From 593f708118aef792f434185547f74fedeaf51dd4 Mon Sep 17 00:00:00 2001
From: Alexandre Ganea <aganea@havenstudios.com>
Date: Fri, 5 Jul 2024 20:44:25 -0400
Subject: [Support] Silence function cast warning when building with Clang ToT
 targetting Windows

---
 llvm/lib/Support/Windows/Process.inc | 9 +++++++++
 llvm/lib/Support/Windows/Signals.inc | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/llvm/lib/Support/Windows/Process.inc b/llvm/lib/Support/Windows/Process.inc
index 34d294b..b9110d4 100644
--- a/llvm/lib/Support/Windows/Process.inc
+++ b/llvm/lib/Support/Windows/Process.inc
@@ -482,9 +482,18 @@ static RTL_OSVERSIONINFOEXW GetWindowsVer() {
     HMODULE hMod = ::GetModuleHandleW(L"ntdll.dll");
     assert(hMod);
 
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wcast-function-type-mismatch"
+#endif
+
     auto getVer = (RtlGetVersionPtr)::GetProcAddress(hMod, "RtlGetVersion");
     assert(getVer);
 
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
     RTL_OSVERSIONINFOEXW info{};
     info.dwOSVersionInfoSize = sizeof(info);
     NTSTATUS r = getVer((PRTL_OSVERSIONINFOW)&info);
diff --git a/llvm/lib/Support/Windows/Signals.inc b/llvm/lib/Support/Windows/Signals.inc
index 29ebf7c..d057981 100644
--- a/llvm/lib/Support/Windows/Signals.inc
+++ b/llvm/lib/Support/Windows/Signals.inc
@@ -167,6 +167,11 @@ static bool isDebugHelpInitialized() {
   return fStackWalk64 && fSymInitialize && fSymSetOptions && fMiniDumpWriteDump;
 }
 
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wcast-function-type-mismatch"
+#endif
+
 static bool load64BitDebugHelp(void) {
   HMODULE hLib =
       ::LoadLibraryExA("Dbghelp.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
@@ -192,6 +197,10 @@ static bool load64BitDebugHelp(void) {
   return isDebugHelpInitialized();
 }
 
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
 using namespace llvm;
 
 // Forward declare.
-- 
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