Clang cl (#762)

* Added c++17 test configurations for clang5.0 and clang6.0 * Fix #739 correct cppcorecheck warnings for clang-cl * Add clang-cl configurations * Corrections Appveyor; Temporarily disable msvc compilation for faster testing (#741) * Add path to clang-cl.exe (#741) * Escape backslash in path (#741) * Update vcpkg (#741) * Check vcpkg version; try without building vcpkg; use latest clang-cl from path (#741) * Fix blocks in ps script (#741) * Try accessing APPVEYOR_BUILD_FOLDER variable (#471) * Update span size() bug confirmation test for GCC 6.5 (#741) * MSVC flags to Clang-cl; disable c++98-compat and undefined macro warnings (#741) * Suppress clang warning on tests (missing-prototypes) (#741) * Fix clang warning -Wnewline-eof (#741) * Fix clang warning -Wdouble-promotion (#741) * Set linker explicitly * Clean condition statement * For Clang, fallback to the AppVeyor installed version of CMake * Fix clang warning -Wmissing-variable-declarations * Fallback to the MSVC linker until vcpkg has been updated * Revert "Fallback to the MSVC linker until vcpkg has been updated" This reverts commit 7263f3289e. * Fix clang warning -Wunused-member-function * Fix clang warning -Wmissing-noreturn * Fix clang warning -Winvalid-noreturn on Windows * Add macro block end comment on large #if blocks * Workaround: fallback to mscv link.exe * Workaround: get msvc paths into PowerShell through intermediate file * Workaround: fix, remove "PATH=" from text * Workaround: try with full-path; and return user PATH * Workaround: fix, escape backslashes * Revert all since "Workaround: fallback to mscv link.exe" did not work on AppVeyor This reverts the commits: bda3d6a428 97062933ac 0f4fb04bac 1b0c19afd1 a5739ea5f0 * Suppress output of git pull; remove vcpkg from cache * Re-enable AppVeyor builds for all platforms * Correct typo Co-Authored-By: Farwaykorse <Farwaykorse@users.noreply.github.com> * Add Clang-cl 7.0.0 to the supported platforms * Revert "Fix clang warning -Wunused-member-function" This reverts commit 6fe1a42035. * Fix or locally suppress clang warning -Wunused-member-function * format touched code and correct comment * git pull --quiet * fix logic error in workaround * fix missing bracket * Suppress output of mkdir * Replace MSBuild with Ninja * Suppress output of 7z * Add architecture flags for Clang * Drop workaround for lld-link * 7-zip Overwrite and Alternative output suppression without suppressing errors Replaces 3c1c0794dd * AppVeyor setup and CMake before build * reorder compiler configuration * remove unnecessary * remove -fno-strict-aliasing * remove -Wsign-conversion, since before v4.0 part of -Wconversion * -Wctor-dtor-privacy is GCC only * remove -Woverloaded-virtual part of -Wmost, part of -Wall * add -Wmissing-noreturn * remove the pragmas for -Wunused-member-function * Re-add MSBuild generator on AppVeyor * Print CMake commands * Add MSBuild toolset selection * Separate Architecture setting * clang-cl: add -Weverything * clang-cl -Wno-c++98-compat * clang-cl -Wno-c++98-compat-pedantic * clang-cl -Wno-missing-prototypes * clang-cl C++14 -Wno-unused-member-function * clang-cl -Wundef __GNUC__ * clang++: add -Weverything * clang++ -Wno-c++98-compat * clang++ -Wno-c++98-compat-pedantic * clang++ -Wno-missing-prototypes * clang++ -Wno-weak-vtables * clang++ C++14 -Wno-unused-member-function * clang++ fix -Wundef _MSC_VER * clang++ -Wno-padded * clang++ solve -Wdeprecated * Add AppleClang compiler target Since CMake v3.0 use of Clang for both is deprecated * clang++ v5.0 C++17 -Wno-undefined-func-template * Add VS2015 + LLVM/clang-cl to AppVeyor * Do not disable constexpr when compiling with clang-cl on Windows * Clean-up clang-only warnings (now under -Weverything) * Revert "Fix clang warning -Winvalid-noreturn on Windows" This reverts commit 2238c4760e. * Suppress -Winvalid-noreturn for the MS STL noexception workaround * CMake: put preprocessor definition in target_compile_definitions * Solve compiler warning C4668: __GNUC__ not defined
2024-11-03 17:56:43 -05:00 · 2019-01-15 10:27:34 -08:00 · 2019-01-15 10:27:34 -08:00 · 6418b5f4de
commit 6418b5f4de
parent 6eeed739f1
17 changed files with 213 additions and 106 deletions
--- a/README.md
+++ b/README.md
@ -27,6 +27,7 @@ The test suite that exercises GSL has been built and passes successfully on the
 * Windows using Visual Studio 2015
 * Windows using Visual Studio 2017
 * Windows using Clang/LLVM 3.6
+* Windows using Clang/LLVM 7.0.0
 * Windows using GCC 5.1
 * Windows using Intel C++ Compiler 18.0
 * GNU/Linux using Clang/LLVM 3.6
--- a/appveyor.yml
+++ b/appveyor.yml
@ -13,44 +13,108 @@ image:
  - Visual Studio 2017

 environment:
+  NINJA_TAG: v1.8.2
+  NINJA_SHA512: 9B9CE248240665FCD6404B989F3B3C27ED9682838225E6DC9B67B551774F251E4FF8A207504F941E7C811E7A8BE1945E7BCB94472A335EF15E23A0200A32E6D5
+  NINJA_PATH: C:\Tools\ninja\ninja-%NINJA_TAG%
+  VCVAR2015: 'C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat'
+  VCVAR2017: 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat'
  matrix:
    - GSL_CXX_STANDARD: 14
+      USE_TOOLSET: MSVC
+      USE_GENERATOR: MSBuild
    - GSL_CXX_STANDARD: 17
+      USE_TOOLSET: MSVC
+      USE_GENERATOR: MSBuild
+    - GSL_CXX_STANDARD: 14
+      USE_TOOLSET: LLVM
+      USE_GENERATOR: Ninja
+    - GSL_CXX_STANDARD: 17
+      USE_TOOLSET: LLVM
+      USE_GENERATOR: Ninja

 matrix:
    exclude:
    - image: Visual Studio 2015
      GSL_CXX_STANDARD: 17
+    - image: Visual Studio 2015
+      USE_TOOLSET: LLVM
+      USE_GENERATOR: MSBuild

 cache:
  - C:\cmake-3.8.0-win32-x86
+  - C:\Tools\ninja

 install:
  - ps: |
-      if (![IO.File]::Exists("C:\cmake-3.8.0-win32-x86\bin\cmake.exe")) {
-        Start-FileDownload 'https://cmake.org/files/v3.8/cmake-3.8.0-win32-x86.zip'
-        7z x -y cmake-3.8.0-win32-x86.zip -oC:\
+      if (![IO.File]::Exists("$env:NINJA_PATH\ninja.exe")) {
+        Start-FileDownload `
+          "https://github.com/ninja-build/ninja/releases/download/$env:NINJA_TAG/ninja-win.zip"
+        $hash = (Get-FileHash ninja-win.zip -Algorithm SHA512).Hash
+        if ($env:NINJA_SHA512 -eq $hash) {
+          7z e -y -bso0 ninja-win.zip -o"$env:NINJA_PATH"
+        } else { Write-Warning "Ninja download hash changed!"; Write-Output "$hash" }
+      }
+      if ([IO.File]::Exists("$env:NINJA_PATH\ninja.exe")) {
+        $env:PATH = "$env:NINJA_PATH;$env:PATH"
+      } else { Write-Warning "Failed to find ninja.exe in expected location." }
+      if ($env:USE_TOOLSET -ne "LLVM") {
+        if (![IO.File]::Exists("C:\cmake-3.8.0-win32-x86\bin\cmake.exe")) {
+          Start-FileDownload 'https://cmake.org/files/v3.8/cmake-3.8.0-win32-x86.zip'
+          7z x -y -bso0 cmake-3.8.0-win32-x86.zip -oC:\
+        }
+        $env:PATH="C:\cmake-3.8.0-win32-x86\bin;$env:PATH"
      }
-      $env:PATH="C:\cmake-3.8.0-win32-x86\bin;$env:PATH"

 before_build:
  - ps: |
-      mkdir build
-      cd build
-
-      if ("$env:APPVEYOR_JOB_NAME" -match "Image: Visual Studio 2015") {
-          $env:generator="Visual Studio 14 2015"
+      if ("$env:USE_GENERATOR" -eq "Ninja") {
+        $GeneratorFlags = '-k 10'
+        $Architecture = $env:PLATFORM
+        if ("$env:APPVEYOR_BUILD_WORKER_IMAGE" -eq "Visual Studio 2015") {
+          $env:VCVARSALL = "`"$env:VCVAR2015`" $Architecture"
+        } else {
+          $env:VCVARSALL = "`"$env:VCVAR2017`" $Architecture"
+        }
+        $env:CMakeGenFlags = "-G Ninja -DGSL_CXX_STANDARD=$env:GSL_CXX_STANDARD"
      } else {
-          $env:generator="Visual Studio 15 2017"
+        $GeneratorFlags = '/m /v:minimal'
+        if ("$env:APPVEYOR_BUILD_WORKER_IMAGE" -eq "Visual Studio 2015") {
+          $Generator = 'Visual Studio 14 2015'
+        } else {
+          $Generator = 'Visual Studio 15 2017'
+        }
+        if ("$env:PLATFORM" -eq "x86") { 
+            $Architecture = "Win32"
+        } else { 
+            $Architecture = "x64" 
+        }
+        if ("$env:USE_TOOLSET" -eq "LLVM") {
+          $env:CMakeGenFlags = "-G `"$Generator`" -A $Architecture -T llvm -DGSL_CXX_STANDARD=$env:GSL_CXX_STANDARD"
+        } else {
+          $env:CMakeGenFlags = "-G `"$Generator`" -A $Architecture -DGSL_CXX_STANDARD=$env:GSL_CXX_STANDARD"
+        }
      }
-      if ($env:PLATFORM -eq "x64") {
-          $env:generator="$env:generator Win64"
+      if ("$env:USE_TOOLSET" -eq "LLVM") {
+        $env:CC  = "clang-cl"
+        $env:CXX = "clang-cl"
+        if ("$env:PLATFORM" -eq "x86") {
+          $env:CFLAGS   = "-m32";
+          $env:CXXFLAGS = "-m32";
+        } else {
+          $env:CFLAGS   = "-m64";
+          $env:CXXFLAGS = "-m64";
+        }
      }
-      echo generator="$env:generator"
-      cmake .. -G "$env:generator" -DGSL_CXX_STANDARD="$env:GSL_CXX_STANDARD"
+      $env:CMakeBuildFlags = "--config $env:CONFIGURATION -- $GeneratorFlags"
+  - mkdir build
+  - cd build
+  - if %USE_GENERATOR%==Ninja (call %VCVARSALL%)
+  - echo %CMakeGenFlags%
+  - cmake .. %CMakeGenFlags%

 build_script:
-  - cmake --build . --config %CONFIGURATION% -- /m /v:minimal
+  - echo %CMakeBuildFlags%
+  - cmake --build . %CMakeBuildFlags%

 test_script:
  - ctest -j2
--- a/include/gsl/gsl_assert
+++ b/include/gsl/gsl_assert
@ -22,17 +22,17 @@

 //
 // make suppress attributes parse for some compilers
-// Hopefully temporary until suppresion standardization occurs
+// Hopefully temporary until suppression standardization occurs
 //
-#if defined (_MSC_VER)
-#define GSL_SUPPRESS(x) [[gsl::suppress(x)]]
-#else
 #if defined(__clang__)
 #define GSL_SUPPRESS(x) [[gsl::suppress("x")]]
 #else
+#if defined(_MSC_VER)
+#define GSL_SUPPRESS(x) [[gsl::suppress(x)]]
+#else
 #define GSL_SUPPRESS(x)
-#endif // __clang__
 #endif // _MSC_VER
+#endif // __clang__

 //
 // Temporary until MSVC STL supports no-exceptions mode.
@ -42,6 +42,12 @@
 #define GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND
 #include <intrin.h>
 #define RANGE_CHECKS_FAILURE 0
+
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winvalid-noreturn"
+#endif
+
 #endif

 //
@ -138,7 +144,7 @@ namespace details
        throw std::forward<Exception>(exception);
    }

-#endif
+#endif // GSL_TERMINATE_ON_CONTRACT_VIOLATION

 } // namespace details
 } // namespace gsl
@ -159,9 +165,13 @@ namespace details

 #define GSL_CONTRACT_CHECK(type, cond) GSL_ASSUME(cond)

-#endif
+#endif // GSL_THROW_ON_CONTRACT_VIOLATION

 #define Expects(cond) GSL_CONTRACT_CHECK("Precondition", cond)
 #define Ensures(cond) GSL_CONTRACT_CHECK("Postcondition", cond)

+#if defined(GSL_MSVC_USE_STL_NOEXCEPTION_WORKAROUND) && defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
 #endif // GSL_CONTRACTS_H
--- a/include/gsl/gsl_byte
+++ b/include/gsl/gsl_byte
@ -19,17 +19,17 @@

 //
 // make suppress attributes work for some compilers
-// Hopefully temporary until suppresion standardization occurs
+// Hopefully temporary until suppression standardization occurs
 //
-#if defined(_MSC_VER)
-#define GSL_SUPPRESS(x) [[gsl::suppress(x)]]
-#else
 #if defined(__clang__)
 #define GSL_SUPPRESS(x) [[gsl::suppress("x")]]
 #else
+#if defined(_MSC_VER)
+#define GSL_SUPPRESS(x) [[gsl::suppress(x)]]
+#else
 #define GSL_SUPPRESS(x)
-#endif // __clang__
 #endif // _MSC_VER
+#endif // __clang__

 #include <type_traits>

@ -79,7 +79,7 @@
 #endif // _MSC_VER

 // Use __may_alias__ attribute on gcc and clang
-#if defined __clang__ || (__GNUC__ > 5)
+#if defined __clang__ || (defined(__GNUC__) && __GNUC__ > 5)
 #define byte_may_alias __attribute__((__may_alias__))
 #else // defined __clang__ || defined __GNUC__
 #define byte_may_alias
--- a/include/gsl/gsl_util
+++ b/include/gsl/gsl_util
@ -26,7 +26,7 @@
 #include <type_traits>      // for is_signed, integral_constant
 #include <utility>          // for forward

-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && !defined(__clang__)

 #pragma warning(push)
 #pragma warning(disable : 4127) // conditional expression is constant
@ -161,7 +161,7 @@ constexpr T at(const std::initializer_list<T> cont, const index i)

 } // namespace gsl

-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && !defined(__clang__)
 #if _MSC_VER < 1910
 #undef constexpr
 #pragma pop_macro("constexpr")
--- a/include/gsl/multi_span
+++ b/include/gsl/multi_span
@ -37,7 +37,7 @@
 #include <type_traits> // for enable_if_t, remove_cv_t, is_same, is_co...
 #include <utility>

-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)

 // turn off some warnings that are noisy about our Expects statements
 #pragma warning(push)
@ -62,7 +62,7 @@
 // compiletime, so the compiler wouldn't have to warn indiscriminently, but
 // could check if the source value actually doesn't fit into the target type
 // and only warn in those cases.
-#if __GNUC__ > 6
+#if defined(__GNUC__) && __GNUC__ > 6
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wsign-conversion"
 #endif
@ -596,7 +596,6 @@ public:
    using sliced_type = static_bounds<RestRanges...>;
    using mapping_type = contiguous_mapping_tag;

-    constexpr static_bounds(const static_bounds&) noexcept = default;
    constexpr static_bounds() /*noexcept*/ = default;

    template <typename SourceType, typename TargetType, std::size_t Rank>
@ -1887,6 +1886,8 @@ public:
        auto d = narrow_cast<size_type>(sizeof(OtherValueType) / sizeof(value_type));

        const size_type size = this->bounds().total_size() / d;
+
+        GSL_SUPPRESS(type.3) // NO-FORMAT: attribute
        return {const_cast<OtherValueType*>(reinterpret_cast<const OtherValueType*>(this->data())),
                size,
                bounds_type{resize_extent(this->bounds().index_bounds(), d),
@ -2274,7 +2275,7 @@ general_span_iterator<Span> operator+(typename general_span_iterator<Span>::diff

 } // namespace gsl

-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #if _MSC_VER < 1910

 #undef constexpr
@ -2285,7 +2286,7 @@ general_span_iterator<Span> operator+(typename general_span_iterator<Span>::diff

 #endif // _MSC_VER

-#if __GNUC__ > 6
+#if defined(__GNUC__) && __GNUC__ > 6
 #pragma GCC diagnostic pop
 #endif // __GNUC__ > 6

--- a/include/gsl/pointers
+++ b/include/gsl/pointers
@ -25,7 +25,7 @@
 #include <system_error> // for hash
 #include <type_traits>  // for enable_if_t, is_convertible, is_assignable

-#if defined(_MSC_VER) && _MSC_VER < 1910
+#if defined(_MSC_VER) && _MSC_VER < 1910 && !defined(__clang__)
 #pragma push_macro("constexpr")
 #define constexpr /*constexpr*/

@ -283,10 +283,12 @@ struct hash<gsl::strict_not_null<T>>
 };

 } // namespace std
-#if defined(_MSC_VER) && _MSC_VER < 1910
+
+#if defined(_MSC_VER) && _MSC_VER < 1910 && !defined(__clang__)
+
 #undef constexpr
 #pragma pop_macro("constexpr")

-#endif // defined(_MSC_VER) && _MSC_VER < 1910
+#endif // defined(_MSC_VER) && _MSC_VER < 1910 && !defined(__clang__)

 #endif // GSL_POINTERS_H
--- a/include/gsl/span
+++ b/include/gsl/span
@ -31,7 +31,7 @@
 #include <utility>
 #include <memory> // for std::addressof

-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #pragma warning(push)

 // turn off some warnings that are noisy about our Expects statements
@ -61,7 +61,7 @@
 // compiletime, so the compiler wouldn't have to warn indiscriminently, but
 // could check if the source value actually doesn't fit into the target type
 // and only warn in those cases.
-#if __GNUC__ > 6
+#if defined(__GNUC__) && __GNUC__ > 6
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wsign-conversion"
 #endif
@ -776,7 +776,7 @@ constexpr ElementType& at(span<ElementType, Extent> s, index i)

 } // namespace gsl

-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #if _MSC_VER < 1910
 #undef constexpr
 #pragma pop_macro("constexpr")
@ -786,7 +786,7 @@ constexpr ElementType& at(span<ElementType, Extent> s, index i)
 #pragma warning(pop)
 #endif // _MSC_VER

-#if __GNUC__ > 6
+#if defined(__GNUC__) && __GNUC__ > 6
 #pragma GCC diagnostic pop
 #endif // __GNUC__ > 6

--- a/include/gsl/string_span
+++ b/include/gsl/string_span
@ -30,7 +30,7 @@
 #include <string>      // for basic_string, allocator, char_traits
 #include <type_traits> // for declval, is_convertible, enable_if_t, add_...

-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #pragma warning(push)

 // Turn MSVC /analyze rules that generate too much noise. TODO: fix in the tool.
@ -706,7 +706,7 @@ bool operator>=(const T& one, gsl::basic_string_span<CharT, Extent> other)
 #endif
 } // namespace gsl

-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(__clang__)
 #pragma warning(pop)

 #if _MSC_VER < 1910
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.7)
+cmake_minimum_required(VERSION 3.0.2)

 project(GSLTests CXX)

@ -33,14 +33,24 @@ endif()
 # this interface adds compile options to how the tests are run
 # please try to keep entries ordered =)
 add_library(gsl_tests_config INTERFACE)
-target_compile_options(gsl_tests_config INTERFACE
-    $<$<CXX_COMPILER_ID:MSVC>:
+if(MSVC) # MSVC or simulating MSVC
+    target_compile_options(gsl_tests_config INTERFACE
+        ${GSL_CPLUSPLUS_OPT}
        /EHsc
        /W4
        /WX
-    >
-    ${GSL_CPLUSPLUS_OPT}
-    $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:
+        $<$<CXX_COMPILER_ID:Clang>:
+          -Weverything
+          -Wno-c++98-compat
+          -Wno-c++98-compat-pedantic
+          -Wno-missing-braces
+          -Wno-missing-prototypes
+          -Wno-unknown-attributes
+          $<$<EQUAL:${GSL_CXX_STANDARD},14>:-Wno-unused-member-function>
+        >
+    )
+else()
+    target_compile_options(gsl_tests_config INTERFACE
        -fno-strict-aliasing
        -Wall
        -Wcast-align
@ -48,16 +58,25 @@ target_compile_options(gsl_tests_config INTERFACE
        -Wctor-dtor-privacy
        -Werror
        -Wextra
-        -Wno-missing-braces
-        -Wno-unknown-attributes
-        -Wnon-virtual-dtor
-        -Wold-style-cast
-        -Woverloaded-virtual
        -Wpedantic
        -Wshadow
        -Wsign-conversion
-    >
-)
+        $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+          -Weverything
+          -Wno-c++98-compat
+          -Wno-c++98-compat-pedantic
+          -Wno-missing-braces
+          -Wno-missing-prototypes
+          -Wno-padded
+          -Wno-unknown-attributes
+          $<$<EQUAL:${GSL_CXX_STANDARD},14>:-Wno-unused-member-function>
+          -Wno-weak-vtables
+        >
+        $<$<CXX_COMPILER_ID:Clang>:
+          $<$<CXX_COMPILER_VERSION:5.0.2>:-Wno-undefined-func-template>
+        >
+    )
+endif(MSVC)

 # for tests to find the catch header
 target_include_directories(gsl_tests_config INTERFACE
@ -121,34 +140,49 @@ endforeach(flag_var)
 # this interface adds compile options to how the tests are run
 # please try to keep entries ordered =)
 add_library(gsl_tests_config_noexcept INTERFACE)
-target_compile_options(gsl_tests_config_noexcept INTERFACE
-    $<$<CXX_COMPILER_ID:MSVC>:
-        /D_HAS_EXCEPTIONS=0
-        /wd4702
-        /wd4577
+if(MSVC) # MSVC or simulating MSVC
+    target_compile_definitions(gsl_tests_config_noexcept INTERFACE
+        _HAS_EXCEPTIONS=0
+    )
+    target_compile_options(gsl_tests_config_noexcept INTERFACE
+        ${GSL_CPLUSPLUS_OPT}
        /W4
        /WX
-    >
-    ${GSL_CPLUSPLUS_OPT}
-    $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:
-        -fno-strict-aliasing
+        $<$<CXX_COMPILER_ID:MSVC>:
+          /wd4577
+          /wd4702
+        >
+        $<$<CXX_COMPILER_ID:Clang>:
+          -Weverything
+          -Wno-c++98-compat
+          -Wno-c++98-compat-pedantic
+          -Wno-missing-prototypes
+          -Wno-unknown-attributes
+        >
+    )
+else()
+    target_compile_options(gsl_tests_config_noexcept INTERFACE
        -fno-exceptions
+        -fno-strict-aliasing
        -Wall
        -Wcast-align
        -Wconversion
        -Wctor-dtor-privacy
        -Werror
        -Wextra
-        -Wno-missing-braces
-        -Wno-unknown-attributes
-        -Wnon-virtual-dtor
-        -Wold-style-cast
-        -Woverloaded-virtual
        -Wpedantic
        -Wshadow
        -Wsign-conversion
-    >
-)
+        $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+          -Weverything
+          -Wno-c++98-compat
+          -Wno-c++98-compat-pedantic
+          -Wno-missing-prototypes
+          -Wno-unknown-attributes
+          -Wno-weak-vtables
+        >
+    )
+endif(MSVC)

 # set definitions for tests
 target_compile_definitions(gsl_tests_config_noexcept INTERFACE
--- a/tests/no_exception_ensure_tests.cpp
+++ b/tests/no_exception_ensure_tests.cpp
@ -14,21 +14,17 @@
 //
 ///////////////////////////////////////////////////////////////////////////////

-#include <cstdlib>      // for std::exit
-#include <gsl/span>     // for span
+#include <cstdlib>  // for std::exit
+#include <gsl/span> // for span

 int operator_subscript_no_throw() noexcept
 {
    int arr[10];
-    const gsl::span<int> sp { arr };
+    const gsl::span<int> sp{arr};
    return sp[11];
 }

-
-void test_terminate()
-{ 
-    std::exit(0);
-}
+[[noreturn]] void test_terminate() { std::exit(0); }

 void setup_termination_handler() noexcept
 {
@ -44,7 +40,6 @@ void setup_termination_handler() noexcept
 #endif
 }

-
 int main() noexcept
 {
    setup_termination_handler();
--- a/tests/no_exception_throw_tests.cpp
+++ b/tests/no_exception_throw_tests.cpp
@ -14,9 +14,9 @@
 //
 ///////////////////////////////////////////////////////////////////////////////

-#include <cstdlib>      // for std::exit
-#include <gsl/gsl_util> // for narrow
+#include <cstdlib>        // for std::exit
 #include <gsl/gsl_assert> // for get_terminate
+#include <gsl/gsl_util>   // for narrow

 int narrow_no_throw()
 {
@ -24,10 +24,7 @@ int narrow_no_throw()
    return gsl::narrow<int>(bigNumber);
 }

-void test_terminate()
-{ 
-    std::exit(0);
-}
+[[noreturn]] void test_terminate() { std::exit(0); }

 void setup_termination_handler() noexcept
 {
@ -43,7 +40,6 @@ void setup_termination_handler() noexcept
 #endif
 }

-
 int main()
 {
    setup_termination_handler();
--- a/tests/notnull_tests.cpp
+++ b/tests/notnull_tests.cpp
@ -251,7 +251,7 @@ TEST_CASE("TestNotNullostream")
 {
    ostream_helper<int>(17);
    ostream_helper<float>(21.5f);
-    ostream_helper<double>(3.4566e-7f);
+    ostream_helper<double>(3.4566e-7);
    ostream_helper<char>('c');
    ostream_helper<uint16_t>(0x0123u);
    ostream_helper<const char*>("cstring");
--- a/tests/span_tests.cpp
+++ b/tests/span_tests.cpp
@ -37,9 +37,10 @@
 #include <type_traits> // for integral_constant<>::value, is_default_co...
 #include <vector>      // for vector

-namespace gsl {
+namespace gsl
+{
 struct fail_fast;
-}  // namespace gsl
+} // namespace gsl

 using namespace std;
 using namespace gsl;
@ -54,9 +55,12 @@ struct DerivedClass : BaseClass
 };
 struct AddressOverloaded
 {
+#if (__cplusplus > 201402L)
+    [[maybe_unused]]
+#endif
    AddressOverloaded operator&() const { return {}; }
 };
-}
+} // namespace

 GSL_SUPPRESS(con.4) // NO-FORMAT: attribute
 TEST_CASE("default_constructor")
@ -513,8 +517,8 @@ TEST_CASE("from_std_array_constructor")
        static span<int> s2;
        s2 = s1;

-    #if __GNUC__ == 6 && (__GNUC_MINOR__ == 4 || __GNUC_MINOR__ == 5) && __GNUC_PATCHLEVEL__ == 0 &&   \
-    defined(__OPTIMIZE__)
+    #if defined(__GNUC__) && __GNUC__ == 6 && (__GNUC_MINOR__ == 4 || __GNUC_MINOR__ == 5) &&      \
+    __GNUC_PATCHLEVEL__ == 0 && defined(__OPTIMIZE__)
        // Known to be broken in gcc 6.4 and 6.5 with optimizations
        // Issue in gcc: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83116
        CHECK(s1.size() == 4);
--- a/tests/strided_span_tests.cpp
+++ b/tests/strided_span_tests.cpp
@ -117,7 +117,7 @@ TEST_CASE("strided_span_constructors")
            CHECK(sav.bounds().strides() == multi_span_index<1>{1});
            CHECK(sav[1] == 2);

-#if _MSC_VER > 1800
+#if defined(_MSC_VER) && _MSC_VER > 1800
            // strided_span<const int, 1> sav_c{ {src}, {2, 1} };
            strided_span<const int, 1> sav_c{multi_span<const int>{src},
                                             strided_bounds<1>{2, 1}};
@ -129,7 +129,7 @@ TEST_CASE("strided_span_constructors")
            CHECK(sav_c.bounds().strides() == multi_span_index<1>{1});
            CHECK(sav_c[1] == 2);

-#if _MSC_VER > 1800
+#if defined(_MSC_VER) && _MSC_VER > 1800
            strided_span<volatile int, 1> sav_v{src, {2, 1}};
 #else
            strided_span<volatile int, 1> sav_v{multi_span<volatile int>{src},
@ -139,7 +139,7 @@ TEST_CASE("strided_span_constructors")
            CHECK(sav_v.bounds().strides() == multi_span_index<1>{1});
            CHECK(sav_v[1] == 2);

-#if _MSC_VER > 1800
+#if defined(_MSC_VER) && _MSC_VER > 1800
            strided_span<const volatile int, 1> sav_cv{src, {2, 1}};
 #else
            strided_span<const volatile int, 1> sav_cv{multi_span<const volatile int>{src},
@ -159,7 +159,7 @@ TEST_CASE("strided_span_constructors")
            CHECK(sav_c.bounds().strides() == multi_span_index<1>{1});
            CHECK(sav_c[1] == 2);

-#if _MSC_VER > 1800
+#if defined(_MSC_VER) && _MSC_VER > 1800
            strided_span<const volatile int, 1> sav_cv{src, {2, 1}};
 #else
            strided_span<const volatile int, 1> sav_cv{multi_span<const volatile int>{src},
@ -180,7 +180,7 @@ TEST_CASE("strided_span_constructors")
            CHECK(sav_v.bounds().strides() == multi_span_index<1>{1});
            CHECK(sav_v[1] == 2);

-#if _MSC_VER > 1800
+#if defined(_MSC_VER) && _MSC_VER > 1800
            strided_span<const volatile int, 1> sav_cv{src, {2, 1}};
 #else
            strided_span<const volatile int, 1> sav_cv{multi_span<const volatile int>{src},
@ -598,7 +598,7 @@ void iterate_every_other_element(multi_span<int, dynamic_range> av)
    // pick every other element

    auto length = av.size() / 2;
-#if _MSC_VER > 1800
+#if defined(_MSC_VER) && _MSC_VER > 1800
    auto bounds = strided_bounds<1>({length}, {2});
 #else
    auto bounds = strided_bounds<1>(multi_span_index<1>{length}, multi_span_index<1>{2});
--- a/tests/utils_tests.cpp
+++ b/tests/utils_tests.cpp
@ -80,7 +80,7 @@ TEST_CASE("finally_function_with_bind")
    CHECK(i == 1);
 }

-int j = 0;
+static int j = 0;
 void g() { j += 1; }
 TEST_CASE("finally_function_ptr")
 {