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BLD: Add CMake option to build Python bindings without rebuilding libz3 (redux) (#8088)

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* Add CMake option to build only Python bindings without rebuilding libz3

Introduce Z3_BUILD_LIBZ3_CORE option (default ON) to control whether libz3 is built.
When set to OFF with Z3_BUILD_PYTHON_BINDINGS=ON, only Python bindings are built
using a pre-installed libz3 library. This is useful for package managers like
conda-forge to avoid rebuilding libz3 for each Python version.

Changes:
- Add Z3_BUILD_LIBZ3_CORE option in src/CMakeLists.txt
- When OFF, find and use pre-installed libz3 as imported target
- Update Python bindings CMakeLists.txt to handle both built and imported libz3
- Add documentation in README-CMake.md with usage examples

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Fix CMake export issues when building only Python bindings

Conditionally export Z3_EXPORTED_TARGETS only when Z3_BUILD_LIBZ3_CORE=ON
to avoid errors when building Python bindings without building libz3.

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Disable executable and test builds when not building libz3 core

When Z3_BUILD_LIBZ3_CORE=OFF, automatically disable Z3_BUILD_EXECUTABLE
and Z3_BUILD_TEST_EXECUTABLES to avoid build/install errors.

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* only build src/ folder if Z3_BUILD_LIBZ3_CORE is TRUE

* move z3 python bindings to main CMake

* move more logic to main CMakeLists.txt

* move Z3_API_HEADER_FILES_TO_SCAN to main CMakeLists.txt

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
This commit is contained in:
h-vetinari 2025-12-17 04:50:37 +11:00 • committed by GitHub
parent 9f7e304ee8
commit 429771e5b7
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GPG key ID: B5690EEEBB952194
4 changed files with 162 additions and 63 deletions
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33
src/api/python/CMakeLists.txt
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@ -70,13 +70,32 @@ else()
endif()
# Link libz3 into the python directory so bindings work out of the box
add_custom_command(OUTPUT "${z3py_bindings_build_dest}/libz3${CMAKE_SHARED_MODULE_SUFFIX}"
COMMAND "${CMAKE_COMMAND}" "-E" "${LINK_COMMAND}"
"${PROJECT_BINARY_DIR}/libz3${CMAKE_SHARED_MODULE_SUFFIX}"
"${z3py_bindings_build_dest}/libz3${CMAKE_SHARED_MODULE_SUFFIX}"
DEPENDS libz3
COMMENT "Linking libz3 into python directory"
)
# Handle both built libz3 and pre-installed libz3
if (TARGET libz3)
# Get the libz3 location - handle both regular and imported targets
get_target_property(LIBZ3_IS_IMPORTED libz3 IMPORTED)
if (LIBZ3_IS_IMPORTED)
# For imported targets, get the IMPORTED_LOCATION
get_target_property(LIBZ3_SOURCE_PATH libz3 IMPORTED_LOCATION)
# No dependency on libz3 target since it's pre-built
set(LIBZ3_DEPENDS "")
else()
# For regular targets, use the build output location
set(LIBZ3_SOURCE_PATH "${PROJECT_BINARY_DIR}/libz3${CMAKE_SHARED_MODULE_SUFFIX}")
set(LIBZ3_DEPENDS libz3)
endif()
add_custom_command(OUTPUT "${z3py_bindings_build_dest}/libz3${CMAKE_SHARED_MODULE_SUFFIX}"
COMMAND "${CMAKE_COMMAND}" "-E" "${LINK_COMMAND}"
"${LIBZ3_SOURCE_PATH}"
"${z3py_bindings_build_dest}/libz3${CMAKE_SHARED_MODULE_SUFFIX}"
DEPENDS ${LIBZ3_DEPENDS}
COMMENT "Linking libz3 into python directory"
)
else()
message(FATAL_ERROR "libz3 target not found. Cannot build Python bindings.")
endif()
# Convenient top-level target
add_custom_target(build_z3_python_bindings