On Thu, 2015-06-18 at 15:52 +0100, Andre Przywara wrote:
> Hi,
>
> On 06/17/2015 10:43 AM, Andre Przywara wrote:
> > For converting the guest/init binary into an object file, we call
> > the linker binary, setting the endianness to big endian explicitly
> > when compiling kvmtool for powerpc.
> > This breaks if the compiler is actually targetting little endian
> > (which is true for the Debian port, for instance).
> > Remove the explicit big endianness switch from the linker call to
> > allow linking on little endian PowerPC builds again.
> >
> > Signed-off-by: Andre Przywara <[email protected]>
> > ---
> > Hi,
> >
> > this fixed the powerpc64le build for me, while still compiling fine
> > for big endian. Admittedly this whole init->guest_init.o conversion
> > has its issues (with MIPS, for instance), which deserve proper fixing,
> > but lets just fix that build for now.
>
> Will was concerned about breaking toolchains where the linker does not
> default to 64-bit. Is that an issue we care about?
Yeah, that would be Debian & Ubuntu BE at least, and maybe Fedora too? I'm not
sure how you compiled it big endian?
> AFAICT LDFLAGS is only used in this dodgy binary-to-object-file
> conversion of guest/init. For this we rely on the resulting .o file to
> have the same ELF target as the other object files to be finally linked
> into the lkvm binary. As we don't compile guest/init with CFLAGS, there
> is a possible mismatch.
>
> I am looking into a proper fix for this now (compiling guest/init with
> CFLAGS, calling $CC with linker options instead of $LD and allowing CC
> and LD override). Still struggling with MIPS, though :-(
Yeah that's obviously a better solution medium term.
Can you do something like this? Sorry untested:
diff --git a/Makefile b/Makefile
index 6110b8e..8663d67 100644
--- a/Makefile
+++ b/Makefile
@@ -149,7 +149,11 @@ ifeq ($(ARCH), powerpc)
OBJS += powerpc/xics.o
ARCH_INCLUDE := powerpc/include
CFLAGS += -m64
- LDFLAGS += -m elf64ppc
+ ifeq ($(call try-build,$(SOURCE_HELLO),$(CFLAGS),-m elf64ppc),y)
+ LDFLAGS += -m elf64ppc
+ else
+ LDFLAGS += -m elf64leppc
+ endif
ARCH_WANT_LIBFDT := y
endif
cheers
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