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Type: Bug
Resolution: Fixed
Priority: P3: Somewhat important
Fix Version/s: 6.1.1, 6.2.0
Affects Version/s: 5.14.0, 6.0.3
Component/s: Build System: CMake
Labels:
- Reported_by_support_standard

with 5.14 statically linked plugins pull in Import.cpp files into every downstream target. these downstream targets can be static intermediate libraries or final targets (executables or loadable modules)

in my use case i'm having dozens of intermediate targets, each will compile their own copy of the Import.cpp files, which slows down the build process quite a bit.

one could avoid excessive compilation by using object libraries in a pattern like this:

add_library(FooPluginImporter OBJECT FooPlugin_Import.cpp)
add_library(FooPlugin [...])
target_sources(FooPlugin INTERFACE $<TARGET_OBJECTS:FooPluginImporter>)

this will cause the Import.cpp file to be compiled only once, but the object file will be linked into every target downstream of FooPlugin

relates to

QTBUG-93257 qt6_import_qml_plugins does not compose

Closed

QTBUG-92933 Rework automatic static plugin linkage

Closed

QTBUG-97816 Prevent linker from discarding unused shared libraries

Reported

QTBUG-91448 Undefined resource symbols when linking app with a static Qt without qmake and CMake

Closed

QTBUG-110243 Resources are lost when linking static libraries using CMake build system in a separate project

Closed

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For Gerrit Dashboard: QTBUG-80863
#	Subject	Branch	Project	Status	CR	V
297705,1	CMake: Avoid repeated compilation of XXX_Import.cpp sources	5.15	qt/qtbase	Status: ABANDONED	0	0
346468,39	CMake: Introduce finalizer mode handling of static plugins	dev	qt/qtbase	Status: MERGED	-1	0
349028,3	CMake: Don't do plugin initialization for static libraries	dev	qt/qtbase	Status: MERGED	+2	0
349039,5	CMake: Build plugin initializers as object libs	dev	qt/qtbase	Status: MERGED	+2	0
349567,3	CMake: Don't do plugin initialization for static libraries	6.1	qt/qtbase	Status: MERGED	+2	0
351144,2	CMake: Revise plugin finalizer mode usage	dev	qt/qtbase	Status: MERGED	+2	0
365948,5	CMake: Create plugin initializers for static user plugins	dev	qt/qtbase	Status: MERGED	+2	0
366641,2	CMake: Create plugin initializers for static user plugins	6.2	qt/qtbase	Status: MERGED	+2	0