config-scripts/cups-threads.m4

   1 dnl
   2 dnl Threading stuff for CUPS.
   3 dnl
   4 dnl Copyright 2007-2017 by Apple Inc.
   5 dnl Copyright 1997-2005 by Easy Software Products, all rights reserved.
   6 dnl
   7 dnl Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
   8 dnl
   9
  10 AC_ARG_ENABLE(threads, [  --disable-threads       disable multi-threading support])
  11
  12 have_pthread=no
  13 PTHREAD_FLAGS=""
  14
  15 if test "x$enable_threads" != xno; then
  16         AC_CHECK_HEADER(pthread.h, AC_DEFINE(HAVE_PTHREAD_H))
  17
  18         if test x$ac_cv_header_pthread_h = xyes; then
  19                 dnl Check various threading options for the platforms we support
  20                 for flag in -lpthreads -lpthread -pthread; do
  21                         AC_MSG_CHECKING([for pthread_create using $flag])
  22                         SAVELIBS="$LIBS"
  23                         LIBS="$flag $LIBS"
  24                         AC_TRY_LINK([#include <pthread.h>],
  25                                 [pthread_create(0, 0, 0, 0);],
  26                                 have_pthread=yes,
  27                                 LIBS="$SAVELIBS")
  28                         AC_MSG_RESULT([$have_pthread])
  29
  30                         if test $have_pthread = yes; then
  31                                 PTHREAD_FLAGS="-D_THREAD_SAFE -D_REENTRANT"
  32
  33                                 # Solaris requires -D_POSIX_PTHREAD_SEMANTICS to
  34                                 # be POSIX-compliant... :(
  35                                 if test $host_os_name = sunos; then
  36                                         PTHREAD_FLAGS="$PTHREAD_FLAGS -D_POSIX_PTHREAD_SEMANTICS"
  37                                 fi
  38                                 break
  39                         fi
  40                 done
  41         fi
  42 fi
  43
  44 AC_SUBST(PTHREAD_FLAGS)