[Bug target/18444] New: Multithreading broken on Unix95-class platforms

["ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The patch

2004-08-27  Jason Merrill  <jason@redhat.com>

	PR c++/13684
	* gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY.
	(gimple_push_cleanup): Add eh_only parm.
	(gimplify_target_expr): Pass it.
	* c.opt (-fno-threadsafe-statics): New option.
	* c-opts.c (c_common_handle_option): Handle it.
	* c-common.h (flag_threadsafe_statics): Declare it.
	* c-common.c (flag_threadsafe_statics): Record it.
	* doc/invoke.texi: Document it.
	* tsystem.h (_GNU_SOURCE): Define.
	* gthr-posix.h (__gthread_recursive_mutex_t): New typedef.
	(__GTHREAD_RECURSIVE_MUTEX_INIT): New macro.
	(__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro.
	(__gthread_recursive_mutex_init_function): New fn.
	(__gthread_recursive_mutex_lock): New fn.
	(__gthread_recursive_mutex_trylock): New fn.
	(__gthread_recursive_mutex_unlock): New fn.
	* gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise.
	* gthr-win32.h, gthr-vxworks.h: Likewise.
	* gthr.h: Document.

makes it impossible to build the compiler without --enable-threads=single on
Unix95-class (i.e. non Unix98-class platforms), because recursive mutexes
support is now mandatory for POSIX threads.  Among the affected platforms are
sparc-sun-solaris2.5.1 and sparc-sun-solaris2.6.

A recursive mutexes emulation was implemented in gthr-win32.h, so I think it
should be doable to do the same in gthr-posix.h (and gthr-solaris.h).

-- 
           Summary: Multithreading broken on Unix95-class platforms
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ebotcazou at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18444