cross compile QT6 configure -> packages not found
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I'm on a native bullseye machine
building QT6.2 from git using the comiler and cross-compiler that comes packaged in bullseyefirst I build QT for the host using
jgnoss@mav-dev:~/Devel/QT/qt_x86_64_build$ ../qt_git/configure -prefix /home/jgnoss/Devel/QT/qt_x86_64/6.2.0
configure, build and install worked fine
for cross-compile, I sshfs'd the targets rootfs to:
/home/jgnoss/Devel/bbb/sysroot
made a toolchain-file for cmakecmake_minimum_required(VERSION 3.18) include_guard(GLOBAL) set(CMAKE_SYSTEM_NAME Linux) set(CMAKE_SYSTEM_PROCESSOR arm) set(TARGET_SYSROOT /home/jgnoss/Devel/bbb/sysroot) set(CROSS_COMPILER /usr/arm-linux-gnueabihf) set(CMAKE_SYSROOT ${TARGET_SYSROOT}) set(ENV{PKG_CONFIG_PATH} "") set(ENV{PKG_CONFIG_LIBDIR} ${CMAKE_SYSROOT}/usr/lib/pkgconfig:${CMAKE_SYSROOT}/usr/share/pkgconfig) set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT}) set(CMAKE_C_COMPILER /usr/bin/arm-linux-gnueabihf-gcc-10) set(CMAKE_CXX_COMPILER /usr/bin/arm-linux-gnueabihf-g++-10) # set(QT_COMPILER_FLAGS "-march=armv7-a -mfpu=neon -mfloat-abi=hard") # set(QT_COMPILER_FLAGS "-march=armv7-a -mtune=cortex-a9 -mfpu=neon") #set(QT_COMPILER_FLAGS "-march=armv7-a -mfpu=neon") set(QT_COMPILER_FLAGS_RELEASE "-O2 -pipe") set(QT_LINKER_FLAGS "-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed") set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY) include(CMakeInitializeConfigs) function(cmake_initialize_per_config_variable _PREFIX _DOCSTRING) if (_PREFIX MATCHES "CMAKE_(C|CXX|ASM)_FLAGS") set(CMAKE_${CMAKE_MATCH_1}_FLAGS_INIT "${QT_COMPILER_FLAGS}") foreach (config DEBUG RELEASE MINSIZEREL RELWITHDEBINFO) if (DEFINED QT_COMPILER_FLAGS_${config}) set(CMAKE_${CMAKE_MATCH_1}_FLAGS_${config}_INIT "${QT_COMPILER_FLAGS_${config}}") endif() endforeach() endif() if (_PREFIX MATCHES "CMAKE_(SHARED|MODULE|EXE)_LINKER_FLAGS") foreach (config SHARED MODULE EXE) set(CMAKE_${config}_LINKER_FLAGS_INIT "${QT_LINKER_FLAGS}") endforeach() endif() _cmake_initialize_per_config_variable(${ARGV}) endfunction()
now in another directory y try to cross-compile for arm using
jgnoss@mav-dev:~/Devel/QT/qt_bbb_build$ ../qt_git/configure -sysroot /home/jgnoss/Devel/bbb/sysroot -qt-host-path /home/jgnoss/Devel/QT/qt_x86_64/6.2.0 -prefix /home/jgnoss/Devel/QT/qt_bbb -extprefix /home/jgnoss/Devel/QT/qt_bbb -DQT_BUILD_TOOLS_WHEN_CROSSCOMPILING=ON -- -DCMAKE_TOOLCHAIN_FILE=/home/jgnoss/Devel/QT/toolchain-cross_armhf.cmake
configure runs fine, but misses to detect packages/libraries that are installed on the target
for example:
output from configure-- Checking for module 'libudev' -- No package 'libudev' found
running on target
jgnoss@beaglebone:~$ dpkg -l |grep libudev ii libgudev-1.0-0:armhf 232-2 armhf G Object-based wrapper library for libudev ii libudev-dev:armhf 241-7~deb10u8 armhf l ibudev development files ii libudev1:armhf 241-7~deb10u8 armhf l ibudev shared library jgnoss@beaglebone:~$ pkg-config --libs libudev -ludev
that's just one example, there are a lot of packages/libraries that are not detected
any ideas how to solve that?
thanks
Ju -
Hi,
Did you install the dev packages of the dependencies on your target ?
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AFAIK, cmake writes logs of its process. You should parse them.
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OK, found the quirk.
Digging into configure logfiles it seemed configure isn't using pkg-config or at least not the right way.
So I added -pkg-config to my configure options, but still no libraries/packages found.
A closer look at pkg-config docs and cross compile options I came to conclusion that there is something wrong with where pck-config is looking for the .pc files.
QT's example cmake language file at this page set some values for pkg-config that seems to be right, but it came out that it somehow conflicts with what configure internally does.
Commenting out that following lines solved the problem and all libraries/packages where found.
# set(ENV{PKG_CONFIG_PATH} "") # set(ENV{PKG_CONFIG_LIBDIR} ${CMAKE_SYSROOT}/usr/lib/pkgconfig:${CMAKE_SYSROOT}/usr/share/pkgconfig) # set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})