[build, doc] Remove --enable-threads=solaris support

[Rainer Orth]

We still have support for --enable-threads=solaris (the old Unix
International thread library) in GCC.  This is pretty pointless IMO:

* Both libthread and libpthread are only two different interfaces to the
  same implementation.

* Most of our runtime libraries don't support libthread at all.

* The support is barely tested if at all, and has created user confusion
  who assumed that they should configure with --enable-threads=solaris
  when building on Solaris.  I've already clarified install.texi to
  avoid this.

The following patch removes (hopefully) all remnants of that support,
both in code and docs.

Tested by a i386-pc-solaris2.11 bootstrap without regressions and
verifying that a --enable-threads=solaris runs into the expected error
configuring gcc.

Will apply to mainline soon.

	Rainer


2011-03-20  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* gthr-solaris.h: Remove.
	* gthr.h (_SOLARIS_THREADS): Don't include gthr-solaris.h, remove.
	* config/sol2.h (CPP_SUBTARGET_SPEC): Remove -threads support.
	(LIB_SPEC): Likewise.
	* config/sol2.opt (threads): Remove.
	* config.gcc (i[34567]86-*-solaris2*): Remove solaris threads
	support.
	(sparc*-*-solaris2*): Likewise.
	* configure.ac (enable_threads): Enable solaris support.
	* configure: Regenerate.
	* doc/invoke.texi (Option Summary, Solaris 2 Options): Remove
	-threads.
	* doc/install.texi (Configuration, --enable-threads=lib): Remove
	solaris.

	boehm-gc:
	* configure.ac (THREADS): Remove solaris.
	* configure: Regenerate.

	libjava:
	* configure.ac (THREADS): Remove solaris.
	* configure: Regenerate.

diff -r 5ba1687bfdfd boehm-gc/configure.ac
--- a/boehm-gc/configure.ac	Sun Mar 20 21:48:36 2011 +0100
+++ b/boehm-gc/configure.ac	Sun Mar 20 22:14:54 2011 +0100
@@ -235,7 +235,7 @@
     AC_DEFINE(GC_AIX_THREADS,1)
     AC_DEFINE(_REENTRANT,1)
     ;;
- decosf1 | irix | mach | os2 | solaris | dce | vxworks)
+ decosf1 | irix | mach | os2 | dce | vxworks)
     AC_MSG_ERROR(thread package $THREADS not yet supported)
     ;;
  *)
diff -r 5ba1687bfdfd gcc/config.gcc
--- a/gcc/config.gcc	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/config.gcc	Sun Mar 20 22:14:54 2011 +0100
@@ -1433,9 +1433,6 @@
 	  "":yes:* | yes:yes:* )
 		thread_file=posix
 		;;
-	  "":*:yes | yes:*:yes )
-		thread_file=solaris
-		;;
 	esac
 	;;
 i[4567]86-wrs-vxworks|i[4567]86-wrs-vxworksae)
@@ -2610,9 +2607,6 @@
 	  "":yes:* | yes:yes:* )
 		thread_file=posix
 		;;
-	  "":*:yes | yes:*:yes )
-		thread_file=solaris
-		;;
 	esac
 	;;
 sparc-wrs-vxworks)
diff -r 5ba1687bfdfd gcc/config/sol2.h
--- a/gcc/config/sol2.h	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/config/sol2.h	Sun Mar 20 22:14:54 2011 +0100
@@ -83,7 +83,6 @@
 #undef CPP_SUBTARGET_SPEC
 #define CPP_SUBTARGET_SPEC "\
 %{pthreads|pthread:-D_REENTRANT -D_PTHREADS} \
-%{!pthreads:%{!pthread:%{threads:-D_REENTRANT -D_SOLARIS_THREADS}}} \
 %{compat-bsd:-iwithprefixbefore ucbinclude -I/usr/ucbinclude} \
 "
 
@@ -137,8 +136,6 @@
    %{!symbolic:\
      %{pthreads|pthread:" \
         LIB_THREAD_LDFLAGS_SPEC " -lpthread " LIB_TLS_SPEC "} \
-     %{!pthreads:%{!pthread:%{threads:" \
-	LIB_THREAD_LDFLAGS_SPEC " -lthread}}} \
      %{p|pg:-ldl} -lc}"
 
 #undef  ENDFILE_SPEC
diff -r 5ba1687bfdfd gcc/config/sol2.opt
--- a/gcc/config/sol2.opt	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/config/sol2.opt	Sun Mar 20 22:14:54 2011 +0100
@@ -42,6 +42,3 @@
 
 rdynamic
 Driver
-
-threads
-Driver
diff -r 5ba1687bfdfd gcc/configure.ac
--- a/gcc/configure.ac	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/configure.ac	Sun Mar 20 22:14:54 2011 +0100
@@ -1332,7 +1332,7 @@
     target_thread_file='single'
     ;;
   aix | dce | gnat | irix | posix | posix95 | rtems | \
-  single | solaris | vxworks | win32 | mipssde)
+  single | vxworks | win32 | mipssde)
     target_thread_file=${enable_threads}
     ;;
   *)
diff -r 5ba1687bfdfd gcc/doc/install.texi
--- a/gcc/doc/install.texi	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/doc/install.texi	Sun Mar 20 22:14:54 2011 +0100
@@ -1129,9 +1129,6 @@
 RTEMS thread support.
 @item single
 Disable thread support, should work for all platforms.
-@item solaris
-Sun Solaris 2/Unix International thread support.  Only use this if you
-really need to use this legacy API instead of the default, @samp{posix}.
 @item vxworks
 VxWorks thread support.
 @item win32
diff -r 5ba1687bfdfd gcc/doc/invoke.texi
--- a/gcc/doc/invoke.texi	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/doc/invoke.texi	Sun Mar 20 22:14:54 2011 +0100
@@ -854,7 +854,7 @@
 
 @emph{Solaris 2 Options}
 @gccoptlist{-mimpure-text  -mno-impure-text @gol
--threads -pthreads -pthread}
+-pthreads -pthread}
 
 @emph{SPARC Options}
 @gccoptlist{-mcpu=@var{cpu-type} @gol
@@ -16931,13 +16931,6 @@
 These switches are supported in addition to the above on Solaris 2:
 
 @table @gcctabopt
-@item -threads
-@opindex threads
-Add support for multithreading using the Solaris threads library.  This
-option sets flags for both the preprocessor and linker.  This option does
-not affect the thread safety of object code produced by the compiler or
-that of libraries supplied with it.
-
 @item -pthreads
 @opindex pthreads
 Add support for multithreading using the POSIX threads library.  This
diff -r 5ba1687bfdfd gcc/gthr.h
--- a/gcc/gthr.h	Sun Mar 20 21:48:36 2011 +0100
+++ b/gcc/gthr.h	Sun Mar 20 22:14:54 2011 +0100
@@ -1,6 +1,7 @@
 /* Threads compatibility routines for libgcc2.  */
 /* Compile this one with gcc.  */
-/* Copyright (C) 1997, 1998, 2004, 2008, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 2004, 2008, 2009, 2011
+   Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -136,7 +137,6 @@
      POSIX/Unix98 threads with -D_PTHREADS
      POSIX/Unix95 threads with -D_PTHREADS95
      DCE threads with -D_DCE_THREADS
-     Solaris/UI threads with -D_SOLARIS_THREADS
 
 */
 
@@ -149,8 +149,6 @@
 #include "gthr-posix95.h"
 #elif _DCE_THREADS
 #include "gthr-dce.h"
-#elif _SOLARIS_THREADS
-#include "gthr-solaris.h"
 
 /* Include GTHREAD_FILE if one is defined.  */
 #elif defined(HAVE_GTHR_DEFAULT)
diff -r 5ba1687bfdfd libjava/configure.ac
--- a/libjava/configure.ac	Sun Mar 20 21:48:36 2011 +0100
+++ b/libjava/configure.ac	Sun Mar 20 22:14:54 2011 +0100
@@ -1033,7 +1033,7 @@
     ;;
  win32)
     ;;
- decosf1 | irix | mach | os2 | solaris | dce | vxworks)
+ decosf1 | irix | mach | os2 | dce | vxworks)
     AC_MSG_ERROR(thread package $THREADS not yet supported)
     ;;
  *)

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University