[libcxx] Add cast to avoid pointer casting warning on Windows #92738
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@llvm/pr-subscribers-libcxx Author: Martin Storsjö (mstorsjo) ChangesThis avoids the following build time warning, when building with the latest nightly Clang: This warning seems to have appeared since Clang commit 999d4f8, which restructured. The GetProcAddress function returns a Full diff: https://github.com/llvm/llvm-project/pull/92738.diff 1 Files Affected:
diff --git a/libcxx/src/chrono.cpp b/libcxx/src/chrono.cpp
index e7d6dfbc22924..009c210993ce8 100644
--- a/libcxx/src/chrono.cpp
+++ b/libcxx/src/chrono.cpp
@@ -77,8 +77,8 @@ typedef void(WINAPI* GetSystemTimeAsFileTimePtr)(LPFILETIME);
class GetSystemTimeInit {
public:
GetSystemTimeInit() {
- fp =
- (GetSystemTimeAsFileTimePtr)GetProcAddress(GetModuleHandleW(L"kernel32.dll"), "GetSystemTimePreciseAsFileTime");
+ fp = (GetSystemTimeAsFileTimePtr)(void *)GetProcAddress(
+ GetModuleHandleW(L"kernel32.dll"), "GetSystemTimePreciseAsFileTime");
if (fp == nullptr)
fp = GetSystemTimeAsFileTime;
}
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✅ With the latest revision this PR passed the C/C++ code formatter. |
This avoids the following build time warning, when building with
the latest nightly Clang:
warning: cast from 'FARPROC' (aka 'int (*)() __attribute__((stdcall))') to
'GetSystemTimeAsFileTimePtr' (aka 'void (*)(_FILETIME *) __attribute__((stdcall))')
converts to incompatible function type [-Wcast-function-type-mismatch]
This warning seems to have appeared since Clang commit
999d4f8, which restructured.
The GetProcAddress function returns a FARPROC type, which is
"int (WINAPI *)()". Directly casting this to another function pointer
type triggers this warning, but casting to a void* inbetween
avoids this issue. (On Unix-like platforms, dlsym returns a
"void*", which doesn't exhibit this casting problem.)
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This avoids the following build time warning, when building with the latest nightly Clang:
This warning seems to have appeared since Clang commit 999d4f8, which restructured.
The GetProcAddress function returns a
FARPROCtype, which isint (WINAPI *)(). Directly casting this to another function pointer type triggers this warning, but casting to avoid*inbetween avoids this issue. (On Unix-like platforms, dlsym returns avoid*, which doesn't exhibit this casting problem.)