This introduces a CMakePresets file for both Unix-likes and Windows that replace the old CMakeSettings.
It adds presets for **Debug** and **Release** profiles for both **x64** and **ARM64** architectures, as well as **Generic builds**.
Presets can be used using[ Visual Studio's built-in CMakePresets support](https://learn.microsoft.com/en-us/cpp/build/cmake-presets-vs?view=msvc-170), or [Visual Studio Code's CMake Tools](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cmake-tools) extension.
They can also be used from the command line, like so:
- x64/Unix-like/Ninja:
- Configure: `cmake --preset ninja-release-x64`
- Build: `cmake --build --preset ninja-build-release-x64`
- Configure + Build: `cmake --workflow --preset ninja-release-x64`
- ARM64/Windows/Visual Studio:
- Configure: `cmake --preset visualstudio-release-arm64`
- Build: `cmake --build --preset visualstudio-build-release-arm64`
- Configure + Build: `cmake --workflow --preset visualstudio-release-arm64`
The Ninja generator is available to both Windows and Unix-likes, while the Visual Studio Generator is only available on Windows.
**Cross-compiling**
On **Windows**, the Visual Studio generator automatically takes care of everything, you just need to select an ARM64 preset.
On **Unix-likes**, to cross-compile you need to install a cross-compiler and (optionally) a sysroot of the target system.
Here is an example to compile from x64 to ARM64 with a sysroot:
- `cmake --preset ninja-release-arm64 -DCMAKE_C_COMPILER=aarch64-linux-gnu-gcc -DCMAKE_CXX_COMPILER=aarch64-linux-gnu-g++ -DCMAKE_SYSROOT=/opt/sysroots/aarch64-linux-gnu`
- `cmake --build --preset ninja-build-release-arm64`
You will need a sysroot to link against Qt, since we do not vendor it in on platforms other than Windows.
**User presets**
A `CMakeUserPresets.json` file may be created locally at the root of the project to further customize your presets.
For example, here are the user presets I used to test this PR on Arch Linux with a generic Arch Linux ARM sysroot:
```json
{
"version": 10,
"configurePresets": [
{
"name": "gcc-debug-arm64",
"inherits": "ninja-debug-arm64",
"cacheVariables": {
"CMAKE_C_COMPILER": "aarch64-linux-gnu-gcc",
"CMAKE_CXX_COMPILER": "aarch64-linux-gnu-g++",
"CMAKE_EXE_LINKER_FLAGS": "-L/opt/sysroots/ArchLinuxARM/lib",
"CMAKE_SYSROOT": "/opt/sysroots/ArchLinuxARM"
}
},
{
"name": "clang-debug-arm64",
"inherits": "ninja-debug-arm64",
"cacheVariables": {
"CMAKE_C_COMPILER": "clang",
"CMAKE_CXX_COMPILER": "clang++",
"CMAKE_C_FLAGS": "-target aarch64-linux-gnu",
"CMAKE_CXX_FLAGS": "-target aarch64-linux-gnu",
"CMAKE_SYSROOT": "/opt/sysroots/ArchLinuxARM"
}
},
{
"name": "clang-debug-x64",
"inherits": "ninja-debug-x64",
"cacheVariables": {
"CMAKE_C_COMPILER": "clang",
"CMAKE_CXX_COMPILER": "clang++"
}
}
],
"buildPresets": [
{
"name": "gcc-build-debug-arm64",
"configurePreset": "gcc-debug-arm64"
},
{
"name": "clang-build-debug-arm64",
"configurePreset": "clang-debug-arm64"
},
{
"name": "clang-build-debug-x64",
"configurePreset": "clang-debug-x64"
}
],
"workflowPresets": [
{
"name": "gcc-debug-arm64",
"steps": [
{ "type": "configure", "name": "gcc-debug-arm64" },
{ "type": "build", "name": "gcc-build-debug-arm64" }
]
},
{
"name": "clang-debug-arm64",
"steps": [
{ "type": "configure", "name": "clang-debug-arm64" },
{ "type": "build", "name": "clang-build-debug-arm64" }
]
},
{
"name": "clang-debug-x64",
"steps": [
{ "type": "configure", "name": "clang-debug-x64" },
{ "type": "build", "name": "clang-build-debug-x64" }
]
}
]
}
```
They are then used like so:
Configure + Build with GCC: `cmake --workflow --preset gcc-debug-arm64`
Configure + Build with Clang: `cmake --workflow --preset clang-debug-arm64`
Configure + Build with Clang (x64): `cmake --workflow --preset clang-debug-x64`
*Addendum: It should also now be possible to cross-compile from Windows to Unix-likes, and Unix-like to other Unix-like (e.g. Linux -> FreeBSD), however this is untested.*
Our FindLibUSB.cmake was previously entirely unused unless SDL was being built from Externals, we now rely on it again. It will use PkgConfig if applicable or fall back to looking around on the system, and more importantly it will always create an imported target.
Currently, configuring from System>Bundled doesn't work, it instead produces cryptic errors. And configuring from Bundled>System wont produce errors, but wont use the system libraries either. This change produces a clear error in both cases.
OProfile is not used at all these days, most major distributions do not ship it anymore (Debian, Fedora, and Alpine to name the few I've checked) and following a discussion on Discord, nobody is apparently using it, most devs not even being aware of it. This removes an optional dependency from Dolphin.
Some generators (like Unix Makefiles and Xcode) copy an app's Info.plist at configure time.
This causes a problem when we need to generate the Info.plist at build time, like how we
currently do it with ScmRevGen. Instead of generating the Info.plist directly in ScmRevGen,
provide an Info.plist without any version information to CMake at configure time, have
ScmRevGen generate a separate plist file with the version information at build time, and
then merge the two together to create the final Info.plist.
The official ccache documentation[1] recommends to set
`CMAKE_C(XX)_COMPILER_LAUNCHER` to ccache to enable ccache.
These also work as envionment variables (supported by CMake itself).
However, using these instructions generates the following error during
building:
ccache: error: Recursive invocation (the name of the ccache binary must be "ccache")
This is because Dolphin adds an additional command ccache layer (ccache
ccache compiler ...).
This fixes that issue by checking for `CMAKE_C(XX)_COMPILER_LAUNCHER`
before inserting our own. Also, use `CMAKE_C(XX)_COMPILER_LAUNCHER`
to add ccache because the CMake docs discourages the use of
`RULE_LAUNCH_COMPILE` in favour of `CMAKE_C(XX)_COMPILER_LAUNCHER`.
[1]: https://github.com/ccache/ccache/wiki/CMake
