[LLVMbugs] [Bug 21613] New: Clang MIPS: invalid input constraint '0' in asm

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21613

            Bug ID: 21613
           Summary: Clang MIPS: invalid input constraint '0' in asm
           Product: clang
           Version: 3.5
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: npennequ at cisco.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When compiling a file that includes linux_syscall_support.h[1] for MIPS
(-target mipsel-linux-uclibc -march=mips32), the following errors occur:

./linux_syscall_support.h:2977:14: error: invalid input constraint '0' in asm
  LSS_INLINE _syscall1(void *,  brk,             void *,      e)
             ^
./linux_syscall_support.h:2596:27: note: expanded from macro '_syscall1'
        LSS_REG(4, arg1); LSS_BODY(type, name, "=r", "r"(__r4));              \
                          ^
./linux_syscall_support.h:2583:35: note: expanded from macro 'LSS_BODY'
                                : "0"(__v0), ##__VA_ARGS__                    \
                                  ^
./linux_syscall_support.h:2978:14: error: invalid input constraint '0' in asm
  LSS_INLINE _syscall1(int,     chdir,           const char *,p)
             ^
./linux_syscall_support.h:2596:27: note: expanded from macro '_syscall1'
        LSS_REG(4, arg1); LSS_BODY(type, name, "=r", "r"(__r4));              \
                          ^
./linux_syscall_support.h:2583:35: note: expanded from macro 'LSS_BODY'
                                : "0"(__v0), ##__VA_ARGS__                    \
                                  ^

(many more of the same follow)

The same code compiles without error using mipsel-linux-uclibc-gcc 4.5.3 and
4.8.3.

$ clang --version
clang version 3.5.0 (trunk 214024)
Target: x86_64-unknown-linux-gnu
Thread model: posix

[1]
https://code.google.com/p/linux-syscall-support/source/browse/trunk/lss/linux_syscall_support.h

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