With fasm.exe (console version) trying to define a label with a space from the command line will cause fasm to quit without an error.

Code:

C:\>fasm source.asm -m 1000 -d x=y\ z flat assembler  version 1.71.51  (1000 kilobytes memory) C:\>

It makes no difference if the file "source.asm" exists or not. The label 'x' should be defined to 'y z'.

Using 'define x y z' in the source file will define the label correctly.

Edit: Fixed in version 1.71.52

This appears to be a misplaced jump destination. If we change line 104 in "PREPROCE.INC" it appears to fix the problem:

Code:

cmp     al,20h         je      convert_line_data         cmp     al,3Bh

Code:

cmp     al,20h         je      convert_predefinition ;<---- new destination         cmp     al,3Bh

Code:

C:\>fasm source.asm -m 1000 -d x=y\ z flat assembler  version 1.71.51  (1000 kilobytes memory) error: source file not found. C:\>

And now properly returns an error status. And if the source file exists then it proceeds to assemble as usual with the defined value as specified.