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Variables in *.pro files

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pro qmake qt qt3 qt5 variable variables

DEFINES = "VAR=$VAR"
DEFINES = "VAR=$$VAR"
DEFINES = "VAR=$(VAR)"
DEFINES = "VAR=$$(VAR)"
DEFINES = "VAR=${VAR}"
DEFINES = "VAR=$${VAR}"

Makefile:	$VAR	$$VAR	$(VAR)	$$(VAR)	${VAR}	$${VAR}
VAR=	$VAR		$(VAR)		${VAR}	 
{cmd:}VAR=SET	$VAR		$(VAR)	SET	${VAR}	 
{pro:}VAR=SET	$VAR	SET	$(VAR)		${VAR}	SET