Add public header path to target interface

Closes #697.

docs/build.dox

@@ -159,20 +159,14 @@ add_subdirectory(path/to/glfw)
 @endcode
 
 Once GLFW has been added to the project, link against it with the `glfw` target.
-This adds all link-time dependencies of GLFW as it is currently configured and,
-when applicable, the [GLFW_DLL](@ref build_macros) macro.
+This adds all link-time dependencies of GLFW as it is currently configured,
+the include directory for the GLFW header and, when applicable, the
+[GLFW_DLL](@ref build_macros) macro.
 
 @code{.cmake}
 target_link_libraries(myapp glfw)
 @endcode
 
-To be able to include the GLFW header from your code, you need to tell the
-compiler where to find it.
-
-@code{.cmake}
-include_directories(path/to/glfw/include)
-@endcode
-
 Note that it does not include GLU, as GLFW does not use it.  If your application
 needs GLU, you can find it by requiring the OpenGL package.
 

examples/CMakeLists.txt

@@ -9,8 +9,7 @@ if (MSVC)
     add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 endif()
 
-include_directories("${GLFW_SOURCE_DIR}/include"
-                    "${GLFW_SOURCE_DIR}/deps")
+include_directories("${GLFW_SOURCE_DIR}/deps")
 
 if (WIN32)
     set(ICON glfw.rc)

src/CMakeLists.txt

@@ -59,6 +59,9 @@ set_target_properties(glfw PROPERTIES
                       FOLDER "GLFW3")
 
 target_compile_definitions(glfw PRIVATE -D_GLFW_USE_CONFIG_H)
+target_include_directories(glfw PUBLIC
+                           $<BUILD_INTERFACE:${GLFW_SOURCE_DIR}/include>
+                           $<INSTALL_INTERFACE:$<INSTALL_PREFIX>/include>)
 target_include_directories(glfw PRIVATE
                            "${GLFW_SOURCE_DIR}/src"
                            "${GLFW_BINARY_DIR}/src"

tests/CMakeLists.txt

@@ -9,8 +9,7 @@ if (MSVC)
     add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 endif()
 
-include_directories("${GLFW_SOURCE_DIR}/include"
-                    "${GLFW_SOURCE_DIR}/deps")
+include_directories("${GLFW_SOURCE_DIR}/deps")
 
 set(GLAD "${GLFW_SOURCE_DIR}/deps/glad/glad.h"
          "${GLFW_SOURCE_DIR}/deps/glad.c")