h3	#cflags

pre	#cflags <option1> <option2> ...
p	Example:
pre	#cflags	$CFLAGS --reserve-regs-iy

p	Define or modify the flags passed to the c compiler.
p	This option is only useful if you include c sources.

p	#cflags defines new flags for the c compiler. If you just want to add another option, you can include the current flags with the keyword $CFLAGS.

p	Some flags are always added and cannot be removed with #cflags:
	The flags '-S' and '-mz80' for sdcc
	An include directory passed with "-I" on the command line.
p	After your custom flags zasm adds '-o', the destination file name and the source file name. In case you use a different c compiler (i don't know whether this is possible) then you can modify passing of the source and destination file with the keywords $SOURCE and $DEST.

h5	useful flags for sdcc:

pre	-Dname[=value]        	Define macro
	-Ipath                	Add to the header include path
	--nostdinc            	Do not include the standard directory in the #include search path
	--Werror              	Treat warnings as errors
	--std-c89             	Use C89 standard (slightly incomplete)
	--std-sdcc89          	Use C89 standard with SDCC extensions (default)
	--std-c99             	Use C99 standard (incomplete)
	--std-sdcc99          	Use C99 standard with SDCC extensions
	--funsigned-char      	Make "char" unsigned by default
	--disable-warning nnnn 	Disable specific warning
	 
	--callee-saves func[,func,...]  Cause the called function to save registers instead of the caller
	--all-callee-saves		all functions save and restore all registers
	--callee-saves-bc		all functions save/restore BC on entry/exit (z80 only)
	--fomit-frame-pointer	Leave out the frame pointer.
	--fno-omit-frame-pointer  Never omit frame pointer (z80 only)
	--stack-probe			insert call to function __stack_probe at each function prologue
	--no-c-code-in-asm		don't include c-code as comments in the asm file
	--no-peep-comments		don't include peephole optimizer comments
	--codeseg name			put code (and const's) in .area _name, e.g. --codeseg CODE => .area _CODE
	--reserve-regs-iy		Do not use IY (incompatible with --fomit-frame-pointer) (z80 only)
	 
	--nogcse              No GCSE optimisation
	--nolabelopt          No label optimisation
	--noinvariant         No optimisation of invariants
	--noinduction         No loop variable induction
	--nojtbound           No boundary check for jump tables (dangerous)
	--noloopreverse       No loop reverse optimisation
	--no-peep             No peephole assembly file optimisation
	--no-reg-params       Don't some parameters in registers (On some ports)  TODO: z80?
	--peep-asm            Do peephole optimization on inline assembly
	--peep-return         Do peephole optimization for return instructions
	--no-peep-return      No peephole optimization for return instructions
	--peep-file file	  use this extra peephole file
	--max-allocs-per-node Maximum number of register assignments considered at each node of the tree decomposition
	--nolospre            Disable lospre. lospre is an advanced redundancy elimination technique,
						  essentially an improved variant of global subexpression elimination.
	--lospre-unsafe-read  Allow unsafe reads in lospre. code may sometimes read from random memory locations.
						  (should be ok for the z80, because it has no memory mapped i/o)