2.0 KiB
pkg-config
MIQT always uses pkg-config to find C++ libraries to bind to.
For Qt Widgets, the .pc definition is supplied along with Qt, but for other third-party libraries, definitions might not be present. To use such third-party libraries, one option is to set the CGO_CFLAGS, CGO_CXXFLAGS, CGO_LDFLAGS environment variables for go build. However, this has a global effect and may cause issues if you use multiple libraries. Therefore, another option is to create a pkg-config file.
To specify the CFLAGS/CXXFLAGS and LDFLAGS for a specific library, make a MyLibrary.pc file as follows:
Name: My Library
Requires: Qt6Widgets
Libs: -lfoo
Cflags: -I/path/
Then run PKG_CONFIG_PATH=/path/to/dir/ go build so CGO will find your library. Then, the necessary flags for your system will be used only as required for the specific package.
The PKG_CONFIG_PATH environment variable is understood both by CGO and by genbindings.
When running genbindings in the docker/genbindings container, custom pkg-config files are created inline in the Dockerfile.
Further reading
# Find where pkg-config looks for system libraries
$ pkg-config --variable pc_path pkg-config
/usr/local/lib/x86_64-linux-gnu/pkgconfig:/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig
List all available packages known to pkg-config:
pkg-config --list-all
A full example for QScintilla (Qt 5) from the genbindings.Dockerfile:
includedir=/usr/include/x86_64-linux-gnu/qt5/Qsci/
Name: QScintilla
Description: Qt5 port of the Scintilla source code editing widget
URL: http://www.riverbankcomputing.co.uk/software/qscintilla
Version: 2.13.3
Requires: Qt5Widgets, Qt5PrintSupport
Libs: -lqscintilla2_qt5
Cflags: -I${includedir}