etl/docs/source/meson.md
John Wellbelove 4a88884b39
Issue/add hugo support for documentation (#1449)
* Add ranges

* Initial Hugo setup

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* Added selection for local or remote site

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* Change to Hextra Hugo theme

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# Conflicts:
#	docs/releases/_index.md

* Work in progress

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# Conflicts:
#	docs/containers/array.md
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#	docs/containers/bip_buffer_spsc_atomic.md
#	docs/containers/bitset.md
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# Conflicts:
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# Conflicts:
#	docs/IO/io_port.md
#	docs/containers/sets/const-multiset.md
#	docs/containers/sets/const-set.md
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Updated the Python 'update_release.py' to copy 'version.txt'

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* Added a link to pseudo_moving_average.md

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* Fixed coordinate variable names in the 'Calculating the intersection' example

---------

Co-authored-by: Roland Reichwein <Roland.Reichwein@bmw.de>
Co-authored-by: John Wellbelove <john.wellbelove@etlcpp.com>
Co-authored-by: John Wellbelove <john.wellbelove@etlcpp.co.uk>
2026-06-06 13:12:44 +01:00

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3.3 KiB
Markdown

---
title: "Building ETL with Meson"
weight: 2
---
## 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.