[llvm-bugs] [Bug 27382] New: Another clang-cl preprocessor error in expansion where VC++ works

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27382

            Bug ID: 27382
           Summary: Another clang-cl preprocessor error in expansion where
                    VC++ works
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eldlistmailingz at tropicsoft.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

This bug report illustrates another clang-cl preprocessor error where VC++
compiles without any error, found when testing the Boost preprocessor library.
The code is a simplified version of the Boost PP problem when compiling with
clang-cl:

#define TEST_EXPAND(x) TEST_EXPAND_I(x)
#define TEST_EXPAND_I(x) x
#define TEST_REM(...) __VA_ARGS__

#define TEST_CAT(a, b) TEST_CAT_I(a, b)
#define TEST_CAT_I(a, b) a ## b

#define TEST_ELEM(n, ...) TEST_ELEM_I(n,__VA_ARGS__)
#define TEST_ELEM_I(n, ...) TEST_CAT(TEST_CAT(TEST_ELEM_, n)(__VA_ARGS__,),)
#define TEST_ELEM_0(e0, ...) e0
#define TEST_ELEM_1(e0, e1, ...) e1

#define TEST_MACRO(x,y) TEST_ELEM(x, TEST_EXPAND(TEST_REM y))

int main()
    {
    int x = TEST_MACRO(1,(1,0));
    return x;
    }

------------------------------------------------------------------------------

When compiled with clang-cl the result is:

test_clang2.cpp(17,29):  error: too many arguments provided to function-like
macro invocation
    int x = TEST_MACRO(1,(1,0));
                            ^
test_clang2.cpp(2,9):  note: macro 'TEST_EXPAND_I' defined here
#define TEST_EXPAND_I(x) x
        ^
test_clang2.cpp(17,32):  error: expected expression
    int x = TEST_MACRO(1,(1,0));

------------------------------------------------------------------------------

VC++ compiles the above without error.

The command line options for clang-cl are:

-TP /Od /Ob0 /W3 /GR /MDd  /Zc:forScope /Zc:wchar_t -fmsc-version=1900 /wd4675
/EHs -fmacro-backtrace-limit=0 -Wno-invalid-token-paste -c

The command line options for the successful VC++ compile are:

/Zm800 -TP /Z7 /Od /Ob0 /W4 /GR /MDd /Zc:forScope /Zc:wchar_t /wd4675 /EHs -c

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