[llvm-bugs] [Bug 39361] New: Overload resolution depends on declaration order with -fms-compatibility

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39361

            Bug ID: 39361
           Summary: Overload resolution depends on declaration order with
                    -fms-compatibility
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Keywords: accepts-invalid, compile-fail, miscompilation
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hstong at ca.ibm.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Overload resolution with -fms-compatibility seems to be dependent on the order
of declarations. The overload sets f and g are parallels of each other, but
parallel calls do not resolve the same.

### SOURCE (<stdin>):
char *f(float, int);
template <typename T> int f(long, T);
template <typename T> int g(long, T);
char *g(float, int);

bool zip(int x) { return f(x, x) == g(x, x); }


### COMPILER INVOCATION COMMAND:
clang++ -cc1 -triple i386-unknown-linux-gnu -fsyntax-only -x c++ -std=c++03
-fms-compatibility -


### ACTUAL COMPILER OUTPUT:
<stdin>:6:34: error: comparison between pointer and integer ('char *' and
'int')
bool zip(int x) { return f(x, x) == g(x, x); }
                         ~~~~~~~ ^  ~~~~~~~
1 error generated.


### EXPECTED COMPILER OUTPUT:
(Clean compile).


### COMPILER VERSION INFO (clang++ -v):
clang version 8.0.0 (https://github.com/llvm-mirror/clang.git
2abe10f0902311fdb2896d3c6223787f51049fac)
(https://github.com/llvm-mirror/llvm.git
4aeb7d033aef4e4345e52330160ea21ade905859)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Selected multilib: .;@m64

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