Re: MAKEFLAGS=-r

[Jeffrey Walton]

On Mon, Jul 17, 2023 at 11:47 AM Paul Smith <psmith@gnu.org> wrote:
>
> On Mon, 2023-07-17 at 11:45 +0200, Bruno Haible wrote:
> > Dmitry Goncharov wrote:
> > > Once the makefile author knows the makefile does not need built-in
> > > rules, they should add MAKEFLAGS=-r in the makefile and
> > > this will do a good service to all their users.
>
> I'm not sure I've followed the entire discussion yet, but FYI I do not
> usually recommend this method of clearing the default rules.  There are
> issues with modifying MAKEFLAGS, especially with some older versions of
> GNU Make.  And also, in some older versions setting MAKEFLAGS in the
> makefile doesn't actually take effect anyway: it only helps for sub-
> makes.
>
> My recommendation has been to disable the built-in rules directly, if
> you don't need them.  For example you can use:
>
>   .SUFFIXES:
>
> to disable most of the built in rules (this is a POSIX standard
> facility so it's helpful even for other versions of make).
>
> Unfortunately that doesn't fix all problems because GNU Make also has a
> few built-in rules that are defined using pattern rules (because suffix
> rules are not powerful enough).  So a full list of "turn it all off"
> would be this:
>
>   .SUFFIXES:
>   %:: %,v
>   %:: RCS/%,v
>   %:: RCS/%
>   %:: s.%
>   %:: SCCS/s.%

SUFFIXES does not seem to work too well. 'make -d' still shows all the
extra noise. For example, I added to the top of my GNUmakefile:

   .SUFFIXES: .h .c .cpp .S .o

I still see:

$ make -d -f GNUmakefile
GNU Make 4.3
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
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