Command line arguments for compiler (birdeec)

Birdee compiler can be invoked by command line. The executable file of Birdee compiler should be "birdeec" or "birdeec.exe".

The accepted arguments are listed in the following table. Note that the "[..]" means a user input string.

Arugment	Alias	Optional?	Explanations
-i [file_name]	N/A	Required	The input source file path
-o [file_name]	N/A	Required	The output file path
-s	--script	Optional	Treat the input source file as a python generative script
-e	N/A	Optional	Put the top-level code in a function called "main" instead of "{modulename}.main"
N/A	--corelib	Optional	Prevent the compiler from auto importing the core Birdee modules for the source code
N/A	--printir	Optional	Print the LLVM IR to stderr after compilation
-p [prefix]	N/A	Optional	Prepend a prefix for each global symbols of the compiled object file
N/A	--print-import	Optional	Don't compile the whole file. Print the imported module names and currently compiled module to stdout only. Cannot be used with "-s" switch. "-o" switch can be omitted when using this switch
-O [optimize-level]	N/A	Optional	Set the optimization level of the compiler, optimize-level can be 0~3. "-O 0" means no optimization. The larger optimize-level, the more aggressive optimization. By default to be 0
--llvm-opt-start ... --llvm-opt-end	N/A	Optional	Give the arguments between "--llvm-opt-start" and "--llvm-opt-end" to the LLVM optimizer.