Add support for #pragma pack(push,<n>) and #pragma pack(pop).

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@22710 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 57 insertions, 7 deletions

diff --git a/gcc/c-pragma.h b/gcc/c-pragma.h
index 5478977608e..d7a383df4a4 100644
--- a/gcc/c-pragma.h
+++ b/gcc/c-pragma.h
@@ -18,33 +18,83 @@ along with GNU CC; see the file COPYING.  If not, write to
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
-#ifdef HANDLE_SYSV_PRAGMA
+#ifndef _C_PRAGMA_H
+#define _C_PRAGMA_H
 
+#ifdef HANDLE_SYSV_PRAGMA
 /* Support #pragma weak iff ASM_WEAKEN_LABEL and ASM_OUTPUT_DEF are
    defined.  */
 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 #define HANDLE_PRAGMA_WEAK SUPPORTS_WEAK
 #endif
 
+/* We always support #pragma pack for SYSV pragmas.  */
+#ifndef HANDLE_PRAGMA_PACK
+#define HANDLE_PRAGMA_PACK 1
+#endif
+#endif /* HANDLE_SYSV_PRAGMA */
+
+
+#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
+/* If we are supporting #pragma pack(push... then we automatically
+   support #pragma pack(<n>)  */
+#define HANDLE_PRAGMA_PACK 1
+#define PRAGMA_INSERT_ATTRIBUTES(node, pattr, prefix_attr) \
+  insert_pack_attributes (node, pattr, prefix_attr)
+extern void insert_pack_attributes PROTO((tree, tree *, tree *));
+#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
+
+
+#ifdef HANDLE_PRAGMA_WEAK
+/* This structure contains any weak symbol declarations waiting to be emitted.  */
+struct weak_syms
+{
+  struct weak_syms * next;
+  char * name;
+  char * value;
+};
+
+/* Declared in varasm.c */
+extern struct weak_syms * weak_decls;
+#endif /* HANDLE_PRAGMA_WEAK */
+
+
+#if defined HANDLE_PRAGMA_PACK || defined HANDLE_PRAGMA_WEAK
+/* Define HANDLE_GENERIC_PRAGMAS if any kind of front-end pragma
+   parsing is to be done.  The code in GCC's generic C source files
+   will only look for the definition of this constant.  They will
+   ignore definitions of HANDLE_PRAGMA_PACk and so on.  */
+#define HANDLE_GENERIC_PRAGMAS 1
+#endif
+
+
+#ifdef HANDLE_GENERIC_PRAGMAS
 enum pragma_state
 {
   ps_start,
   ps_done,
-  ps_bad,
+#ifdef HANDLE_PRAGMA_WEAK
   ps_weak,
   ps_name,
   ps_equals,
   ps_value,
+#endif
+#ifdef HANDLE_PRAGMA_PACK
   ps_pack,
   ps_left,
   ps_align,
-  ps_right
+  ps_right,
+#endif
+#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
+  ps_push,
+  ps_pop,
+  ps_comma,
+#endif
+  ps_bad
 };
 
-/* Output asm to handle ``#pragma weak'' */
-extern void handle_pragma_weak PROTO((enum pragma_state, char *, char *));
-
 /* Handle a C style pragma */
 extern int handle_pragma_token PROTO((char *, tree));
 
-#endif /* HANDLE_SYSV_PRAGMA */
+#endif /* HANDLE_GENERIC_PRAGMAS */
+#endif /* _C_PRAGMA_H */