[LLVMbugs] [Bug 22515] New: Build fails for arm-none-eabi target

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22515

            Bug ID: 22515
           Summary: Build fails for arm-none-eabi target
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: trlim at iotok.kr
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I'm trying to build rust cross compiler for arm-none-eabi target on Windows.
But while attempting to build compiler-rt, it fails with following message.

C:/workspace/rust/src/compiler-rt/lib/builtins/int_endianness.h:108:2: error:
#error Unable to determine endian

It is simply because the header cannot determine target endianness for
arm-none-eabi.

Because I'm using gcc 4.8.4 for target compiler, my temporary workaround for
this is to check __BYTE_ORDER__ predefined macro.

...
#if defined(__BYTE_ORDER__)

#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define _YUGA_LITTLE_ENDIAN 0
#define _YUGA_BIG_ENDIAN    1
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define _YUGA_LITTLE_ENDIAN 1
#define _YUGA_BIG_ENDIAN    0
#endif /* __BYTE_ORDER__ */

#endif /* GCC/clang with __BYTE_ORDER__ predefined */
...

But I don't know if it is a good idea to change source code every time we add
support to a new target/compiler.

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