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1 # =========================================================================== |
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2 # http://www.nongnu.org/autoconf-archive/acx_pthread.html |
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3 # =========================================================================== |
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4 # |
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5 # SYNOPSIS |
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6 # |
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7 # ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
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8 # |
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9 # DESCRIPTION |
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10 # |
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11 # This macro figures out how to build C programs using POSIX threads. It |
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12 # sets the PTHREAD_LIBS output variable to the threads library and linker |
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13 # flags, and the PTHREAD_CFLAGS output variable to any special C compiler |
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14 # flags that are needed. (The user can also force certain compiler |
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15 # flags/libs to be tested by setting these environment variables.) |
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16 # |
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17 # Also sets PTHREAD_CC to any special C compiler that is needed for |
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18 # multi-threaded programs (defaults to the value of CC otherwise). (This |
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19 # is necessary on AIX to use the special cc_r compiler alias.) |
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20 # |
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21 # NOTE: You are assumed to not only compile your program with these flags, |
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22 # but also link it with them as well. e.g. you should link with |
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23 # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
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24 # |
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25 # If you are only building threads programs, you may wish to use these |
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26 # variables in your default LIBS, CFLAGS, and CC: |
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27 # |
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28 # LIBS="$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 constant |
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33 # has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name |
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34 # (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 library |
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37 # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it |
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38 # is not found. If ACTION-IF-FOUND is not specified, the default action |
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39 # 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 if |
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42 # you have any other suggestions or comments. This macro was based on work |
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43 # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help |
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44 # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by |
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45 # Alejandro Forero Cuervo to the autoconf macro repository. We are also |
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46 # grateful for the helpful feedback of numerous users. |
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47 # |
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48 # LICENSE |
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49 # |
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50 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> |
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51 # |
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52 # This program is free software: you can redistribute it and/or modify it |
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53 # under the terms of the GNU General Public License as published by the |
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54 # Free Software Foundation, either version 3 of the License, or (at your |
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55 # option) any later version. |
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56 # |
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57 # This program is distributed in the hope that it will be useful, but |
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58 # WITHOUT ANY WARRANTY; without even the implied warranty of |
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59 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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60 # Public License for more details. |
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61 # |
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62 # You should have received a copy of the GNU General Public License along |
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63 # with this program. If not, see <http://www.gnu.org/licenses/>. |
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64 # |
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65 # As a special exception, the respective Autoconf Macro's copyright owner |
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66 # gives unlimited permission to copy, distribute and modify the configure |
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67 # scripts that are the output of Autoconf when processing the Macro. You |
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68 # need not follow the terms of the GNU General Public License when using |
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69 # or distributing such scripts, even though portions of the text of the |
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70 # Macro appear in them. The GNU General Public License (GPL) does govern |
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71 # all other use of the material that constitutes the Autoconf Macro. |
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72 # |
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73 # This special exception to the GPL applies to versions of the Autoconf |
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74 # Macro released by the Autoconf Archive. When you make and distribute a |
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75 # modified version of the Autoconf Macro, you may extend this special |
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76 # exception to the GPL to apply to your modified version as well. |
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77 |
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78 AC_DEFUN([ACX_PTHREAD], [ |
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79 AC_REQUIRE([AC_CANONICAL_HOST]) |
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80 AC_LANG_SAVE |
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81 AC_LANG_C |
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82 acx_pthread_ok=no |
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83 |
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84 # We used to check for pthread.h first, but this fails if pthread.h |
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85 # requires special compiler flags (e.g. on True64 or Sequent). |
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86 # It gets checked for in the link test anyway. |
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87 |
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88 # First of all, check if the user has set any of the PTHREAD_LIBS, |
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89 # etcetera environment variables, and if threads linking works using |
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90 # them: |
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91 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then |
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92 save_CFLAGS="$CFLAGS" |
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93 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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94 save_LIBS="$LIBS" |
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95 LIBS="$PTHREAD_LIBS $LIBS" |
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96 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) |
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97 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) |
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98 AC_MSG_RESULT($acx_pthread_ok) |
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99 if test x"$acx_pthread_ok" = xno; then |
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100 PTHREAD_LIBS="" |
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101 PTHREAD_CFLAGS="" |
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102 fi |
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103 LIBS="$save_LIBS" |
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104 CFLAGS="$save_CFLAGS" |
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105 fi |
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106 |
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107 # We must check for the threads library under a number of different |
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108 # names; the ordering is very important because some systems |
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109 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
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110 # libraries is broken (non-POSIX). |
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111 |
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112 # Create a list of thread flags to try. Items starting with a "-" are |
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113 # C compiler flags, and other items are library names, except for "none" |
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114 # which indicates that we try without any flags at all, and "pthread-config" |
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115 # which is a program returning the flags for the Pth emulation library. |
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116 |
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117 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
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118 |
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119 # The ordering *is* (sometimes) important. Some notes on the |
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120 # individual items follow: |
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121 |
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122 # pthreads: AIX (must check this before -lpthread) |
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123 # none: in case threads are in libc; should be tried before -Kthread and |
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124 # other compiler flags to prevent continual compiler warnings |
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125 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
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126 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
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127 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
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128 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) |
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129 # -pthreads: Solaris/gcc |
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130 # -mthreads: Mingw32/gcc, Lynx/gcc |
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131 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
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132 # doesn't hurt to check since this sometimes defines pthreads too; |
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133 # also defines -D_REENTRANT) |
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134 # ... -mt is also the pthreads flag for HP/aCC |
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135 # pthread: Linux, etcetera |
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136 # --thread-safe: KAI C++ |
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137 # pthread-config: use pthread-config program (for GNU Pth library) |
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138 |
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139 case "${host_cpu}-${host_os}" in |
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140 *solaris*) |
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141 |
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142 # On Solaris (at least, for some versions), libc contains stubbed |
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143 # (non-functional) versions of the pthreads routines, so link-based |
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144 # tests will erroneously succeed. (We need to link with -pthreads/-mt/ |
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145 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather |
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146 # a function called by this macro, so we could check for that, but |
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147 # who knows whether they'll stub that too in a future libc.) So, |
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148 # we'll just look for -pthreads and -lpthread first: |
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149 |
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150 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" |
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151 ;; |
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152 esac |
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153 |
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154 if test x"$acx_pthread_ok" = xno; then |
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155 for flag in $acx_pthread_flags; do |
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156 |
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157 case $flag in |
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158 none) |
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159 AC_MSG_CHECKING([whether pthreads work without any flags]) |
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160 ;; |
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161 |
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162 -*) |
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163 AC_MSG_CHECKING([whether pthreads work with $flag]) |
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164 PTHREAD_CFLAGS="$flag" |
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165 ;; |
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166 |
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167 pthread-config) |
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168 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) |
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169 if test x"$acx_pthread_config" = xno; then continue; fi |
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170 PTHREAD_CFLAGS="`pthread-config --cflags`" |
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171 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
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172 ;; |
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173 |
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174 *) |
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175 AC_MSG_CHECKING([for the pthreads library -l$flag]) |
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176 PTHREAD_LIBS="-l$flag" |
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177 ;; |
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178 esac |
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179 |
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180 save_LIBS="$LIBS" |
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181 save_CFLAGS="$CFLAGS" |
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182 LIBS="$PTHREAD_LIBS $LIBS" |
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183 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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184 |
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185 # Check for various functions. We must include pthread.h, |
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186 # since some functions may be macros. (On the Sequent, we |
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187 # need a special flag -Kthread to make this header compile.) |
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188 # We check for pthread_join because it is in -lpthread on IRIX |
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189 # while pthread_create is in libc. We check for pthread_attr_init |
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190 # due to DEC craziness with -lpthreads. We check for |
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191 # pthread_cleanup_push because it is one of the few pthread |
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192 # functions on Solaris that doesn't have a non-functional libc stub. |
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193 # We try pthread_create on general principles. |
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194 AC_TRY_LINK([#include <pthread.h>], |
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195 [pthread_t th; pthread_join(th, 0); |
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196 pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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197 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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198 [acx_pthread_ok=yes]) |
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199 |
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200 LIBS="$save_LIBS" |
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201 CFLAGS="$save_CFLAGS" |
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202 |
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203 AC_MSG_RESULT($acx_pthread_ok) |
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204 if test "x$acx_pthread_ok" = xyes; then |
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205 break; |
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206 fi |
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207 |
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208 PTHREAD_LIBS="" |
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209 PTHREAD_CFLAGS="" |
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210 done |
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211 fi |
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212 |
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213 # Various other checks: |
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214 if test "x$acx_pthread_ok" = xyes; then |
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215 save_LIBS="$LIBS" |
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216 LIBS="$PTHREAD_LIBS $LIBS" |
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217 save_CFLAGS="$CFLAGS" |
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218 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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219 |
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220 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
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221 AC_MSG_CHECKING([for joinable pthread attribute]) |
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222 attr_name=unknown |
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223 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
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224 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], |
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225 [attr_name=$attr; break]) |
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226 done |
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227 AC_MSG_RESULT($attr_name) |
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228 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then |
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229 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, |
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230 [Define to necessary symbol if this constant |
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231 uses a non-standard name on your system.]) |
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232 fi |
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233 |
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234 AC_MSG_CHECKING([if more special flags are required for pthreads]) |
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235 flag=no |
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236 case "${host_cpu}-${host_os}" in |
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237 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; |
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238 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; |
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239 esac |
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240 AC_MSG_RESULT(${flag}) |
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241 if test "x$flag" != xno; then |
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242 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" |
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243 fi |
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244 |
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245 LIBS="$save_LIBS" |
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246 CFLAGS="$save_CFLAGS" |
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247 |
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248 # More AIX lossage: must compile with xlc_r or cc_r |
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249 if test x"$GCC" != xyes; then |
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250 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) |
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251 else |
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252 PTHREAD_CC=$CC |
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253 fi |
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254 else |
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255 PTHREAD_CC="$CC" |
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256 fi |
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257 |
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258 AC_SUBST(PTHREAD_LIBS) |
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259 AC_SUBST(PTHREAD_CFLAGS) |
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260 AC_SUBST(PTHREAD_CC) |
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261 |
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262 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
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263 if test x"$acx_pthread_ok" = xyes; then |
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264 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) |
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265 : |
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266 else |
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267 acx_pthread_ok=no |
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268 $2 |
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269 fi |
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270 AC_LANG_RESTORE |
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271 ])dnl ACX_PTHREAD |
