target.h (struct gcc_target): Add new field to struct cxx: import_export_class.

* target.h (struct gcc_target): Add new field to struct cxx: import_export_class.
* target-def.h (TARGET_CXX): Initialise the new field.
  (TARGET_CXX_IMPORT_EXPORT_CLASS): Provide a default value for the new field.
* doc/tm.texi: Document the new target hook.
* decl2.c (import_export_class): Invoke the import_export_class field in the
  gcc_target structure if it is not empty.

From-SVN: r83964

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 5f32581..a5455b0 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -8495,6 +8495,15 @@ This hook should return @code{true} if the element size should be stored in
 array cookies.  The default is to return @code{false}.
 @end deftypefn
 
+@deftypefn {Target Hook} int TARGET_CXX_IMPORT_EXPORT_CLASS (tree  @var{type}, int @var{import_export})
+If defined by a backend this hook allows the decision made to export
+class @var{type} to be overruled.  Upon entry @var{import_export}
+will contain 1 if the class is going to be exported, -1 if it is going
+to be imported and 0 otherwise.  This function should return the
+modified value and perform any other actions necessary to support the
+backend's targeted operating system.
+@end deftypefn
+
 @node Misc
 @section Miscellaneous Parameters
 @cindex parameters, miscellaneous