tech-toolchain archive
[
Date Prev][
Date Next][
Thread Prev][
Thread Next][
Date Index][
Thread Index][
Old Index]
re: Building a soft-float target compiler
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.
this patch would be rejected upstream but there's no actual
facility for this currently that i can see.
i thought some combination of --with-cpu= or other hacks
would help but turns out they don't. the only way i can
see to turn off soft-float by default is to choose a
cpu that does not include soft-float, and that is not
what you are after.
i'm not sure what the right answer would be. gcc folks?
.mrg.
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}
Home |
Main Index |
Thread Index |
Old Index