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An error was reported when compiling with the krita source code:
This code is a fragment of the CMakeLists.txt file in the Krita source code, which is used to configure the build system of the Krita project. Here is an explanation of this code:
find_package(Boost 1.65 REQUIRED COMPONENTS system): This line instructs CMake to find and load the configuration information of the Boost library, requiring a Boost version of at least 1.65 and including the "system" component.
set_package_properties(Boost PROPERTIES ...): This section sets some properties of the Boost package, including description, URL and type. These properties are typically used when generating package management or other metadata for a project.
target_link_libraries (Boost::boost ...) : Link Boost::boost targets with other targets. Here, the Boost::disable_autolinking target is added as an interface to disable Boost's autolinking feature.
if(Boost_VERSION VERSION_LESS "1.81.0"): This is a conditional judgment, checking whether the Boost version is lower than 1.81.0.
target_compile_definitions(Boost::boost …): This section adds compilation definitions for Boost::boost targets when the conditions are met (Boost version is lower than 1.81.0). BOOST_NO_CXX98_FUNCTION_BASE is defined here, which means that the use of std::unary_function is disabled. This is because std::unary_function was deprecated in C++17 and removed in some compilers' C++20 implementations.
In summary, this code is responsible for setting up and configuring the use of the Boost library in the Krita project.
1. Concrete operation
It is feasible to use MSYS2 and MinGW64 to compile Krita source code and generate header files, static libraries and dynamic link libraries under Windows 10. Here are the steps to compile Krita source code using MSYS2 and MinGW64 under Windows 10:
Install MSYS2: Please visit the official website of MSYS2 (https://www.msys2.org/) to download and install MSYS2.
Open MSYS2, and update the package manager and its installed packages. Run the following command in the MSYS2 terminal:
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pacman -Syu
According to the prompt, after restarting MSYS2, continue to run:
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pacman -Su
install MinGW64 and related tools. Run the following command in the MSYS2 terminal:
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pacman -S mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake mingw-w64-x86_64-boost mingw-w64-x86_64-qt5
Add the MinGW64 binaries to the PATH environment variable. Run the following command in the MSYS2 terminal:
bash
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echo 'export PATH=/mingw64/bin:$PATH' >> ~/.bashrc
source ~/.bashrc
clones the Krita source code. Run the following command in the MSYS2 terminal:
bash
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git clone https://invent.kde.org/graphics/krita.git
cd krita
Create a build directory and change into it:
bash
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mkdir build
cd build
Configure Krita with CMake project. Run the following command in the MSYS2 terminal:
mathematica
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cmake -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release ...
Compile Krita. Run the following command in the MSYS2 terminal:
go
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mingw32-make
After completing the above steps, the Krita source code will be compiled into a header file (.h), a static library (.a) and a dynamic link library (.dll). These files can be found in the build directory (eg: build).
Note that these steps may change with updates to Krita or MSYS2. Please refer to the official Krita documentation or the MSYS2 documentation for the latest compilation guidelines.
2. Use steps
You appear to have encountered a compilation error when building Krita. You can try the following steps to resolve the issue:
Make sure you have the latest dependencies and libraries installed. In this case, the problem seems to be with the "lager" library. Please double check that you have the correct version installed. If not, update the library to the version required by Krita.
Clean the build directory and try building Krita again:
ruby
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$ mingw32-make clean
$ mingw32-make -j $(nproc)
If the error persists, it may be related to the specific version of Krita you are trying to build. You can try switching to a different branch or updating your local repository to the latest version:
ruby
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$ git checkout <branch_name>
$ git pull
Then, try building Krita again.
mingw32-make -j$(nproc) is a command to compile projects using the MinGW build system on Windows. The specific meaning of this command is as follows:
mingw32-make: This is the make tool of the MinGW build system for compiling and building projects on Windows systems. MinGW provides a collection of GNU compilers for Windows, enabling you to use a Linux-like development toolchain on Windows.
-j: This option tells the make tool to execute multiple tasks in parallel during the compilation process. This can significantly reduce build times as it allows you to run multiple compilation tasks concurrently.
$(nproc): This is a shell command that returns the number of logical processors available on the system. In this context, it is used to determine how many parallel tasks the make tool should use. Using $(nproc) as an argument allows the compilation process to take full advantage of your computer's multi-core processing capabilities.
To sum up, the mingw32-make -j$(nproc) command means: use the MinGW build system to compile the project on Windows, and execute multiple tasks in parallel to speed up the build according to the number of logical processors available on your machine.
