IgnImportTarget does not work correctly with <project>_LIBRARIES variables that contains link-time keyworks

[osrf-migration]

Original report (archived issue) by Silvio Traversaro (Bitbucket: traversaro).

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Prerequisites

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Description

If a variable <project>_LIBRARIES contains a link-type keyword such as optimized or debug (such as `optimized;C:/vcpkg/installed/x64-windows/lib/libcurl.lib;debug;C:/vcpkg/installed/x64-windows/debug/lib/libcurl-d.lib`, see https://cmake.org/cmake/help/latest/command/target_link_libraries.html#overview), the ign_import_target CMake function does not work correctly.

Steps to Reproduce

1. Install curl via vcpkg (that install curl both in Release and in Debug)
2. Configure a CMake project with the following code:

find_package(CURL REQUIRED)
ign_import_target(curl
  LIB_VAR CURL_LIBRARIES
  INCLUDE_VAR CURL_INCLUDE_DIRS)

Expected behavior:

The curl::curl is correctly created without any error.

Actual behavior:

-- Found CURL: optimized;C:/vsts/_work/1/s/installed/arm64-windows/lib/libcurl.lib;debug;C:/vsts/_work/1/s/installed/arm64-windows/debug/lib/libcurl-d.lib (found version "7.65.2-DEV")  
CMake Error at C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/IgnImportTarget.cmake:172 (set_target_properties):
  Property INTERFACE_LINK_LIBRARIES may not contain link-type keyword
  "debug".  The INTERFACE_LINK_LIBRARIES property may contain
  configuration-sensitive generator-expressions which may be used to specify
  per-configuration rules.
Call Stack (most recent call first):
  C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/IgnImportTarget.cmake:100 (_ign_sort_libraries)
  C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/FindIgnCURL.cmake:52 (ign_import_target)
  C:/vsts/_work/1/s/scripts/buildsystems/vcpkg.cmake:256 (_find_package)
  C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/IgnUtils.cmake:146 (find_package)
  CMakeLists.txt:31 (ign_find_package)


CMake Error at C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/IgnImportTarget.cmake:106 (set_target_properties):
  Property INTERFACE_LINK_LIBRARIES may not contain link-type keyword
  "optimized".  The INTERFACE_LINK_LIBRARIES property may contain
  configuration-sensitive generator-expressions which may be used to specify
  per-configuration rules.
Call Stack (most recent call first):
  C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/FindIgnCURL.cmake:52 (ign_import_target)
  C:/vsts/_work/1/s/scripts/buildsystems/vcpkg.cmake:256 (_find_package)
  C:/vsts/_work/1/s/installed/arm64-windows/share/ignition-cmake0/cmake0/IgnUtils.cmake:146 (find_package)
  CMakeLists.txt:31 (ign_find_package)


-- Looking for IgnCURL - found

Reproduces how often:

All the time.

Versions

ignition-cmake0 0.6.1

Additional Information

Problem emerged in microsoft/vcpkg#8136 (comment) .