On Thu, 2024-06-13 at 07:55 +0800, Dan Jacobson wrote: > %.all.kmz: $(addsuffix .kml, $(addsuffix .$*.lines,0 1) $(addsuffix > .$*.labels,0 1)) > ls $* > $ make nnn.all.kmz > > Here, upon reaching the colon, the make program already has all the > information it needs to set $* to "nnn".
That is not true. In fact, make has NO IDEA what $@ or any other automatic variable will be _when it is parsing the makefile and expanding the prerequisites_. A pattern rule is a template that is applied not when the makefile is being parsed, but rather when make is walking the dependency graph trying to figure out which targets to build and how to build them. At the time make is parsing this rule it has no idea what target will match it, so it certainly cannot know that $@ will be nnn.all.kmz (for example). If you examine the content here: https://www.gnu.org/software/make/manual/html_node/Reading-Makefiles.html you will see in what order expansion happens. If you want to defer expansion until later, you can use: https://www.gnu.org/software/make/manual/html_node/Secondary-Expansion.html -- Paul D. Smith <psm...@gnu.org> Find some GNU Make tips at: https://www.gnu.org http://make.mad-scientist.net "Please remain calm...I may be mad, but I am a professional." --Mad Scientist
