Fix transitive dependencies. Fixes #78

Author: Max Krogius

CMake/apriltagConfig.cmake

@@ -0,0 +1,7 @@
+include("${CMAKE_CURRENT_LIST_DIR}/apriltagTargets.cmake")
+
+if (NOT MSVC) 
+    include(CMakeFindDependencyMacro)
+    find_dependency(Threads)
+endif()
+

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.10)
 project(apriltag)
 
 find_package(OpenCV QUIET)
@@ -20,7 +20,7 @@ if (MSVC)
     target_link_libraries(${PROJECT_NAME} ${PTHREAD_LIBRARIES} winmm)
 else()
     find_package(Threads REQUIRED)
-    target_link_libraries(${PROJECT_NAME} Threads::Threads m)
+    target_link_libraries(${PROJECT_NAME} PUBLIC Threads::Threads m)
 endif()
 
 set_target_properties(${PROJECT_NAME} PROPERTIES SOVERSION 3 VERSION 3.1.0)
@@ -38,7 +38,7 @@ set_target_properties(${PROJECT_NAME} PROPERTIES
 
 
 # install library
-install(TARGETS ${PROJECT_NAME} EXPORT apriltag
+install(TARGETS ${PROJECT_NAME} EXPORT apriltagTargets
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 )
@@ -51,10 +51,15 @@ foreach(HEADER ${HEADER_FILES})
 endforeach()
 
 # export library
-install(EXPORT apriltag
+install(EXPORT apriltagTargets
+    FILE apriltagTargets.cmake
+    NAMESPACE apriltag::
     DESTINATION share/apriltag/cmake
-    FILE apriltagConfig.cmake
 )
+install(FILES CMake/apriltagConfig.cmake DESTINATION share/apriltag/cmake)
+export(TARGETS apriltag
+    NAMESPACE apriltag::
+    FILE apriltagTargets.cmake)
 
 FILE(READ apriltag.pc.in PKGC)
 STRING(REGEX REPLACE "^prefix=" "prefix=${CMAKE_INSTALL_PREFIX}" PKGC_CONF "${PKGC}" )