include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0
From: kernel test robot
Date: Wed Dec 31 2025 - 21:34:26 EST
Hi Paul,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b
commit: aca95fb6bb572a77f39d42d83ab72a965026577d powerpc/microwatt: Add SMP support
date: 10 months ago
config: powerpc64-randconfig-r113-20251231 (https://download.01.org/0day-ci/archive/20260101/202601011003.bwpVuFs1-lkp@xxxxxxxxx/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project f43d6834093b19baf79beda8c0337ab020ac5f17)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260101/202601011003.bwpVuFs1-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601011003.bwpVuFs1-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
In file included from <built-in>:3:
In file included from include/linux/compiler_types.h:171:
include/linux/compiler-clang.h:28:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
28 | #define __SANITIZE_ADDRESS__
| ^
<built-in>:354:9: note: previous definition is here
354 | #define __SANITIZE_ADDRESS__ 1
| ^
In file included from arch/powerpc/math-emu/math.c:14:
>> include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
59 | #if __BYTE_ORDER == __BIG_ENDIAN
| ^
2 warnings generated.
--
In file included from <built-in>:3:
In file included from include/linux/compiler_types.h:171:
include/linux/compiler-clang.h:28:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined]
28 | #define __SANITIZE_ADDRESS__
| ^
<built-in>:354:9: note: previous definition is here
354 | #define __SANITIZE_ADDRESS__ 1
| ^
In file included from arch/powerpc/math-emu/fsqrts.c:8:
>> include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
59 | #if __BYTE_ORDER == __BIG_ENDIAN
| ^
In file included from arch/powerpc/math-emu/fsqrts.c:9:
>> include/math-emu/single.h:50:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
50 | #if __BYTE_ORDER == __BIG_ENDIAN
| ^
3 warnings generated.
vim +/__BIG_ENDIAN +59 include/math-emu/double.h
^1da177e4c3f415 Linus Torvalds 2005-04-16 54
^1da177e4c3f415 Linus Torvalds 2005-04-16 55 union _FP_UNION_D
^1da177e4c3f415 Linus Torvalds 2005-04-16 56 {
^1da177e4c3f415 Linus Torvalds 2005-04-16 57 double flt;
^1da177e4c3f415 Linus Torvalds 2005-04-16 58 struct {
^1da177e4c3f415 Linus Torvalds 2005-04-16 @59 #if __BYTE_ORDER == __BIG_ENDIAN
^1da177e4c3f415 Linus Torvalds 2005-04-16 60 unsigned sign : 1;
^1da177e4c3f415 Linus Torvalds 2005-04-16 61 unsigned exp : _FP_EXPBITS_D;
^1da177e4c3f415 Linus Torvalds 2005-04-16 62 unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
^1da177e4c3f415 Linus Torvalds 2005-04-16 63 unsigned frac0 : _FP_W_TYPE_SIZE;
^1da177e4c3f415 Linus Torvalds 2005-04-16 64 #else
^1da177e4c3f415 Linus Torvalds 2005-04-16 65 unsigned frac0 : _FP_W_TYPE_SIZE;
^1da177e4c3f415 Linus Torvalds 2005-04-16 66 unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
^1da177e4c3f415 Linus Torvalds 2005-04-16 67 unsigned exp : _FP_EXPBITS_D;
^1da177e4c3f415 Linus Torvalds 2005-04-16 68 unsigned sign : 1;
^1da177e4c3f415 Linus Torvalds 2005-04-16 69 #endif
^1da177e4c3f415 Linus Torvalds 2005-04-16 70 } bits __attribute__((packed));
^1da177e4c3f415 Linus Torvalds 2005-04-16 71 };
^1da177e4c3f415 Linus Torvalds 2005-04-16 72
:::::: The code at line 59 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2
:::::: TO: Linus Torvalds <torvalds@xxxxxxxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxx>
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