Hi Paul, I downloaded the PDF and failed to find _target, _type. I must miss you point. Please guide further. Thanks. Ming ________________________________ From: Paul Smith <paul@xxxxxxxxxxxxxxxxx> Sent: Tuesday, June 21, 2022 11:55 AM To: Ming Cheng <chengm349@xxxxxxxxxxx> Cc: gcc-help <gcc-help@xxxxxxxxxxx> Subject: Re: Fw: Makefile format On Tue, 2022-06-21 at 10:42 +0100, Jonathan Wakely via Gcc-help wrote: > > Thanks for your kind first step. I should have made my question > > more clearer. > > > > We have a module called abc. Amazingly user can just define > > abc_type, abc_target; and GNU make seems to me that according to > > its rules will implicitly look for these bars if defined. Does the > > same doc have these rules description? > > Yes, the GNU Make manual is detailed and complete, see > https://www.gnu.org/software/make/manual/html_node/Catalogue-of- > Rules.html#Catalogue-of-Rules > This is off-topic for the gcc-help list though. Please use the help-make@xxxxxxx mailing list for assistance using GNU make. Cheers!