| [12746] | 1 | # This was retrieved from
|
|---|
| 2 | # http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi
|
|---|
| 3 | # See also (perhaps for new versions?)
|
|---|
| 4 | # http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi
|
|---|
| 5 | #
|
|---|
| 6 | # We've rewritten the inconsistency check code (from avahi), to work
|
|---|
| 7 | # more broadly. In particular, it no longer assumes ld accepts -zdefs.
|
|---|
| 8 | # This caused a restructing of the code, but the functionality has only
|
|---|
| 9 | # changed a little.
|
|---|
| 10 |
|
|---|
| 11 | dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
|
|---|
| 12 | dnl
|
|---|
| 13 | dnl @summary figure out how to build C programs using POSIX threads
|
|---|
| 14 | dnl
|
|---|
| 15 | dnl This macro figures out how to build C programs using POSIX threads.
|
|---|
| 16 | dnl It sets the PTHREAD_LIBS output variable to the threads library and
|
|---|
| 17 | dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
|
|---|
| 18 | dnl C compiler flags that are needed. (The user can also force certain
|
|---|
| 19 | dnl compiler flags/libs to be tested by setting these environment
|
|---|
| 20 | dnl variables.)
|
|---|
| 21 | dnl
|
|---|
| 22 | dnl Also sets PTHREAD_CC to any special C compiler that is needed for
|
|---|
| 23 | dnl multi-threaded programs (defaults to the value of CC otherwise).
|
|---|
| 24 | dnl (This is necessary on AIX to use the special cc_r compiler alias.)
|
|---|
| 25 | dnl
|
|---|
| 26 | dnl NOTE: You are assumed to not only compile your program with these
|
|---|
| 27 | dnl flags, but also link it with them as well. e.g. you should link
|
|---|
| 28 | dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
|
|---|
| 29 | dnl $LIBS
|
|---|
| 30 | dnl
|
|---|
| 31 | dnl If you are only building threads programs, you may wish to use
|
|---|
| 32 | dnl these variables in your default LIBS, CFLAGS, and CC:
|
|---|
| 33 | dnl
|
|---|
| 34 | dnl LIBS="$PTHREAD_LIBS $LIBS"
|
|---|
| 35 | dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
|
|---|
| 36 | dnl CC="$PTHREAD_CC"
|
|---|
| 37 | dnl
|
|---|
| 38 | dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
|
|---|
| 39 | dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
|
|---|
| 40 | dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
|
|---|
| 41 | dnl
|
|---|
| 42 | dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
|
|---|
| 43 | dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
|
|---|
| 44 | dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
|
|---|
| 45 | dnl default action will define HAVE_PTHREAD.
|
|---|
| 46 | dnl
|
|---|
| 47 | dnl Please let the authors know if this macro fails on any platform, or
|
|---|
| 48 | dnl if you have any other suggestions or comments. This macro was based
|
|---|
| 49 | dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
|
|---|
| 50 | dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
|
|---|
| 51 | dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
|
|---|
| 52 | dnl We are also grateful for the helpful feedback of numerous users.
|
|---|
| 53 | dnl
|
|---|
| 54 | dnl @category InstalledPackages
|
|---|
| 55 | dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
|
|---|
| 56 | dnl @version 2006-05-29
|
|---|
| 57 | dnl @license GPLWithACException
|
|---|
| 58 | dnl
|
|---|
| 59 | dnl Checks for GCC shared/pthread inconsistency based on work by
|
|---|
| 60 | dnl Marcin Owsiany <marcin@owsiany.pl>
|
|---|
| 61 |
|
|---|
| 62 |
|
|---|
| 63 | AC_DEFUN([ACX_PTHREAD], [
|
|---|
| 64 | AC_REQUIRE([AC_CANONICAL_HOST])
|
|---|
| 65 | AC_LANG_SAVE
|
|---|
| 66 | AC_LANG_C
|
|---|
| 67 | acx_pthread_ok=no
|
|---|
| 68 |
|
|---|
| 69 | # We used to check for pthread.h first, but this fails if pthread.h
|
|---|
| 70 | # requires special compiler flags (e.g. on True64 or Sequent).
|
|---|
| 71 | # It gets checked for in the link test anyway.
|
|---|
| 72 |
|
|---|
| 73 | # First of all, check if the user has set any of the PTHREAD_LIBS,
|
|---|
| 74 | # etcetera environment variables, and if threads linking works using
|
|---|
| 75 | # them:
|
|---|
| 76 | if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
|
|---|
| 77 | save_CFLAGS="$CFLAGS"
|
|---|
| 78 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
|
|---|
| 79 | save_LIBS="$LIBS"
|
|---|
| 80 | LIBS="$PTHREAD_LIBS $LIBS"
|
|---|
| 81 | AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
|
|---|
| 82 | AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
|
|---|
| 83 | AC_MSG_RESULT($acx_pthread_ok)
|
|---|
| 84 | if test x"$acx_pthread_ok" = xno; then
|
|---|
| 85 | PTHREAD_LIBS=""
|
|---|
| 86 | PTHREAD_CFLAGS=""
|
|---|
| 87 | fi
|
|---|
| 88 | LIBS="$save_LIBS"
|
|---|
| 89 | CFLAGS="$save_CFLAGS"
|
|---|
| 90 | fi
|
|---|
| 91 |
|
|---|
| 92 | # We must check for the threads library under a number of different
|
|---|
| 93 | # names; the ordering is very important because some systems
|
|---|
| 94 | # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
|
|---|
| 95 | # libraries is broken (non-POSIX).
|
|---|
| 96 |
|
|---|
| 97 | # Create a list of thread flags to try. Items starting with a "-" are
|
|---|
| 98 | # C compiler flags, and other items are library names, except for "none"
|
|---|
| 99 | # which indicates that we try without any flags at all, and "pthread-config"
|
|---|
| 100 | # which is a program returning the flags for the Pth emulation library.
|
|---|
| 101 |
|
|---|
| 102 | acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
|
|---|
| 103 |
|
|---|
| 104 | # The ordering *is* (sometimes) important. Some notes on the
|
|---|
| 105 | # individual items follow:
|
|---|
| 106 |
|
|---|
| 107 | # pthreads: AIX (must check this before -lpthread)
|
|---|
| 108 | # none: in case threads are in libc; should be tried before -Kthread and
|
|---|
| 109 | # other compiler flags to prevent continual compiler warnings
|
|---|
| 110 | # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
|
|---|
| 111 | # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
|
|---|
| 112 | # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
|
|---|
| 113 | # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
|
|---|
| 114 | # -pthreads: Solaris/gcc
|
|---|
| 115 | # -mthreads: Mingw32/gcc, Lynx/gcc
|
|---|
| 116 | # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
|
|---|
| 117 | # doesn't hurt to check since this sometimes defines pthreads too;
|
|---|
| 118 | # also defines -D_REENTRANT)
|
|---|
| 119 | # ... -mt is also the pthreads flag for HP/aCC
|
|---|
| 120 | # pthread: Linux, etcetera
|
|---|
| 121 | # --thread-safe: KAI C++
|
|---|
| 122 | # pthread-config: use pthread-config program (for GNU Pth library)
|
|---|
| 123 |
|
|---|
| 124 | case "${host_cpu}-${host_os}" in
|
|---|
| 125 | *solaris*)
|
|---|
| 126 |
|
|---|
| 127 | # On Solaris (at least, for some versions), libc contains stubbed
|
|---|
| 128 | # (non-functional) versions of the pthreads routines, so link-based
|
|---|
| 129 | # tests will erroneously succeed. (We need to link with -pthreads/-mt/
|
|---|
| 130 | # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
|
|---|
| 131 | # a function called by this macro, so we could check for that, but
|
|---|
| 132 | # who knows whether they'll stub that too in a future libc.) So,
|
|---|
| 133 | # we'll just look for -pthreads and -lpthread first:
|
|---|
| 134 |
|
|---|
| 135 | acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
|
|---|
| 136 | ;;
|
|---|
| 137 | esac
|
|---|
| 138 |
|
|---|
| 139 | if test x"$acx_pthread_ok" = xno; then
|
|---|
| 140 | for flag in $acx_pthread_flags; do
|
|---|
| 141 |
|
|---|
| 142 | case $flag in
|
|---|
| 143 | none)
|
|---|
| 144 | AC_MSG_CHECKING([whether pthreads work without any flags])
|
|---|
| 145 | ;;
|
|---|
| 146 |
|
|---|
| 147 | -*)
|
|---|
| 148 | AC_MSG_CHECKING([whether pthreads work with $flag])
|
|---|
| 149 | PTHREAD_CFLAGS="$flag"
|
|---|
| 150 | ;;
|
|---|
| 151 |
|
|---|
| 152 | pthread-config)
|
|---|
| 153 | AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
|
|---|
| 154 | if test x"$acx_pthread_config" = xno; then continue; fi
|
|---|
| 155 | PTHREAD_CFLAGS="`pthread-config --cflags`"
|
|---|
| 156 | PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
|
|---|
| 157 | ;;
|
|---|
| 158 |
|
|---|
| 159 | *)
|
|---|
| 160 | AC_MSG_CHECKING([for the pthreads library -l$flag])
|
|---|
| 161 | PTHREAD_LIBS="-l$flag"
|
|---|
| 162 | ;;
|
|---|
| 163 | esac
|
|---|
| 164 |
|
|---|
| 165 | save_LIBS="$LIBS"
|
|---|
| 166 | save_CFLAGS="$CFLAGS"
|
|---|
| 167 | LIBS="$PTHREAD_LIBS $LIBS"
|
|---|
| 168 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
|
|---|
| 169 |
|
|---|
| 170 | # Check for various functions. We must include pthread.h,
|
|---|
| 171 | # since some functions may be macros. (On the Sequent, we
|
|---|
| 172 | # need a special flag -Kthread to make this header compile.)
|
|---|
| 173 | # We check for pthread_join because it is in -lpthread on IRIX
|
|---|
| 174 | # while pthread_create is in libc. We check for pthread_attr_init
|
|---|
| 175 | # due to DEC craziness with -lpthreads. We check for
|
|---|
| 176 | # pthread_cleanup_push because it is one of the few pthread
|
|---|
| 177 | # functions on Solaris that doesn't have a non-functional libc stub.
|
|---|
| 178 | # We try pthread_create on general principles.
|
|---|
| 179 | AC_TRY_LINK([#include <pthread.h>],
|
|---|
| 180 | [pthread_t th; pthread_join(th, 0);
|
|---|
| 181 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|---|
| 182 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|---|
| 183 | [acx_pthread_ok=yes])
|
|---|
| 184 |
|
|---|
| 185 | LIBS="$save_LIBS"
|
|---|
| 186 | CFLAGS="$save_CFLAGS"
|
|---|
| 187 |
|
|---|
| 188 | AC_MSG_RESULT($acx_pthread_ok)
|
|---|
| 189 | if test "x$acx_pthread_ok" = xyes; then
|
|---|
| 190 | break;
|
|---|
| 191 | fi
|
|---|
| 192 |
|
|---|
| 193 | PTHREAD_LIBS=""
|
|---|
| 194 | PTHREAD_CFLAGS=""
|
|---|
| 195 | done
|
|---|
| 196 | fi
|
|---|
| 197 |
|
|---|
| 198 | # Various other checks:
|
|---|
| 199 | if test "x$acx_pthread_ok" = xyes; then
|
|---|
| 200 | save_LIBS="$LIBS"
|
|---|
| 201 | LIBS="$PTHREAD_LIBS $LIBS"
|
|---|
| 202 | save_CFLAGS="$CFLAGS"
|
|---|
| 203 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
|
|---|
| 204 |
|
|---|
| 205 | # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
|
|---|
| 206 | AC_MSG_CHECKING([for joinable pthread attribute])
|
|---|
| 207 | attr_name=unknown
|
|---|
| 208 | for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
|
|---|
| 209 | AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
|
|---|
| 210 | [attr_name=$attr; break])
|
|---|
| 211 | done
|
|---|
| 212 | AC_MSG_RESULT($attr_name)
|
|---|
| 213 | if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
|
|---|
| 214 | AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
|
|---|
| 215 | [Define to necessary symbol if this constant
|
|---|
| 216 | uses a non-standard name on your system.])
|
|---|
| 217 | fi
|
|---|
| 218 |
|
|---|
| 219 | AC_MSG_CHECKING([if more special flags are required for pthreads])
|
|---|
| 220 | flag=no
|
|---|
| 221 | case "${host_cpu}-${host_os}" in
|
|---|
| 222 | *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
|
|---|
| 223 | *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
|
|---|
| 224 | esac
|
|---|
| 225 | AC_MSG_RESULT(${flag})
|
|---|
| 226 | if test "x$flag" != xno; then
|
|---|
| 227 | PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
|
|---|
| 228 | fi
|
|---|
| 229 |
|
|---|
| 230 | LIBS="$save_LIBS"
|
|---|
| 231 | CFLAGS="$save_CFLAGS"
|
|---|
| 232 | # More AIX lossage: must compile with xlc_r or cc_r
|
|---|
| 233 | if test x"$GCC" != xyes; then
|
|---|
| 234 | AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
|
|---|
| 235 | else
|
|---|
| 236 | PTHREAD_CC=$CC
|
|---|
| 237 | fi
|
|---|
| 238 |
|
|---|
| 239 | # The next part tries to detect GCC inconsistency with -shared on some
|
|---|
| 240 | # architectures and systems. The problem is that in certain
|
|---|
| 241 | # configurations, when -shared is specified, GCC "forgets" to
|
|---|
| 242 | # internally use various flags which are still necessary.
|
|---|
| 243 |
|
|---|
| 244 | #
|
|---|
| 245 | # Prepare the flags
|
|---|
| 246 | #
|
|---|
| 247 | save_CFLAGS="$CFLAGS"
|
|---|
| 248 | save_LIBS="$LIBS"
|
|---|
| 249 | save_CC="$CC"
|
|---|
| 250 |
|
|---|
| 251 | # Try with the flags determined by the earlier checks.
|
|---|
| 252 | #
|
|---|
| 253 | # -Wl,-z,defs forces link-time symbol resolution, so that the
|
|---|
| 254 | # linking checks with -shared actually have any value
|
|---|
| 255 | #
|
|---|
| 256 | # FIXME: -fPIC is required for -shared on many architectures,
|
|---|
| 257 | # so we specify it here, but the right way would probably be to
|
|---|
| 258 | # properly detect whether it is actually required.
|
|---|
| 259 | CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
|
|---|
| 260 | LIBS="$PTHREAD_LIBS $LIBS"
|
|---|
| 261 | CC="$PTHREAD_CC"
|
|---|
| 262 |
|
|---|
| 263 | # In order not to create several levels of indentation, we test
|
|---|
| 264 | # the value of "$done" until we find the cure or run out of ideas.
|
|---|
| 265 | done="no"
|
|---|
| 266 |
|
|---|
| 267 | # First, make sure the CFLAGS we added are actually accepted by our
|
|---|
| 268 | # compiler. If not (and OS X's ld, for instance, does not accept -z),
|
|---|
| 269 | # then we can't do this test.
|
|---|
| 270 | if test x"$done" = xno; then
|
|---|
| 271 | AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
|
|---|
| 272 | AC_TRY_LINK(,, , [done=yes])
|
|---|
| 273 |
|
|---|
| 274 | if test "x$done" = xyes ; then
|
|---|
| 275 | AC_MSG_RESULT([no])
|
|---|
| 276 | else
|
|---|
| 277 | AC_MSG_RESULT([yes])
|
|---|
| 278 | fi
|
|---|
| 279 | fi
|
|---|
| 280 |
|
|---|
| 281 | if test x"$done" = xno; then
|
|---|
| 282 | AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
|
|---|
| 283 | AC_TRY_LINK([#include <pthread.h>],
|
|---|
| 284 | [pthread_t th; pthread_join(th, 0);
|
|---|
| 285 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|---|
| 286 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|---|
| 287 | [done=yes])
|
|---|
| 288 |
|
|---|
| 289 | if test "x$done" = xyes; then
|
|---|
| 290 | AC_MSG_RESULT([yes])
|
|---|
| 291 | else
|
|---|
| 292 | AC_MSG_RESULT([no])
|
|---|
| 293 | fi
|
|---|
| 294 | fi
|
|---|
| 295 |
|
|---|
| 296 | #
|
|---|
| 297 | # Linux gcc on some architectures such as mips/mipsel forgets
|
|---|
| 298 | # about -lpthread
|
|---|
| 299 | #
|
|---|
| 300 | if test x"$done" = xno; then
|
|---|
| 301 | AC_MSG_CHECKING([whether -lpthread fixes that])
|
|---|
| 302 | LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
|
|---|
| 303 | AC_TRY_LINK([#include <pthread.h>],
|
|---|
| 304 | [pthread_t th; pthread_join(th, 0);
|
|---|
| 305 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|---|
| 306 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|---|
| 307 | [done=yes])
|
|---|
| 308 |
|
|---|
| 309 | if test "x$done" = xyes; then
|
|---|
| 310 | AC_MSG_RESULT([yes])
|
|---|
| 311 | PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
|
|---|
| 312 | else
|
|---|
| 313 | AC_MSG_RESULT([no])
|
|---|
| 314 | fi
|
|---|
| 315 | fi
|
|---|
| 316 | #
|
|---|
| 317 | # FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
|
|---|
| 318 | #
|
|---|
| 319 | if test x"$done" = xno; then
|
|---|
| 320 | AC_MSG_CHECKING([whether -lc_r fixes that])
|
|---|
| 321 | LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
|
|---|
| 322 | AC_TRY_LINK([#include <pthread.h>],
|
|---|
| 323 | [pthread_t th; pthread_join(th, 0);
|
|---|
| 324 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|---|
| 325 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|---|
| 326 | [done=yes])
|
|---|
| 327 |
|
|---|
| 328 | if test "x$done" = xyes; then
|
|---|
| 329 | AC_MSG_RESULT([yes])
|
|---|
| 330 | PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
|
|---|
| 331 | else
|
|---|
| 332 | AC_MSG_RESULT([no])
|
|---|
| 333 | fi
|
|---|
| 334 | fi
|
|---|
| 335 | if test x"$done" = xno; then
|
|---|
| 336 | # OK, we have run out of ideas
|
|---|
| 337 | AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
|
|---|
| 338 |
|
|---|
| 339 | # so it's not safe to assume that we may use pthreads
|
|---|
| 340 | acx_pthread_ok=no
|
|---|
| 341 | fi
|
|---|
| 342 |
|
|---|
| 343 | CFLAGS="$save_CFLAGS"
|
|---|
| 344 | LIBS="$save_LIBS"
|
|---|
| 345 | CC="$save_CC"
|
|---|
| 346 | else
|
|---|
| 347 | PTHREAD_CC="$CC"
|
|---|
| 348 | fi
|
|---|
| 349 |
|
|---|
| 350 | AC_SUBST(PTHREAD_LIBS)
|
|---|
| 351 | AC_SUBST(PTHREAD_CFLAGS)
|
|---|
| 352 | AC_SUBST(PTHREAD_CC)
|
|---|
| 353 |
|
|---|
| 354 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
|
|---|
| 355 | if test x"$acx_pthread_ok" = xyes; then
|
|---|
| 356 | ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
|
|---|
| 357 | :
|
|---|
| 358 | else
|
|---|
| 359 | acx_pthread_ok=no
|
|---|
| 360 | $2
|
|---|
| 361 | fi
|
|---|
| 362 | AC_LANG_RESTORE
|
|---|
| 363 | ])dnl ACX_PTHREAD
|
|---|
