Building a soft-float target compiler

[Simon Burge <simonb%NetBSD.org@localhost>]

Hi folks,

At $WORK we've been using the following patch to generate a compiler for
PowerPC 405 that builds soft-float by default.  This has been especially
useful so you don't need to edit makefiles with pkgsrc between a "make
configure" and a "make install" to manually add -msoft-float everywhere.

To enable this, use

        ./build.sh ... -V MKSOFTFLOAT_TARGET_TOOLCHAIN=yes ...

The MK option name is a bit unwieldy, but other than that, anyone see
any problems with adding this patch?  I couldn't see any other easy way
to get this functionality.

Cheers,
Simon.
--
Index: gnu/dist/gcc4/gcc/config/rs6000/rs6000.c
===================================================================
RCS file: /cvsroot/src/gnu/dist/gcc4/gcc/config/rs6000/rs6000.c,v
retrieving revision 1.7
diff -d -p -u -r1.7 rs6000.c
--- gnu/dist/gcc4/gcc/config/rs6000/rs6000.c    11 Jan 2007 06:59:53 -0000      
1.7
+++ gnu/dist/gcc4/gcc/config/rs6000/rs6000.c    22 Jan 2008 14:33:49 -0000
@@ -1212,6 +1212,10 @@ rs6000_override_options (const char *def
   rs6000_select[0].string = default_cpu;
   rs6000_cpu = TARGET_POWERPC64 ? PROCESSOR_DEFAULT64 : PROCESSOR_DEFAULT;
 
+#ifdef TARGET_TOOLCHAIN_IS_SOFTFLOAT
+  target_flags |= MASK_SOFT_FLOAT;
+#endif
+
   for (i = 0; i < ARRAY_SIZE (rs6000_select); i++)
     {
       ptr = &rs6000_select[i];
Index: gnu/usr.bin/gcc4/backend/Makefile
===================================================================
RCS file: /cvsroot/src/gnu/usr.bin/gcc4/backend/Makefile,v
retrieving revision 1.9
diff -d -p -u -r1.9 Makefile
--- gnu/usr.bin/gcc4/backend/Makefile   8 Apr 2007 09:35:32 -0000       1.9
+++ gnu/usr.bin/gcc4/backend/Makefile   22 Jan 2008 14:33:49 -0000
@@ -50,6 +50,9 @@ CPPFLAGS.${f}.c=              -DGENERATOR_FILE
 # XXX
 COPTS.varasm.c=                        -Wno-error
 
+.if (${MKSOFTFLOAT_TARGET_TOOLCHAIN:Uno} == "yes")
+CPPFLAGS+= -DTARGET_TOOLCHAIN_IS_SOFTFLOAT
+.endif
 
 # Headers that host objects depend on (except gen*rtl*)
 HH_NORTL=      ${G_tm_file_list} ${G_build_xm_include_list}