Author: pfg
Date: Sun Dec 8 03:02:44 2013
New Revision: 259092
URL: http://svnweb.freebsd.org/changeset/base/259092
Log:
gcc: new fvisibility-ms-compat option
Obtained from: gcc 4.3 (rev. 126088; GPLv2)
MFC after: 3 weeks
Modified:
head/contrib/gcc/ChangeLog.gcc43
head/contrib/gcc/c.opt
head/contrib/gcc/cp/ChangeLog.gcc43
head/contrib/gcc/cp/decl.c
head/contrib/gcc/cp/decl2.c
head/contrib/gcc/doc/invoke.texi
Modified: head/contrib/gcc/ChangeLog.gcc43
==============================================================================
--- head/contrib/gcc/ChangeLog.gcc43 Sun Dec 8 02:48:10 2013
(r259091)
+++ head/contrib/gcc/ChangeLog.gcc43 Sun Dec 8 03:02:44 2013
(r259092)
@@ -45,6 +45,12 @@
* flags.h (force_align_functions_log): Delete.
* toplev.c (force_align_functions_log): Delete.
+2007-06-28 Geoffrey Keating <geo...@apple.com> (r126088)
+
+ * doc/invoke.texi (C++ Dialect Options): Document
+ fvisibility-ms-compat.
+ * c.opt (fvisibility-ms-compat): New.
+
2007-06-05 Joerg Wunsch <j....@uriah.heep.sax.de> (r125346)
PR preprocessor/23479
Modified: head/contrib/gcc/c.opt
==============================================================================
--- head/contrib/gcc/c.opt Sun Dec 8 02:48:10 2013 (r259091)
+++ head/contrib/gcc/c.opt Sun Dec 8 03:02:44 2013 (r259092)
@@ -741,6 +741,10 @@ fvisibility-inlines-hidden
C++ ObjC++
Marks all inlined methods as having hidden visibility
+fvisibility-ms-compat
+C++ ObjC++ Var(flag_visibility_ms_compat)
+Changes visibility to match Microsoft Visual Studio by default
+
fvtable-gc
C++ ObjC++
Discard unused virtual functions
Modified: head/contrib/gcc/cp/ChangeLog.gcc43
==============================================================================
--- head/contrib/gcc/cp/ChangeLog.gcc43 Sun Dec 8 02:48:10 2013
(r259091)
+++ head/contrib/gcc/cp/ChangeLog.gcc43 Sun Dec 8 03:02:44 2013
(r259092)
@@ -7,6 +7,13 @@
* typeck.c (cxx_alignof_expr): When alignof is used on a plain
FUNCTION_DECL, return its alignment.
+2007-06-28 Geoffrey Keating <geo...@apple.com> (r126088)
+
+ * decl2.c (determine_visibility): Implement
+ flag_visibility_ms_compat effect on type info.
+ * decl.c (cxx_init_decl_processing): Implement
+ global effect of flag_visibility_ms_compat.
+
2007-06-28 Geoffrey Keating <geo...@apple.com> (r126080)
* decl2.c (start_objects): Mark constructor-runnning function
Modified: head/contrib/gcc/cp/decl.c
==============================================================================
--- head/contrib/gcc/cp/decl.c Sun Dec 8 02:48:10 2013 (r259091)
+++ head/contrib/gcc/cp/decl.c Sun Dec 8 03:02:44 2013 (r259092)
@@ -3157,6 +3157,9 @@ cxx_init_decl_processing (void)
}
if (flag_inline_functions)
flag_inline_trees = 2;
+
+ if (flag_visibility_ms_compat)
+ default_visibility = VISIBILITY_HIDDEN;
/* Initially, C. */
current_lang_name = lang_name_c;
Modified: head/contrib/gcc/cp/decl2.c
==============================================================================
--- head/contrib/gcc/cp/decl2.c Sun Dec 8 02:48:10 2013 (r259091)
+++ head/contrib/gcc/cp/decl2.c Sun Dec 8 03:02:44 2013 (r259092)
@@ -1726,6 +1726,19 @@ determine_visibility (tree decl)
but have no TEMPLATE_INFO, so don't try to check it. */
use_template = 0;
}
+ else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
+ && flag_visibility_ms_compat)
+ {
+ /* Under -fvisibility-ms-compat, types are visible by default,
+ even though their contents aren't. */
+ tree underlying_type = TREE_TYPE (DECL_NAME (decl));
+ int underlying_vis = type_visibility (underlying_type);
+ if (underlying_vis == VISIBILITY_ANON
+ || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
+ constrain_visibility (decl, underlying_vis);
+ else
+ DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
+ }
else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
{
/* tinfo visibility is based on the type it's for. */
Modified: head/contrib/gcc/doc/invoke.texi
==============================================================================
--- head/contrib/gcc/doc/invoke.texi Sun Dec 8 02:48:10 2013
(r259091)
+++ head/contrib/gcc/doc/invoke.texi Sun Dec 8 03:02:44 2013
(r259092)
@@ -186,6 +186,7 @@ in the following sections.
-frepo -fno-rtti -fstats -ftemplate-depth-@var{n} @gol
-fno-threadsafe-statics -fuse-cxa-atexit -fno-weak -nostdinc++ @gol
-fno-default-inline -fvisibility-inlines-hidden @gol
+-fvisibility-ms-compat @gol
-Wabi -Wctor-dtor-privacy @gol
-Wnon-virtual-dtor -Wreorder @gol
-Weffc++ -Wno-deprecated -Wstrict-null-sentinel @gol
@@ -1626,6 +1627,40 @@ Explicitly instantiated inline methods a
as their linkage might otherwise cross a shared library boundary.
@xref{Template Instantiation}.
+@item -fvisibility-ms-compat
+@opindex fvisibility-ms-compat
+This flag attempts to use visibility settings to make GCC's C++
+linkage model compatible with that of Microsoft Visual Studio.
+
+The flag makes these changes to GCC's linkage model:
+
+@enumerate
+@item
+It sets the default visibility to @code{hidden}, like
+@option{-fvisibility=hidden}.
+
+@item
+Types, but not their members, are not hidden by default.
+
+@item
+The One Definition Rule is relaxed for types without explicit
+visibility specifications which are defined in more than one different
+shared object: those declarations are permitted if they would have
+been permitted when this option was not used.
+@end enumerate
+
+In new code it is better to use @option{-fvisibility=hidden} and
+export those classes which are intended to be externally visible.
+Unfortunately it is possible for code to rely, perhaps accidentally,
+on the Visual Studio behaviour.
+
+Among the consequences of these changes are that static data members
+of the same type with the same name but defined in different shared
+objects will be different, so changing one will not change the other;
+and that pointers to function members defined in different shared
+objects may not compare equal. When this flag is given, it is a
+violation of the ODR to define types with the same name differently.
+
@item -fno-weak
@opindex fno-weak
Do not use weak symbol support, even if it is provided by the linker.
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