[llvm-bugs] [Bug 39881] New: [Windows] __uuidof in a template parameter issue with MSVC abi

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39881

            Bug ID: 39881
           Summary: [Windows] __uuidof in a template parameter issue with
                    MSVC abi
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mike.winterberg at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Between r345380 and r346630 (likely, in r345692), in C++17 mode passing
__uuidof(X) to a template parameter started failing with the error "cannot yet
mangle expression type ConstantExpr" if the target is i386-pc-windows or
amd64-pc-windows.

Compiling this code:
typedef struct _GUID
{
    unsigned long  Data1;
    unsigned short Data2;
    unsigned short Data3;
    unsigned char  Data4[8];
} GUID;
struct __declspec(uuid("12345678-1234-1234-1234-123456789abc")) uuid;

template <const _GUID*>
struct baz {
};
baz<&__uuidof(uuid)> y;

as -std=c++17 -fms-extensions -target amd64-pc-windows results in this error:
uuidof.cc:12:5: error: cannot yet mangle expression type ConstantExpr

CE link just to show the effect of different flags:
https://gcc.godbolt.org/z/PXV4rO

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