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annotate src/fftw-3.3.5/m4/acx_pthread.m4 @ 83:ae30d91d2ffe

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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 2cd0e3b3e1fd
children
rev   line source
Chris@42 1 dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
Chris@42 2 dnl @summary figure out how to build C programs using POSIX threads
Chris@42 3 dnl @category InstalledPackages
Chris@42 4 dnl
Chris@42 5 dnl This macro figures out how to build C programs using POSIX
Chris@42 6 dnl threads. It sets the PTHREAD_LIBS output variable to the threads
Chris@42 7 dnl library and linker flags, and the PTHREAD_CFLAGS output variable
Chris@42 8 dnl to any special C compiler flags that are needed. (The user can also
Chris@42 9 dnl force certain compiler flags/libs to be tested by setting these
Chris@42 10 dnl environment variables.)
Chris@42 11 dnl
Chris@42 12 dnl Also sets PTHREAD_CC to any special C compiler that is needed for
Chris@42 13 dnl multi-threaded programs (defaults to the value of CC otherwise).
Chris@42 14 dnl (This is necessary on AIX to use the special cc_r compiler alias.)
Chris@42 15 dnl
Chris@42 16 dnl NOTE: You are assumed to not only compile your program with these
Chris@42 17 dnl flags, but also link it with them as well. e.g. you should link
Chris@42 18 dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
Chris@42 19 dnl
Chris@42 20 dnl If you are only building threads programs, you may wish to
Chris@42 21 dnl use these variables in your default LIBS, CFLAGS, and CC:
Chris@42 22 dnl
Chris@42 23 dnl LIBS="$PTHREAD_LIBS $LIBS"
Chris@42 24 dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
Chris@42 25 dnl CC="$PTHREAD_CC"
Chris@42 26 dnl
Chris@42 27 dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
Chris@42 28 dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE
Chris@42 29 dnl to that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
Chris@42 30 dnl
Chris@42 31 dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
Chris@42 32 dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands
Chris@42 33 dnl to run it if it is not found. If ACTION-IF-FOUND is not specified,
Chris@42 34 dnl the default action will define HAVE_PTHREAD.
Chris@42 35 dnl
Chris@42 36 dnl Please let the authors know if this macro fails on any platform,
Chris@42 37 dnl or if you have any other suggestions or comments. This macro was
Chris@42 38 dnl based on work by SGJ on autoconf scripts for FFTW (www.fftw.org)
Chris@42 39 dnl (with help from M. Frigo), as well as ac_pthread and hb_pthread
Chris@42 40 dnl macros posted by Alejandro Forero Cuervo to the autoconf macro
Chris@42 41 dnl repository. We are also grateful for the helpful feedback of
Chris@42 42 dnl numerous users.
Chris@42 43 dnl
Chris@42 44 dnl @version 2006-09-15
Chris@42 45 dnl @license GPLWithACException
Chris@42 46 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
Chris@42 47
Chris@42 48 AC_DEFUN([ACX_PTHREAD], [
Chris@42 49 AC_REQUIRE([AC_CANONICAL_HOST])
Chris@42 50 AC_LANG_SAVE
Chris@42 51 AC_LANG_C
Chris@42 52 acx_pthread_ok=no
Chris@42 53
Chris@42 54 # We used to check for pthread.h first, but this fails if pthread.h
Chris@42 55 # requires special compiler flags (e.g. on True64 or Sequent).
Chris@42 56 # It gets checked for in the link test anyway.
Chris@42 57
Chris@42 58 # First of all, check if the user has set any of the PTHREAD_LIBS,
Chris@42 59 # etcetera environment variables, and if threads linking works using
Chris@42 60 # them:
Chris@42 61 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
Chris@42 62 save_CFLAGS="$CFLAGS"
Chris@42 63 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
Chris@42 64 save_LIBS="$LIBS"
Chris@42 65 LIBS="$PTHREAD_LIBS $LIBS"
Chris@42 66 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
Chris@42 67 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
Chris@42 68 AC_MSG_RESULT($acx_pthread_ok)
Chris@42 69 if test x"$acx_pthread_ok" = xno; then
Chris@42 70 PTHREAD_LIBS=""
Chris@42 71 PTHREAD_CFLAGS=""
Chris@42 72 fi
Chris@42 73 LIBS="$save_LIBS"
Chris@42 74 CFLAGS="$save_CFLAGS"
Chris@42 75 fi
Chris@42 76
Chris@42 77 # We must check for the threads library under a number of different
Chris@42 78 # names; the ordering is very important because some systems
Chris@42 79 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
Chris@42 80 # libraries is broken (non-POSIX).
Chris@42 81
Chris@42 82 # Create a list of thread flags to try. Items starting with a "-" are
Chris@42 83 # C compiler flags, and other items are library names, except for "none"
Chris@42 84 # which indicates that we try without any flags at all, and "pthread-config"
Chris@42 85 # which is a program returning the flags for the Pth emulation library.
Chris@42 86
Chris@42 87 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt -mthreads pthread --thread-safe pthread-config"
Chris@42 88
Chris@42 89 # The ordering *is* (sometimes) important. Some notes on the
Chris@42 90 # individual items follow:
Chris@42 91
Chris@42 92 # pthreads: AIX (must check this before -lpthread)
Chris@42 93 # none: in case threads are in libc; should be tried before -Kthread and
Chris@42 94 # other compiler flags to prevent continual compiler warnings
Chris@42 95 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
Chris@42 96 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
Chris@42 97 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
Chris@42 98 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
Chris@42 99 # -pthreads: Solaris/gcc
Chris@42 100 # -mthreads: Mingw32/gcc, Lynx/gcc
Chris@42 101 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
Chris@42 102 # doesn't hurt to check since this sometimes defines pthreads too;
Chris@42 103 # also defines -D_REENTRANT)
Chris@42 104 # ... -mt is also the pthreads flag for HP/aCC
Chris@42 105 # (where it should come before -mthreads to avoid spurious warnings)
Chris@42 106 # pthread: Linux, etcetera
Chris@42 107 # --thread-safe: KAI C++
Chris@42 108 # pthread-config: use pthread-config program (for GNU Pth library)
Chris@42 109
Chris@42 110 case "${host_cpu}-${host_os}" in
Chris@42 111 *solaris*)
Chris@42 112
Chris@42 113 # On Solaris (at least, for some versions), libc contains stubbed
Chris@42 114 # (non-functional) versions of the pthreads routines, so link-based
Chris@42 115 # tests will erroneously succeed. (We need to link with -pthreads/-mt/
Chris@42 116 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
Chris@42 117 # a function called by this macro, so we could check for that, but
Chris@42 118 # who knows whether they'll stub that too in a future libc.) So,
Chris@42 119 # we'll just look for -pthreads and -lpthread first:
Chris@42 120
Chris@42 121 acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
Chris@42 122 ;;
Chris@42 123 esac
Chris@42 124
Chris@42 125 if test x"$acx_pthread_ok" = xno; then
Chris@42 126 for flag in $acx_pthread_flags; do
Chris@42 127
Chris@42 128 case $flag in
Chris@42 129 none)
Chris@42 130 AC_MSG_CHECKING([whether pthreads work without any flags])
Chris@42 131 ;;
Chris@42 132
Chris@42 133 -*)
Chris@42 134 AC_MSG_CHECKING([whether pthreads work with $flag])
Chris@42 135 PTHREAD_CFLAGS="$flag"
Chris@42 136 ;;
Chris@42 137
Chris@42 138 pthread-config)
Chris@42 139 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
Chris@42 140 if test x"$acx_pthread_config" = xno; then continue; fi
Chris@42 141 PTHREAD_CFLAGS="`pthread-config --cflags`"
Chris@42 142 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
Chris@42 143 ;;
Chris@42 144
Chris@42 145 *)
Chris@42 146 AC_MSG_CHECKING([for the pthreads library -l$flag])
Chris@42 147 PTHREAD_LIBS="-l$flag"
Chris@42 148 ;;
Chris@42 149 esac
Chris@42 150
Chris@42 151 save_LIBS="$LIBS"
Chris@42 152 save_CFLAGS="$CFLAGS"
Chris@42 153 LIBS="$PTHREAD_LIBS $LIBS"
Chris@42 154 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
Chris@42 155
Chris@42 156 # Check for various functions. We must include pthread.h,
Chris@42 157 # since some functions may be macros. (On the Sequent, we
Chris@42 158 # need a special flag -Kthread to make this header compile.)
Chris@42 159 # We check for pthread_join because it is in -lpthread on IRIX
Chris@42 160 # while pthread_create is in libc. We check for pthread_attr_init
Chris@42 161 # due to DEC craziness with -lpthreads. We check for
Chris@42 162 # pthread_cleanup_push because it is one of the few pthread
Chris@42 163 # functions on Solaris that doesn't have a non-functional libc stub.
Chris@42 164 # We try pthread_create on general principles.
Chris@42 165 AC_TRY_LINK([#include <pthread.h>],
Chris@42 166 [pthread_t th; pthread_join(th, (void**) 0);
Chris@42 167 pthread_attr_init((pthread_attr_t*) 0);
Chris@42 168 pthread_cleanup_push((void(*)(void *)) 0, (void*) 0);
Chris@42 169 pthread_create((pthread_t*) 0, (pthread_attr_t*) 0,
Chris@42 170 (void*(*)(void *)) 0, (void*) 0);
Chris@42 171 pthread_cleanup_pop(0); ],
Chris@42 172 [acx_pthread_ok=yes])
Chris@42 173
Chris@42 174 LIBS="$save_LIBS"
Chris@42 175 CFLAGS="$save_CFLAGS"
Chris@42 176
Chris@42 177 AC_MSG_RESULT($acx_pthread_ok)
Chris@42 178 if test "x$acx_pthread_ok" = xyes; then
Chris@42 179 break;
Chris@42 180 fi
Chris@42 181
Chris@42 182 PTHREAD_LIBS=""
Chris@42 183 PTHREAD_CFLAGS=""
Chris@42 184 done
Chris@42 185 fi
Chris@42 186
Chris@42 187 # Various other checks:
Chris@42 188 if test "x$acx_pthread_ok" = xyes; then
Chris@42 189 save_LIBS="$LIBS"
Chris@42 190 LIBS="$PTHREAD_LIBS $LIBS"
Chris@42 191 save_CFLAGS="$CFLAGS"
Chris@42 192 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
Chris@42 193
Chris@42 194 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
Chris@42 195 AC_MSG_CHECKING([for joinable pthread attribute])
Chris@42 196 attr_name=unknown
Chris@42 197 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
Chris@42 198 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
Chris@42 199 [attr_name=$attr; break])
Chris@42 200 done
Chris@42 201 AC_MSG_RESULT($attr_name)
Chris@42 202 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
Chris@42 203 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
Chris@42 204 [Define to necessary symbol if this constant
Chris@42 205 uses a non-standard name on your system.])
Chris@42 206 fi
Chris@42 207
Chris@42 208 AC_MSG_CHECKING([if more special flags are required for pthreads])
Chris@42 209 flag=no
Chris@42 210 case "${host_cpu}-${host_os}" in
Chris@42 211 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
Chris@42 212 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
Chris@42 213 esac
Chris@42 214 AC_MSG_RESULT(${flag})
Chris@42 215 if test "x$flag" != xno; then
Chris@42 216 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
Chris@42 217 fi
Chris@42 218
Chris@42 219 LIBS="$save_LIBS"
Chris@42 220 CFLAGS="$save_CFLAGS"
Chris@42 221
Chris@42 222 # More AIX lossage: must compile with xlc_r or cc_r
Chris@42 223 if test x"$GCC" != xyes; then
Chris@42 224 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
Chris@42 225 else
Chris@42 226 PTHREAD_CC=$CC
Chris@42 227 fi
Chris@42 228 else
Chris@42 229 PTHREAD_CC="$CC"
Chris@42 230 fi
Chris@42 231
Chris@42 232 AC_SUBST(PTHREAD_LIBS)
Chris@42 233 AC_SUBST(PTHREAD_CFLAGS)
Chris@42 234 AC_SUBST(PTHREAD_CC)
Chris@42 235
Chris@42 236 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
Chris@42 237 if test x"$acx_pthread_ok" = xyes; then
Chris@42 238 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
Chris@42 239 :
Chris@42 240 else
Chris@42 241 acx_pthread_ok=no
Chris@42 242 $2
Chris@42 243 fi
Chris@42 244 AC_LANG_RESTORE
Chris@42 245 ])dnl ACX_PTHREAD