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Suppress some noisy / buggy warnings (#1136)

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Two warnings were being emitted in the MSVC+LLVM tests. 

The warning `-Wunsafe-buffer-usage` is initially introduced in some capacity here https://reviews.llvm.org/D137346 pointing to documentation at https://discourse.llvm.org/t/rfc-c-buffer-hardening/65734. The warning is a stylistic checker whose goal is to "emit a warning every time an unsafe operation is performed on a raw pointer". This type of programming model is not useful for library implementations of types such as `span`, where direct manipulation of raw pointers is inevitable, so disable the warning altogether.

There is also a false-positive warning https://github.com/llvm/llvm-project/issues/65689 that I've disabled inline.
This commit is contained in:
Dmitry Kobets 2023-09-11 10:06:40 -07:00 committed by GitHub
parent 9695da9b38
commit 2940006b5c
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2 changed files with 19 additions and 2 deletions
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7
include/gsl/span
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@ -777,8 +777,15 @@ span(const Container&) -> span<Element>;
#endif // ( defined(__cpp_deduction_guides) && (__cpp_deduction_guides >= 201611L) ) #endif // ( defined(__cpp_deduction_guides) && (__cpp_deduction_guides >= 201611L) )
#if defined(GSL_USE_STATIC_CONSTEXPR_WORKAROUND) #if defined(GSL_USE_STATIC_CONSTEXPR_WORKAROUND)
#if defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated" // Bug in clang-cl.exe which raises a C++17 -Wdeprecated warning about this static constexpr workaround in C++14 mode.
#endif // defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
template <class ElementType, std::size_t Extent> template <class ElementType, std::size_t Extent>
constexpr const typename span<ElementType, Extent>::size_type span<ElementType, Extent>::extent; constexpr const typename span<ElementType, Extent>::size_type span<ElementType, Extent>::extent;
#if defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
#pragma clang diagnostic pop
#endif // defined(__clang__) && defined(_MSC_VER) && defined(__cplusplus) && (__cplusplus < 201703L)
#endif #endif
namespace details namespace details

10
tests/CMakeLists.txt
View File

@ -123,6 +123,11 @@ if(MSVC) # MSVC or simulating MSVC
if (WARN_RESERVED_ID) if (WARN_RESERVED_ID)
target_compile_options(gsl_tests_config INTERFACE "-Wno-reserved-identifier") target_compile_options(gsl_tests_config INTERFACE "-Wno-reserved-identifier")
endif() endif()
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()
else() else()
target_compile_options(gsl_tests_config INTERFACE target_compile_options(gsl_tests_config INTERFACE
-fno-strict-aliasing -fno-strict-aliasing
@ -257,6 +262,11 @@ if(MSVC) # MSVC or simulating MSVC
if (WARN_RESERVED_ID) if (WARN_RESERVED_ID)
target_compile_options(gsl_tests_config_noexcept INTERFACE "-Wno-reserved-identifier") target_compile_options(gsl_tests_config_noexcept INTERFACE "-Wno-reserved-identifier")
endif() endif()
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()
else() else()
target_compile_options(gsl_tests_config_noexcept INTERFACE target_compile_options(gsl_tests_config_noexcept INTERFACE
-fno-exceptions -fno-exceptions