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Re: Future plans for Autotools

From: Gavin Smith
Subject: Re: Future plans for Autotools
Date: Sun, 31 Jan 2021 22:32:31 +0000
User-agent: Mutt/1.9.4 (2018-02-28)

On Sun, Jan 31, 2021 at 10:14:11PM +0000, Gavin Smith wrote:
> Another issue is how to record the results of tests from a a Makefile.
> With autoconf, autoconf variables are recorded with AC_CONFIG_FILES
> and AC_CONFIG_HEADERS.  Presumably the same would have to be done,
> substituting in an output file with the values of these variables.
> However, there can be many hundreds of them (just look at a
> file).  As far as I can tell, there isn't an easy way to export
> hundreds of Makefile variables to a process.  Is there some feature or
> trick I'm missing?

I was mislead by the Make manual talking about communicating with
a sub-make: the .EXPORT_ALL_VARIABLES target appears to export
for any rule (although I didn't get the $(export) directive to work for
this).  This could be used by a helper script to do substitution.

The "finish-configure" target in the following outputs "1 2 3":


        $(eval A := $(shell echo 1))

        $(eval B := $(shell echo 2))

        $(eval C := $(shell echo 3))

finish-configure: set-A set-B set-C
        echo $$A $$B $$C

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