Build errors when cross compiling
Opened this issue · 1 comments
Describe the bug
Following the steps at https://github.com/semlanik/qtprotobuf#cross-compiling I cannot build the target host version of qtprotobuf.
There are multiple CMake errors:
- QtProtobuf not found
CMake Error at CMakeLists.txt:33 (find_package):
Could not find a package configuration file provided by "QtProtobuf" with
any of the following names:
QtProtobufConfig.cmake
Even though I am providing -DQT_PROTOBUF_HOST_PATH=/usr/local/qtprotobuf-qt5/lib/cmake.
I can workaround this with -DQtProtobuf_DIR=/usr/local/qtprotobuf-qt5/lib/cmake/QtProtobuf/
- Qt5 not found
CMake Error at CMakeLists.txt:39 (find_package):
Could not find a package configuration file provided by "Qt5" with any of
the following names:
Qt5Config.cmake
qt5-config.cmake
Add the installation prefix of "Qt5" to CMAKE_PREFIX_PATH or set "Qt5_DIR"
to a directory containing one of the above files. If "Qt5" provides a
separate development package or SDK, be sure it has been installed.
Even though I am providing -DCMAKE_PREFIX_PATH=/opt/Qt5/5.15.2/android/
I can work around it with -DQt5_DIR=/opt/Qt5/5.15.2/android/lib/cmake/Qt5/
- Qt5Core, Qt5Qml, Qt5Network not found
With a similar error to above, also workaroundable via _DIR variable.
And the blocking protoc exec format error for me. This is the one I cannot workaround:
/bin/sh: 1: /home/user/qtprotobuf/build-android-qt5/3rdparty/grpc/third_party/protobuf/protoc-3.14.0.0: Exec format error
It seems like it is using the protoc from the target system (android) instead of the one provided from the host.
To Reproduce
Replicate the Cross-Compiling section of the manual.
I am using the following cmake command for host:
cmake .. -DCMAKE_INSTALL_PREFIX=/usr/local/qtprotobuf-qt5 -DQT_PROTOBUF_MAKE_TESTS=false -DQT_PROTOBUF_MAKE_EXAMPLES=false
cmake ../ -DCMAKE_INSTALL_PREFIX=/usr/local/qtprotobuf-qt5-android -DQT_PROTOBUF_MAKE_TESTS=OFF -DQT_PROTOBUF_MAKE_EXAMPLES=OFF -DCMAKE_TOOLCHAIN_FILE:FILEPATH=/home/user/Android/Sdk/ndk/22.1.7171670/build/cmake/android.toolchain.cmake -DQT_PROTOBUF_HOST_PATH=/usr/local/qtprotobuf-qt5/lib/cmake -DCMAKE_PREFIX_PATH=/opt/Qt5/5.15.2/android/
The additional flags I need to pass to get the protoc error are:
-DQtProtobuf_DIR=//usr/local/qtprotobuf-qt5/lib/cmake/QtProtobuf/ -DQt5_DIR=/opt/Qt5/5.15.2/android/lib/cmake/Qt5/ -DQt5Core_DIR=/opt/Qt5/5.15.2/android/lib/cmake/Qt5Core/ -DQt5Qml_DIR=/opt/Qt5/5.15.2/android/lib/cmake/Qt5Qml/ -DQt5Network_DIR=/opt/Qt5/5.15.2/android/lib/cmake/Qt5Network/
Expected behavior
Environment:
- OS: Ubuntu 20.04
- Version master (7e6b149)
Additional context
I am not sure if it's a typo or is intended (I've tried both). But on the Cross Compiling manual, the build the target QtProtobuf section is executed on the same build dir as the host version
mkdir build-host
cd build-host
I am also trying Qt6 with this patch #249 (comment) and I get to the same blocking point.