test MSVC /permissive with TOML_DISABLE_CONDITIONAL_NOEXCEPT_LAMBDA

Added "permissive" option to the ci matrix, for windows.

Used `TOML_DISABLE_CONDITIONAL_NOEXCEPT_LAMBDA` to avoid the compile errors reported by Kevin Dick, Jan 19, 2024, at issue #219

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

@@ -36,6 +36,7 @@ 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 +76,6 @@ global_args = cpp.get_supported_arguments(
 	'/Gy', # function-level linking
 	'/GF', # string pooling
 	'/openmp-',
-	'/permissive-',
 	'/utf-8',
 	'/volatile:iso',
 	'/Zc:__cplusplus',
@@ -88,6 +88,11 @@ 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', '-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

meson_options.txt

@@ -4,6 +4,7 @@ option('build_examples',		type: 'boolean', value: false,	description: 'Build the
 option('build_tests',			type: 'boolean', value: false,	description: 'Build tests (default: false) (implied by devel)')
 option('build_tt',				type: 'boolean', value: false,	description: 'Enable to build the toml-test encoder and decoder. (default: false) (implied by devel) (disabled by unreleased_features)')
 option('pedantic',				type: 'boolean', value: false,	description: 'Enable as many compiler warnings as possible (default: false) (implied by devel)')
+option('permissive',			type: 'boolean', value: false,	description: 'Add compiler option /permissive (default: false, which implies /permissive-) (only relevant for MSVC)')
 option('time_trace',			type: 'boolean', value: false,	description: 'Enable the -ftime-trace option (Clang only)')
 option('unreleased_features',	type: 'boolean', value: false,	description: 'Enable TOML_UNRELEASED_FEATURES=1 (default: false) (only relevant when compiling the library)')