Delete remaining #include "c-tree.h" from backend files

["Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>]

This patch cleans up the remaining places where we include "c-tree.h"
in backend files.  (I need to clean this for something else I'm
working on, details later.  But it's a good idea IMHO regardless.)

In the cases of the ${cpu}.c files, I couldn't find any negative
consequence from removing it.  (I.e. no additional warnings or missing
decls.)  If it's truly necessary for something, my understanding is
that the correct mechanism is to create a ${cpu}-c.c file and link
that only into the C frontend via `c_target_objs'.  Having it in plain
${cpu}.c is a potential conflict whenever compiling/linking non-C
frontends.

In the langhooks.c case, that file is also included in libbackend.a so
it shouldn't be including a frontend tree header either.  It seems to
have included "c-tree.h" to obtain a prototype for the `poplevel'
function.  This function is required to be defined by all language
frontends.  As such, I put a definition in tree.h so it's handled just
like `builtin_function'.  I.e. declared in a frontend-neutral file.

The remaining includes of c-tree.h were all in C/objc frontend files.
Also there was one in config/darwin-c.c which, if I understand things
correctly, is the right place to do it.

This patch was bootstrapped on sparc-sun-solaris2.7 (minus java), no
regressions.  And I also ran the c4x and hppa subset in my target
farm.  I built cc1/xgcc cross-compilers for the following targets, all
compiled successfully:


c4x-unknown-elf c4x-unknown-rtems

hppa1.0-hp-hpux10 hppa1.0-hp-hpux11 hppa1.1-hp-hpux10
hppa1.1-hp-hpux11 hppa1.1-unknown-bsd hppa1.1-unknown-linux-gnu
hppa1.1-unknown-osf hppa1.1-unknown-proelf hppa1.1-unknown-rtems
hppa64-hp-hpux11 hppa64-unknown-linux-gnu

Ok to install?

		Thanks,
		--Kaveh

PS: I didn't see any Makefile dependencies related to these.


2003-06-15  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>

	* config/c4x/c4x.c: Don't include "c-tree.h".
	* config/pa/pa.c: Likewise.
	* langhooks.c: Likewise.
	* tree.h (poplevel): Declare.

diff -rup orig/egcc-CVS20030615/gcc/config/c4x/c4x.c egcc-CVS20030615/gcc/config/c4x/c4x.c
--- orig/egcc-CVS20030615/gcc/config/c4x/c4x.c	2003-06-07 20:01:49.000000000 -0400
+++ egcc-CVS20030615/gcc/config/c4x/c4x.c	2003-06-15 19:22:33.126490000 -0400
@@ -44,7 +44,6 @@ Boston, MA 02111-1307, USA.  */
 #include "flags.h"
 #include "loop.h"
 #include "recog.h"
-#include "c-tree.h"
 #include "ggc.h"
 #include "cpplib.h"
 #include "toplev.h"
diff -rup orig/egcc-CVS20030615/gcc/config/pa/pa.c egcc-CVS20030615/gcc/config/pa/pa.c
--- orig/egcc-CVS20030615/gcc/config/pa/pa.c	2003-06-13 10:10:23.000000000 -0400
+++ egcc-CVS20030615/gcc/config/pa/pa.c	2003-06-15 19:17:16.613718000 -0400
@@ -39,7 +39,6 @@ Boston, MA 02111-1307, USA.  */
 #include "optabs.h"
 #include "libfuncs.h"
 #include "reload.h"
-#include "c-tree.h"
 #include "integrate.h"
 #include "function.h"
 #include "obstack.h"
diff -rup orig/egcc-CVS20030615/gcc/langhooks.c egcc-CVS20030615/gcc/langhooks.c
--- orig/egcc-CVS20030615/gcc/langhooks.c	2003-06-11 20:01:20.000000000 -0400
+++ egcc-CVS20030615/gcc/langhooks.c	2003-06-15 18:37:38.277314000 -0400
@@ -25,7 +25,6 @@ Boston, MA 02111-1307, USA.  */
 #include "tm.h"
 #include "toplev.h"
 #include "tree.h"
-#include "c-tree.h"
 #include "tree-inline.h"
 #include "rtl.h"
 #include "insn-config.h"
diff -rup orig/egcc-CVS20030615/gcc/tree.h egcc-CVS20030615/gcc/tree.h
--- orig/egcc-CVS20030615/gcc/tree.h	2003-06-14 14:32:17.000000000 -0400
+++ egcc-CVS20030615/gcc/tree.h	2003-06-15 18:42:19.712431000 -0400
@@ -2644,6 +2644,10 @@ extern GTY(()) tree current_function_fun
 
 extern int all_types_permanent;
 
+/* Exit a binding level.  This function is provided by each language
+   frontend.  */
+extern tree poplevel (int, int, int);
+
 /* Declare a predefined function.  Return the declaration.  This function is
    provided by each language frontend.  */
 extern tree builtin_function		PARAMS ((const char *, tree, int,