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By DaanDeMeyer

Fangrui Song 2018-03-31 00:01:45 -07:00
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cquery has experimental support for the CMake build system.
To get started building cquery, first install the required dependencies:
* CMake 3.1 or higher
* C++ Compiler with C++14 support:
* Clang 3.4 or higher
* GCC 5 or higher
* MSVC 2017 or higher (included with VS2017 Build Tools)
After installing the required dependencies, clone the repository along with its
git submodules using:
`git clone https://github.com/cquery-project/cquery.git --recursive`
After cloning the repository, open a terminal and navigate to the cquery
directory. Then, create a build directory which will contain all files
related to the build. Enter the build directory.
From inside the build directory, we can then configure the project with the
following command: `cmake ..`
[**Windows**] On Windows you have to explicitly tell CMake to target 64-bit
architecture by adding the `-DCMAKE_GENERATOR_PLATFORM=x64` option to the
cmake invocation (`cmake -DCMAKE_GENERATOR_PLATFORM=x64 ..`). 32-bit builds
are not supported at the moment.
This command generates project files for your system's default generator (Linux:
make, Windows: MSBuild). CMake defaults to a Release build and links cquery
against the libclang library which it downloads from https://releases.llvm.org.
After CMake configuration cquery can be built from inside the build directory by
executing the corresponding generator command (Linux: `make`, Windows:
`MSBuild.exe`) or the generic CMake build command (`cmake --build .`)
## CMake Options
CMake options can be specified when running CMake to change its behaviour.
Options are passed to CMake via the command line by prepending them with -D. For
example: `cmake -DCMAKE_BUILD_TYPE=Debug ..` configures cquery to be built in
release mode.
* `-DCMAKE_BUILD_TYPE=(Debug|Release)`
`CMAKE_BUILD_TYPE` can be used to set the build type. There are a few possible
options, but the most important ones are Debug and Release. Generally you want
to pass `-DCMAKE_BUILD_TYPE=Release` to CMake to get the best performance out of
cquery. Debug is recommended when debugging cquery with a debugger. Since cquery
defaults to a Release build it usually isn't necessary to define this option
unless you're debugging an issue in cquery with a debugger.
* `-DSYSTEM_CLANG=(ON|OFF)`
Enable `SYSTEM_CLANG` if you want to use your own system installation of Clang
instead of downloading Clang during the configure process. This requires you to
have a recent installation of Clang/LLVM installed on your system. Note that
using system Clang is not recommended and there is a higher chance of bugs due
to possible version differences between downloaded Clang and system installed
Clang.
* `-DCMAKE_PREFIX_PATH="custom_install_path"`
When you want to use a system installed Clang but it is not installed into any
default CMake search location (for example if you built LLVM from source) you
can tell CMake where to search by adding search paths to `CMAKE_PREFIX_PATH`.
CMake searches the paths in `CMAKE_PREFIX_PATH` for 'include' and 'lib'
subdirectories containing the required Clang headers and libraries. For example,
to use a system installation of Clang on Windows you can add the following
option: `-DCMAKE_PREFIX_PATH="C:/Program Files/LLVM"`.
If the 'include' and 'lib' directories reside in two different parent
directories (possible when building LLVM from source) you will have to add both
these directories to CMAKE_PREFIX_PATH separated by a ';'
(`-DCMAKE\_PREFIX\_PATH="<include-parent-dir>;<lib-parent-dir>"`).