Issue 5020 - Part 2: Fix usage of paths in compile script

compile

 #!/usr/bin/env python
 
 import os
 import re
 import subprocess
 
-EMSCRIPTEN_PATH = '../emscripten'
-SOURCE_DIR = './compiled'
+BASE_DIR = os.path.dirname(__file__)
+EMSCRIPTEN_PATH = os.path.join(BASE_DIR, '..', 'emscripten')
+SOURCE_DIR = os.path.join(BASE_DIR, 'compiled')
 SOURCE_FILES = [
     os.path.join(path, f)
     for (path, dirs, files) in os.walk(SOURCE_DIR)
     for f in files
     if f.endswith('.cpp')
 ]
 BINDINGS_FILE = os.path.join(SOURCE_DIR, 'bindings.cpp')
 BINDINGS_GENERATOR = os.path.join(SOURCE_DIR, 'bindings.cpp.js')
 BINDINGS_OUTPUT = os.path.join(SOURCE_DIR, 'bindings.js')
-COMPILER_OUTPUT = './lib/compiled.js'
+COMPILER_OUTPUT = os.path.join(BASE_DIR, 'lib', 'compiled.js')
 GENERATION_PARAMS = {
     'SHELL_FILE': "'{}'".format(os.path.abspath(os.path.join(SOURCE_DIR,
                                                              'shell.js'))),
     'ASM_JS': 2,  # "almost asm"
     'TOTAL_MEMORY': 16*1024*1024,
     'TOTAL_STACK': 1*1024*1024,
     'ALLOW_MEMORY_GROWTH': 1,
     'NO_EXIT_RUNTIME': 1,
     'NO_DYNAMIC_EXECUTION': 1,
     'NO_FILESYSTEM': 1,
@@ skipping 47 matching lines @@
     for key, value in GENERATION_PARAMS.iteritems():
         params.extend(['-s', '{}={}'.format(key, str(value))])
     params.extend(ADDITIONAL_PARAMS)
     subprocess.check_call(params, env=env)
 
 
 if __name__ == '__main__':
     env = getenv()
     generate_bindings(env)
     run_compiler(env)