CMake transitive LINK_LIBRARIES

.gitignore

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+.cache
+build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.12...4.1)
+project(link-libraries)
+
+# Added in 4.1, enables transitive link libraries on LINK_LIBRARIES property
+# https://cmake.org/cmake/help/v4.1/policy/CMP0189.html
+# https://gitlab.kitware.com/cmake/cmake/-/issues/26709
+# https://gitlab.kitware.com/cmake/cmake/-/merge_requests/10391
+cmake_policy(SET CMP0189 NEW)
+
+add_library(shared1 SHARED dummy.cpp)
+add_library(shared2 SHARED dummy.cpp)
+add_library(shared3 SHARED dummy.cpp)
+add_library(interface1 INTERFACE)
+add_library(interface2 INTERFACE)
+add_library(interface3 INTERFACE)
+add_library(interface4 INTERFACE)
+add_library(static1 STATIC dummy.cpp)
+add_library(static2 STATIC dummy.cpp)
+
+add_library(lib1 STATIC dummy.cpp)
+target_link_libraries(
+  lib1
+  PUBLIC shared1 interface1 static1
+  PRIVATE shared2 interface2 static2
+  INTERFACE interface3)
+
+add_library(lib2 SHARED dummy.cpp)
+target_link_libraries(lib2 shared3 interface3)
+
+add_executable(exe1 dummy.cpp)
+target_link_libraries(exe1 PRIVATE lib1 lib2 interface4)
+
+add_executable(exe2 dummy.cpp)
+target_link_libraries(exe2 lib1 lib2 interface4)
+
+get_target_property(lib1_LINK_LIBRARIES lib1 LINK_LIBRARIES)
+get_target_property(lib1_INTERFACE_LINK_LIBRARIES lib1 INTERFACE_LINK_LIBRARIES)
+message(STATUS "lib1_LINK_LIBRARIES: ${lib1_LINK_LIBRARIES}")
+message(STATUS "lib1_INTERFACE_LINK: ${lib1_INTERFACE_LINK_LIBRARIES}")
+
+get_target_property(exe1_LINK_LIBRARIES exe1 LINK_LIBRARIES)
+get_target_property(exe1_INTERFACE_LINK_LIBRARIES exe1 INTERFACE_LINK_LIBRARIES)
+message(STATUS "exe1_LINK_LIBRARIES: ${exe1_LINK_LIBRARIES}")
+message(STATUS "exe1_INTERFACE_LINK: ${exe1_INTERFACE_LINK_LIBRARIES}")
+
+get_target_property(exe2_LINK_LIBRARIES exe2 LINK_LIBRARIES)
+get_target_property(exe2_INTERFACE_LINK_LIBRARIES exe1 INTERFACE_LINK_LIBRARIES)
+message(STATUS "exe2_LINK_LIBRARIES: ${exe2_LINK_LIBRARIES}")
+message(STATUS "exe2_INTERFACE_LINK: ${exe2_INTERFACE_LINK_LIBRARIES}")
+
+# https://stackoverflow.com/questions/51353110/how-do-i-output-the-result-of-a-generator-expression-in-cmake
+file(
+  GENERATE
+  OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/lib1_link_libraries.txt
+  CONTENT "$<TARGET_PROPERTY:lib1,LINK_LIBRARIES>")
+file(
+  GENERATE
+  OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/exe1_link_libraries.txt
+  CONTENT "$<TARGET_PROPERTY:exe1,LINK_LIBRARIES>")
+file(
+  GENERATE
+  OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/exe2_link_libraries.txt
+  CONTENT "$<TARGET_PROPERTY:exe2,LINK_LIBRARIES>")
+
+# set_property(GLOBAL PROPERTY GLOBAL_DEPENDS_DEBUG_MODE 1)

README.md

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+# CMake transitive LINK_LIBRARIES
+
+Small test to check if the target property LINK_LIBRARIES was transitive. It seems it was only added
+as the result of the generator expression $<TARGET_PROPERTY:tgt,LINK_LIBRARIES> in CMake 4.1.

exe1_link_libraries.txt

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+lib1;lib2;interface4;shared1;interface1;static1;shared2;interface2;static2;interface3;shared3;interface3

exe2_link_libraries.txt

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+lib1;lib2;interface4;shared1;interface1;static1;shared2;interface2;static2;interface3;shared3;interface3

lib1_link_libraries.txt

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+shared1;interface1;static1;shared2;interface2;static2