1dnl From http://ac-archive.sourceforge.net/ac-archive/acx_pthread.html 2 3AC_DEFUN([ACX_PTHREAD], [ 4AC_REQUIRE([AC_CANONICAL_HOST]) 5AC_LANG_SAVE 6AC_LANG_C 7acx_pthread_ok=no 8 9# We used to check for pthread.h first, but this fails if pthread.h 10# requires special compiler flags (e.g. on True64 or Sequent). 11# It gets checked for in the link test anyway. 12 13# First of all, check if the user has set any of the PTHREAD_LIBS, 14# etcetera environment variables, and if threads linking works using 15# them: 16if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then 17 save_CFLAGS="$CFLAGS" 18 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 19 save_LIBS="$LIBS" 20 LIBS="$PTHREAD_LIBS $LIBS" 21 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) 22 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) 23 AC_MSG_RESULT($acx_pthread_ok) 24 if test x"$acx_pthread_ok" = xno; then 25 PTHREAD_LIBS="" 26 PTHREAD_CFLAGS="" 27 fi 28 LIBS="$save_LIBS" 29 CFLAGS="$save_CFLAGS" 30fi 31 32# We must check for the threads library under a number of different 33# names; the ordering is very important because some systems 34# (e.g. DEC) have both -lpthread and -lpthreads, where one of the 35# libraries is broken (non-POSIX). 36 37# Create a list of thread flags to try. Items starting with a "-" are 38# C compiler flags, and other items are library names, except for "none" 39# which indicates that we try without any flags at all, and "pthread-config" 40# which is a program returning the flags for the Pth emulation library. 41 42acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt -mthreads pthread --thread-safe pthread-config pthreadGC2" 43 44# The ordering *is* (sometimes) important. Some notes on the 45# individual items follow: 46 47# pthreads: AIX (must check this before -lpthread) 48# none: in case threads are in libc; should be tried before -Kthread and 49# other compiler flags to prevent continual compiler warnings 50# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) 51# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) 52# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) 53# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) 54# -pthreads: Solaris/gcc 55# -mthreads: Mingw32/gcc, Lynx/gcc 56# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it 57# doesn't hurt to check since this sometimes defines pthreads too; 58# also defines -D_REENTRANT) 59# ... -mt is also the pthreads flag for HP/aCC 60# pthread: Linux, etcetera 61# --thread-safe: KAI C++ 62# pthread-config: use pthread-config program (for GNU Pth library) 63 64case "${host_cpu}-${host_os}" in 65 *solaris*) 66 67 # On Solaris (at least, for some versions), libc contains stubbed 68 # (non-functional) versions of the pthreads routines, so link-based 69 # tests will erroneously succeed. (We need to link with -pthreads/-mt/ 70 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather 71 # a function called by this macro, so we could check for that, but 72 # who knows whether they'll stub that too in a future libc.) So, 73 # we'll just look for -pthreads and -lpthread first: 74 75 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" 76 ;; 77esac 78 79if test x"$acx_pthread_ok" = xno; then 80for flag in $acx_pthread_flags; do 81 82 case $flag in 83 none) 84 AC_MSG_CHECKING([whether pthreads work without any flags]) 85 ;; 86 87 -*) 88 AC_MSG_CHECKING([whether pthreads work with $flag]) 89 PTHREAD_CFLAGS="$flag" 90 ;; 91 92 pthread-config) 93 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) 94 if test x"$acx_pthread_config" = xno; then continue; fi 95 PTHREAD_CFLAGS="`pthread-config --cflags`" 96 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" 97 ;; 98 99 *) 100 AC_MSG_CHECKING([for the pthreads library -l$flag]) 101 PTHREAD_LIBS="-l$flag" 102 ;; 103 esac 104 105 save_LIBS="$LIBS" 106 save_CFLAGS="$CFLAGS" 107 LIBS="$PTHREAD_LIBS $LIBS" 108 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 109 110 # Check for various functions. We must include pthread.h, 111 # since some functions may be macros. (On the Sequent, we 112 # need a special flag -Kthread to make this header compile.) 113 # We check for pthread_join because it is in -lpthread on IRIX 114 # while pthread_create is in libc. We check for pthread_attr_init 115 # due to DEC craziness with -lpthreads. We check for 116 # pthread_cleanup_push because it is one of the few pthread 117 # functions on Solaris that doesn't have a non-functional libc stub. 118 # We try pthread_create on general principles. 119 AC_TRY_LINK([#include <pthread.h>], 120 [pthread_t th; pthread_join(th, 0); 121 pthread_attr_init(0); pthread_cleanup_push(0, 0); 122 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], 123 [acx_pthread_ok=yes]) 124 125 LIBS="$save_LIBS" 126 CFLAGS="$save_CFLAGS" 127 128 AC_MSG_RESULT($acx_pthread_ok) 129 if test "x$acx_pthread_ok" = xyes; then 130 break; 131 fi 132 133 PTHREAD_LIBS="" 134 PTHREAD_CFLAGS="" 135done 136fi 137 138# Various other checks: 139if test "x$acx_pthread_ok" = xyes; then 140 save_LIBS="$LIBS" 141 LIBS="$PTHREAD_LIBS $LIBS" 142 save_CFLAGS="$CFLAGS" 143 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 144 145 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. 146 AC_MSG_CHECKING([for joinable pthread attribute]) 147 attr_name=unknown 148 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do 149 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], 150 [attr_name=$attr; break]) 151 done 152 AC_MSG_RESULT($attr_name) 153 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then 154 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, 155 [Define to necessary symbol if this constant 156 uses a non-standard name on your system.]) 157 fi 158 159 AC_MSG_CHECKING([if more special flags are required for pthreads]) 160 flag=no 161 case "${host_cpu}-${host_os}" in 162 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; 163 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; 164 esac 165 AC_MSG_RESULT(${flag}) 166 if test "x$flag" != xno; then 167 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" 168 fi 169 170 LIBS="$save_LIBS" 171 CFLAGS="$save_CFLAGS" 172 173 # More AIX lossage: must compile with xlc_r or cc_r 174 if test x"$GCC" != xyes; then 175 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) 176 else 177 PTHREAD_CC=$CC 178 fi 179else 180 PTHREAD_CC="$CC" 181fi 182 183AC_SUBST(PTHREAD_LIBS) 184AC_SUBST(PTHREAD_CFLAGS) 185AC_SUBST(PTHREAD_CC) 186 187# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: 188if test x"$acx_pthread_ok" = xyes; then 189 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) 190 : 191else 192 acx_pthread_ok=no 193 $2 194fi 195AC_LANG_RESTORE 196])dnl ACX_PTHREAD 197 198m4_ifdef([AC_PROG_MKDIR_P], [ 199 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. 200 m4_define([AC_PROG_MKDIR_P], 201 m4_defn([AC_PROG_MKDIR_P])[ 202 AC_SUBST([MKDIR_P])])], [ 203 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. 204 AC_DEFUN([AC_PROG_MKDIR_P], 205 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake 206 MKDIR_P='$(mkdir_p)' 207 AC_SUBST([MKDIR_P])])]) 208