Richard Dzenis e6d305e64f Add support of Windows Trace Logging macros ...

Consider the following code:

    #include <windows.h>
    #include <TraceLoggingActivity.h>
    #include <TraceLoggingProvider.h>
    #include <winmeta.h>

    TRACELOGGING_DEFINE_PROVIDER(
        g_hMyComponentProvider,
        "SimpleTraceLoggingProvider",
        // {0205c616-cf97-5c11-9756-56a2cee02ca7}
        (0x0205c616,0xcf97,0x5c11,0x97,0x56,0x56,0xa2,0xce,0xe0,0x2c,0xa7));

    void test()
    {
        TraceLoggingFunction(g_hMyComponentProvider);
    }

    int main()
    {
        TraceLoggingRegister(g_hMyComponentProvider);
        test();
        TraceLoggingUnregister(g_hMyComponentProvider);
    }

It compiles with MSVC, but clang-cl reports an error:

    C:\Program Files (x86)\Windows Kits\10\\include\10.0.22621.0\\shared/TraceLoggingActivity.h(377,30): note: expanded from macro '_tlgThisFunctionName'
    #define _tlgThisFunctionName __FUNCTION__
                                 ^
    .\tl.cpp(14,5): error: cannot initialize an array element of type 'char' with an lvalue of type 'const char[5]'
        TraceLoggingFunction(g_hMyComponentProvider);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The second commit is not needed to support above code, however, during isolated tests in ms_predefined_expr.cpp
I found that MSVC accepts code with constexpr, whereas clang-cl does not.
I see that in most places PredefinedExpr is supported in constant evaluation, so I didn't wrap my code with ``if(MicrosoftExt)``.

Reviewed By: cor3ntin

Differential Revision: https://reviews.llvm.org/D158591

2023-09-04 16:54:42 +02:00

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