allwpilib/upstream_utils/llvm_patches/0008-Add-compiler-warning-pragmas.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: PJ Reiniger <pj.reiniger@gmail.com>
Date: Sun, 8 May 2022 13:34:07 -0400
Subject: [PATCH 08/33] Add compiler warning pragmas

---
 llvm/include/llvm/ADT/FunctionExtras.h    | 11 +++++++++++
 llvm/include/llvm/ADT/SmallVector.h       |  9 +++++++++
 llvm/include/llvm/Support/MathExtras.h    |  9 +++++++++
 llvm/include/llvm/Support/MemAlloc.h      | 13 +++++++++++++
 llvm/lib/Support/raw_ostream.cpp          |  4 ++++
 llvm/unittests/ADT/DenseMapTest.cpp       |  4 ++++
 llvm/unittests/ADT/FunctionExtrasTest.cpp |  6 ++++++
 llvm/unittests/ADT/SmallVectorTest.cpp    |  4 ++++
 llvm/unittests/Support/AlignOfTest.cpp    |  7 +++----
 9 files changed, 63 insertions(+), 4 deletions(-)

diff --git a/llvm/include/llvm/ADT/FunctionExtras.h b/llvm/include/llvm/ADT/FunctionExtras.h
index c4d0821076d63842927d2abeef4a5189cdf325e7..730822d37c62b992316c850021dc5edb8ff13c36 100644
--- a/llvm/include/llvm/ADT/FunctionExtras.h
+++ b/llvm/include/llvm/ADT/FunctionExtras.h
@@ -55,6 +55,13 @@ namespace llvm {
 ///   It can hold functions with a non-const operator(), like mutable lambdas.
 template <typename FunctionT> class unique_function;
 
+// GCC warns on OutOfLineStorage
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
 namespace detail {
 
 template <typename CallableT, typename ThisT>
@@ -391,6 +398,10 @@ public:
   }
 };
 
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
+
 } // end namespace llvm
 
 #endif // LLVM_ADT_FUNCTIONEXTRAS_H
diff --git a/llvm/include/llvm/ADT/SmallVector.h b/llvm/include/llvm/ADT/SmallVector.h
index e27d0d71ec6176ee8081660f9ed6ba6672d7828d..913be7105222efb45015485fc04c0ab984dbe638 100644
--- a/llvm/include/llvm/ADT/SmallVector.h
+++ b/llvm/include/llvm/ADT/SmallVector.h
@@ -16,6 +16,15 @@
 
 #include "llvm/ADT/ADL.h"
 #include "llvm/ADT/DenseMapInfo.h"
+
+// This file uses std::memcpy() to copy std::pair<unsigned int, unsigned int>.
+// That type is POD, but the standard doesn't guarantee that. GCC doesn't treat
+// the type as POD so it throws a warning. We want to consider this a warning
+// instead of an error.
+#if __GNUC__ >= 8
+#pragma GCC diagnostic warning "-Wclass-memaccess"
+#endif
+
 #include "llvm/Support/Compiler.h"
 #include <algorithm>
 #include <cassert>
diff --git a/llvm/include/llvm/Support/MathExtras.h b/llvm/include/llvm/Support/MathExtras.h
index 120a1641110aca97acf2ab9cd3806d94accbb8aa..78c500e18c7639afc02b595b788333b6b9a4e69b 100644
--- a/llvm/include/llvm/Support/MathExtras.h
+++ b/llvm/include/llvm/Support/MathExtras.h
@@ -219,6 +219,11 @@ inline constexpr uint64_t maxUIntN(uint64_t N) {
   return UINT64_MAX >> (64 - N);
 }
 
+#ifdef _WIN32
+#pragma warning(push)
+#pragma warning(disable : 4146)
+#endif
+
 /// Gets the minimum value for a N-bit signed integer.
 inline constexpr int64_t minIntN(int64_t N) {
   assert(N <= 64 && "integer width out of range");
@@ -228,6 +233,10 @@ inline constexpr int64_t minIntN(int64_t N) {
   return UINT64_MAX << (N - 1);
 }
 
+#ifdef _WIN32
+#pragma warning(pop)
+#endif
+
 /// Gets the maximum value for a N-bit signed integer.
 inline constexpr int64_t maxIntN(int64_t N) {
   assert(N <= 64 && "integer width out of range");
diff --git a/llvm/include/llvm/Support/MemAlloc.h b/llvm/include/llvm/Support/MemAlloc.h
index 3b086cb171806f3f216a9bac7de46a29da3c5481..9205299d1cc7ddc93d2d5781e744305679ff39c8 100644
--- a/llvm/include/llvm/Support/MemAlloc.h
+++ b/llvm/include/llvm/Support/MemAlloc.h
@@ -22,6 +22,14 @@
 
 namespace llvm {
 
+#ifdef _WIN32
+#pragma warning(push)
+// Warning on NONNULL, report is not known to abort
+#pragma warning(disable : 6387)
+#pragma warning(disable : 28196)
+#pragma warning(disable : 28183)
+#endif
+
 LLVM_ATTRIBUTE_RETURNS_NONNULL inline void *safe_malloc(size_t Sz) {
   void *Result = std::malloc(Sz);
   if (Result == nullptr) {
@@ -84,4 +92,9 @@ allocate_buffer(size_t Size, size_t Alignment);
 LLVM_ABI void deallocate_buffer(void *Ptr, size_t Size, size_t Alignment);
 
 } // namespace llvm
+
+#ifdef _WIN32
+#pragma warning(pop)
+#endif
+
 #endif
diff --git a/llvm/lib/Support/raw_ostream.cpp b/llvm/lib/Support/raw_ostream.cpp
index bf5d06018979474cf6166fed61be93eede0dece1..5496df7f6f83debb8b13bb9b828cdbddab91b07b 100644
--- a/llvm/lib/Support/raw_ostream.cpp
+++ b/llvm/lib/Support/raw_ostream.cpp
@@ -10,6 +10,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifdef _WIN32
+#define _CRT_NONSTDC_NO_WARNINGS
+#endif
+
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Config/config.h"
diff --git a/llvm/unittests/ADT/DenseMapTest.cpp b/llvm/unittests/ADT/DenseMapTest.cpp
index fffa07e1978bb3b8c2013073bdd58556d145ff23..1a81ecdd758ce285533fcb0565713f30a6cef33e 100644
--- a/llvm/unittests/ADT/DenseMapTest.cpp
+++ b/llvm/unittests/ADT/DenseMapTest.cpp
@@ -6,6 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
 #include "llvm/ADT/DenseMap.h"
 #include "CountCopyAndMove.h"
 #include "llvm/ADT/DenseMapInfo.h"
diff --git a/llvm/unittests/ADT/FunctionExtrasTest.cpp b/llvm/unittests/ADT/FunctionExtrasTest.cpp
index e92f5fcdfce0175eea843e81ef89604e0c2297f6..3a2008adb0697757c68af8ad462b9af716c456a6 100644
--- a/llvm/unittests/ADT/FunctionExtrasTest.cpp
+++ b/llvm/unittests/ADT/FunctionExtrasTest.cpp
@@ -329,6 +329,12 @@ TEST(UniqueFunctionTest, InlineStorageWorks) {
   UniqueFunctionWithInlineStorage(&UniqueFunctionWithInlineStorage);
 }
 
+
+// GCC warns that val in CountCopyAndMove is uninitialized
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wuninitialized"
+#endif
 // Check that the moved-from captured state is properly destroyed during
 // move construction/assignment.
 TEST(UniqueFunctionTest, MovedFromStateIsDestroyedCorrectly) {
diff --git a/llvm/unittests/ADT/SmallVectorTest.cpp b/llvm/unittests/ADT/SmallVectorTest.cpp
index f83bc116e4851f39fd6e496ee25ae1fb9acd96ca..5589671f7909d1994626c3f0ad043e64ef9768ab 100644
--- a/llvm/unittests/ADT/SmallVectorTest.cpp
+++ b/llvm/unittests/ADT/SmallVectorTest.cpp
@@ -18,6 +18,10 @@
 #include <span>
 #include <stdarg.h>
 
+#if defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wpedantic"
+#endif
+
 using namespace llvm;
 
 namespace {
diff --git a/llvm/unittests/Support/AlignOfTest.cpp b/llvm/unittests/Support/AlignOfTest.cpp
index 53358a2815daa4d6d55e01b4d286b962d3d947e5..d297da14525295fb5b6d60d2017de177cc48bcf7 100644
--- a/llvm/unittests/Support/AlignOfTest.cpp
+++ b/llvm/unittests/Support/AlignOfTest.cpp
@@ -31,10 +31,9 @@ namespace {
 #pragma clang diagnostic ignored "-Wunknown-pragmas"
 #pragma clang diagnostic ignored "-Winaccessible-base"
 #elif defined(__GNUC__)
-// Pragma based warning suppression was introduced in GGC 4.2.  Additionally
-// this warning is "enabled by default".  The warning still appears if -Wall is
-// suppressed.  Apparently GCC suppresses it when -w is specifed, which is odd.
-#pragma GCC diagnostic warning "-w"
+#pragma GCC diagnostic warning "-Wunknown-pragmas"
+#pragma GCC diagnostic warning "-Winaccessible-base"
+#pragma GCC diagnostic warning "-Wunused-function"
 #endif
 
 // Define some fixed alignment types to use in these tests.