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| 1 ##### http://autoconf-archive.cryp.to/acx_pthread.html | |
| 2 # | |
| 3 # SYNOPSIS | |
| 4 # | |
| 5 # ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) | |
| 6 # | |
| 7 # DESCRIPTION | |
| 8 # | |
| 9 # This macro figures out how to build C programs using POSIX threads. | |
| 10 # It sets the PTHREAD_LIBS output variable to the threads library and | |
| 11 # linker flags, and the PTHREAD_CFLAGS output variable to any special | |
| 12 # C compiler flags that are needed. (The user can also force certain | |
| 13 # compiler flags/libs to be tested by setting these environment | |
| 14 # variables.) | |
| 15 # | |
| 16 # Also sets PTHREAD_CC to any special C compiler that is needed for | |
| 17 # multi-threaded programs (defaults to the value of CC otherwise). | |
| 18 # (This is necessary on AIX to use the special cc_r compiler alias.) | |
| 19 # | |
| 20 # NOTE: You are assumed to not only compile your program with these | |
| 21 # flags, but also link it with them as well. e.g. you should link | |
| 22 # with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS | |
| 23 # $LIBS | |
| 24 # | |
| 25 # If you are only building threads programs, you may wish to use | |
| 26 # these variables in your default LIBS, CFLAGS, and CC: | |
| 27 # | |
| 28 # LIBS="$PTHREAD_LIBS $LIBS" | |
| 29 # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
| 30 # CC="$PTHREAD_CC" | |
| 31 # | |
| 32 # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute | |
| 33 # constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to | |
| 34 # that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX). | |
| 35 # | |
| 36 # ACTION-IF-FOUND is a list of shell commands to run if a threads | |
| 37 # library is found, and ACTION-IF-NOT-FOUND is a list of commands to | |
| 38 # run it if it is not found. If ACTION-IF-FOUND is not specified, the | |
| 39 # default action will define HAVE_PTHREAD. | |
| 40 # | |
| 41 # Please let the authors know if this macro fails on any platform, or | |
| 42 # if you have any other suggestions or comments. This macro was based | |
| 43 # on work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) | |
| 44 # (with help from M. Frigo), as well as ac_pthread and hb_pthread | |
| 45 # macros posted by Alejandro Forero Cuervo to the autoconf macro | |
| 46 # repository. We are also grateful for the helpful feedback of | |
| 47 # numerous users. | |
| 48 # | |
| 49 # LAST MODIFICATION | |
| 50 # | |
| 51 # 2007-07-29 | |
| 52 # | |
| 53 # COPYLEFT | |
| 54 # | |
| 55 # Copyright (c) 2007 Steven G. Johnson <stevenj@alum.mit.edu> | |
| 56 # | |
| 57 # This program is free software: you can redistribute it and/or | |
| 58 # modify it under the terms of the GNU General Public License as | |
| 59 # published by the Free Software Foundation, either version 3 of the | |
| 60 # License, or (at your option) any later version. | |
| 61 # | |
| 62 # This program is distributed in the hope that it will be useful, but | |
| 63 # WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 64 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 65 # General Public License for more details. | |
| 66 # | |
| 67 # You should have received a copy of the GNU General Public License | |
| 68 # along with this program. If not, see | |
| 69 # <http://www.gnu.org/licenses/>. | |
| 70 # | |
| 71 # As a special exception, the respective Autoconf Macro's copyright | |
| 72 # owner gives unlimited permission to copy, distribute and modify the | |
| 73 # configure scripts that are the output of Autoconf when processing | |
| 74 # the Macro. You need not follow the terms of the GNU General Public | |
| 75 # License when using or distributing such scripts, even though | |
| 76 # portions of the text of the Macro appear in them. The GNU General | |
| 77 # Public License (GPL) does govern all other use of the material that | |
| 78 # constitutes the Autoconf Macro. | |
| 79 # | |
| 80 # This special exception to the GPL applies to versions of the | |
| 81 # Autoconf Macro released by the Autoconf Macro Archive. When you | |
| 82 # make and distribute a modified version of the Autoconf Macro, you | |
| 83 # may extend this special exception to the GPL to apply to your | |
| 84 # modified version as well. | |
| 85 | |
| 86 AC_DEFUN([ACX_PTHREAD], [ | |
| 87 AC_REQUIRE([AC_CANONICAL_HOST]) | |
| 88 AC_LANG_SAVE | |
| 89 AC_LANG_C | |
| 90 acx_pthread_ok=no | |
| 91 | |
| 92 # We used to check for pthread.h first, but this fails if pthread.h | |
| 93 # requires special compiler flags (e.g. on True64 or Sequent). | |
| 94 # It gets checked for in the link test anyway. | |
| 95 | |
| 96 # First of all, check if the user has set any of the PTHREAD_LIBS, | |
| 97 # etcetera environment variables, and if threads linking works using | |
| 98 # them: | |
| 99 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then | |
| 100 save_CFLAGS="$CFLAGS" | |
| 101 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
| 102 save_LIBS="$LIBS" | |
| 103 LIBS="$PTHREAD_LIBS $LIBS" | |
| 104 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTH
READ_CFLAGS]) | |
| 105 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) | |
| 106 AC_MSG_RESULT($acx_pthread_ok) | |
| 107 if test x"$acx_pthread_ok" = xno; then | |
| 108 PTHREAD_LIBS="" | |
| 109 PTHREAD_CFLAGS="" | |
| 110 fi | |
| 111 LIBS="$save_LIBS" | |
| 112 CFLAGS="$save_CFLAGS" | |
| 113 fi | |
| 114 | |
| 115 # We must check for the threads library under a number of different | |
| 116 # names; the ordering is very important because some systems | |
| 117 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the | |
| 118 # libraries is broken (non-POSIX). | |
| 119 | |
| 120 # Create a list of thread flags to try. Items starting with a "-" are | |
| 121 # C compiler flags, and other items are library names, except for "none" | |
| 122 # which indicates that we try without any flags at all, and "pthread-config" | |
| 123 # which is a program returning the flags for the Pth emulation library. | |
| 124 | |
| 125 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -m
threads pthread --thread-safe -mt pthread-config" | |
| 126 | |
| 127 # The ordering *is* (sometimes) important. Some notes on the | |
| 128 # individual items follow: | |
| 129 | |
| 130 # pthreads: AIX (must check this before -lpthread) | |
| 131 # none: in case threads are in libc; should be tried before -Kthread and | |
| 132 # other compiler flags to prevent continual compiler warnings | |
| 133 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) | |
| 134 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) | |
| 135 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) | |
| 136 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) | |
| 137 # -pthreads: Solaris/gcc | |
| 138 # -mthreads: Mingw32/gcc, Lynx/gcc | |
| 139 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it | |
| 140 # doesn't hurt to check since this sometimes defines pthreads too; | |
| 141 # also defines -D_REENTRANT) | |
| 142 # ... -mt is also the pthreads flag for HP/aCC | |
| 143 # pthread: Linux, etcetera | |
| 144 # --thread-safe: KAI C++ | |
| 145 # pthread-config: use pthread-config program (for GNU Pth library) | |
| 146 | |
| 147 case "${host_cpu}-${host_os}" in | |
| 148 *solaris*) | |
| 149 | |
| 150 # On Solaris (at least, for some versions), libc contains stubbed | |
| 151 # (non-functional) versions of the pthreads routines, so link-based | |
| 152 # tests will erroneously succeed. (We need to link with -pthreads/-mt/ | |
| 153 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather | |
| 154 # a function called by this macro, so we could check for that, but | |
| 155 # who knows whether they'll stub that too in a future libc.) So, | |
| 156 # we'll just look for -pthreads and -lpthread first: | |
| 157 | |
| 158 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" | |
| 159 ;; | |
| 160 esac | |
| 161 | |
| 162 if test x"$acx_pthread_ok" = xno; then | |
| 163 for flag in $acx_pthread_flags; do | |
| 164 | |
| 165 case $flag in | |
| 166 none) | |
| 167 AC_MSG_CHECKING([whether pthreads work without any flags]) | |
| 168 ;; | |
| 169 | |
| 170 -*) | |
| 171 AC_MSG_CHECKING([whether pthreads work with $flag]) | |
| 172 PTHREAD_CFLAGS="$flag" | |
| 173 ;; | |
| 174 | |
| 175 pthread-config) | |
| 176 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) | |
| 177 if test x"$acx_pthread_config" = xno; then continue; fi | |
| 178 PTHREAD_CFLAGS="`pthread-config --cflags`" | |
| 179 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`
" | |
| 180 ;; | |
| 181 | |
| 182 *) | |
| 183 AC_MSG_CHECKING([for the pthreads library -l$flag]) | |
| 184 PTHREAD_LIBS="-l$flag" | |
| 185 ;; | |
| 186 esac | |
| 187 | |
| 188 save_LIBS="$LIBS" | |
| 189 save_CFLAGS="$CFLAGS" | |
| 190 LIBS="$PTHREAD_LIBS $LIBS" | |
| 191 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
| 192 | |
| 193 # Check for various functions. We must include pthread.h, | |
| 194 # since some functions may be macros. (On the Sequent, we | |
| 195 # need a special flag -Kthread to make this header compile.) | |
| 196 # We check for pthread_join because it is in -lpthread on IRIX | |
| 197 # while pthread_create is in libc. We check for pthread_attr_init | |
| 198 # due to DEC craziness with -lpthreads. We check for | |
| 199 # pthread_cleanup_push because it is one of the few pthread | |
| 200 # functions on Solaris that doesn't have a non-functional libc stub. | |
| 201 # We try pthread_create on general principles. | |
| 202 AC_TRY_LINK([#include <pthread.h>], | |
| 203 [pthread_t th; pthread_join(th, 0); | |
| 204 pthread_attr_init(0); pthread_cleanup_push(0, 0); | |
| 205 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], | |
| 206 [acx_pthread_ok=yes]) | |
| 207 | |
| 208 LIBS="$save_LIBS" | |
| 209 CFLAGS="$save_CFLAGS" | |
| 210 | |
| 211 AC_MSG_RESULT($acx_pthread_ok) | |
| 212 if test "x$acx_pthread_ok" = xyes; then | |
| 213 break; | |
| 214 fi | |
| 215 | |
| 216 PTHREAD_LIBS="" | |
| 217 PTHREAD_CFLAGS="" | |
| 218 done | |
| 219 fi | |
| 220 | |
| 221 # Various other checks: | |
| 222 if test "x$acx_pthread_ok" = xyes; then | |
| 223 save_LIBS="$LIBS" | |
| 224 LIBS="$PTHREAD_LIBS $LIBS" | |
| 225 save_CFLAGS="$CFLAGS" | |
| 226 CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
| 227 | |
| 228 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. | |
| 229 AC_MSG_CHECKING([for joinable pthread attribute]) | |
| 230 attr_name=unknown | |
| 231 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do | |
| 232 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], | |
| 233 [attr_name=$attr; break]) | |
| 234 done | |
| 235 AC_MSG_RESULT($attr_name) | |
| 236 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then | |
| 237 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, | |
| 238 [Define to necessary symbol if this constant | |
| 239 uses a non-standard name on your system.]) | |
| 240 fi | |
| 241 | |
| 242 AC_MSG_CHECKING([if more special flags are required for pthreads]) | |
| 243 flag=no | |
| 244 case "${host_cpu}-${host_os}" in | |
| 245 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; | |
| 246 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; | |
| 247 esac | |
| 248 AC_MSG_RESULT(${flag}) | |
| 249 if test "x$flag" != xno; then | |
| 250 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" | |
| 251 fi | |
| 252 | |
| 253 LIBS="$save_LIBS" | |
| 254 CFLAGS="$save_CFLAGS" | |
| 255 | |
| 256 # More AIX lossage: must compile with xlc_r or cc_r | |
| 257 if test x"$GCC" != xyes; then | |
| 258 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) | |
| 259 else | |
| 260 PTHREAD_CC=$CC | |
| 261 fi | |
| 262 else | |
| 263 PTHREAD_CC="$CC" | |
| 264 fi | |
| 265 | |
| 266 AC_SUBST(PTHREAD_LIBS) | |
| 267 AC_SUBST(PTHREAD_CFLAGS) | |
| 268 AC_SUBST(PTHREAD_CC) | |
| 269 | |
| 270 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
| 271 if test x"$acx_pthread_ok" = xyes; then | |
| 272 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads
libraries and header files.]),[$1]) | |
| 273 : | |
| 274 else | |
| 275 acx_pthread_ok=no | |
| 276 $2 | |
| 277 fi | |
| 278 AC_LANG_RESTORE | |
| 279 ])dnl ACX_PTHREAD | |
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Chromium Code Reviews
Issue 12568011:
Update XZ Utils to 5.0.4 (third_party) (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/xz/