attached file is a fasm 1.67.21 patch (for linux) which adds support for symbolic constants definition through command line. e.g. "fasm -dSYMBOL:=1234 -dSYMBOL2:=4321 test.asm"
i lacked this feature recently when working with makefiles... maybe someone will find it useful as well.
put fasm.diff in a fresh fasm directory and do $ patch -p 1 -i fasm.diff

P.S. wasn't thoroughly tested, but worked for me..

arafael: very nice, just one thing

:= ?!?!?!??
why not just =?

parser requires symbol`s value to be preceded by two bytes (flag and size). it was either replacing the ":=" or reconstructing the string at some other location. later seems to waste more memory. not that it matters that much considering the given proportions, but anyway.

oh, that
also i think you should stick to more standard /D instead of /d

Hey arafel.

It is a really cool option.

however I remember reading somewhere about the no command line stuff in fasm.
I really liked that principle as now people can never add strange command lines and parameters. [What you put in the source is what you get].
As useful as this option is , I rather keep the no command line principle , which is one of the things that makes fasm so special.
Just my opinion.

realcr.

Hi realcr,

For an assembler type application - minimal or no platform compatibility, massive projects are rarity, etc. Where there is almost no need in adjusting lots of compilation parameters 'no command line' approach probably has some benefits. Actually quite a few in my opinion.
For anything else though, I have strong suspicion it will add more problems than improvements
Anyways, I agree fasm should stay as it is.