invoke.texi (fconserve-space): Remove documentation.

gcc/
	* doc/invoke.texi (fconserve-space): Remove documentation.

c-family/
	* c.opt (fconserve-space): Turn into a no-op.

cp/
	* decl.c: Do not include output.h.
	(start_decl): Remove code for flag_conserve_space.

testsuite/
	* g++.old-deja/g++.brendan/array1.C: Remove dg-options.

From-SVN: r188282

gcc/ChangeLog

+2012-06-06  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* doc/invoke.texi (fconserve-space): Remove documentation.
+
 2012-06-06  Edmar Wienskoski  <edmar@freescale.com>
 
 	* config/rs6000/rs6000-tables.opt: Regenerated.

gcc/c-family/ChangeLog

+2012-06-06  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* c.opt (fconserve-space): Turn into a no-op.
+
 2012-06-04  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* c-common.c: Do not include output.h.

gcc/c-family/c.opt

@@ -762,7 +762,7 @@ Allow the arguments of the '?' operator to have different types
 
 fconserve-space
 C++ ObjC++ Var(flag_conserve_space)
-Reduce the size of object files
+Does nothing.  Preserved for backward compatibility.
 
 fconstant-string-class=
 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)

gcc/cp/ChangeLog

+2012-06-06  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* decl.c: Do not include output.h.
+	(start_decl): Remove code for flag_conserve_space.
+
 2012-06-06  Fabien Chne  <fabien@gcc.gnu.org>
 
 	PR c++/52841

gcc/cp/decl.c

@@ -39,7 +39,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-inline.h"
 #include "decl.h"
 #include "intl.h"
-#include "output.h" /* for have_global_bss_p */
 #include "toplev.h"
 #include "hashtab.h"
 #include "tm_p.h"
@@ -4528,18 +4527,6 @@ start_decl (const cp_declarator *declarator,
   if (decl == error_mark_node)
     return error_mark_node;
 
-  /* Tell the back end to use or not use .common as appropriate.  If we say
-     -fconserve-space, we want this to save .data space, at the expense of
-     wrong semantics.  If we say -fno-conserve-space, we want this to
-     produce errors about redefs; to do this we force variables into the
-     data segment.  */
-  if (flag_conserve_space
-      && TREE_CODE (decl) == VAR_DECL
-      && TREE_PUBLIC (decl)
-      && !DECL_THREAD_LOCAL_P (decl)
-      && !have_global_bss_p ())
-    DECL_COMMON (decl) = 1;
-
   if (TREE_CODE (decl) == VAR_DECL
       && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
       && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))

gcc/doc/invoke.texi

@@ -182,7 +182,7 @@ in the following sections.
 @item C++ Language Options
 @xref{C++ Dialect Options,,Options Controlling C++ Dialect}.
 @gccoptlist{-fabi-version=@var{n}  -fno-access-control  -fcheck-new @gol
--fconserve-space  -fconstexpr-depth=@var{n}  -ffriend-injection @gol
+-fconstexpr-depth=@var{n}  -ffriend-injection @gol
 -fno-elide-constructors @gol
 -fno-enforce-eh-specs @gol
 -ffor-scope  -fno-for-scope  -fno-gnu-keywords @gol
@@ -1947,18 +1947,6 @@ return value even without this option.  In all other cases, when
 exhaustion is signalled by throwing @code{std::bad_alloc}.  See also
 @samp{new (nothrow)}.
 
-@item -fconserve-space
-@opindex fconserve-space
-Put uninitialized or run-time-initialized global variables into the
-common segment, as C does.  This saves space in the executable at the
-cost of not diagnosing duplicate definitions.  If you compile with this
-flag and your program mysteriously crashes after @code{main()} has
-completed, you may have an object that is being destroyed twice because
-two definitions are merged.
-
-This option is no longer useful on most targets, now that support has
-been added for putting variables into BSS without making them common.
-
 @item -fconstexpr-depth=@var{n}
 @opindex fconstexpr-depth
 Set the maximum nested evaluation depth for C++11 constexpr functions

gcc/testsuite/ChangeLog

+2012-06-06  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* g++.old-deja/g++.brendan/array1.C: Remove dg-options.
+
 2012-06-06  Uros Bizjak  <ubizjak@gmail.com>
 
 	* gcc.target/i386/avx-os-support.h (XCR_XFEATURE_ENABLED_MASK): New.

gcc/testsuite/g++.old-deja/g++.brendan/array1.C

 // { dg-do assemble  }
-// { dg-options "-fconserve-space -fcommon" }
 // GROUPS passed array-bindings
 
 extern "C" int printf (const char *, ...);