Fix meson build (#1431)

Co-authored-by: John Wellbelove <jwellbelove@users.noreply.github.com>

.github/workflows/meson-gcc-c++23-no-stl.yml

@@ -0,0 +1,31 @@
+name: meson-gcc-c++23-no-stl
+on:
+  push:
+    branches: [ master, development, pull-request/* ]
+  pull_request:
+    branches: [ master, development, pull-request/* ]
+    types: [opened, synchronize, reopened]
+
+jobs:
+
+  build-meson-gcc-cpp23-no-stl:
+    name: Meson GCC C++23 Linux - No STL
+    runs-on: ubuntu-24.04
+
+    steps:
+    - uses: actions/checkout@v6
+
+    - name: Install Meson
+      run: sudo apt-get install -y meson
+
+    - name: Configure
+      run: |
+        export CC=gcc
+        export CXX=g++
+        meson setup builddir -Duse_stl=false -Dcpp_std=c++23
+
+    - name: Build
+      run: meson compile -C builddir
+
+    - name: Run tests
+      run: meson test -C builddir -v

docs/meson.md

@@ -0,0 +1,116 @@
+# Building ETL with Meson
+
+## Prerequisites
+
+- [Meson](https://mesonbuild.com/) >= 0.57.0
+- A C++17 compiler (GCC, Clang, or MSVC)
+- [Ninja](https://ninja-build.org/) (default Meson backend)
+
+UnitTest++ is fetched automatically as a Meson subproject — no manual dependency installation is needed.
+
+## Quick Start
+
+```bash
+# Configure (from the project root)
+meson setup builddir
+
+# Build
+meson compile -C builddir
+
+# Run tests
+meson test -C builddir
+```
+
+## Build Options
+
+### ETL project options
+
+| Option              | Type | Default | Description                                                       |
+|---------------------|------|---------|-------------------------------------------------------------------|
+| `use_stl`           | bool | `true`  | Build with STL support. When `false`, defines `ETL_NO_STL`.       |
+| `enable_sanitizer`  | bool | `false` | Enable AddressSanitizer and UndefinedBehaviorSanitizer (GCC/Clang only). |
+
+### Meson built-in options
+
+| Option      | Type   | Default  | Description                                              |
+|-------------|--------|----------|----------------------------------------------------------|
+| `cpp_std`   | string | `c++17`  | C++ standard to compile with (e.g. `c++20`, `c++23`).   |
+| `buildtype` | string | `debug`  | Build type: `plain`, `debug`, `debugoptimized`, `release`, `minsize`. |
+| `werror`    | bool   | `false`  | Treat compiler warnings as errors.                       |
+
+These are handled by Meson directly — no `get_option()` call is needed in the build files.
+
+### Examples
+
+```bash
+# No STL, C++23
+meson setup builddir -Duse_stl=false -Dcpp_std=c++23
+
+# Release build with sanitizers
+meson setup builddir -Dbuildtype=release -Denable_sanitizer=true
+
+# Override the C++ standard on an existing build directory
+meson configure builddir -Dcpp_std=c++20
+```
+
+## Selecting a Compiler
+
+The compiler is chosen at configure time via environment variables:
+
+```bash
+# GCC
+CC=gcc CXX=g++ meson setup builddir
+
+# Clang
+CC=clang CXX=clang++ meson setup builddir
+
+# Specific versions
+CC=gcc-14 CXX=g++-14 meson setup builddir
+CC=clang-18 CXX=clang++-18 meson setup builddir
+```
+
+To switch compilers on an existing build directory, wipe it first:
+
+```bash
+CC=clang CXX=clang++ meson setup --wipe builddir
+```
+
+Or use separate directories per compiler:
+
+```bash
+CC=gcc CXX=g++ meson setup build-gcc
+CC=clang CXX=clang++ meson setup build-clang
+```
+
+## Running Tests
+
+```bash
+# Run all tests
+meson test -C builddir
+
+# Verbose output (shows individual test results)
+meson test -C builddir -v
+
+# Run the test binary directly
+./builddir/test/etl_unit_tests
+```
+
+## Sanitizers
+
+On GCC and Clang, AddressSanitizer and UndefinedBehaviorSanitizer can be enabled via the `enable_sanitizer` option:
+
+```bash
+meson setup builddir -Denable_sanitizer=true
+```
+
+Note: UBSan may prevent certain `constexpr` evaluations involving function pointers from compiling (e.g. in the closure tests). This matches the CMake build, where sanitizers are also opt-in via `ETL_ENABLE_SANITIZER=ON`.
+
+## Using ETL as a Subproject
+
+ETL can be consumed as a Meson subproject. In your project's `subprojects/` directory, create an `etl.wrap` file, then use:
+
+```meson
+etl_dep = dependency('etl', fallback: ['etl', 'etl_dep'])
+```
+
+When built as a subproject, the ETL test suite is not compiled.

meson_options.txt

@@ -1 +1,2 @@
 option('use_stl', description: 'Compiling for STL', type: 'boolean', value: true)
+option('enable_sanitizer', description: 'Enable address and undefined behavior sanitizers', type: 'boolean', value: false)

test/meson.build

@@ -1,4 +1,3 @@
-
 etl_test_sources = files(
 	'main.cpp',
 	'murmurhash3.cpp',
@@ -8,48 +7,91 @@ etl_test_sources = files(
 	'test_array_view.cpp',
 	'test_array_wrapper.cpp',
 	'test_atomic.cpp',
-	'test_base64_RFC2152_decoder.cppp',
+	'test_base64_RFC2152_decoder.cpp',
-	'test_base64_RFC2152_encoder.cppp',
+	'test_base64_RFC2152_encoder.cpp',
-	'test_base64_RFC3501_decoder.cppp',
+	'test_base64_RFC3501_decoder.cpp',
-	'test_base64_RFC3501_encoder.cppp',
+	'test_base64_RFC3501_encoder.cpp',
-	'test_base64_RFC4648_decoder_with_no_padding.cppp',
+	'test_base64_RFC4648_URL_decoder_with_no_padding.cpp',
-	'test_base64_RFC4648_decoder_with_padding.cppp',
+	'test_base64_RFC4648_URL_decoder_with_padding.cpp',
-	'test_base64_RFC4648_encoder_with_no_padding.cppp',
+	'test_base64_RFC4648_URL_encoder_with_no_padding.cpp',
-	'test_base64_RFC4648_encoder_with_padding.cppp',
-	'test_base64_RFC4648_URL_decoder_with_no_padding.cppp',
-	'test_base64_RFC4648_URL_decoder_with_padding.cppp',
-	'test_base64_RFC4648_URL_encoder_with_no_padding.cppp',
 	'test_base64_RFC4648_URL_encoder_with_padding.cpp',
+	'test_base64_RFC4648_decoder_with_no_padding.cpp',
+	'test_base64_RFC4648_decoder_with_padding.cpp',
+	'test_base64_RFC4648_encoder_with_no_padding.cpp',
+	'test_base64_RFC4648_encoder_with_padding.cpp',
 	'test_binary.cpp',
 	'test_bip_buffer_spsc_atomic.cpp',
 	'test_bit.cpp',
-	'test_bitset_legacy.cpp',
-	'test_bitset_new_default_element_type.cpp',
-	'test_bitset_new_explicit_single_element_type.cpp',
-	'test_bitset_new_ext_default_element_type.cpp',
-	'test_bitset_new_ext_explicit_single_element_type.cpp',
 	'test_bit_stream.cpp',
 	'test_bit_stream_reader_big_endian.cpp',
 	'test_bit_stream_reader_little_endian.cpp',
 	'test_bit_stream_writer_big_endian.cpp',
 	'test_bit_stream_writer_little_endian.cpp',
-	'test_byte.cpp',
+	'test_bitset_legacy.cpp',
-	'test_byte_stream.cpp',
+	'test_bitset_new_comparisons.cpp',
+	'test_bitset_new_default_element_type.cpp',
+	'test_bitset_new_explicit_single_element_type.cpp',
+	'test_bitset_new_ext_default_element_type.cpp',
+	'test_bitset_new_ext_explicit_single_element_type.cpp',
 	'test_bloom_filter.cpp',
 	'test_bresenham_line.cpp',
 	'test_bsd_checksum.cpp',
 	'test_buffer_descriptors.cpp',
+	'test_byte.cpp',
+	'test_byte_stream.cpp',
 	'test_callback_service.cpp',
 	'test_callback_timer.cpp',
 	'test_callback_timer_atomic.cpp',
+	'test_callback_timer_deferred_locked.cpp',
 	'test_callback_timer_interrupt.cpp',
 	'test_callback_timer_locked.cpp',
+	'test_char_traits.cpp',
 	'test_checksum.cpp',
+	'test_chrono_clocks.cpp',
+	'test_chrono_day.cpp',
+	'test_chrono_duration.cpp',
+	'test_chrono_hh_mm_ss.cpp',
+	'test_chrono_literals.cpp',
+	'test_chrono_month.cpp',
+	'test_chrono_month_day.cpp',
+	'test_chrono_month_day_last.cpp',
+	'test_chrono_month_weekday.cpp',
+	'test_chrono_month_weekday_last.cpp',
+	'test_chrono_operators.cpp',
+	'test_chrono_time_point.cpp',
+	'test_chrono_weekday.cpp',
+	'test_chrono_weekday_indexed.cpp',
+	'test_chrono_weekday_last.cpp',
+	'test_chrono_year.cpp',
+	'test_chrono_year_month.cpp',
+	'test_chrono_year_month_day.cpp',
+	'test_chrono_year_month_day_last.cpp',
+	'test_chrono_year_month_weekday.cpp',
+	'test_chrono_year_month_weekday_last.cpp',
 	'test_circular_buffer.cpp',
 	'test_circular_buffer_external_buffer.cpp',
 	'test_circular_iterator.cpp',
+	'test_closure_with_default_delegate.cpp',
+	'test_closure_with_default_delegate_constexpr.cpp',
+	'test_closure_with_inplace_function.cpp',
 	'test_compare.cpp',
-	'test_compiler_settings.cpp',
+	'test_concepts.cpp',
+	'test_const_map.cpp',
+	'test_const_map_constexpr.cpp',
+	'test_const_map_ext.cpp',
+	'test_const_map_ext_constexpr.cpp',
+	'test_const_multimap.cpp',
+	'test_const_multimap_constexpr.cpp',
+	'test_const_multimap_ext.cpp',
+	'test_const_multimap_ext_constexpr.cpp',
+	'test_const_multiset.cpp',
+	'test_const_multiset_constexpr.cpp',
+	'test_const_multiset_ext.cpp',
+	'test_const_multiset_ext_constexpr.cpp',
+	'test_const_set.cpp',
+	'test_const_set_constexpr.cpp',
+	'test_const_set_ext.cpp',
+	'test_const_set_ext_constexpr.cpp',
 	'test_constant.cpp',
 	'test_container.cpp',
 	'test_correlation.cpp',
@@ -69,9 +111,12 @@ etl_test_sources = files(
 	'test_crc16_en13757.cpp',
 	'test_crc16_genibus.cpp',
 	'test_crc16_kermit.cpp',
+	'test_crc16_m17.cpp',
 	'test_crc16_maxim.cpp',
 	'test_crc16_mcrf4xx.cpp',
 	'test_crc16_modbus.cpp',
+	'test_crc16_opensafety_a.cpp',
+	'test_crc16_opensafety_b.cpp',
 	'test_crc16_profibus.cpp',
 	'test_crc16_riello.cpp',
 	'test_crc16_t10dif.cpp',
@@ -90,6 +135,7 @@ etl_test_sources = files(
 	'test_crc32_q.cpp',
 	'test_crc32_xfer.cpp',
 	'test_crc64_ecma.cpp',
+	'test_crc64_iso.cpp',
 	'test_crc8_ccitt.cpp',
 	'test_crc8_cdma2000.cpp',
 	'test_crc8_darc.cpp',
@@ -97,21 +143,29 @@ etl_test_sources = files(
 	'test_crc8_ebu.cpp',
 	'test_crc8_icode.cpp',
 	'test_crc8_itu.cpp',
+	'test_crc8_j1850.cpp',
+	'test_crc8_j1850_zero.cpp',
 	'test_crc8_maxim.cpp',
+	'test_crc8_nrsc5.cpp',
+	'test_crc8_opensafety.cpp',
 	'test_crc8_rohc.cpp',
 	'test_crc8_wcdma.cpp',
 	'test_cyclic_value.cpp',
 	'test_debounce.cpp',
 	'test_delegate.cpp',
 	'test_delegate_cpp03.cpp',
+	'test_delegate_observable.cpp',
 	'test_delegate_service.cpp',
 	'test_delegate_service_compile_time.cpp',
+	'test_delegate_service_cpp03.cpp',
 	'test_deque.cpp',
 	'test_endian.cpp',
 	'test_enum_type.cpp',
 	'test_error_handler.cpp',
+	'test_etl_assert.cpp',
 	'test_etl_traits.cpp',
 	'test_exception.cpp',
+	'test_expected.cpp',
 	'test_fixed_iterator.cpp',
 	'test_fixed_sized_memory_block_allocator.cpp',
 	'test_flags.cpp',
@@ -120,18 +174,24 @@ etl_test_sources = files(
 	'test_flat_multiset.cpp',
 	'test_flat_set.cpp',
 	'test_fnv_1.cpp',
+	'test_format.cpp',
 	'test_format_spec.cpp',
 	'test_forward_list.cpp',
 	'test_forward_list_shared_pool.cpp',
 	'test_fsm.cpp',
 	'test_function.cpp',
+	'test_function_traits.cpp',
 	'test_functional.cpp',
 	'test_gamma.cpp',
 	'test_hash.cpp',
 	'test_hfsm.cpp',
+	'test_hfsm_recurse_to_inner_state_on_start.cpp',
+	'test_hfsm_transition_on_enter.cpp',
 	'test_histogram.cpp',
+	'test_index_of_type.cpp',
 	'test_indirect_vector.cpp',
 	'test_indirect_vector_external_buffer.cpp',
+	'test_inplace_function.cpp',
 	'test_instance_count.cpp',
 	'test_integral_limits.cpp',
 	'test_intrusive_forward_list.cpp',
@@ -140,7 +200,9 @@ etl_test_sources = files(
 	'test_intrusive_queue.cpp',
 	'test_intrusive_stack.cpp',
 	'test_invert.cpp',
+	'test_invoke.cpp',
 	'test_io_port.cpp',
+	'test_is_invocable.cpp',
 	'test_iterator.cpp',
 	'test_jenkins.cpp',
 	'test_largest.cpp',
@@ -148,14 +210,17 @@ etl_test_sources = files(
 	'test_limits.cpp',
 	'test_list.cpp',
 	'test_list_shared_pool.cpp',
+	'test_macros.cpp',
 	'test_make_string.cpp',
+	'test_manchester.cpp',
 	'test_map.cpp',
 	'test_math.cpp',
 	'test_math_functions.cpp',
 	'test_mean.cpp',
 	'test_mem_cast.cpp',
 	'test_mem_cast_ptr.cpp',
-    'test_memory.cpp',
+	'test_memory.cpp',
+	'test_message.cpp',
 	'test_message_broker.cpp',
 	'test_message_bus.cpp',
 	'test_message_packet.cpp',
@@ -163,18 +228,23 @@ etl_test_sources = files(
 	'test_message_router_registry.cpp',
 	'test_message_timer.cpp',
 	'test_message_timer_atomic.cpp',
-    'test_message_timer_interrupt.cpp',
+	'test_message_timer_interrupt.cpp',
 	'test_message_timer_locked.cpp',
-	'test_multimap.cpp',
-	'test_multiset.cpp',
 	'test_multi_array.cpp',
 	'test_multi_range.cpp',
+	'test_multi_span.cpp',
 	'test_multi_vector.cpp',
+	'test_multimap.cpp',
+	'test_multiset.cpp',
 	'test_murmur3.cpp',
+	'test_not_null_pointer.cpp',
+	'test_not_null_pointer_constexpr.cpp',
+	'test_not_null_unique_pointer.cpp',
 	'test_nth_type.cpp',
 	'test_numeric.cpp',
 	'test_observer.cpp',
 	'test_optional.cpp',
+	'test_overload.cpp',
 	'test_packet.cpp',
 	'test_parameter_pack.cpp',
 	'test_parameter_type.cpp',
@@ -184,6 +254,7 @@ etl_test_sources = files(
 	'test_poly_span_fixed_extent.cpp',
 	'test_pool.cpp',
 	'test_pool_external_buffer.cpp',
+	'test_print.cpp',
 	'test_priority_queue.cpp',
 	'test_pseudo_moving_average.cpp',
 	'test_quantize.cpp',
@@ -200,45 +271,54 @@ etl_test_sources = files(
 	'test_queue_spsc_locked.cpp',
 	'test_queue_spsc_locked_small.cpp',
 	'test_random.cpp',
+	'test_ranges.cpp',
+	'test_ratio.cpp',
 	'test_reference_flat_map.cpp',
 	'test_reference_flat_multimap.cpp',
 	'test_reference_flat_multiset.cpp',
 	'test_reference_flat_set.cpp',
 	'test_rescale.cpp',
+	'test_result.cpp',
 	'test_rms.cpp',
+	'test_rounded_integral_division.cpp',
 	'test_scaled_rounding.cpp',
 	'test_set.cpp',
 	'test_shared_message.cpp',
+	'test_signal.cpp',
 	'test_singleton.cpp',
+	'test_singleton_base.cpp',
 	'test_smallest.cpp',
 	'test_span_dynamic_extent.cpp',
 	'test_span_fixed_extent.cpp',
 	'test_stack.cpp',
 	'test_standard_deviation.cpp',
 	'test_state_chart.cpp',
-	'test_state_chart_with_data_parameter.cpp',
-	'test_state_chart_with_rvalue_data_parameter.cpp',
 	'test_state_chart_compile_time.cpp',
 	'test_state_chart_compile_time_with_data_parameter.cpp',
+	'test_state_chart_with_data_parameter.cpp',
+	'test_state_chart_with_rvalue_data_parameter.cpp',
 	'test_string_char.cpp',
 	'test_string_char_external_buffer.cpp',
 	'test_string_stream.cpp',
-    'test_string_u8.cpp',
-	'test_string_u8_external_buffer.cpp',
 	'test_string_stream_u16.cpp',
 	'test_string_stream_u32.cpp',
+	'test_string_stream_u8.cpp',
 	'test_string_stream_wchar_t.cpp',
 	'test_string_u16.cpp',
 	'test_string_u16_external_buffer.cpp',
 	'test_string_u32.cpp',
 	'test_string_u32_external_buffer.cpp',
+	'test_string_u8.cpp',
+	'test_string_u8_external_buffer.cpp',
 	'test_string_utilities.cpp',
 	'test_string_utilities_std.cpp',
 	'test_string_utilities_std_u16.cpp',
 	'test_string_utilities_std_u32.cpp',
+	'test_string_utilities_std_u8.cpp',
 	'test_string_utilities_std_wchar_t.cpp',
 	'test_string_utilities_u16.cpp',
 	'test_string_utilities_u32.cpp',
+	'test_string_utilities_u8.cpp',
 	'test_string_utilities_wchar_t.cpp',
 	'test_string_view.cpp',
 	'test_string_wchar_t.cpp',
@@ -246,17 +326,25 @@ etl_test_sources = files(
 	'test_successor.cpp',
 	'test_task_scheduler.cpp',
 	'test_threshold.cpp',
+	'test_to_arithmetic.cpp',
+	'test_to_arithmetic_u16.cpp',
+	'test_to_arithmetic_u32.cpp',
+	'test_to_arithmetic_u8.cpp',
+	'test_to_arithmetic_wchar_t.cpp',
 	'test_to_string.cpp',
-	'test_to_u8string.cpp',
 	'test_to_u16string.cpp',
 	'test_to_u32string.cpp',
+	'test_to_u8string.cpp',
 	'test_to_wstring.cpp',
+	'test_tuple.cpp',
 	'test_type_def.cpp',
+	'test_type_list.cpp',
 	'test_type_lookup.cpp',
 	'test_type_select.cpp',
 	'test_type_traits.cpp',
 	'test_unaligned_type.cpp',
-	'test_unaligned_type_constexpr.cpp',
+	'test_unaligned_type_ext.cpp',
+	'test_uncopyable.cpp',
 	'test_unordered_map.cpp',
 	'test_unordered_multimap.cpp',
 	'test_unordered_multiset.cpp',
@@ -265,9 +353,9 @@ etl_test_sources = files(
 	'test_utility.cpp',
 	'test_variance.cpp',
 	'test_variant_legacy.cpp',
-	'test_variant_variadic.cpp',
 	'test_variant_pool.cpp',
 	'test_variant_pool_external_buffer.cpp',
+	'test_variant_variadic.cpp',
 	'test_vector.cpp',
 	'test_vector_external_buffer.cpp',
 	'test_vector_non_trivial.cpp',
@@ -280,24 +368,26 @@ etl_test_sources = files(
 
 compile_args = [
     '-DENABLE_ETL_UNIT_TESTS',
-    '-DETL_DEBUG',
 ]
 link_args = []
 
 if get_option('use_stl')
     compile_args += '-DETL_NO_STL=0'
-elif
+else
     compile_args += '-DETL_NO_STL=1'
 endif
 
 if meson.get_compiler('cpp').get_argument_syntax() == 'gcc'
-    compile_args += '-fsanitize=address,undefined'
     compile_args += '-fexceptions'
     compile_args += '-Wall'
-    compile_args += '-Wextra'    
+    compile_args += '-Wextra'
     compile_args += '-Wno-non-virtual-dtor' #TODO remove and fix warning in code
     compile_args += '-Werror'
-    link_args += '-fsanitize=address,undefined'
+
+    if get_option('enable_sanitizer')
+        compile_args += '-fsanitize=address,undefined'
+        link_args += '-fsanitize=address,undefined'
+    endif
 endif
 
 threads_dep = dependency('threads')