{{fbdoc item="title" value="__FB_GUI__"}}----
Intrinsic define (macro value) set by the compiler

{{fbdoc item="syntax"}}##
	""__FB_GUI__""
##
{{fbdoc item="desc"}}
	##""__FB_GUI__""## indicates whether GUI subsystem mode is active at the current point in compilation.
	
	Returns non-zero (-1) if the executable subsystem option ##-s gui## was specified, or if ##[[KeyPgPpPragma|#pragma gui]]## is active. Returns zero (0) otherwise.

{{fbdoc item="ex"}}
{{fbdoc item="filename" value="examples/manual/defines/fbgui.bas"}}%%(freebasic)
#if __FB_GUI__ <> 0
		#print Executable subsystem: gui
#else 
		#print Executable subsystem: console
#endif
%%
{{fbdoc item="ver"}}
	- Since fbc 1.06.0

{{fbdoc item="target"}}
	- On Windows and Cygwin, this controls the linker subsystem.
	- Other targets may use the same mode value for target-specific startup or runtime behavior.

{{fbdoc item="diff"}}
	- New to ""FreeBASIC""

{{fbdoc item="see"}}
	- [[CompilerOpts|Compiler Option: -s]]
	- ##[[KeyPgPpPragma|#pragma]]##

{{fbdoc item="back" value="CatPgDddefines|Intrinsic Defines"}}