From 1b4d42ca2e97061042ec44a0b34ceb176c78c7e1 Mon Sep 17 00:00:00 2001
From: d-winsor <danwin@microsoft.com>
Date: Mon, 26 Feb 2024 13:17:12 -0800
Subject: [PATCH] Fix initialization in test (#1140)

* Suppress unsafe-buffer-usage

Upstream-Status: Backport [https://github.com/microsoft/GSL/commit/1b4d42ca2e97061042ec44a0b34ceb176c78c7e1]

Signed-off-by: Peter Marko <peter.marko@siemens.com>
---
 include/gsl/span     | 10 ++++++++++
 include/gsl/util     | 10 ++++++++++
 tests/CMakeLists.txt | 10 ++++++++++
 tests/span_tests.cpp |  2 +-
 4 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/include/gsl/span b/include/gsl/span
index cc8a7b9..d254e4d 100644
--- a/include/gsl/span
+++ b/include/gsl/span
@@ -58,6 +58,12 @@
 #pragma GCC diagnostic ignored "-Wsign-conversion"
 #endif
 
+// Turn off clang unsafe buffer warnings as all accessed are guarded by runtime checks
+#if defined(__clang__) && __has_warning("-Wunsafe-buffer-usage")
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
+#endif // defined(__clang__) && __has_warning("-Wunsafe-buffer-usage")
+
 namespace gsl
 {
 
@@ -818,4 +824,8 @@ as_writable_bytes(span<ElementType, Extent> s) noexcept
 #pragma GCC diagnostic pop
 #endif // __GNUC__ > 6
 
+#if defined(__clang__) && __has_warning("-Wunsafe-buffer-usage")
+#pragma clang diagnostic pop
+#endif
+
 #endif // GSL_SPAN_H
diff --git a/include/gsl/util b/include/gsl/util
index a215bad..11735a8 100644
--- a/include/gsl/util
+++ b/include/gsl/util
@@ -39,6 +39,12 @@
 
 #endif // _MSC_VER
 
+// Turn off clang unsafe buffer warnings as all accessed are guarded by runtime checks
+#if defined(__clang__) && __has_warning("-Wunsafe-buffer-usage")
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
+#endif // defined(__clang__) && __has_warning("-Wunsafe-buffer-usage")
+
 #if defined(__cplusplus) && (__cplusplus >= 201703L)
 #define GSL_NODISCARD [[nodiscard]]
 #else
@@ -157,4 +163,8 @@ constexpr auto at(std::span<T, extent> sp, const index i) -> decltype(sp[sp.size
 
 #endif // _MSC_VER
 
+#if defined(__clang__) && __has_warning("-Wunsafe-buffer-usage")
+#pragma clang diagnostic pop
+#endif
+
 #endif // GSL_UTIL_H
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index cab4e56..20de9e1 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -167,6 +167,11 @@ else()
         >
     )
 endif(MSVC)
+check_cxx_compiler_flag("-Wno-unsafe-buffer-usage" WARN_UNSAFE_BUFFER)
+if (WARN_UNSAFE_BUFFER)
+  # This test uses very greedy heuristics such as "no pointer arithmetic on raw buffer"
+  target_compile_options(gsl_tests_config INTERFACE "-Wno-unsafe-buffer-usage")
+endif()
 
 # for tests to find the gtest header
 target_include_directories(gsl_tests_config SYSTEM INTERFACE
@@ -267,6 +272,11 @@ else()
         >
     )
 endif(MSVC)
+check_cxx_compiler_flag("-Wno-unsafe-buffer-usage" WARN_UNSAFE_BUFFER)
+if (WARN_UNSAFE_BUFFER)
+  # This test uses very greedy heuristics such as "no pointer arithmetic on raw buffer"
+  target_compile_options(gsl_tests_config_noexcept INTERFACE "-Wno-unsafe-buffer-usage")
+endif()
 
 add_executable(gsl_noexcept_tests no_exception_ensure_tests.cpp)
 target_link_libraries(gsl_noexcept_tests
diff --git a/tests/span_tests.cpp b/tests/span_tests.cpp
index 33ccf56..3c1dfe5 100644
--- a/tests/span_tests.cpp
+++ b/tests/span_tests.cpp
@@ -330,7 +330,7 @@ TEST(span_test, from_array_constructor)
         EXPECT_TRUE(s.data() == std::addressof(arr2d[0]));
     }
 
-    int arr3d[2][3][2] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
+    int arr3d[2][3][2] = { { {1, 2}, {3, 4}, {5, 6} }, { {7, 8}, {9, 10}, {11, 12} } };
 
 #ifdef CONFIRM_COMPILATION_ERRORS
     {
-- 
2.30.2