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Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 6.0.0, 6.1
Component/s: Build System: CMake
Labels:
None
Environment:
cmake 3.19.3

Platform/s:

Linux/X11
Commits:
74f549b4026710b484f17cd99dbafb074854bd11 (qt/qtbase/dev)

when building qtbase static:

/usr/bin/cmake -DFEATURE_developer_build=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=/usr/bin/gcc-10 -DCMAKE_CXX_COMPILER=/usr/bin/g++-10 -G Ninja -DCMAKE_CXX_FLAGS=-Wfatal-errors /home/andreasbuhr/development/qtdev/qtbase 2>&1 | tee buildlog.txt

it fails to build with errors like

FAILED: tests/auto/corelib/io/qprocess/testProcessEcho2/testProcessEcho2 
: && /usr/bin/g++-10 -Wfatal-errors -g -Wl,--gc-sections -Wl,--enable-new-dtags tests/auto/corelib/io/qprocess/testProcessEcho2/CMakeFiles/testProcessEcho2.dir/testProcessEcho2_autogen/mocs_compilation.cpp.o tests/auto/corelib/io/qprocess/testProcessEcho2/CMakeFiles/testProcessEcho2.dir/main.cpp.o -o tests/auto/corelib/io/qprocess/testProcessEcho2/testProcessEcho2  lib/libQt6Core.a  lib/libQt6Core_qobject.a  -lpthread  /usr/lib/x86_64-linux-gnu/libz.so  /usr/lib/x86_64-linux-gnu/libdouble-conversion.so  -lm  /usr/lib/x86_64-linux-gnu/libicui18n.so  /usr/lib/x86_64-linux-gnu/libicuuc.so  /usr/lib/x86_64-linux-gnu/libicudata.so  /usr/lib/x86_64-linux-gnu/libpcre2-16.so  -ldl  /usr/lib/x86_64-linux-gnu/libglib-2.0.so  /usr/lib/x86_64-linux-gnu/libgthread-2.0.so  /usr/lib/x86_64-linux-gnu/librt.so  src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o && :
/usr/bin/ld: src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o: in function `qResourceFeatureZlib()':
/home/andreasbuhr/development/qtdev/qtbase-staticbuild/src/corelib/.rcc/qrc_mimetypes.cpp:21203: undefined reference to `qt_resourceFeatureZlib'
/usr/bin/ld: src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o: in function `qInitResources_mimetypes()':
/home/andreasbuhr/development/qtdev/qtbase-staticbuild/src/corelib/.rcc/qrc_mimetypes.cpp:21218: undefined reference to `qRegisterResourceData(int, unsigned char const*, unsigned char const*, unsigned char const*)'
/usr/bin/ld: src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o: in function `qCleanupResources_mimetypes()':
/home/andreasbuhr/development/qtdev/qtbase-staticbuild/src/corelib/.rcc/qrc_mimetypes.cpp:21228: undefined reference to `qUnregisterResourceData(int, unsigned char const*, unsigned char const*, unsigned char const*)'
collect2: error: ld returned 1 exit status

The reason is that the order in the linker command line is wrong:

On the command line,

src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o

appears after

lib/libQt6Core.a

. This cannot work, as qrc_mimetypes relies on libQt6Core.a. Changing the linker command line manually from

/usr/bin/g++-10 -Wfatal-errors -g -Wl,--gc-sections -Wl,--enable-new-dtags tests/auto/corelib/io/qprocess/testProcessEcho2/CMakeFiles/testProcessEcho2.dir/testProcessEcho2_autogen/mocs_compilation.cpp.o tests/auto/corelib/io/qprocess/testProcessEcho2/CMakeFiles/testProcessEcho2.dir/main.cpp.o -o tests/auto/corelib/io/qprocess/testProcessEcho2/testProcessEcho2  lib/libQt6Core.a  lib/libQt6Core_qobject.a  -lpthread  /usr/lib/x86_64-linux-gnu/libz.so  /usr/lib/x86_64-linux-gnu/libdouble-conversion.so  -lm  /usr/lib/x86_64-linux-gnu/libicui18n.so  /usr/lib/x86_64-linux-gnu/libicuuc.so  /usr/lib/x86_64-linux-gnu/libicudata.so  /usr/lib/x86_64-linux-gnu/libpcre2-16.so  -ldl  /usr/lib/x86_64-linux-gnu/libglib-2.0.so  /usr/lib/x86_64-linux-gnu/libgthread-2.0.so  /usr/lib/x86_64-linux-gnu/librt.so  src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o

/usr/bin/g++-10 -Wfatal-errors -g -Wl,--gc-sections -Wl,--enable-new-dtags tests/auto/corelib/io/qprocess/testProcessEcho2/CMakeFiles/testProcessEcho2.dir/testProcessEcho2_autogen/mocs_compilation.cpp.o tests/auto/corelib/io/qprocess/testProcessEcho2/CMakeFiles/testProcessEcho2.dir/main.cpp.o -o tests/auto/corelib/io/qprocess/testProcessEcho2/testProcessEcho2 src/corelib/CMakeFiles/Core_resources_1.dir/./.rcc/qrc_mimetypes.cpp.o lib/libQt6Core.a  lib/libQt6Core_qobject.a  -lpthread  /usr/lib/x86_64-linux-gnu/libz.so  /usr/lib/x86_64-linux-gnu/libdouble-conversion.so  -lm  /usr/lib/x86_64-linux-gnu/libicui18n.so  /usr/lib/x86_64-linux-gnu/libicuuc.so  /usr/lib/x86_64-linux-gnu/libicudata.so  /usr/lib/x86_64-linux-gnu/libpcre2-16.so  -ldl  /usr/lib/x86_64-linux-gnu/libglib-2.0.so  /usr/lib/x86_64-linux-gnu/libgthread-2.0.so  /usr/lib/x86_64-linux-gnu/librt.so

solves the problem. But one cannot fix each linker command manually.