Changed cmake so that there is only the dlib target and it isn't forced

to be static or shared, instead, the build type will toggle based on the
state of CMake's BUILD_SHARED_LIBS variable.

dlib/CMakeLists.txt

@@ -195,11 +195,7 @@ if (NOT TARGET dlib)
    set(dlib_needed_includes)
 
    if (DLIB_ISO_CPP_ONLY)
-       add_library(dlib STATIC ${source_files} )
-       if (UNIX AND NOT DLIB_IN_PROJECT_BUILD)
-           add_library(dlib_shared SHARED ${source_files} )
-           add_dependencies(dlib_shared dlib)
-       endif()
+       add_library(dlib ${source_files} )
    else()
 
       set(source_files ${source_files}
@@ -697,18 +693,9 @@ if (NOT TARGET dlib)
          # The old cuda_add_library() command doesn't support CMake's newer dependency
          # stuff, so we have to set the include path manually still, which we do here.
          include_directories(${dlib_needed_includes})
-         cuda_add_library(dlib STATIC ${source_files} )
+         cuda_add_library(dlib ${source_files} )
       else()
-         add_library(dlib STATIC ${source_files} )
-      endif()
-      if (UNIX AND NOT DLIB_IN_PROJECT_BUILD)
-         if (DLIB_USE_CUDA)
-            cuda_add_library(dlib_shared SHARED ${source_files} )
-            add_dependencies(dlib_shared dlib)
-         else()
-            add_library(dlib_shared SHARED ${source_files} )
-            add_dependencies(dlib_shared dlib)
-         endif()
+         add_library(dlib ${source_files} )
       endif()
 
    endif ()  ##### end of if NOT DLIB_ISO_CPP_ONLY ##########################################################
@@ -719,21 +706,12 @@ if (NOT TARGET dlib)
                               INTERFACE $<INSTALL_INTERFACE:include>
                               PUBLIC ${dlib_needed_includes}
                               )
-   target_link_libraries(dlib PRIVATE ${dlib_needed_libraries})
+   target_link_libraries(dlib PUBLIC ${dlib_needed_libraries})
    if (DLIB_IN_PROJECT_BUILD)
       target_compile_options(dlib PUBLIC ${active_preprocessor_switches})
    else()
       target_compile_options(dlib PRIVATE ${active_preprocessor_switches})
    endif()
-   if (UNIX AND NOT DLIB_IN_PROJECT_BUILD)
-      target_include_directories(dlib_shared
-                                 INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/..>
-                                 INTERFACE $<INSTALL_INTERFACE:include>
-                                 PUBLIC ${dlib_needed_includes}
-                                 )
-      target_link_libraries(dlib_shared PUBLIC ${dlib_needed_libraries})
-      target_compile_options(dlib_shared PRIVATE ${active_preprocessor_switches})
-   endif()
 
 
    # Allow the unit tests to ask us to compile the all/source.cpp file just to make sure it compiles.
@@ -748,29 +726,16 @@ if (NOT TARGET dlib)
       enable_cpp11_for_target(dlib)
       target_compile_options(dlib PUBLIC ${active_compile_opts})
    endif()
-   if (TARGET dlib_shared)
-      enable_cpp11_for_target(dlib_shared)
-      target_compile_options(dlib_shared PUBLIC ${active_compile_opts})
-   endif()
 
    # Install the library
    if (NOT DLIB_IN_PROJECT_BUILD)
-       if(UNIX)
-           set_target_properties(dlib_shared PROPERTIES
-                                        OUTPUT_NAME dlib 
+       set_target_properties(dlib PROPERTIES
                                  VERSION ${VERSION})
-           install(TARGETS dlib dlib_shared
-                   EXPORT dlib 
-                   RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} # Windows (including cygwin) considers .dll to be runtime artifacts
-                   LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-                   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-       else()
        install(TARGETS dlib
                EXPORT dlib 
                RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} # Windows considers .dll to be runtime artifacts
                LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
                ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-       endif()
 
        install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dlib
                FILES_MATCHING PATTERN "*.h" PATTERN "*.cmake"