[SeaBIOS] Build errors with Clang 3.2: src/ioport.h:126:18: error: invalid operand for instruction

[Paul Menzel]

Dear SeaBIOS folks,

using Debian Sid/unstable and Clang 3.2 from Debian experimental

$ clang --version
        Debian clang version 3.2-1~exp6 (tags/RELEASE_32/final) (based on LLVM 3.2)
        Target: i386-pc-linux-gnu
        Thread model: posix

to build SeaBIOS, Clang throws the following errors.

$ git show
        commit f465e1ec1b01826100c92b890487a2ab09bfe2c1
        Author: Kevin O'Connor 
        Date:   Sat Feb 23 21:33:36 2013 -0500

Minor - introduce numeric defines for the IVT offset of hw irqs.
        $ make menuconfig # coreboot chosen, see attached
        $ CC=clang make
        […]
        In file included from src/ata.c:9:
        src/ioport.h:126:18: error: invalid operand for instruction
            asm volatile("rep outsw %%es:(%%esi), (%%dx)"
                         ^
        <inline asm>:1:12: note: instantiated into assembly here
                rep outsw %es:(%esi), (%dx)
                          ^~~~~~~~~~
        In file included from src/ata.c:9:
        src/ioport.h:113:18: error: invalid operand for instruction
            asm volatile("rep insw (%%dx), %%es:(%%edi)"
                         ^
        <inline asm>:1:11: note: instantiated into assembly here
                rep insw (%dx), %es:(%edi)
                         ^~~~~
        2 errors generated.
        make: *** [out/ata.o] Fehler 1

I have no clue about assembler programming, so before reporting both
errors to the Clang project, as it works with GCC, I want to make sure
that Clang is mistaken here.

Thanks,

Paul