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annotate m4/m4_ax_pthread.m4 @ 1739:c414850f206f

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Add support for -boot flag, which allows in-tree execution of Ur/Web The boot flag rewrites most hardcoded paths to point to the build directory, and also forces static compilation. This is convenient for developing Ur/Web, or if you cannot 'sudo make install' Ur/Web. The following changes were made: * Header files were moved to include/urweb instead of include; this lets FFI users point their C_INCLUDE_PATH at this directory at write <urweb/urweb.h>. For internal Ur/Web executables, we simply pass -I$PATH/include/urweb as normal. * Differentiate between LIB and SRCLIB; SRCLIB is Ur and JavaScript source files, while LIB is compiled products from libtool. For in-tree compilation these live in different places. * No longer reference Config for paths; instead use Settings; these settings can be changed dynamically by Compiler.enableBoot () (TODO: add a disableBoot function.) * config.h is now generated directly in include/urweb/config.h, for consistency's sake (especially since it gets installed along with the rest of the headers!) * All of the autotools build products got updated. * The linkStatic field in protocols now only contains the name of the build product, and not the absolute path. Future users have to be careful not to reference the Settings files to early, lest they get an old version (this was the source of two bugs during development of this patch.)
author Edward Z. Yang <ezyang@mit.edu>
date Wed, 02 May 2012 17:17:57 -0400
parents 7770ef82c463
children
rev   line source
adam@1528 1 # ===========================================================================
adam@1528 2 # http://www.gnu.org/software/autoconf-archive/ax_pthread.html
adam@1528 3 # ===========================================================================
adam@1528 4 #
adam@1528 5 # SYNOPSIS
adam@1528 6 #
adam@1528 7 # AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
adam@1528 8 #
adam@1528 9 # DESCRIPTION
adam@1528 10 #
adam@1528 11 # This macro figures out how to build C programs using POSIX threads. It
adam@1528 12 # sets the PTHREAD_LIBS output variable to the threads library and linker
adam@1528 13 # flags, and the PTHREAD_CFLAGS output variable to any special C compiler
adam@1528 14 # flags that are needed. (The user can also force certain compiler
adam@1528 15 # flags/libs to be tested by setting these environment variables.)
adam@1528 16 #
adam@1528 17 # Also sets PTHREAD_CC to any special C compiler that is needed for
adam@1528 18 # multi-threaded programs (defaults to the value of CC otherwise). (This
adam@1528 19 # is necessary on AIX to use the special cc_r compiler alias.)
adam@1528 20 #
adam@1528 21 # NOTE: You are assumed to not only compile your program with these flags,
adam@1528 22 # but also link it with them as well. e.g. you should link with
adam@1528 23 # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
adam@1528 24 #
adam@1528 25 # If you are only building threads programs, you may wish to use these
adam@1528 26 # variables in your default LIBS, CFLAGS, and CC:
adam@1528 27 #
adam@1528 28 # LIBS="$PTHREAD_LIBS $LIBS"
adam@1528 29 # CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528 30 # CC="$PTHREAD_CC"
adam@1528 31 #
adam@1528 32 # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
adam@1528 33 # has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
adam@1528 34 # (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
adam@1528 35 #
adam@1528 36 # Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
adam@1528 37 # PTHREAD_PRIO_INHERIT symbol is defined when compiling with
adam@1528 38 # PTHREAD_CFLAGS.
adam@1528 39 #
adam@1528 40 # ACTION-IF-FOUND is a list of shell commands to run if a threads library
adam@1528 41 # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
adam@1528 42 # is not found. If ACTION-IF-FOUND is not specified, the default action
adam@1528 43 # will define HAVE_PTHREAD.
adam@1528 44 #
adam@1528 45 # Please let the authors know if this macro fails on any platform, or if
adam@1528 46 # you have any other suggestions or comments. This macro was based on work
adam@1528 47 # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
adam@1528 48 # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
adam@1528 49 # Alejandro Forero Cuervo to the autoconf macro repository. We are also
adam@1528 50 # grateful for the helpful feedback of numerous users.
adam@1528 51 #
adam@1528 52 # Updated for Autoconf 2.68 by Daniel Richard G.
adam@1528 53 #
adam@1528 54 # LICENSE
adam@1528 55 #
adam@1528 56 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
adam@1528 57 # Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
adam@1528 58 #
adam@1528 59 # This program is free software: you can redistribute it and/or modify it
adam@1528 60 # under the terms of the GNU General Public License as published by the
adam@1528 61 # Free Software Foundation, either version 3 of the License, or (at your
adam@1528 62 # option) any later version.
adam@1528 63 #
adam@1528 64 # This program is distributed in the hope that it will be useful, but
adam@1528 65 # WITHOUT ANY WARRANTY; without even the implied warranty of
adam@1528 66 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
adam@1528 67 # Public License for more details.
adam@1528 68 #
adam@1528 69 # You should have received a copy of the GNU General Public License along
adam@1528 70 # with this program. If not, see <http://www.gnu.org/licenses/>.
adam@1528 71 #
adam@1528 72 # As a special exception, the respective Autoconf Macro's copyright owner
adam@1528 73 # gives unlimited permission to copy, distribute and modify the configure
adam@1528 74 # scripts that are the output of Autoconf when processing the Macro. You
adam@1528 75 # need not follow the terms of the GNU General Public License when using
adam@1528 76 # or distributing such scripts, even though portions of the text of the
adam@1528 77 # Macro appear in them. The GNU General Public License (GPL) does govern
adam@1528 78 # all other use of the material that constitutes the Autoconf Macro.
adam@1528 79 #
adam@1528 80 # This special exception to the GPL applies to versions of the Autoconf
adam@1528 81 # Macro released by the Autoconf Archive. When you make and distribute a
adam@1528 82 # modified version of the Autoconf Macro, you may extend this special
adam@1528 83 # exception to the GPL to apply to your modified version as well.
adam@1528 84
adam@1528 85 #serial 16
adam@1528 86
adam@1528 87 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
adam@1528 88 AC_DEFUN([AX_PTHREAD], [
adam@1528 89 AC_REQUIRE([AC_CANONICAL_HOST])
adam@1528 90 AC_LANG_PUSH([C])
adam@1528 91 ax_pthread_ok=no
adam@1528 92
adam@1528 93 # We used to check for pthread.h first, but this fails if pthread.h
adam@1528 94 # requires special compiler flags (e.g. on True64 or Sequent).
adam@1528 95 # It gets checked for in the link test anyway.
adam@1528 96
adam@1528 97 # First of all, check if the user has set any of the PTHREAD_LIBS,
adam@1528 98 # etcetera environment variables, and if threads linking works using
adam@1528 99 # them:
adam@1528 100 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
adam@1528 101 save_CFLAGS="$CFLAGS"
adam@1528 102 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528 103 save_LIBS="$LIBS"
adam@1528 104 LIBS="$PTHREAD_LIBS $LIBS"
adam@1528 105 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
adam@1528 106 AC_TRY_LINK_FUNC(pthread_join, ax_pthread_ok=yes)
adam@1528 107 AC_MSG_RESULT($ax_pthread_ok)
adam@1528 108 if test x"$ax_pthread_ok" = xno; then
adam@1528 109 PTHREAD_LIBS=""
adam@1528 110 PTHREAD_CFLAGS=""
adam@1528 111 fi
adam@1528 112 LIBS="$save_LIBS"
adam@1528 113 CFLAGS="$save_CFLAGS"
adam@1528 114 fi
adam@1528 115
adam@1528 116 # We must check for the threads library under a number of different
adam@1528 117 # names; the ordering is very important because some systems
adam@1528 118 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
adam@1528 119 # libraries is broken (non-POSIX).
adam@1528 120
adam@1528 121 # Create a list of thread flags to try. Items starting with a "-" are
adam@1528 122 # C compiler flags, and other items are library names, except for "none"
adam@1528 123 # which indicates that we try without any flags at all, and "pthread-config"
adam@1528 124 # which is a program returning the flags for the Pth emulation library.
adam@1528 125
adam@1528 126 ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
adam@1528 127
adam@1528 128 # The ordering *is* (sometimes) important. Some notes on the
adam@1528 129 # individual items follow:
adam@1528 130
adam@1528 131 # pthreads: AIX (must check this before -lpthread)
adam@1528 132 # none: in case threads are in libc; should be tried before -Kthread and
adam@1528 133 # other compiler flags to prevent continual compiler warnings
adam@1528 134 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
adam@1528 135 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
adam@1528 136 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
adam@1528 137 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
adam@1528 138 # -pthreads: Solaris/gcc
adam@1528 139 # -mthreads: Mingw32/gcc, Lynx/gcc
adam@1528 140 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
adam@1528 141 # doesn't hurt to check since this sometimes defines pthreads too;
adam@1528 142 # also defines -D_REENTRANT)
adam@1528 143 # ... -mt is also the pthreads flag for HP/aCC
adam@1528 144 # pthread: Linux, etcetera
adam@1528 145 # --thread-safe: KAI C++
adam@1528 146 # pthread-config: use pthread-config program (for GNU Pth library)
adam@1528 147
adam@1528 148 case "${host_cpu}-${host_os}" in
adam@1528 149 *solaris*)
adam@1528 150
adam@1528 151 # On Solaris (at least, for some versions), libc contains stubbed
adam@1528 152 # (non-functional) versions of the pthreads routines, so link-based
adam@1528 153 # tests will erroneously succeed. (We need to link with -pthreads/-mt/
adam@1528 154 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
adam@1528 155 # a function called by this macro, so we could check for that, but
adam@1528 156 # who knows whether they'll stub that too in a future libc.) So,
adam@1528 157 # we'll just look for -pthreads and -lpthread first:
adam@1528 158
adam@1528 159 ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
adam@1528 160 ;;
adam@1528 161
adam@1528 162 *-darwin*)
adam@1528 163 ax_pthread_flags="-pthread $ax_pthread_flags"
adam@1528 164 ;;
adam@1528 165 esac
adam@1528 166
adam@1528 167 if test x"$ax_pthread_ok" = xno; then
adam@1528 168 for flag in $ax_pthread_flags; do
adam@1528 169
adam@1528 170 case $flag in
adam@1528 171 none)
adam@1528 172 AC_MSG_CHECKING([whether pthreads work without any flags])
adam@1528 173 ;;
adam@1528 174
adam@1528 175 -*)
adam@1528 176 AC_MSG_CHECKING([whether pthreads work with $flag])
adam@1528 177 PTHREAD_CFLAGS="$flag"
adam@1528 178 ;;
adam@1528 179
adam@1528 180 pthread-config)
adam@1528 181 AC_CHECK_PROG(ax_pthread_config, pthread-config, yes, no)
adam@1528 182 if test x"$ax_pthread_config" = xno; then continue; fi
adam@1528 183 PTHREAD_CFLAGS="`pthread-config --cflags`"
adam@1528 184 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
adam@1528 185 ;;
adam@1528 186
adam@1528 187 *)
adam@1528 188 AC_MSG_CHECKING([for the pthreads library -l$flag])
adam@1528 189 PTHREAD_LIBS="-l$flag"
adam@1528 190 ;;
adam@1528 191 esac
adam@1528 192
adam@1528 193 save_LIBS="$LIBS"
adam@1528 194 save_CFLAGS="$CFLAGS"
adam@1528 195 LIBS="$PTHREAD_LIBS $LIBS"
adam@1528 196 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528 197
adam@1528 198 # Check for various functions. We must include pthread.h,
adam@1528 199 # since some functions may be macros. (On the Sequent, we
adam@1528 200 # need a special flag -Kthread to make this header compile.)
adam@1528 201 # We check for pthread_join because it is in -lpthread on IRIX
adam@1528 202 # while pthread_create is in libc. We check for pthread_attr_init
adam@1528 203 # due to DEC craziness with -lpthreads. We check for
adam@1528 204 # pthread_cleanup_push because it is one of the few pthread
adam@1528 205 # functions on Solaris that doesn't have a non-functional libc stub.
adam@1528 206 # We try pthread_create on general principles.
adam@1528 207 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
adam@1528 208 static void routine(void *a) { a = 0; }
adam@1528 209 static void *start_routine(void *a) { return a; }],
adam@1528 210 [pthread_t th; pthread_attr_t attr;
adam@1528 211 pthread_create(&th, 0, start_routine, 0);
adam@1528 212 pthread_join(th, 0);
adam@1528 213 pthread_attr_init(&attr);
adam@1528 214 pthread_cleanup_push(routine, 0);
adam@1528 215 pthread_cleanup_pop(0) /* ; */])],
adam@1528 216 [ax_pthread_ok=yes],
adam@1528 217 [])
adam@1528 218
adam@1528 219 LIBS="$save_LIBS"
adam@1528 220 CFLAGS="$save_CFLAGS"
adam@1528 221
adam@1528 222 AC_MSG_RESULT($ax_pthread_ok)
adam@1528 223 if test "x$ax_pthread_ok" = xyes; then
adam@1528 224 break;
adam@1528 225 fi
adam@1528 226
adam@1528 227 PTHREAD_LIBS=""
adam@1528 228 PTHREAD_CFLAGS=""
adam@1528 229 done
adam@1528 230 fi
adam@1528 231
adam@1528 232 # Various other checks:
adam@1528 233 if test "x$ax_pthread_ok" = xyes; then
adam@1528 234 save_LIBS="$LIBS"
adam@1528 235 LIBS="$PTHREAD_LIBS $LIBS"
adam@1528 236 save_CFLAGS="$CFLAGS"
adam@1528 237 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528 238
adam@1528 239 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
adam@1528 240 AC_MSG_CHECKING([for joinable pthread attribute])
adam@1528 241 attr_name=unknown
adam@1528 242 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
adam@1528 243 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
adam@1528 244 [int attr = $attr; return attr /* ; */])],
adam@1528 245 [attr_name=$attr; break],
adam@1528 246 [])
adam@1528 247 done
adam@1528 248 AC_MSG_RESULT($attr_name)
adam@1528 249 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
adam@1528 250 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
adam@1528 251 [Define to necessary symbol if this constant
adam@1528 252 uses a non-standard name on your system.])
adam@1528 253 fi
adam@1528 254
adam@1528 255 AC_MSG_CHECKING([if more special flags are required for pthreads])
adam@1528 256 flag=no
adam@1528 257 case "${host_cpu}-${host_os}" in
adam@1528 258 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
adam@1528 259 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
adam@1528 260 esac
adam@1528 261 AC_MSG_RESULT(${flag})
adam@1528 262 if test "x$flag" != xno; then
adam@1528 263 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
adam@1528 264 fi
adam@1528 265
adam@1528 266 AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
adam@1528 267 ax_cv_PTHREAD_PRIO_INHERIT, [
adam@1528 268 AC_LINK_IFELSE([
adam@1528 269 AC_LANG_PROGRAM([[#include <pthread.h>]], [[int i = PTHREAD_PRIO_INHERIT;]])],
adam@1528 270 [ax_cv_PTHREAD_PRIO_INHERIT=yes],
adam@1528 271 [ax_cv_PTHREAD_PRIO_INHERIT=no])
adam@1528 272 ])
adam@1528 273 AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
adam@1528 274 AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.]))
adam@1528 275
adam@1528 276 LIBS="$save_LIBS"
adam@1528 277 CFLAGS="$save_CFLAGS"
adam@1528 278
adam@1528 279 # More AIX lossage: must compile with xlc_r or cc_r
adam@1528 280 if test x"$GCC" != xyes; then
adam@1528 281 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
adam@1528 282 else
adam@1528 283 PTHREAD_CC=$CC
adam@1528 284 fi
adam@1528 285 else
adam@1528 286 PTHREAD_CC="$CC"
adam@1528 287 fi
adam@1528 288
adam@1528 289 AC_SUBST(PTHREAD_LIBS)
adam@1528 290 AC_SUBST(PTHREAD_CFLAGS)
adam@1528 291 AC_SUBST(PTHREAD_CC)
adam@1528 292
adam@1528 293 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
adam@1528 294 if test x"$ax_pthread_ok" = xyes; then
adam@1528 295 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
adam@1528 296 :
adam@1528 297 else
adam@1528 298 ax_pthread_ok=no
adam@1528 299 $2
adam@1528 300 fi
adam@1528 301 AC_LANG_POP
adam@1528 302 ])dnl AX_PTHREAD