Add pkg-config metadata files for libraries (#2680)

Should core, ext, libm, and/or port libraries be properly installed
on some system, help compilation and linking against them by
providing standard `.pc` files, which can be picked up by
pkg-config.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/CMakeLists.txt

@@ -276,14 +276,22 @@ target_compile_definitions(${JERRY_CORE_NAME} PUBLIC ${DEFINES_JERRY})
 target_include_directories(${JERRY_CORE_NAME} PUBLIC ${INCLUDE_CORE_PUBLIC})
 target_include_directories(${JERRY_CORE_NAME} PRIVATE ${INCLUDE_CORE_PRIVATE})
 
+set(JERRY_CORE_PKGCONFIG_REQUIRES)
+set(JERRY_CORE_PKGCONFIG_LIBS)
+
 if(JERRY_LIBM)
   target_link_libraries(${JERRY_CORE_NAME} jerry-libm)
+  set(JERRY_CORE_PKGCONFIG_REQUIRES libjerry-libm)
 endif()
 
 separate_arguments(EXTERNAL_LINK_LIBS)
 foreach(EXT_LIB ${EXTERNAL_LINK_LIBS})
   target_link_libraries(${JERRY_CORE_NAME} ${EXT_LIB})
+  set(JERRY_CORE_PKGCONFIG_LIBS "${JERRY_CORE_PKGCONFIG_LIBS} -l${EXT_LIB}")
 endforeach()
 
+configure_file(libjerry-core.pc.in libjerry-core.pc @ONLY)
+
 install(TARGETS ${JERRY_CORE_NAME} DESTINATION lib)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libjerry-core.pc DESTINATION lib/pkgconfig)
 install(DIRECTORY ${INCLUDE_CORE_PUBLIC}/ DESTINATION include)

jerry-core/libjerry-core.pc.in

@@ -0,0 +1,12 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+libdir=${prefix}/lib
+includedir=${prefix}/include
+
+Name: libjerry-core
+Description: JerryScript: lightweight JavaScript engine (core engine library)
+URL: https://github.com/pando-project/jerryscript
+Version: 1.0
+Requires.private: @JERRY_CORE_PKGCONFIG_REQUIRES@ # NOTE: libjerry-port-default* is not added as a required package
+Libs: -L${libdir} -ljerry-core
+Libs.private: @JERRY_CORE_PKGCONFIG_LIBS@
+Cflags: -I${includedir}