incremental build of make

2017-11-21 Thread 李伟(吾晨)
HI All: When I build my big project , the make takes about 2.45 minutes to  include all makefile and then start to build.One question:Can Make store the makefile datas for the next build, especially for the incremental building. I thinks this is a good feature for make. thanks :)_

Re: mention if a=b make = make a=b

2017-11-21 Thread 積丹尼 Dan Jacobson
> "EW" == Edward Welbourne writes: EW> They're not quite equivalent, although an example like the one you give EW> may be a good one for the documentation to explore in explaining what EW> the difference is. Yes that is what I hope will be done. _

Re: mention if a=b make = make a=b

2017-11-21 Thread Robert Pluim
積丹尼 Dan Jacobson writes: > (info "(make) Environment") should mention how equivalent > $ a=b make #and > $ make a=b > are to each other. > See also http://debbugs.gnu.org/29270 But they're not the same. The second one will override a setting of 'a' in the Makefile, the first one won't. Robert

Re: mention if a=b make = make a=b

2017-11-21 Thread Andreas Schwab
On Nov 21 2017, Edward Welbourne wrote: > I can't remember what happens if you use += in the make-file: I'm fairly > sure it extends whatever you had in the environment, but I can't > remember whether it extends a value set on the command-line. It doesn't. Andreas. -- Andreas Schwab, SUSE Lab

Re: mention if a=b make = make a=b

2017-11-21 Thread Edward Welbourne
Dan Jacobson (20 November 2017 23:50) > (info "(make) Environment") should mention how equivalent > $ a=b make #and > $ make a=b > are to each other. > See also http://debbugs.gnu.org/29270 They're not quite equivalent, although an example like the one you give may be a good one for the documentat