target.h (struct gcc_target): Added ms_bitfield_layout_p.

* target.h (struct gcc_target): Added ms_bitfield_layout_p.
* target-def.h (TARGET_MS_BITFIELD_LAYOUT_P): New.  Added to...
(TARGET_INITIALIZER): this.
* doc/tm.texi (TARGET_MS_BITFIELD_LAYOUT_P): Document.
(BITFIELD_NBYTES_LIMITED): Markup fix.
* tree.h (default_ms_bitfield_layout_p): Declare.
(record_layout_info): Added prev_field.
* tree.c (default_ms_bitfield_layout_p): New fn.
* c-decl.c (finish_struct): Disregard EMPTY_FIELD_BOUNDARY and
PCC_BITFIELD_TYPE_MATTERS for MS bit-field layout.
* stor-layout.c: Include target.h.
(start_record_layout): Initialize prev_field.
(place_field): Handle MS bit-field layout, and disregard
EMPTY_FIELD_BOUNDARY, BITFIELD_NBYTES_LIMITED and
PCC_BITFIELD_TYPE_MATTERS in this case.  Update prev_field.
* Makefile.in (stor-layout.o): Adjust dependencies.

From-SVN: r49526

1 files changed, 10 insertions, 0 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 86c0cd0..28193e9 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -2736,6 +2736,16 @@ default_function_attribute_inlinable_p (fndecl)
   return false;
 }
 
+/* Default value of targetm.ms_bitfield_layout_p that always returns
+   false.  */
+bool
+default_ms_bitfield_layout_p (record)
+     tree record ATTRIBUTE_UNUSED;
+{
+  /* By default, GCC does not use the MS VC++ bitfield layout rules.  */
+  return false;
+}
+
 /* Return non-zero if IDENT is a valid name for attribute ATTR,
    or zero if not.