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| 1 # This was retrieved from | |
| 2 # http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&roo
t=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=$PTH
READ_CFLAGS]) | |
| 82 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) | |
| 83 AC_MSG_RESULT($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="$save_CFLAGS" | |
| 90 fi | |
| 91 | |
| 92 # We must check for the threads library under a number of different | |
| 93 # names; the ordering is very important because some systems | |
| 94 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the | |
| 95 # libraries is broken (non-POSIX). | |
| 96 | |
| 97 # Create a list of thread flags to try. Items starting with a "-" are | |
| 98 # C compiler flags, and other items are library names, except for "none" | |
| 99 # which indicates that we try without any flags at all, and "pthread-config" | |
| 100 # which is a program returning the flags for the Pth emulation library. | |
| 101 | |
| 102 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -m
threads pthread --thread-safe -mt pthread-config" | |
| 103 | |
| 104 # The ordering *is* (sometimes) important. Some notes on the | |
| 105 # individual items follow: | |
| 106 | |
| 107 # pthreads: AIX (must check this before -lpthread) | |
| 108 # none: in case threads are in libc; should be tried before -Kthread and | |
| 109 # other compiler flags to prevent continual compiler warnings | |
| 110 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) | |
| 111 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) | |
| 112 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) | |
| 113 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) | |
| 114 # -pthreads: Solaris/gcc | |
| 115 # -mthreads: Mingw32/gcc, Lynx/gcc | |
| 116 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it | |
| 117 # doesn't hurt to check since this sometimes defines pthreads too; | |
| 118 # also defines -D_REENTRANT) | |
| 119 # ... -mt is also the pthreads flag for HP/aCC | |
| 120 # pthread: Linux, etcetera | |
| 121 # --thread-safe: KAI C++ | |
| 122 # pthread-config: use pthread-config program (for GNU Pth library) | |
| 123 | |
| 124 case "${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 inconsistenc
ies]) | |
| 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 AC_MSG_CHECKING([whether what we have so far is sufficient with -nostdli
b]) | |
| 344 CFLAGS="-nostdlib $CFLAGS" | |
| 345 # we need c with nostdlib | |
| 346 LIBS="$LIBS -lc" | |
| 347 AC_TRY_LINK([#include <pthread.h>], | |
| 348 [pthread_t th; pthread_join(th, 0); | |
| 349 pthread_attr_init(0); pthread_cleanup_push(0, 0); | |
| 350 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], | |
| 351 [done=yes],[done=no]) | |
| 352 | |
| 353 if test "x$done" = xyes; then | |
| 354 AC_MSG_RESULT([yes]) | |
| 355 else | |
| 356 AC_MSG_RESULT([no]) | |
| 357 fi | |
| 358 | |
| 359 if test x"$done" = xno; then | |
| 360 AC_MSG_CHECKING([whether -lpthread saves the day]) | |
| 361 LIBS="-lpthread $LIBS" | |
| 362 AC_TRY_LINK([#include <pthread.h>], | |
| 363 [pthread_t th; pthread_join(th, 0); | |
| 364 pthread_attr_init(0); pthread_cleanup_push(0, 0); | |
| 365 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], | |
| 366 [done=yes],[done=no]) | |
| 367 | |
| 368 if test "x$done" = xyes; then | |
| 369 AC_MSG_RESULT([yes]) | |
| 370 PTHREAD_LIBS="$PTHREAD_LIBS -lpthread" | |
| 371 else | |
| 372 AC_MSG_RESULT([no]) | |
| 373 AC_MSG_WARN([Impossible to determine how to use pthreads with shar
ed libraries and -nostdlib]) | |
| 374 fi | |
| 375 fi | |
| 376 | |
| 377 CFLAGS="$save_CFLAGS" | |
| 378 LIBS="$save_LIBS" | |
| 379 CC="$save_CC" | |
| 380 else | |
| 381 PTHREAD_CC="$CC" | |
| 382 fi | |
| 383 | |
| 384 AC_SUBST(PTHREAD_LIBS) | |
| 385 AC_SUBST(PTHREAD_CFLAGS) | |
| 386 AC_SUBST(PTHREAD_CC) | |
| 387 | |
| 388 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
| 389 if test x"$acx_pthread_ok" = xyes; then | |
| 390 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads
libraries and header files.]),[$1]) | |
| 391 : | |
| 392 else | |
| 393 acx_pthread_ok=no | |
| 394 $2 | |
| 395 fi | |
| 396 AC_LANG_RESTORE | |
| 397 ])dnl ACX_PTHREAD | |
| OLD | NEW |
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Chromium Code Reviews
Issue 1322483002:
Revert https://codereview.chromium.org/1291903002 (protobuf roll). (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master