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Fix: Under Clang compilation constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression #9049

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Fix: Under Clang compilation constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression #9049

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70aa27e
Fix: The compiler does not consider "#define INVALID_HANDLE_VALUE ((H…
Khalyutin Jun 2, 2026
ff81379
Add comment about "constexpr" not applicable in case
Khalyutin Jun 4, 2026
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10 changes: 9 additions & 1 deletion src/common/ThreadStart.h
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,15 @@ class Thread
public:
#ifdef WIN_NT
typedef HANDLE Handle;
constexpr static Handle INVALID_HANDLE = INVALID_HANDLE_VALUE;
/*
* "constexpr" not applicable for Handle INVALID_HANDLE = INVALID_HANDLE_VALUE
* because in Windows INVALID_HANDLE_VALUE define in handleapi.h as:
* "#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)"
* but C-cast & reinterpret_cast<>() are prohibited in constexpr.
* The Clang++ compiler does not consider it`s as a constant expression and raise compilation error:
* "constexpr variable 'INVALID_HANDLE' must be initialized by a constant expression"
*/
inline static const Handle INVALID_HANDLE = INVALID_HANDLE_VALUE;
#endif
#ifdef USE_POSIX_THREADS
typedef pthread_t Handle;
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