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1 # ===========================================================================
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2 # http://autoconf-archive.cryp.to/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
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