[22340] Error evaluating generator expression

[burak-yildizoz]

Is there an already existing issue for this?

• I have searched the existing issues

Expected behavior

CMake generate step should not fail.

Current behavior

CMake fails with the following error message.

CMake Error at CMakeLists.txt (target_link_libraries):
  Error evaluating generator expression:

    $<TARGET_PROPERTY:fastrtps,TYPE>

  Target "fastrtps" not found.


CMake Error at CMakeLists.txt (target_link_libraries):
  Error evaluating generator expression:

    $<TARGET_PROPERTY:fastcdr,TYPE>

  Target "fastcdr" not found.

Steps to reproduce

subdirectory/CMakeLists.txt:

find_package(fastcdr REQUIRED)
find_package(fastrtps REQUIRED)

add_library(my_lib STATIC "source.cpp")
target_link_libraries(my_lib PUBLIC fastcdr fastrtps)

CMakeLists.txt:

add_subdirectory(subdirectory)

add_executable(my_exe "main.cpp")
target_link_libraries(my_exe my_lib)

The issue is resolved if the following lines are added to CMakeLists.txt.

find_package(fastcdr QUIET)
find_package(fastrtps QUIET)

Fast DDS version/commit

2.14.2

Platform/Architecture

Windows 10 Visual Studio 2019

Transport layer

Default configuration, UDPv4 & SHM

Additional context

The problem is most likely caused by the following line at src/cpp/CMakeLists.txt files.

target_compile_definitions(${PROJECT_NAME}
    PRIVATE
    ${PROJECT_NAME_UPPER}_SOURCE
    INTERFACE
    $<$<BOOL:${WIN32}>:${PROJECT_NAME_UPPER}_NO_LIB>
    PUBLIC
    $<$<STREQUAL:$<TARGET_PROPERTY:${PROJECT_NAME},TYPE>,SHARED_LIBRARY>:${PROJECT_NAME_UPPER}_DYN_LINK>
    )

The generated line in fastcdr-static-targets.cmake is as follows.

set_target_properties(fastcdr PROPERTIES
  INTERFACE_COMPILE_DEFINITIONS "\$<\$<BOOL:1>FASTCDR_NO_LIB>;\$<\$<STREQUAL:\$<TARGET_PROPERTY:fastcdr,TYPE>,SHARED_LIBRARY>:FASTCDR_DYN_LINK>"
  INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
)

Consequently, the problem described in CMake: set_target_properties fails with target defined by generator expression occurs.

XML configuration file

No response

Relevant log output

No response

Network traffic capture

No response

[Mario-DL]

Hi @burak-yildizoz,

Thanks for the report ! I could reproduce the issue, we will work on that and come back when we address it.