[llvm-bugs] [Bug 31585] New: clang does not allow Microsoft's __FUNCTION__, __FUNCSIG__, and __FUNCDNAME predefined macros in conditional preprocessing directives

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31585

            Bug ID: 31585
           Summary: clang does not allow Microsoft's __FUNCTION__,
                    __FUNCSIG__, and __FUNCDNAME predefined macros in
                    conditional preprocessing directives
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: thonerma at synopsys.com
                CC: llvm-bugs at lists.llvm.org,
                    sig-rnd-sat-clang-bugs at synopsys.com
    Classification: Unclassified

Microsoft's compiler allows the __FUNCTION__, __FUNCSIG__, and __FUNCDNAME
predefined macros to appear in conditional preprocessing directives as defined
macros:

$ cat t.cpp
#if !defined(__FUNCTION__)
#error __FUNCTION__ is not defined.
#endif
#if !defined(__FUNCSIG__)
#error __FUNCSIG__ is not defined.
#endif
#if !defined(__FUNCDNAME__)
#error __FUNCDNAME__ is not defined.
#endif

$ cl /c t.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24215.1 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

t.cpp
<no errors>

$ clang --version
clang version 3.9.0 (tags/RELEASE_390/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
...

$ clang -c -fms-extensions t.cpp
t.cpp:2:2: error: __FUNCTION__ is not defined.
#error __FUNCTION__ is not defined.
 ^
t.cpp:5:2: error: __FUNCSIG__ is not defined.
#error __FUNCSIG__ is not defined.
 ^
t.cpp:8:2: error: __FUNCDNAME__ is not defined.
#error __FUNCDNAME__ is not defined.
 ^
3 errors generated.

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