Copying JSON files to pick up config for built libraries

This came up when building tests, but affects any library that's built
that uses config and included as "source" with the mbed tools.
JSON files are not copied by default when building a library, so when this
is built it loses the config data associated with the library. This commit
copies all JSON files into the build directory when building libraries.

This leads to two mbed_config.h files existing if the build directories
are different between the library and application build. This is the case
when building tests, so an option build_library was added to remove the
mbed_config.h file when compilation is done. This disabled by default when
building libraries, but it is enabled when building tests.

tools/build_api.py

@@ -17,11 +17,10 @@ limitations under the License.
 
 import re
 import tempfile
-
 from types import ListType
 from shutil import rmtree
 from os.path import join, exists, basename, abspath, normpath
-from os import linesep
+from os import linesep, remove
 from time import time
 
 from tools.utils import mkdir, run_cmd, run_cmd_ext, NotSupportedException,\
@@ -489,7 +488,8 @@ def build_library(src_paths, build_path, target, toolchain_name,
                   dependencies_paths=None, options=None, name=None, clean=False,
                   archive=True, notify=None, verbose=False, macros=None,
                   inc_dirs=None, jobs=1, silent=False, report=None,
-                  properties=None, extra_verbose=False, project_id=None):
+                  properties=None, extra_verbose=False, project_id=None,
+                  remove_config_header_file=False):
     """ Build a library
 
     Positional arguments:
@@ -515,6 +515,7 @@ def build_library(src_paths, build_path, target, toolchain_name,
     properties - UUUUHHHHH beats me
     extra_verbose - even more output!
     project_id - the name that goes in the report
+    remove_config_header_file - delete config header file when done building
     """
 
     # Convert src_path to a list if needed
@@ -582,6 +583,8 @@ def build_library(src_paths, build_path, target, toolchain_name,
         toolchain.copy_files(resources.objects, build_path, resources=resources)
         toolchain.copy_files(resources.libraries, build_path,
                              resources=resources)
+        toolchain.copy_files(resources.json_files, build_path,
+                             resources=resources)
         if resources.linker_script:
             toolchain.copy_files(resources.linker_script, build_path,
                                  resources=resources)
@@ -598,6 +601,11 @@ def build_library(src_paths, build_path, target, toolchain_name,
         if archive:
             toolchain.build_library(objects, build_path, name)
 
+        if remove_config_header_file:
+            config_header_path = toolchain.get_config_header()
+            if config_header_path:
+                remove(config_header_path)
+
         if report != None:
             end = time()
             cur_result["elapsed_time"] = end - start

tools/test.py

@@ -177,7 +177,8 @@ if __name__ == '__main__':
                                                 macros=options.macros,
                                                 verbose=options.verbose,
                                                 notify=notify,
-                                                archive=False)
+                                                archive=False,
+                                                remove_config_header_file=True)
 
                 library_build_success = True
             except ToolException, e: