cmake "file RELATIVE_PATH must be passed a full path to the directory" error

[armaho]

I tried compiling ros2_rolling from source based on the official tutorial, but I got this error:

CMake Error at CMakeLists.txt:39 (file):
  file RELATIVE_PATH must be passed a full path to the directory:
  lib/urdfdom_headers/cmake

CMake Error at CMakeLists.txt:40 (file):
  file RELATIVE_PATH must be passed a full path to the directory: lib

I was able to compile this project before, and I think that the issue is related to pull request #90. I not completely sure if this happens only on my machine or not. here are the value for related variables:

CMAKE_CONFIG_INSTALL_DIR = lib/urdfdom_headers/cmake
CMAKE_INSTALL_LIBDIR = lib
CMAKE_INSTALL_PREFIX = /home/arman/ros2_rolling/install/urdfdom_headers

[armaho]

I think the problem was with the assumption that CMAKE_INSTALL_LIBDIR is absolute. I was able to resolve this by changing the following piece of code in cmake:

if(WIN32 AND NOT CYGWIN)
  set(CMAKE_CONFIG_INSTALL_DIR CMake)
else()
  set(CMAKE_CONFIG_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake)
endif()

to:

if(WIN32 AND NOT CYGWIN)
  set(CMAKE_CONFIG_INSTALL_DIR CMake)
else()
  if(NOT IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
    set(CMAKE_INSTALL_LIBDIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
  endif()
  set(CMAKE_CONFIG_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake)
endif()

I'm not sure if this is the right solution though.

[armaho]

Based on this, it's not recommended to concatenate CMAKE_INSTALL_<dir> to CMAKE_INSTALL_PREFIX manually. So i think the following solution would be better:

if(WIN32 AND NOT CYGWIN)
  set(CMAKE_CONFIG_INSTALL_DIR CMake)
else()
  set(CMAKE_CONFIG_INSTALL_DIR ${CMAKE_INSTALL_FULL_LIBDIR}/${PROJECT_NAME}/cmake)
endif()
file(RELATIVE_PATH RELATIVE_PATH_CMAKE_DIR_TO_PREFIX "${CMAKE_CONFIG_INSTALL_DIR}" "${CMAKE_INSTALL_PREFIX}")
file(RELATIVE_PATH RELATIVE_PATH_LIBDIR_TO_PREFIX "${CMAKE_INSTALL_FULL_LIBDIR}" "${CMAKE_INSTALL_PREFIX}")

[rhaschke]

I'm running into the same issue:

-- urdfdom_headers version 2.1.0
CMake Error at CMakeLists.txt:39 (file):
  file RELATIVE_PATH must be passed a full path to the directory:
  lib/x86_64-linux-gnu/urdfdom_headers/cmake

CMake Error at CMakeLists.txt:40 (file):
  file RELATIVE_PATH must be passed a full path to the directory:
  lib/x86_64-linux-gnu

I think these two lines should only be applied if the path variables actually are absolute:

urdfdom_headers/CMakeLists.txt

Lines 39 to 40 in 3a1ae72

	file(RELATIVE_PATH RELATIVE_PATH_CMAKE_DIR_TO_PREFIX "${CMAKE_CONFIG_INSTALL_DIR}" "${CMAKE_INSTALL_PREFIX}")
	file(RELATIVE_PATH RELATIVE_PATH_LIBDIR_TO_PREFIX "${CMAKE_INSTALL_LIBDIR}" "${CMAKE_INSTALL_PREFIX}")