Re: MKDIR_P invocations

[Paul Eggert]

On 12/20/21 01:08, Bruno Haible wrote:
> @NMD@   $(MKDIR_P) '%reldir%' && \

Although that'd work, it might be a bit of a maintenance hassle.

How instead using a new macro $(AUTOMAKE_MKDIR_P) instead of $(MKDIR_P)? 
AUTOMAKE_MKDIR_P would default to $(MKDIR_P), but GNU Emacs could 
override this and set AUTOMAKE_MKDIR_P=':'. This would let us use 
ordinary Make and shell syntax rather than inventing a new one.

One related topic. Many Gnulib modules list makefile rules containing 
many instances of '&& \' at line ends. How about if we omit the '&& \' 
when that's easy? Something like the attached, but for all the modules 
not just this one. I noticed this when looking at the $(MKDIR_P) stuff. 
This would break apart 'make' recipes into smaller commands, which is a 
good thing. And it would let GNU make invoke rm, mkdir, sed, and mv 
directly instead of via a subshell, which would be a minor efficiency plus.

(I suppose we should also omit that 'rm -f $@-t $@'; it shouldn't be 
needed and it just slows things down on slow build hosts like some of 
those that I use.)

If we do the above, we should be able to add a sed command like this:

        /^      \$(AM_V_at)\$(AUTOMAKE_MKDIR_P) '\.'$/d

at the appropriate places in gnulib-tool, to omit the odd-looking 'mkdir 
-p .' calls from the makefiles and make logs.

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