/[svn]/linuxsampler/trunk/m4/pthread.m4
ViewVC logotype

Contents of /linuxsampler/trunk/m4/pthread.m4

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1454 - (show annotations) (download)
Fri Oct 19 17:52:15 2007 UTC (11 years, 10 months ago) by schoenebeck
File size: 11106 byte(s)
* added autoconf checks for pthread library
* added autoconf check for pthread bug found on certain NPTL-enabled
  glibc versions (see Gentoo bug report #194076)

1 dnl Copyright 2007 Steven G. Johnson <stevenj@alum.mit.edu>
2 dnl
3 dnl This program is free software: you can redistribute it and/or modify it
4 dnl under the terms of the GNU General Public License as published by the
5 dnl Free Software Foundation, either version 3 of the License, or (at your
6 dnl option) any later version.
7 dnl
8 dnl This program is distributed in the hope that it will be useful, but
9 dnl WITHOUT ANY WARRANTY; without even the implied warranty of
10 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 dnl General Public License for more details.
12 dnl
13 dnl You should have received a copy of the GNU General Public License along
14 dnl with this program. If not, see <http://www.gnu.org/licenses/>.
15 dnl
16 dnl As a special exception, the respective Autoconf Macro's copyright owner
17 dnl gives unlimited permission to copy, distribute and modify the configure
18 dnl scripts that are the output of Autoconf when processing the Macro. You
19 dnl need not follow the terms of the GNU General Public License when using
20 dnl or distributing such scripts, even though portions of the text of the
21 dnl Macro appear in them. The GNU General Public License (GPL) does govern
22 dnl all other use of the material that constitutes the Autoconf Macro.
23 dnl
24 dnl This special exception to the GPL applies to versions of the Autoconf
25 dnl Macro released by the Autoconf Macro Archive. When you make and
26 dnl distribute a modified version of the Autoconf Macro, you may extend
27 dnl this special exception to the GPL to apply to your modified version as
28 dnl well.
29 dnl
30 dnl -----------------------------------------------------------------------
31 dnl
32 dnl Synopsis: ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
33 dnl
34 dnl
35 dnl This macro figures out how to build C programs using POSIX threads. It
36 dnl sets the PTHREAD_LIBS output variable to the threads library and linker
37 dnl flags, and the PTHREAD_CFLAGS output variable to any special C compiler
38 dnl flags that are needed. (The user can also force certain compiler
39 dnl flags/libs to be tested by setting these environment variables.)
40 dnl
41 dnl Also sets PTHREAD_CC to any special C compiler that is needed for
42 dnl multi-threaded programs (defaults to the value of CC otherwise). (This
43 dnl is necessary on AIX to use the special cc_r compiler alias.)
44 dnl
45 dnl NOTE: You are assumed to not only compile your program with these
46 dnl flags, but also link it with them as well. e.g. you should link with
47 dnl $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
48 dnl
49 dnl If you are only building threads programs, you may wish to use these
50 dnl variables in your default LIBS, CFLAGS, and CC:
51 dnl
52 dnl LIBS="$PTHREAD_LIBS $LIBS"
53 dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
54 dnl CC="$PTHREAD_CC"
55 dnl
56 dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
57 dnl has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
58 dnl (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
59 dnl
60 dnl ACTION-IF-FOUND is a list of shell commands to run if a threads library
61 dnl is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
62 dnl is not found. If ACTION-IF-FOUND is not specified, the default action
63 dnl will define HAVE_PTHREAD.
64 dnl
65 dnl Please let the authors know if this macro fails on any platform, or if
66 dnl you have any other suggestions or comments. This macro was based on
67 dnl work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with
68 dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros posted
69 dnl by Alejandro Forero Cuervo to the autoconf macro repository. We are also
70 dnl grateful for the helpful feedback of numerous users.
71 dnl
72 dnl -----------------------------------------------------------------------
73 dnl
74 AC_DEFUN([ACX_PTHREAD], [
75 AC_REQUIRE([AC_CANONICAL_HOST])
76 AC_LANG_SAVE
77 AC_LANG_C
78 acx_pthread_ok=no
79
80 # We used to check for pthread.h first, but this fails if pthread.h
81 # requires special compiler flags (e.g. on True64 or Sequent).
82 # It gets checked for in the link test anyway.
83
84 # First of all, check if the user has set any of the PTHREAD_LIBS,
85 # etcetera environment variables, and if threads linking works using
86 # them:
87 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
88 save_CFLAGS="$CFLAGS"
89 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
90 save_LIBS="$LIBS"
91 LIBS="$PTHREAD_LIBS $LIBS"
92 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
93 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
94 AC_MSG_RESULT($acx_pthread_ok)
95 if test x"$acx_pthread_ok" = xno; then
96 PTHREAD_LIBS=""
97 PTHREAD_CFLAGS=""
98 fi
99 LIBS="$save_LIBS"
100 CFLAGS="$save_CFLAGS"
101 fi
102
103 # We must check for the threads library under a number of different
104 # names; the ordering is very important because some systems
105 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
106 # libraries is broken (non-POSIX).
107
108 # Create a list of thread flags to try. Items starting with a "-" are
109 # C compiler flags, and other items are library names, except for "none"
110 # which indicates that we try without any flags at all, and "pthread-config"
111 # which is a program returning the flags for the Pth emulation library.
112
113 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
114
115 # The ordering *is* (sometimes) important. Some notes on the
116 # individual items follow:
117
118 # pthreads: AIX (must check this before -lpthread)
119 # none: in case threads are in libc; should be tried before -Kthread and
120 # other compiler flags to prevent continual compiler warnings
121 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
122 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
123 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
124 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
125 # -pthreads: Solaris/gcc
126 # -mthreads: Mingw32/gcc, Lynx/gcc
127 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
128 # doesn't hurt to check since this sometimes defines pthreads too;
129 # also defines -D_REENTRANT)
130 # ... -mt is also the pthreads flag for HP/aCC
131 # pthread: Linux, etcetera
132 # --thread-safe: KAI C++
133 # pthread-config: use pthread-config program (for GNU Pth library)
134
135 case "${host_cpu}-${host_os}" in
136 *solaris*)
137
138 # On Solaris (at least, for some versions), libc contains stubbed
139 # (non-functional) versions of the pthreads routines, so link-based
140 # tests will erroneously succeed. (We need to link with -pthreads/-mt/
141 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
142 # a function called by this macro, so we could check for that, but
143 # who knows whether they'll stub that too in a future libc.) So,
144 # we'll just look for -pthreads and -lpthread first:
145
146 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
147 ;;
148 esac
149
150 if test x"$acx_pthread_ok" = xno; then
151 for flag in $acx_pthread_flags; do
152
153 case $flag in
154 none)
155 AC_MSG_CHECKING([whether pthreads work without any flags])
156 ;;
157
158 -*)
159 AC_MSG_CHECKING([whether pthreads work with $flag])
160 PTHREAD_CFLAGS="$flag"
161 ;;
162
163 pthread-config)
164 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
165 if test x"$acx_pthread_config" = xno; then continue; fi
166 PTHREAD_CFLAGS="`pthread-config --cflags`"
167 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
168 ;;
169
170 *)
171 AC_MSG_CHECKING([for the pthreads library -l$flag])
172 PTHREAD_LIBS="-l$flag"
173 ;;
174 esac
175
176 save_LIBS="$LIBS"
177 save_CFLAGS="$CFLAGS"
178 LIBS="$PTHREAD_LIBS $LIBS"
179 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
180
181 # Check for various functions. We must include pthread.h,
182 # since some functions may be macros. (On the Sequent, we
183 # need a special flag -Kthread to make this header compile.)
184 # We check for pthread_join because it is in -lpthread on IRIX
185 # while pthread_create is in libc. We check for pthread_attr_init
186 # due to DEC craziness with -lpthreads. We check for
187 # pthread_cleanup_push because it is one of the few pthread
188 # functions on Solaris that doesn't have a non-functional libc stub.
189 # We try pthread_create on general principles.
190 AC_TRY_LINK([#include <pthread.h>],
191 [pthread_t th; pthread_join(th, 0);
192 pthread_attr_init(0); pthread_cleanup_push(0, 0);
193 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
194 [acx_pthread_ok=yes])
195
196 LIBS="$save_LIBS"
197 CFLAGS="$save_CFLAGS"
198
199 AC_MSG_RESULT($acx_pthread_ok)
200 if test "x$acx_pthread_ok" = xyes; then
201 break;
202 fi
203
204 PTHREAD_LIBS=""
205 PTHREAD_CFLAGS=""
206 done
207 fi
208
209 # Various other checks:
210 if test "x$acx_pthread_ok" = xyes; then
211 save_LIBS="$LIBS"
212 LIBS="$PTHREAD_LIBS $LIBS"
213 save_CFLAGS="$CFLAGS"
214 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
215
216 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
217 AC_MSG_CHECKING([for joinable pthread attribute])
218 attr_name=unknown
219 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
220 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
221 [attr_name=$attr; break])
222 done
223 AC_MSG_RESULT($attr_name)
224 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
225 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
226 [Define to necessary symbol if this constant
227 uses a non-standard name on your system.])
228 fi
229
230 AC_MSG_CHECKING([if more special flags are required for pthreads])
231 flag=no
232 case "${host_cpu}-${host_os}" in
233 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
234 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
235 esac
236 AC_MSG_RESULT(${flag})
237 if test "x$flag" != xno; then
238 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
239 fi
240
241 LIBS="$save_LIBS"
242 CFLAGS="$save_CFLAGS"
243
244 # More AIX lossage: must compile with xlc_r or cc_r
245 if test x"$GCC" != xyes; then
246 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
247 else
248 PTHREAD_CC=$CC
249 fi
250 else
251 PTHREAD_CC="$CC"
252 fi
253
254 AC_SUBST(PTHREAD_LIBS)
255 AC_SUBST(PTHREAD_CFLAGS)
256 AC_SUBST(PTHREAD_CC)
257
258 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
259 if test x"$acx_pthread_ok" = xyes; then
260 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
261 :
262 else
263 acx_pthread_ok=no
264 $2
265 fi
266 AC_LANG_RESTORE
267 ])dnl ACX_PTHREAD

  ViewVC Help
Powered by ViewVC