Rework command line handling of build tool (#2373)

In `tools/build.py`:
- For the sake of readability, group CLI arguments as general build
  options, options to control the building of components, and
  component-specific options.
- To prevent duplications, remove the defaults from those CLI
  arguments that correspond to CMake options and have defaults in
  any of the CMakeLists. Should any of the defaults change, they
  will have to be changed at a single place only. (Those options
  that are not set on the command line of `tools/build.py` are not
  passed as options to `cmake` either.)
- Convert `--unittests` and `--doctests` to ON/OFF options like the
  rest of the component switches.
- Touch on some of the help messages of the CLI arguments.

Other changes:
- The change in `--unittests` and `--doctests` is a slightly CLI-
  breaking change of `tools/build.py`. Thus, follow up on this in
  `tools/run-tests.py`.
- Move `ENABLE_ALL_IN_ONE` into `jerry-core` as it is not a general
  option but specific to that component.
- Remove the forcing of `ENABLE_ALL_IN_ONE` for some compilers/
  platforms as it is still an option, not a hard requirement.

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

jerry-core/CMakeLists.txt

@@ -16,6 +16,9 @@ cmake_minimum_required (VERSION 2.8.12)
 set(JERRY_CORE_NAME jerry-core)
 project (${JERRY_CORE_NAME} C)
 
+# Optional build settings
+set(ENABLE_ALL_IN_ONE          OFF     CACHE BOOL   "Enable all-in-one build?")
+
 # Optional features
 set(FEATURE_CPOINTER_32_BIT    OFF     CACHE BOOL   "Enable 32 bit compressed pointers?")
 set(FEATURE_DEBUGGER           OFF     CACHE BOOL   "Enable JerryScript debugger?")
@@ -37,6 +40,12 @@ set(FEATURE_VM_EXEC_STOP       OFF     CACHE BOOL   "Enable VM execution stoppin
 set(MEM_HEAP_SIZE_KB           "512"   CACHE STRING "Size of memory heap, in kilobytes")
 
 # Option overrides
+if(USING_MSVC)
+  set(ENABLE_ALL_IN_ONE ON) # FIXME: This should not be needed but right now it is. To be tracked down and followed up.
+
+  set(ENABLE_ALL_IN_ONE_MESSAGE " (FORCED BY COMPILER)")
+endif()
+
 if(FEATURE_SYSTEM_ALLOCATOR)
   set(FEATURE_CPOINTER_32_BIT ON)
 
@@ -58,6 +67,7 @@ if(JERRY_CMDLINE_SNAPSHOT)
 endif()
 
 # Status messages
+message(STATUS "ENABLE_ALL_IN_ONE           " ${ENABLE_ALL_IN_ONE} ${ENABLE_ALL_IN_ONE_MESSAGE})
 message(STATUS "FEATURE_CPOINTER_32_BIT     " ${FEATURE_CPOINTER_32_BIT} ${FEATURE_CPOINTER_32_BIT_MESSAGE})
 message(STATUS "FEATURE_DEBUGGER            " ${FEATURE_DEBUGGER})
 message(STATUS "FEATURE_ERROR_MESSAGES      " ${FEATURE_ERROR_MESSAGES})