New target macro DECLARE_LIBRARY_RENAMES

From-SVN: r55889

gcc/ChangeLog

@@ -25,7 +25,10 @@
 	Bail out early if false_expr is NULL and we'd crash due to this.
 	* genemit.c (gen_expand): Recognize return insns even if the return
 	appears in a parallel.
-
+	* libgcc2.c: Expand macro DECLARE_LIBRARY_RENAMES if it is defined.
+	* config/fp-bit.c: Likewise.
+	* doc/tm.texi: Document it.
+			
 2002-07-30  David Edelsohn  <edelsohn@gnu.org>
 	    Zack Weinberg  <zack@codesourcery.com>
 

gcc/config/fp-bit.c

@@ -74,6 +74,10 @@ Boston, MA 02111-1307, USA.  */
    are referenced from within libc, since libgcc goes before and after the
    system library.  */
 
+#ifdef DECLARE_LIBRARY_RENAMES
+  DECLARE_LIBRARY_RENAMES
+#endif
+
 #ifdef EXTENDED_FLOAT_STUBS
 __truncxfsf2 (){ abort(); }
 __extendsfxf2 (){ abort(); }

gcc/doc/tm.texi

@@ -4598,6 +4598,13 @@ remainder in division of one unsigned full-word by another.  If you do
 not define this macro, the default name is used, which is
 @code{__umoddi3}, a function defined in @file{libgcc.a}.
 
+@findex DECLARE_LIBRARY_RENAMES
+@item DECLARE_LIBRARY_RENAMES
+This macro, if defined, should expand to a piece of C code that will get
+expanded when compiling functions for libgcc.a.  It can be used to
+provide alternate names for gcc's internal library functions if there
+are ABI-mandated names that the compiler should provide.
+
 @findex INIT_TARGET_OPTABS
 @item INIT_TARGET_OPTABS
 Define this macro as a C statement that declares additional library

gcc/libgcc2.c

@@ -43,6 +43,10 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 
 #include "libgcc2.h"
 
+#ifdef DECLARE_LIBRARY_RENAMES
+  DECLARE_LIBRARY_RENAMES
+#endif
+
 #if defined (L_negdi2)
 DWtype
 __negdi2 (DWtype u)