[GRASS-dev] Makefile change in r.out.tiff

[Glynn Clements]

Markus Neteler wrote:

> ok - reverted. If you come across another one cause by me,
> please revert directly in CVS. It seems that Makefile rules 
> remain mysterious for me :-)
> I got inspired by
> 
> http://grass.itc.it/pipermail/grass-commit/2007-October/030502.html

You moved it one line too far; PGM must be set before including
Module.make.

In general, the point at which variables get defined doesn't matter if
they are only used in commands, but it matters if they are used in the
dependency line.

Essentially, dependency lines get expanded at the point they are read,
while commands are expanded at the point they are executed.

AFAICT, the list of variables where the order is significant is:

	PGM
	LIB_NAME
	SUBDIRS
	CMD_OBJS
	LIB_OBJS
	LOCAL_HEADERS
	EXTRA_HEADERS
	DEPENDENCIES

-- 
Glynn Clements <glynn at gclements.plus.com>