Hi Anton,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   306a63bee192859ebd32c7328c7766636d882d8f
commit: 238abecde8ad43f914e095fcf23e0bd35dc7a7f2 powerpc: Don't use gcc specific options on clang
date:   10 months ago
config: powerpc-powernv_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 238abecde8ad43f914e095fcf23e0bd35dc7a7f2
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso32/sigtramp.o: compiled for a little endian system and target is big endian
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso32/sigtramp.o
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso32/gettimeofday.o: compiled for a little endian system and target is big endian
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso32/gettimeofday.o
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso32/datapage.o: compiled for a little endian system and target is big endian
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso32/datapage.o
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso32/cacheflush.o: compiled for a little endian system and target is big endian
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso32/cacheflush.o
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso32/note.o: compiled for a little endian system and target is big endian
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso32/note.o
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso32/getcpu.o: compiled for a little endian system and target is big endian
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso32/getcpu.o
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[0] FDE at 00000000000004c4 overlaps table[1] FDE at 0000000000000c30.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[1] FDE at 0000000000000c30 overlaps table[2] FDE at 0000000000000c88.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[2] FDE at 0000000000000c88 overlaps table[3] FDE at 0000000000000ca0.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[3] FDE at 0000000000000ca0 overlaps table[4] FDE at 0000000000000cb8.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[4] FDE at 0000000000000cb8 overlaps table[5] FDE at 0000000000000cd0.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[5] FDE at 0000000000000cd0 overlaps table[6] FDE at 0000000000000864.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[7] FDE at 0000000000000c48 overlaps table[8] FDE at 0000000000000c5c.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[8] FDE at 0000000000000c5c overlaps table[9] FDE at 0000000000000c18.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[9] FDE at 0000000000000c18 overlaps table[10] FDE at 0000000000000c74.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[10] FDE at 0000000000000c74 overlaps table[11] FDE at 0000000000000ce8.
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: .eh_frame_hdr table[11] FDE at 0000000000000ce8 overlaps table[12] FDE at 0000000000000cfc.
>> collect2: error: ld returned 1 exit status
--
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: arch/powerpc/kernel/vdso64/sigtramp.o: file class ELFCLASS64 incompatible with ELFCLASS32
   /usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: final link failed: File in wrong format
>> collect2: error: ld returned 1 exit status

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