Fix: Under Clang compilation constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression#9049
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…ANDLE)(LONG_PTR)-1)" as a constant - compilation error: constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression ``` [build] 77 | constexpr static Handle INVALID_HANDLE = INVALID_HANDLE_VALUE; [build] /code/src/remote\../remote\../common/ThreadStart.h:77:26: error: constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression [build] 77 | constexpr static Handle INVALID_HANDLE = INVALID_HANDLE_VALUE; [build] | ^ ~~~~~~~~~~~~~~~~~~~~ [build] /code/src/remote\../remote\../common/ThreadStart.h:77:43: note: cast that performs the conversions of a reinterpret_cast is not allowed in a constant expression [build] 77 | constexpr static Handle INVALID_HANDLE = INVALID_HANDLE_VALUE; [build] | ^ [build] C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\um\handleapi.h:27:31: note: expanded from macro 'INVALID_HANDLE_VALUE' [build] 27 | #define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1) [build] | ^ ```
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We're trying to solve the problem of compiling and building CMake+Clang without changing the approaches adopted in Firebird to avoid things complicating... |
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The compiler does not consider "#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)" as a constant - compilation error: constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression
In Windows 10.0.26100.0 INVALID_HANDLE_VALUE define C:\Program Files (x86)\Windows Kits\10\Include\10.0.26100.0\um\handleapi.h as
#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)
clang interpret "((HANDLE)(.." as reinterpret_cast operation and raise error:
No excepton in MSVS compiler. Clang has more hard control of a constant expression...