Document LTO behavior with incompatible declarations.

[pf3gnuchains/gcc-fork.git] / gcc / LANGUAGES

diff --git a/gcc/LANGUAGES b/gcc/LANGUAGES
index 31bae9f..805e9b4 100644 (file)
--- a/gcc/LANGUAGES
+++ b/gcc/LANGUAGES
@@ -6,6 +6,23 @@ time as we can formally start documenting the interface this file will
 serve as a repository for information on these interface and any incompatable
 changes we've made.
 
+2004-09-09:
+  In an effort to decrease execution time, single char tree code
+  classes were changed to enumerated values.
+
+  Old way:
+
+    DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0)
+
+  New way:
+
+    DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0)
+
+2001-02-26:
+  A DECL_INITIAL of NULL_TREE or error_mark_node in a VAR_DECL is no longer
+  taken to signify a tentative definition which should not be emitted until
+  end-of-file.  Frontends which want that behavior should set
+  DECL_DEFER_OUTPUT before calling rest_of_decl_compilation.
 
 Feb 1, 1998:
 
@@ -25,8 +42,23 @@ Feb 1, 1998:
     When a size in bits is converted into a size in bytes, which is expressed
     in trees, care should be taken to change the tree's type again to sizetype.
 
-    We've updated C, C++, Fortran & Objective-C to work with the new
-    scheme.  Other languages will need to be updated accordingly.
-    Contact amylaar@cygnus.com for additional information.
+?? 1997:
+
+  In an effort to decrease cache thrashing and useless loads we've changed the
+  third argument to the DEFTREECODE macro to be a single char.  This will
+  affect languages that defined their own tree codes (usually in a .def file).
+
+  Old way:
+
+    DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", "d", 0)
+
+  New way:
+
+    DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", 'd', 0)
 
+\f
+Copyright (C) 1998, 2001, 2002, 2004 Free Software Foundation, Inc.
 
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved.