--- embedaddon/libiconv/srcm4/threadlib.m4 2012/05/29 09:29:44 1.1.1.2 +++ embedaddon/libiconv/srcm4/threadlib.m4 2021/03/17 13:38:46 1.1.1.3 @@ -1,11 +1,13 @@ -# threadlib.m4 serial 8 (gettext-0.18.2) -dnl Copyright (C) 2005-2011 Free Software Foundation, Inc. +# threadlib.m4 serial 16 +dnl Copyright (C) 2005-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl From Bruno Haible. +AC_PREREQ([2.60]) + dnl gl_THREADLIB dnl ------------ dnl Tests for a multithreading library to be used. @@ -15,14 +17,14 @@ dnl default is 'no', otherwise it is system dependent. dnl can change the choice through the options --enable-threads=choice or dnl --disable-threads. dnl Defines at most one of the macros USE_POSIX_THREADS, USE_SOLARIS_THREADS, -dnl USE_PTH_THREADS, USE_WIN32_THREADS +dnl USE_PTH_THREADS, USE_WINDOWS_THREADS dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use dnl in a Makefile (LIBTHREAD for use without libtool, LTLIBTHREAD for use with dnl libtool). dnl Sets the variables LIBMULTITHREAD and LTLIBMULTITHREAD similarly, for dnl programs that really need multithread functionality. The difference dnl between LIBTHREAD and LIBMULTITHREAD is that on platforms supporting weak -dnl symbols, typically LIBTHREAD="" whereas LIBMULTITHREAD="-lpthread". +dnl symbols, typically LIBTHREAD is empty whereas LIBMULTITHREAD is not. dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for dnl multithread-safe programs. @@ -43,17 +45,13 @@ AC_DEFUN([gl_THREADLIB_EARLY_BODY], AC_REQUIRE([AC_CANONICAL_HOST]) dnl _GNU_SOURCE is needed for pthread_rwlock_t on glibc systems. - dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes - dnl AC_GNU_SOURCE. - m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], - [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])], - [AC_REQUIRE([AC_GNU_SOURCE])]) + AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) dnl Check for multithreading. m4_ifdef([gl_THREADLIB_DEFAULT_NO], [m4_divert_text([DEFAULTS], [gl_use_threads_default=no])], [m4_divert_text([DEFAULTS], [gl_use_threads_default=])]) AC_ARG_ENABLE([threads], -AC_HELP_STRING([--enable-threads={posix|solaris|pth|win32}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [ +AC_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [ AC_HELP_STRING([--disable-threads], [build without multithread safety])]), [gl_use_threads=$enableval], [if test -n "$gl_use_threads_default"; then @@ -66,7 +64,7 @@ changequote(,)dnl dnl child process gets an endless segmentation fault inside execvp(). dnl Disable multithreading by default on Cygwin 1.5.x, because it has dnl bugs that lead to endless loops or crashes. See - dnl . + dnl . osf*) gl_use_threads=no ;; cygwin*) case `uname -r` in @@ -148,6 +146,10 @@ int main () [gl_cv_have_weak="guessing no"]) ]) fi + dnl But when linking statically, weak symbols don't work. + case " $LDFLAGS " in + *" -static "*) gl_cv_have_weak=no ;; + esac ]) if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that @@ -162,15 +164,31 @@ int main () # Test whether both pthread_mutex_lock and pthread_mutexattr_init exist # in libc. IRIX 6.5 has the first one in both libc and libpthread, but # the second one only in libpthread, and lock.c needs it. - AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#include ]], - [[pthread_mutex_lock((pthread_mutex_t*)0); - pthread_mutexattr_init((pthread_mutexattr_t*)0);]])], - [gl_have_pthread=yes]) + # + # If -pthread works, prefer it to -lpthread, since Ubuntu 14.04 + # needs -pthread for some reason. See: + # https://lists.gnu.org/r/bug-gnulib/2014-09/msg00023.html + save_LIBS=$LIBS + for gl_pthread in '' '-pthread'; do + LIBS="$LIBS $gl_pthread" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include + pthread_mutex_t m; + pthread_mutexattr_t ma; + ]], + [[pthread_mutex_lock (&m); + pthread_mutexattr_init (&ma);]])], + [gl_have_pthread=yes + LIBTHREAD=$gl_pthread LTLIBTHREAD=$gl_pthread + LIBMULTITHREAD=$gl_pthread LTLIBMULTITHREAD=$gl_pthread]) + LIBS=$save_LIBS + test -n "$gl_have_pthread" && break + done + # Test for libpthread by looking for pthread_kill. (Not pthread_self, # since it is defined as a macro on OSF/1.) - if test -n "$gl_have_pthread"; then + if test -n "$gl_have_pthread" && test -z "$LIBTHREAD"; then # The program links fine without libpthread. But it may actually # need to link with libpthread in order to create multiple threads. AC_CHECK_LIB([pthread], [pthread_kill], @@ -179,13 +197,15 @@ int main () # Therefore pthread_in_use() needs to actually try to create a # thread: pthread_create from libc will fail, whereas # pthread_create will actually create a thread. + # On Solaris 10 or newer, this test is no longer needed, because + # libc contains the fully functional pthread functions. case "$host_os" in - solaris* | hpux*) + solaris | solaris2.[1-9] | solaris2.[1-9].* | hpux*) AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1], [Define if the pthread_in_use() detection is hard.]) esac ]) - else + elif test -z "$gl_have_pthread"; then # Some library is needed. Try libpthread and libc_r. AC_CHECK_LIB([pthread], [pthread_kill], [gl_have_pthread=yes @@ -276,17 +296,19 @@ int main () fi fi if test -z "$gl_have_pthread"; then - if test "$gl_use_threads" = yes || test "$gl_use_threads" = win32; then - if { case "$host_os" in - mingw*) true;; - *) false;; - esac - }; then - gl_threads_api=win32 - AC_DEFINE([USE_WIN32_THREADS], [1], - [Define if the Win32 multithreading API can be used.]) - fi - fi + case "$gl_use_threads" in + yes | windows | win32) # The 'win32' is for backward compatibility. + if { case "$host_os" in + mingw*) true;; + *) false;; + esac + }; then + gl_threads_api=windows + AC_DEFINE([USE_WINDOWS_THREADS], [1], + [Define if the native Windows multithreading API can be used.]) + fi + ;; + esac fi fi AC_MSG_CHECKING([for multithread API to use]) @@ -317,50 +339,52 @@ AC_DEFUN([gl_DISABLE_THREADS], [ dnl Survey of platforms: dnl -dnl Platform Available Compiler Supports test-lock -dnl flavours option weak result -dnl --------------- --------- --------- -------- --------- -dnl Linux 2.4/glibc posix -lpthread Y OK +dnl Platform Available Compiler Supports test-lock +dnl flavours option weak result +dnl --------------- --------- --------- -------- --------- +dnl Linux 2.4/glibc posix -lpthread Y OK dnl -dnl GNU Hurd/glibc posix +dnl GNU Hurd/glibc posix dnl -dnl FreeBSD 5.3 posix -lc_r Y -dnl posix -lkse ? Y -dnl posix -lpthread ? Y -dnl posix -lthr Y +dnl Ubuntu 14.04 posix -pthread Y OK dnl -dnl FreeBSD 5.2 posix -lc_r Y -dnl posix -lkse Y -dnl posix -lthr Y +dnl FreeBSD 5.3 posix -lc_r Y +dnl posix -lkse ? Y +dnl posix -lpthread ? Y +dnl posix -lthr Y dnl -dnl FreeBSD 4.0,4.10 posix -lc_r Y OK +dnl FreeBSD 5.2 posix -lc_r Y +dnl posix -lkse Y +dnl posix -lthr Y dnl -dnl NetBSD 1.6 -- +dnl FreeBSD 4.0,4.10 posix -lc_r Y OK dnl -dnl OpenBSD 3.4 posix -lpthread Y OK +dnl NetBSD 1.6 -- dnl -dnl MacOS X 10.[123] posix -lpthread Y OK +dnl OpenBSD 3.4 posix -lpthread Y OK dnl -dnl Solaris 7,8,9 posix -lpthread Y Sol 7,8: 0.0; Sol 9: OK -dnl solaris -lthread Y Sol 7,8: 0.0; Sol 9: OK +dnl Mac OS X 10.[123] posix -lpthread Y OK dnl -dnl HP-UX 11 posix -lpthread N (cc) OK +dnl Solaris 7,8,9 posix -lpthread Y Sol 7,8: 0.0; Sol 9: OK +dnl solaris -lthread Y Sol 7,8: 0.0; Sol 9: OK +dnl +dnl HP-UX 11 posix -lpthread N (cc) OK dnl Y (gcc) dnl -dnl IRIX 6.5 posix -lpthread Y 0.5 +dnl IRIX 6.5 posix -lpthread Y 0.5 dnl -dnl AIX 4.3,5.1 posix -lpthread N AIX 4: 0.5; AIX 5: OK +dnl AIX 4.3,5.1 posix -lpthread N AIX 4: 0.5; AIX 5: OK dnl -dnl OSF/1 4.0,5.1 posix -pthread (cc) N OK +dnl OSF/1 4.0,5.1 posix -pthread (cc) N OK dnl -lpthread (gcc) Y dnl -dnl Cygwin posix -lpthread Y OK +dnl Cygwin posix -lpthread Y OK dnl -dnl Any of the above pth -lpth 0.0 +dnl Any of the above pth -lpth 0.0 dnl -dnl Mingw win32 N OK +dnl Mingw windows N OK dnl -dnl BeOS 5 -- +dnl BeOS 5 -- dnl dnl The test-lock result shows what happens if in test-lock.c EXPLICIT_YIELD is dnl turned off: