Fix found here: http://www.freelists.org/archives/openbeos/11-2005/msg00090.html

Fixes:
In file included from ./targ-cpu.h:1,
                 from /home/dank/crosstool-new/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/binutils-2.15/gas/config/obj-elf.h:42,
                 from ./obj-format.h:1,
                 from /home/dank/crosstool-new/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/binutils-2.15/gas/config/te-linux.h:4,
                 from ./targ-env.h:1,
                 from /home/dank/crosstool-new/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/binutils-2.15/gas/as.h:626,
                 from /home/dank/crosstool-new/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/binutils-2.15/gas/app.c:30:
/home/dank/crosstool-new/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/binutils-2.15/gas/config/tc-i386.h:451: error: array type has incomplete element type
make[3]: *** [app.o] Error 1
make[3]: Leaving directory `/home/dank/crosstool-new/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.2.2/build-binutils/gas'

when building binutils-2.15 with gcc-4.0


diff -ur binutils-2.15.old/gas/as.h binutils-2.15/gas/as.h
--- binutils-2.15.old/gas/as.h	2003-11-22 18:14:21.000000000 -0800
+++ binutils-2.15/gas/as.h	2006-02-14 22:05:35.000000000 -0800
@@ -605,7 +605,26 @@
 struct expressionS;
 struct fix;
 typedef struct symbol symbolS;
-struct relax_type;
+
+/* JF moved this here from as.h under the theory that nobody except MACHINE.c
+   and write.c care about it anyway.  */
+/* [zooey]: the above no longer holds with gcc4, as it keeps bugging about
+            incomplete element types in arrays, if relax_type isn't defined
+            here. So I moved the definition back from tc.h to here. */
+struct relax_type
+{
+  /* Forward reach. Signed number. > 0.  */
+  long rlx_forward;
+  /* Backward reach. Signed number. < 0.  */
+  long rlx_backward;
+
+  /* Bytes length of this address.  */
+  unsigned char rlx_length;
+
+  /* Next longer relax-state.  0 means there is no 'next' relax-state.  */
+  relax_substateT rlx_more;
+};
+
 typedef struct frag fragS;
 
 #ifdef BFD_ASSEMBLER
diff -ur binutils-2.15.old/gas/tc.h binutils-2.15/gas/tc.h
--- binutils-2.15.old/gas/tc.h	2003-12-03 15:39:38.000000000 -0800
+++ binutils-2.15/gas/tc.h	2006-02-14 22:03:35.000000000 -0800
@@ -24,23 +24,6 @@
 
 extern const pseudo_typeS md_pseudo_table[];
 
-/* JF moved this here from as.h under the theory that nobody except MACHINE.c
-   and write.c care about it anyway.  */
-
-struct relax_type
-{
-  /* Forward reach. Signed number. > 0.  */
-  long rlx_forward;
-  /* Backward reach. Signed number. < 0.  */
-  long rlx_backward;
-
-  /* Bytes length of this address.  */
-  unsigned char rlx_length;
-
-  /* Next longer relax-state.  0 means there is no 'next' relax-state.  */
-  relax_substateT rlx_more;
-};
-
 typedef struct relax_type relax_typeS;
 
 extern const int md_reloc_size;	/* Size of a relocation record */