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1 # ===========================================================================
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2 # https://www.gnu.org/software/autoconf-archive/ax_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 # AX_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 to link with them as well. For example, you might link with
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23 # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
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24 #
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25 # If you are only building threaded programs, you may wish to use these
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26 # variables in your default LIBS, CFLAGS, and CC:
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27 #
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28 # LIBS="$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, this macro 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 # Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
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37 # PTHREAD_PRIO_INHERIT symbol is defined when compiling with
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38 # PTHREAD_CFLAGS.
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39 #
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40 # ACTION-IF-FOUND is a list of shell commands to run if a threads library
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41 # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
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42 # is not found. If ACTION-IF-FOUND is not specified, the default action
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43 # will define HAVE_PTHREAD.
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44 #
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45 # Please let the authors know if this macro fails on any platform, or if
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46 # you have any other suggestions or comments. This macro was based on work
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47 # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
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48 # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
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49 # Alejandro Forero Cuervo to the autoconf macro repository. We are also
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50 # grateful for the helpful feedback of numerous users.
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51 #
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52 # Updated for Autoconf 2.68 by Daniel Richard G.
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53 #
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54 # LICENSE
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55 #
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56 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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57 # Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
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58 #
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59 # This program is free software: you can redistribute it and/or modify it
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60 # under the terms of the GNU General Public License as published by the
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61 # Free Software Foundation, either version 3 of the License, or (at your
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62 # option) any later version.
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63 #
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64 # This program is distributed in the hope that it will be useful, but
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65 # WITHOUT ANY WARRANTY; without even the implied warranty of
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66 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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67 # Public License for more details.
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68 #
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69 # You should have received a copy of the GNU General Public License along
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70 # with this program. If not, see <https://www.gnu.org/licenses/>.
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71 #
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72 # As a special exception, the respective Autoconf Macro's copyright owner
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73 # gives unlimited permission to copy, distribute and modify the configure
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74 # scripts that are the output of Autoconf when processing the Macro. You
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75 # need not follow the terms of the GNU General Public License when using
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76 # or distributing such scripts, even though portions of the text of the
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77 # Macro appear in them. The GNU General Public License (GPL) does govern
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78 # all other use of the material that constitutes the Autoconf Macro.
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79 #
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80 # This special exception to the GPL applies to versions of the Autoconf
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81 # Macro released by the Autoconf Archive. When you make and distribute a
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82 # modified version of the Autoconf Macro, you may extend this special
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83 # exception to the GPL to apply to your modified version as well.
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84
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85 #serial 24
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86
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87 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
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88 AC_DEFUN([AX_PTHREAD], [
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89 AC_REQUIRE([AC_CANONICAL_HOST])
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90 AC_REQUIRE([AC_PROG_CC])
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91 AC_REQUIRE([AC_PROG_SED])
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92 AC_LANG_PUSH([C])
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93 ax_pthread_ok=no
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94
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95 # We used to check for pthread.h first, but this fails if pthread.h
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96 # requires special compiler flags (e.g. on Tru64 or Sequent).
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97 # It gets checked for in the link test anyway.
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98
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99 # First of all, check if the user has set any of the PTHREAD_LIBS,
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100 # etcetera environment variables, and if threads linking works using
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101 # them:
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102 if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
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103 ax_pthread_save_CC="$CC"
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104 ax_pthread_save_CFLAGS="$CFLAGS"
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105 ax_pthread_save_LIBS="$LIBS"
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106 AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
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107 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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108 LIBS="$PTHREAD_LIBS $LIBS"
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109 AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
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110 AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
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111 AC_MSG_RESULT([$ax_pthread_ok])
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112 if test "x$ax_pthread_ok" = "xno"; then
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113 PTHREAD_LIBS=""
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114 PTHREAD_CFLAGS=""
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115 fi
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116 CC="$ax_pthread_save_CC"
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117 CFLAGS="$ax_pthread_save_CFLAGS"
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118 LIBS="$ax_pthread_save_LIBS"
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119 fi
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120
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121 # We must check for the threads library under a number of different
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122 # names; the ordering is very important because some systems
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123 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
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124 # libraries is broken (non-POSIX).
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125
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126 # Create a list of thread flags to try. Items starting with a "-" are
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127 # C compiler flags, and other items are library names, except for "none"
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128 # which indicates that we try without any flags at all, and "pthread-config"
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129 # which is a program returning the flags for the Pth emulation library.
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130
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131 ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
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132
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133 # The ordering *is* (sometimes) important. Some notes on the
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134 # individual items follow:
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135
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136 # pthreads: AIX (must check this before -lpthread)
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137 # none: in case threads are in libc; should be tried before -Kthread and
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138 # other compiler flags to prevent continual compiler warnings
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139 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
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140 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
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141 # (Note: HP C rejects this with "bad form for `-t' option")
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142 # -pthreads: Solaris/gcc (Note: HP C also rejects)
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143 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
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144 # doesn't hurt to check since this sometimes defines pthreads and
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145 # -D_REENTRANT too), HP C (must be checked before -lpthread, which
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146 # is present but should not be used directly; and before -mthreads,
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147 # because the compiler interprets this as "-mt" + "-hreads")
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148 # -mthreads: Mingw32/gcc, Lynx/gcc
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149 # pthread: Linux, etcetera
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150 # --thread-safe: KAI C++
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151 # pthread-config: use pthread-config program (for GNU Pth library)
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152
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153 case $host_os in
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154
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155 freebsd*)
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156
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157 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
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158 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
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159
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160 ax_pthread_flags="-kthread lthread $ax_pthread_flags"
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161 ;;
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162
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163 hpux*)
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164
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165 # From the cc(1) man page: "[-mt] Sets various -D flags to enable
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166 # multi-threading and also sets -lpthread."
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167
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168 ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
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169 ;;
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170
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171 openedition*)
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172
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173 # IBM z/OS requires a feature-test macro to be defined in order to
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174 # enable POSIX threads at all, so give the user a hint if this is
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175 # not set. (We don't define these ourselves, as they can affect
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176 # other portions of the system API in unpredictable ways.)
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177
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178 AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
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179 [
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180 # if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
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181 AX_PTHREAD_ZOS_MISSING
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182 # endif
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183 ],
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184 [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
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185 ;;
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186
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187 solaris*)
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188
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189 # On Solaris (at least, for some versions), libc contains stubbed
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190 # (non-functional) versions of the pthreads routines, so link-based
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191 # tests will erroneously succeed. (N.B.: The stubs are missing
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192 # pthread_cleanup_push, or rather a function called by this macro,
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193 # so we could check for that, but who knows whether they'll stub
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194 # that too in a future libc.) So we'll check first for the
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195 # standard Solaris way of linking pthreads (-mt -lpthread).
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196
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197 ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
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198 ;;
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199 esac
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200
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201 # GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
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202
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203 AS_IF([test "x$GCC" = "xyes"],
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204 [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
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205
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206 # The presence of a feature test macro requesting re-entrant function
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207 # definitions is, on some systems, a strong hint that pthreads support is
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208 # correctly enabled
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209
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210 case $host_os in
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211 darwin* | hpux* | linux* | osf* | solaris*)
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212 ax_pthread_check_macro="_REENTRANT"
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213 ;;
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214
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215 aix*)
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216 ax_pthread_check_macro="_THREAD_SAFE"
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217 ;;
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218
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219 *)
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220 ax_pthread_check_macro="--"
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221 ;;
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222 esac
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223 AS_IF([test "x$ax_pthread_check_macro" = "x--"],
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224 [ax_pthread_check_cond=0],
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225 [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
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226
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227 # Are we compiling with Clang?
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228
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229 AC_CACHE_CHECK([whether $CC is Clang],
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230 [ax_cv_PTHREAD_CLANG],
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231 [ax_cv_PTHREAD_CLANG=no
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232 # Note that Autoconf sets GCC=yes for Clang as well as GCC
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233 if test "x$GCC" = "xyes"; then
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234 AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
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235 [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
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236 # if defined(__clang__) && defined(__llvm__)
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237 AX_PTHREAD_CC_IS_CLANG
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238 # endif
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239 ],
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240 [ax_cv_PTHREAD_CLANG=yes])
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241 fi
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242 ])
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243 ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
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244
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245 ax_pthread_clang_warning=no
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246
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247 # Clang needs special handling, because older versions handle the -pthread
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248 # option in a rather... idiosyncratic way
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249
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250 if test "x$ax_pthread_clang" = "xyes"; then
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251
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252 # Clang takes -pthread; it has never supported any other flag
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253
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254 # (Note 1: This will need to be revisited if a system that Clang
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255 # supports has POSIX threads in a separate library. This tends not
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256 # to be the way of modern systems, but it's conceivable.)
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257
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258 # (Note 2: On some systems, notably Darwin, -pthread is not needed
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259 # to get POSIX threads support; the API is always present and
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260 # active. We could reasonably leave PTHREAD_CFLAGS empty. But
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261 # -pthread does define _REENTRANT, and while the Darwin headers
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262 # ignore this macro, third-party headers might not.)
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263
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264 PTHREAD_CFLAGS="-pthread"
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265 PTHREAD_LIBS=
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266
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267 ax_pthread_ok=yes
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268
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269 # However, older versions of Clang make a point of warning the user
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270 # that, in an invocation where only linking and no compilation is
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271 # taking place, the -pthread option has no effect ("argument unused
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272 # during compilation"). They expect -pthread to be passed in only
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273 # when source code is being compiled.
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274 #
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275 # Problem is, this is at odds with the way Automake and most other
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276 # C build frameworks function, which is that the same flags used in
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277 # compilation (CFLAGS) are also used in linking. Many systems
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278 # supported by AX_PTHREAD require exactly this for POSIX threads
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279 # support, and in fact it is often not straightforward to specify a
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280 # flag that is used only in the compilation phase and not in
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281 # linking. Such a scenario is extremely rare in practice.
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282 #
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283 # Even though use of the -pthread flag in linking would only print
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284 # a warning, this can be a nuisance for well-run software projects
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285 # that build with -Werror. So if the active version of Clang has
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286 # this misfeature, we search for an option to squash it.
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287
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288 AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
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289 [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
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290 [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
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291 # Create an alternate version of $ac_link that compiles and
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292 # links in two steps (.c -> .o, .o -> exe) instead of one
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293 # (.c -> exe), because the warning occurs only in the second
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294 # step
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295 ax_pthread_save_ac_link="$ac_link"
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296 ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
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297 ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
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298 ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
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299 ax_pthread_save_CFLAGS="$CFLAGS"
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300 for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
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301 AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
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302 CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
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303 ac_link="$ax_pthread_save_ac_link"
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304 AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
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305 [ac_link="$ax_pthread_2step_ac_link"
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306 AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
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307 [break])
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308 ])
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309 done
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310 ac_link="$ax_pthread_save_ac_link"
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311 CFLAGS="$ax_pthread_save_CFLAGS"
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312 AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
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313 ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
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314 ])
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315
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316 case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
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317 no | unknown) ;;
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318 *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
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319 esac
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320
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321 fi # $ax_pthread_clang = yes
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322
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323 if test "x$ax_pthread_ok" = "xno"; then
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324 for ax_pthread_try_flag in $ax_pthread_flags; do
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325
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326 case $ax_pthread_try_flag in
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327 none)
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328 AC_MSG_CHECKING([whether pthreads work without any flags])
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329 ;;
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330
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331 -mt,pthread)
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332 AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
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333 PTHREAD_CFLAGS="-mt"
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334 PTHREAD_LIBS="-lpthread"
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335 ;;
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336
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337 -*)
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338 AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
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339 PTHREAD_CFLAGS="$ax_pthread_try_flag"
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340 ;;
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341
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342 pthread-config)
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343 AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
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344 AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
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345 PTHREAD_CFLAGS="`pthread-config --cflags`"
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346 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
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347 ;;
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348
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349 *)
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350 AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
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351 PTHREAD_LIBS="-l$ax_pthread_try_flag"
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352 ;;
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353 esac
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354
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355 ax_pthread_save_CFLAGS="$CFLAGS"
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356 ax_pthread_save_LIBS="$LIBS"
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357 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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358 LIBS="$PTHREAD_LIBS $LIBS"
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359
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360 # Check for various functions. We must include pthread.h,
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361 # since some functions may be macros. (On the Sequent, we
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362 # need a special flag -Kthread to make this header compile.)
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363 # We check for pthread_join because it is in -lpthread on IRIX
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364 # while pthread_create is in libc. We check for pthread_attr_init
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365 # due to DEC craziness with -lpthreads. We check for
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366 # pthread_cleanup_push because it is one of the few pthread
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367 # functions on Solaris that doesn't have a non-functional libc stub.
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368 # We try pthread_create on general principles.
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369
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370 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
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371 # if $ax_pthread_check_cond
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372 # error "$ax_pthread_check_macro must be defined"
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373 # endif
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374 static void routine(void *a) { a = 0; }
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375 static void *start_routine(void *a) { return a; }],
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376 [pthread_t th; pthread_attr_t attr;
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377 pthread_create(&th, 0, start_routine, 0);
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378 pthread_join(th, 0);
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379 pthread_attr_init(&attr);
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380 pthread_cleanup_push(routine, 0);
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381 pthread_cleanup_pop(0) /* ; */])],
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382 [ax_pthread_ok=yes],
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383 [])
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384
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385 CFLAGS="$ax_pthread_save_CFLAGS"
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386 LIBS="$ax_pthread_save_LIBS"
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387
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388 AC_MSG_RESULT([$ax_pthread_ok])
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389 AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
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390
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391 PTHREAD_LIBS=""
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392 PTHREAD_CFLAGS=""
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393 done
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394 fi
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395
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396 # Various other checks:
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397 if test "x$ax_pthread_ok" = "xyes"; then
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398 ax_pthread_save_CFLAGS="$CFLAGS"
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399 ax_pthread_save_LIBS="$LIBS"
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400 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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401 LIBS="$PTHREAD_LIBS $LIBS"
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402
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403 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
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404 AC_CACHE_CHECK([for joinable pthread attribute],
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405 [ax_cv_PTHREAD_JOINABLE_ATTR],
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406 [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
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407 for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
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408 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
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409 [int attr = $ax_pthread_attr; return attr /* ; */])],
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410 [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
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411 [])
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412 done
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413 ])
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414 AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
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415 test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
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416 test "x$ax_pthread_joinable_attr_defined" != "xyes"],
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417 [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
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418 [$ax_cv_PTHREAD_JOINABLE_ATTR],
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419 [Define to necessary symbol if this constant
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420 uses a non-standard name on your system.])
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421 ax_pthread_joinable_attr_defined=yes
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422 ])
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423
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424 AC_CACHE_CHECK([whether more special flags are required for pthreads],
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425 [ax_cv_PTHREAD_SPECIAL_FLAGS],
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426 [ax_cv_PTHREAD_SPECIAL_FLAGS=no
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427 case $host_os in
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428 solaris*)
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429 ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
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430 ;;
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431 esac
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432 ])
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433 AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
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434 test "x$ax_pthread_special_flags_added" != "xyes"],
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435 [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
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436 ax_pthread_special_flags_added=yes])
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437
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438 AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
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439 [ax_cv_PTHREAD_PRIO_INHERIT],
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440 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
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441 [[int i = PTHREAD_PRIO_INHERIT;]])],
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442 [ax_cv_PTHREAD_PRIO_INHERIT=yes],
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443 [ax_cv_PTHREAD_PRIO_INHERIT=no])
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444 ])
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445 AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
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446 test "x$ax_pthread_prio_inherit_defined" != "xyes"],
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447 [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
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448 ax_pthread_prio_inherit_defined=yes
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449 ])
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450
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451 CFLAGS="$ax_pthread_save_CFLAGS"
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452 LIBS="$ax_pthread_save_LIBS"
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453
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454 # More AIX lossage: compile with *_r variant
|
|
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455 if test "x$GCC" != "xyes"; then
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456 case $host_os in
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457 aix*)
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458 AS_CASE(["x/$CC"],
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459 [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
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460 [#handle absolute path differently from PATH based program lookup
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461 AS_CASE(["x$CC"],
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462 [x/*],
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|
463 [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
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464 [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
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465 ;;
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|
|
466 esac
|
|
|
467 fi
|
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|
468 fi
|
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469
|
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|
470 test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
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471
|
|
|
472 AC_SUBST([PTHREAD_LIBS])
|
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|
473 AC_SUBST([PTHREAD_CFLAGS])
|
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|
474 AC_SUBST([PTHREAD_CC])
|
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475
|
|
|
476 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
|
|
|
477 if test "x$ax_pthread_ok" = "xyes"; then
|
|
|
478 ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
|
|
|
479 :
|
|
|
480 else
|
|
|
481 ax_pthread_ok=no
|
|
|
482 $2
|
|
|
483 fi
|
|
|
484 AC_LANG_POP
|
|
|
485 ])dnl AX_PTHREAD
|
