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annotate m4/acx_pthread.m4 @ 77:c6ba792f1a9a

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author Carl Byington <carl@five-ten-sg.com>
date Wed, 15 Jul 2020 13:58:42 -0700
parents 9e9f09cf411c
children
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1 ##### http://autoconf-archive.cryp.to/acx_pthread.html
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2 #
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3 # SYNOPSIS
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4 #
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5 # ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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6 #
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7 # DESCRIPTION
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8 #
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9 # This macro figures out how to build C programs using POSIX threads.
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10 # It sets the PTHREAD_LIBS output variable to the threads library and
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11 # linker flags, and the PTHREAD_CFLAGS output variable to any special
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12 # C compiler flags that are needed. (The user can also force certain
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13 # compiler flags/libs to be tested by setting these environment
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14 # variables.)
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15 #
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16 # Also sets PTHREAD_CC to any special C compiler that is needed for
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17 # multi-threaded programs (defaults to the value of CC otherwise).
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18 # (This is necessary on AIX to use the special cc_r compiler alias.)
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19 #
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20 # NOTE: You are assumed to not only compile your program with these
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21 # flags, but also link it with them as well. e.g. you should link
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22 # with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
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23 # $LIBS
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24 #
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25 # If you are only building threads programs, you may wish to use
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26 # these variables in your default LIBS, CFLAGS, and CC:
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27 #
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28 # LIBS="$PTHREAD_LIBS $LIBS"
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29 # CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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30 # CC="$PTHREAD_CC"
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31 #
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32 # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
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33 # constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
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34 # that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
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35 #
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36 # ACTION-IF-FOUND is a list of shell commands to run if a threads
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37 # library is found, and ACTION-IF-NOT-FOUND is a list of commands to
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38 # run it if it is not found. If ACTION-IF-FOUND is not specified, the
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39 # default action will define HAVE_PTHREAD.
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40 #
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41 # Please let the authors know if this macro fails on any platform, or
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42 # if you have any other suggestions or comments. This macro was based
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43 # on work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/)
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44 # (with help from M. Frigo), as well as ac_pthread and hb_pthread
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45 # macros posted by Alejandro Forero Cuervo to the autoconf macro
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46 # repository. We are also grateful for the helpful feedback of
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47 # numerous users.
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48 #
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49 # LAST MODIFICATION
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50 #
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51 # 2006-05-29
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52 #
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53 # COPYLEFT
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54 #
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55 # Copyright (c) 2006 Steven G. Johnson <stevenj@alum.mit.edu>
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56 #
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57 # This program is free software; you can redistribute it and/or
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58 # modify it under the terms of the GNU General Public License as
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59 # published by the Free Software Foundation; either version 2 of the
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60 # License, or (at your option) any later version.
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61 #
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62 # This program is distributed in the hope that it will be useful, but
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63 # WITHOUT ANY WARRANTY; without even the implied warranty of
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64 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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65 # General Public License for more details.
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66 #
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67 # You should have received a copy of the GNU General Public License
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68 # along with this program; if not, write to the Free Software
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69 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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70 # 02111-1307, USA.
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71 #
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72 # As a special exception, the respective Autoconf Macro's copyright
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73 # owner gives unlimited permission to copy, distribute and modify the
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74 # configure scripts that are the output of Autoconf when processing
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75 # the Macro. You need not follow the terms of the GNU General Public
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76 # License when using or distributing such scripts, even though
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77 # portions of the text of the Macro appear in them. The GNU General
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78 # Public License (GPL) does govern all other use of the material that
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79 # constitutes the Autoconf Macro.
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80 #
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81 # This special exception to the GPL applies to versions of the
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82 # Autoconf Macro released by the Autoconf Macro Archive. When you
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83 # make and distribute a modified version of the Autoconf Macro, you
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84 # may extend this special exception to the GPL to apply to your
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85 # modified version as well.
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86
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87 AC_DEFUN([ACX_PTHREAD], [
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88 AC_REQUIRE([AC_CANONICAL_HOST])
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89 AC_LANG_SAVE
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90 AC_LANG_C
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91 acx_pthread_ok=no
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92
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93 # We used to check for pthread.h first, but this fails if pthread.h
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94 # requires special compiler flags (e.g. on True64 or Sequent).
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95 # It gets checked for in the link test anyway.
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96
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97 # First of all, check if the user has set any of the PTHREAD_LIBS,
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98 # etcetera environment variables, and if threads linking works using
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99 # them:
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100 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
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101 save_CFLAGS="$CFLAGS"
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102 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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103 save_LIBS="$LIBS"
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104 LIBS="$PTHREAD_LIBS $LIBS"
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105 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
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106 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
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107 AC_MSG_RESULT($acx_pthread_ok)
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108 if test x"$acx_pthread_ok" = xno; then
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109 PTHREAD_LIBS=""
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110 PTHREAD_CFLAGS=""
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111 fi
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112 LIBS="$save_LIBS"
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113 CFLAGS="$save_CFLAGS"
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114 fi
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115
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116 # We must check for the threads library under a number of different
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117 # names; the ordering is very important because some systems
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118 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
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119 # libraries is broken (non-POSIX).
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120
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121 # Create a list of thread flags to try. Items starting with a "-" are
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122 # C compiler flags, and other items are library names, except for "none"
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123 # which indicates that we try without any flags at all, and "pthread-config"
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124 # which is a program returning the flags for the Pth emulation library.
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125
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126 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
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127
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128 # The ordering *is* (sometimes) important. Some notes on the
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129 # individual items follow:
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130
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131 # pthreads: AIX (must check this before -lpthread)
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132 # none: in case threads are in libc; should be tried before -Kthread and
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133 # other compiler flags to prevent continual compiler warnings
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134 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
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diff changeset
135 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
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parents:
diff changeset
136 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
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parents:
diff changeset
137 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
138 # -pthreads: Solaris/gcc
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
139 # -mthreads: Mingw32/gcc, Lynx/gcc
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
140 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
141 # doesn't hurt to check since this sometimes defines pthreads too;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
142 # also defines -D_REENTRANT)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
143 # ... -mt is also the pthreads flag for HP/aCC
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
144 # pthread: Linux, etcetera
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
145 # --thread-safe: KAI C++
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
146 # pthread-config: use pthread-config program (for GNU Pth library)
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parents:
diff changeset
147
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
148 case "${host_cpu}-${host_os}" in
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
149 *solaris*)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
150
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151 # On Solaris (at least, for some versions), libc contains stubbed
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parents:
diff changeset
152 # (non-functional) versions of the pthreads routines, so link-based
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diff changeset
153 # tests will erroneously succeed. (We need to link with -pthreads/-mt/
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parents:
diff changeset
154 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
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parents:
diff changeset
155 # a function called by this macro, so we could check for that, but
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parents:
diff changeset
156 # who knows whether they'll stub that too in a future libc.) So,
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parents:
diff changeset
157 # we'll just look for -pthreads and -lpthread first:
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160 ;;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
161 esac
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162
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parents:
diff changeset
163 if test x"$acx_pthread_ok" = xno; then
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diff changeset
164 for flag in $acx_pthread_flags; do
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166 case $flag in
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 none)
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parents:
diff changeset
168 AC_MSG_CHECKING([whether pthreads work without any flags])
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169 ;;
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parents:
diff changeset
170
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171 -*)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172 AC_MSG_CHECKING([whether pthreads work with $flag])
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Carl Byington <carl@five-ten-sg.com>
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diff changeset
173 PTHREAD_CFLAGS="$flag"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174 ;;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 pthread-config)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
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178 if test x"$acx_pthread_config" = xno; then continue; fi
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179 PTHREAD_CFLAGS="`pthread-config --cflags`"
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180 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
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parents:
diff changeset
181 ;;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183 *)
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parents:
diff changeset
184 AC_MSG_CHECKING([for the pthreads library -l$flag])
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185 PTHREAD_LIBS="-l$flag"
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diff changeset
186 ;;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187 esac
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189 save_LIBS="$LIBS"
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Carl Byington <carl@five-ten-sg.com>
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diff changeset
190 save_CFLAGS="$CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191 LIBS="$PTHREAD_LIBS $LIBS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 # Check for various functions. We must include pthread.h,
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195 # since some functions may be macros. (On the Sequent, we
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Carl Byington <carl@five-ten-sg.com>
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diff changeset
196 # need a special flag -Kthread to make this header compile.)
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diff changeset
197 # We check for pthread_join because it is in -lpthread on IRIX
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parents:
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198 # while pthread_create is in libc. We check for pthread_attr_init
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parents:
diff changeset
199 # due to DEC craziness with -lpthreads. We check for
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parents:
diff changeset
200 # pthread_cleanup_push because it is one of the few pthread
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 # functions on Solaris that doesn't have a non-functional libc stub.
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202 # We try pthread_create on general principles.
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203 AC_TRY_LINK([#include <pthread.h>],
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
204 [pthread_t th; pthread_join(th, 0);
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205 pthread_attr_init(0); pthread_cleanup_push(0, 0);
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207 [acx_pthread_ok=yes])
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209 LIBS="$save_LIBS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210 CFLAGS="$save_CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212 AC_MSG_RESULT($acx_pthread_ok)
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parents:
diff changeset
213 if test "x$acx_pthread_ok" = xyes; then
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214 break;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215 fi
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217 PTHREAD_LIBS=""
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 PTHREAD_CFLAGS=""
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219 done
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220 fi
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 # Various other checks:
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223 if test "x$acx_pthread_ok" = xyes; then
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 save_LIBS="$LIBS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225 LIBS="$PTHREAD_LIBS $LIBS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 save_CFLAGS="$CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 AC_MSG_CHECKING([for joinable pthread attribute])
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231 attr_name=unknown
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
234 [attr_name=$attr; break])
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
235 done
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
236 AC_MSG_RESULT($attr_name)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
237 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
239 [Define to necessary symbol if this constant
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
240 uses a non-standard name on your system.])
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
241 fi
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
242
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
243 AC_MSG_CHECKING([if more special flags are required for pthreads])
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
244 flag=no
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
245 case "${host_cpu}-${host_os}" in
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
246 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
247 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
248 esac
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
249 AC_MSG_RESULT(${flag})
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
250 if test "x$flag" != xno; then
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
251 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
252 fi
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
253
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
254 LIBS="$save_LIBS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
255 CFLAGS="$save_CFLAGS"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
256
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
257 # More AIX lossage: must compile with xlc_r or cc_r
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
258 if test x"$GCC" != xyes; then
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
259 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
260 else
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
261 PTHREAD_CC=$CC
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
262 fi
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
263 else
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
264 PTHREAD_CC="$CC"
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
265 fi
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
266
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
267 AC_SUBST(PTHREAD_LIBS)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
268 AC_SUBST(PTHREAD_CFLAGS)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
269 AC_SUBST(PTHREAD_CC)
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
270
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
271 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
9e9f09cf411c Add fixes for Solaris from sm-archive.
Carl Byington <carl@five-ten-sg.com>
parents:
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272 if test x"$acx_pthread_ok" = xyes; then
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Carl Byington <carl@five-ten-sg.com>
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273 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
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274 :
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Carl Byington <carl@five-ten-sg.com>
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275 else
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Carl Byington <carl@five-ten-sg.com>
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276 acx_pthread_ok=no
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Carl Byington <carl@five-ten-sg.com>
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277 $2
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Carl Byington <carl@five-ten-sg.com>
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278 fi
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Carl Byington <carl@five-ten-sg.com>
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279 AC_LANG_RESTORE
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Carl Byington <carl@five-ten-sg.com>
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280 ])dnl ACX_PTHREAD