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219 done |
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220 fi |
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221 |
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222 # Various other checks: |
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223 if test "x$acx_pthread_ok" = xyes; then |
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224 save_LIBS="$LIBS" |
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225 LIBS="$PTHREAD_LIBS $LIBS" |
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226 save_CFLAGS="$CFLAGS" |
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227 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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228 |
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229 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
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230 AC_MSG_CHECKING([for joinable pthread attribute]) |
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231 attr_name=unknown |
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232 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
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233 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], |
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234 [attr_name=$attr; break]) |
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235 done |
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236 AC_MSG_RESULT($attr_name) |
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237 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then |
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238 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, |
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239 [Define to necessary symbol if this constant |
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240 uses a non-standard name on your system.]) |
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241 fi |
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242 |
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243 AC_MSG_CHECKING([if more special flags are required for pthreads]) |
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244 flag=no |
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245 case "${host_cpu}-${host_os}" in |
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246 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; |
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247 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; |
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248 esac |
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249 AC_MSG_RESULT(${flag}) |
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250 if test "x$flag" != xno; then |
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251 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" |
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252 fi |
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253 |
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254 LIBS="$save_LIBS" |
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255 CFLAGS="$save_CFLAGS" |
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256 |
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257 # More AIX lossage: must compile with xlc_r or cc_r |
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258 if test x"$GCC" != xyes; then |
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259 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) |
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260 else |
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261 PTHREAD_CC=$CC |
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262 fi |
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263 else |
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264 PTHREAD_CC="$CC" |
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265 fi |
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266 |
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267 AC_SUBST(PTHREAD_LIBS) |
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268 AC_SUBST(PTHREAD_CFLAGS) |
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269 AC_SUBST(PTHREAD_CC) |
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270 |
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271 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
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272 if test x"$acx_pthread_ok" = xyes; then |
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273 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) |
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274 : |
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275 else |
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276 acx_pthread_ok=no |
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277 $2 |
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278 fi |
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279 AC_LANG_RESTORE |
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280 ])dnl ACX_PTHREAD |