draft (don't merge): add "permissive" option to ci matrix

Author: N-Dekker

.github/workflows/ci.yaml

@@ -112,6 +112,9 @@ jobs:
                 type:
                     - "debug"
                     - "release"
+                permissive:
+                    - false
+                    - true
 
         runs-on: windows-2022
 
@@ -130,7 +133,7 @@ jobs:
             - uses: ilammy/msvc-dev-cmd@v1
 
             - name: Configure Meson
-              run: meson setup build --vsenv --buildtype=${{ matrix.type }} -Ddevel=true -Db_lto=false
+              run: meson setup build --vsenv --buildtype=${{ matrix.type }} -Ddevel=true -Db_lto=false -Dpermissive=${{ matrix.permissive }}
 
             - name: Build
               run: meson compile -C build

meson.build

@@ -19,6 +19,7 @@ project(
 		'b_ndebug=if-release',
 		# compiler options
 		'cpp_std=c++17'
+		'permissive=false'
 	]
 )
 
@@ -36,6 +37,7 @@ is_devel = get_option('devel')
 is_debug = get_option('debug')
 is_release = not is_debug
 is_pedantic = get_option('pedantic') or is_devel
+is_permissive = get_option('permissive')
 is_windows = host_machine.system() == 'windows'
 is_x64 = host_machine.cpu_family() == 'x86_64'
 is_subproject = meson.is_subproject()
@@ -75,7 +77,6 @@ global_args = cpp.get_supported_arguments(
 	'/Gy', # function-level linking
 	'/GF', # string pooling
 	'/openmp-',
-	'/permissive-',
 	'/utf-8',
 	'/volatile:iso',
 	'/Zc:__cplusplus',
@@ -88,6 +89,11 @@ if has_exceptions
 else
 	global_args += cpp.get_supported_arguments('-D_HAS_EXCEPTIONS=0')
 endif
+if is_permissive
+	global_args += cpp.get_supported_arguments('/permissive') # TODO '-DTOML_DISABLE_CONDITIONAL_NOEXCEPT_LAMBDA=1')
+else
+	global_args += cpp.get_supported_arguments('/permissive-')
+endif
 if is_pedantic
 	global_args += cpp.get_supported_arguments(
 		# clang