Push all include and link options needed for dlib to pkg-config. We do this...

Push all include and link options needed for dlib to pkg-config.  We do this by getting them from the same list cmake uses.

dlib/CMakeLists.txt

@@ -373,7 +373,7 @@ if (NOT TARGET dlib)
             endif()
          endif()
 
-         mark_as_advanced(pthreadlib xlib xlib_path x11_path)
+         mark_as_advanced(xlib xlib_path x11_path)
       else () ##################################################################################
          # link to the nsl library if it exists.  this is something you need sometimes 
          find_library(nsllib nsl)
@@ -403,7 +403,7 @@ if (NOT TARGET dlib)
             endif()
          endif()
 
-         mark_as_advanced(nsllib pthreadlib socketlib)
+         mark_as_advanced(nsllib socketlib)
       endif () ##################################################################################
 
       if (NOT DLIB_NO_GUI_SUPPORT)
@@ -437,7 +437,6 @@ if (NOT TARGET dlib)
          if (PNG_FOUND)
             include_directories(${PNG_INCLUDE_DIR})
             set (dlib_needed_libraries ${dlib_needed_libraries} ${PNG_LIBRARIES})
-            set(REQUIRES_LIBS " libpng")
          else()
             # If we can't find libpng then statically compile it in.
             include_directories(external/libpng external/zlib)
@@ -487,7 +486,6 @@ if (NOT TARGET dlib)
                   )
                set_source_files_properties(external/libpng/arm/filter_neon.S PROPERTIES COMPILE_FLAGS "${CMAKE_ASM_FLAGS} ${CMAKE_CXX_FLAGS} -x assembler-with-cpp")
             endif()
-            set(REQUIRES_LIBS "")
          endif()
          set(source_files ${source_files}
             image_loader/png_loader.cpp
@@ -756,6 +754,7 @@ if (NOT TARGET dlib)
                ${cudnn}
                ${CUDA_curand_LIBRARY}
                ${CUDA_cusolver_LIBRARY}
+               ${CUDA_CUDART_LIBRARY}
                )
             if(openmp_libraries)
                list(APPEND dlib_needed_libraries ${openmp_libraries})
@@ -867,6 +866,11 @@ if (NOT TARGET dlib)
 
    # Install the library
    if (NOT DLIB_IN_PROJECT_BUILD)
+      string (REPLACE ";" " " pkg_config_dlib_needed_libraries "${dlib_needed_libraries}")
+      # Make the -I include options for pkg-config
+      foreach (ITR ${dlib_needed_includes})
+         set (pkg_config_dlib_needed_includes "${pkg_config_dlib_needed_includes} -I${ITR}")
+      endforeach()
       set_target_properties(dlib PROPERTIES
          VERSION ${VERSION})
       install(TARGETS dlib

dlib/cmake_utils/dlib.pc.in

@@ -4,6 +4,5 @@ includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
 Name: @PROJECT_NAME@
 Description: Numerical and networking C++ library
 Version: @VERSION@
-Libs: -L${libdir} -ldlib
-Cflags: -I${includedir}
-Requires:@REQUIRES_LIBS@
+Libs: -L${libdir} -ldlib @pkg_config_dlib_needed_libraries@
+Cflags: -I${includedir} @pkg_config_dlib_needed_includes@