Re: src/Makefile unhelpful

[Eli Zaretskii <eliz@gnu.org>]

> From: Richard Stallman <rms@gnu.org>
> Date: Tue, 06 Sep 2022 22:19:08 -0400
> 
> Building temacs, when compiling the C source files, outputs lines like these
> 
>   CC       dispnew.o
>   CC       frame.o
>   CC       scroll.o
>   CC       xdisp.o
> 
> which don't show the arguments actually used.
> (Why does it show that instead of the actual command?
> What code in the Makefile causes this?
> Perhaps add comments to explain this.)
> 
> To show all the arguments on each line would be a nuisance,
> but when one wants to investigate what they were,
> I find no easy way to do it.  How do you do that?

The way to see the arguments is to say

  make V=1

> Anyway, I think it would be useful for each make run to output, for
> debugging, each actual command.  It could show each of the usual
> commands once, or (if it isn't hard) only the usual commands that were
> actually executed.  To show, for instance, what this expands into:
> 
> 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $(PROFILING_CFLAGS)
> 
> at least if the .c.o rule is ever used.

I think this is rarely needed, so having it silent by default is
better.