cmake-common
============

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Various utilities to help develop C++/CMake projects.

Toolchains
----------

Supported platform/build system/compiler combinations include, but are not
limited to:

| Platform | Build system | Compiler
| -------- | ------------ | --------
| Linux    | make         | Clang
|          |              | GCC
|          |              | MinGW-w64
| Windows  | make \[1\]   | Clang (clang/clang++)
|          |              | Clang (clang-cl \[2\])
|          |              | MinGW-w64
|          | msbuild      | MSVC
| Cygwin   | make         | Clang
|          |              | GCC
|          |              | MinGW-w64

1. Both GNU `make` and MinGW `mingw32-make`.
2. Boost 1.69.0 or higher only.

All of those are verified continuously by the "Boost (toolsets)" and "Examples
(toolsets)" workflows.

Usage
-----

### common.cmake

Use in a project by putting

    include(path/to/common.cmake)

in CMakeLists.txt.

This file aids in quick-and-dirty development by

* linking everything (including the runtime) statically by default,
* setting some useful compilation options (enables warnings, defines useful
Windows-specific macros, strips debug symbols in release builds, etc.).

Everything is optional (use the `CC_*` CMake options to opt out).

### Boost

Download & build the Boost libraries in a cross-platform way.

    $ python3 -m project.boost.download 1.72.0
    ...

    $ python3 -m project.boost.build -- boost_1_72_0/ --with-filesystem --with-program_options
    ...

Pass the `--help` flag to view detailed usage information.

    $ python3 -m project.boost.download --help
    $ python3 -m project.boost.build --help

### CMake project

Build (and optionally, install) a CMake project.

    $ python3 -m project.cmake.build --configuration Release --install path/to/somewhere -- examples/simple
    ...

    $ ./path/to/somewhere/bin/foo
    foo

Pass the `--help` flag to view detailed usage information.

    $ python3 -m project.cmake.build --help

### CI

Utility modules `project.ci.boost` and `project.ci.cmake` allow building Boost
and CMake projects on multiple CI systems.
They work by calling the generic scripts from above, auto-filling some
parameters from environment variables.

|                   | Travis                               | AppVeyor                                   | GitHub Actions
| ----------------- | ------------------------------------ | ------------------------------------------ | ------------------------------------
| `--toolset`       | `$TOOLSET`                           | `%TOOLSET%`                                | `$TOOLSET`
| `--platform`      | `$PLATFORM`                          | `%PLATFORM%`                               | `$PLATFORM`
| `--configuration` | `$CONFIGURATION`                     | `%CONFIGURATION%`                          | `$CONFIGURATION`
| Boost version     | `$BOOST_VERSION`                     | `%BOOST_VERSION%`                          | `$BOOST_VERSION`
| Boost path        | `$TRAVIS_BUILD_DIR/../build/boost`   | `%APPVEYOR_BUILD_FOLDER%\..\build\boost`   | `$GITHUB_WORKSPACE/../build/boost`
| Build path        | `$TRAVIS_BUILD_DIR/../build/cmake`   | `%APPVEYOR_BUILD_FOLDER%\..\build\cmake`   | `$GITHUB_WORKSPACE/../build/cmake`
| Install path      | `$TRAVIS_BUILD_DIR/../build/install` | `%APPVEYOR_BUILD_FOLDER%\..\build\install` | `$GITHUB_WORKSPACE/../build/install`

For example, the following Travis workflow:

```
language: cpp
os: linux
dist: focal

env:
  global:
    boost_version: 1.65.0
  jobs:
    - configuration=Debug   platform=x64
    - configuration=Release platform=x64

before_script: python3 -m project.ci.boost -- --with-filesystem
script: python3 -m project.ci.cmake --install
```

is roughly equivalent to running

```
python3 -m project.boost.download --cache "$TRAVIS_BUILD_DIR/../build" -- 1.65.0
mv -- \
    "$TRAVIS_BUILD_DIR/../build/boost_1_65_0" \
    "$TRAVIS_BUILD_DIR/../build/boost"

python3 -m project.boost.build         \
    --platform x64                     \
    --configuration Debug Release      \
    --                                 \
    "$TRAVIS_BUILD_DIR/../build/boost" \
    --with-filesystem

for configuration in Debug Release; do
    python3 -m project.cmake.build                     \
        --platform x64                                 \
        --configuration "$configuration"               \
        --boost "$TRAVIS_BUILD_DIR/../build/boost"     \
        --build "$TRAVIS_BUILD_DIR/../build/cmake"     \
        --install "$TRAVIS_BUILD_DIR/../build/install" \
        --                                             \
        "$TRAVIS_BUILD_DIR"
done
```

Tools
-----

* [project-clang-format] — `clang-format` all C/C++ files in the project.
* [ctest-driver] — wrap an executable for testing with CTest;
cross-platform `grep`.

[project-clang-format]: docs/project-clang-format.md
[ctest-driver]: docs/ctest-driver.md

Examples
--------

I use this in all of my C++/CMake projects, e.g. [aes-tools] and [math-server].

[aes-tools]: https://github.com/egor-tensin/aes-tools
[math-server]: https://github.com/egor-tensin/math-server

License
-------

Distributed under the MIT License.
See [LICENSE.txt] for details.

[LICENSE.txt]: LICENSE.txt