Add sometimes needed Eigen link

Author: julien-michot

CMakeLists.txt

@@ -26,4 +26,5 @@ endif()
 
 # Header-only library
 add_executable(example src/example.cpp)
-target_link_libraries(example PUBLIC tinyopt)
+target_link_libraries(example INTERFACE tinyopt)
+target_link_libraries(example PUBLIC Eigen3::Eigen)

README.md

@@ -12,7 +12,8 @@ set(CMAKE_CXX_STANDARD 20) # Minimum is c++17
 find_package(Tinyopt)
 
 add_executable(example src/example.cpp)
-target_link_libraries(example PUBLIC tinyopt)
+target_link_libraries(example INTERFACE tinyopt)
+target_link_libraries(example PUBLIC Eigen3::Eigen) # needed, sometimes...
 ```
 
 ### Alternative using `git submodule`