gnulib @ Savannah: GNU gnulib: calling for beta-testers

If you are developer on a package that uses GNU gnulib as part of its build system:

gnulib-tool has been known for being slow for many years. We have listened to your complaints. A rewrite of gnulib-tool in another programming language (Python) is ready for beta-testing. It is between 8 times and 100 times faster than the original gnulib-tool.

Both implementations should behave identically, that is, produce the same generated files and the same output. You can help us ensure this, through the following steps:

1. Make sure you have Python (version 3.7 or newer) installed on your machine.

2. Update your gnulib checkout. (For some packages, it comes as a git submodule named 'gnulib'.) Like this:

$ git checkout master

$ git pull

Set the environment variable GNULIB_SRCDIR, pointing to this checkout.

If the package is using a git submodule named 'gnulib', it is also advisable to do

$ git commit -m 'build: Update gnulib submodule to latest.' gnulib

(as a preparation for step 5, because the --no-git option does not work as expected in all variants of 'bootstrap').

3. Set an environment variable that enables checking that the two implementations behave the same:

$ export GNULIB_TOOL_IMPL=sh+py

4. Clean the built files of your package:

$ make -k distclean

5. Regenerate the fetched and generated files of your package. Depending on the package, this may be a command such as

$ ./bootstrap --no-git --gnulib-srcdir=$GNULIB_SRCDIR

or

$ export GNULIB_SRCDIR; ./autopull.sh; ./autogen.sh

or, if no such script is available:

$ $GNULIB_SRCDIR/gnulib-tool --update

If there is a failure, due to differences between the 'sh' and 'py' results, please report it to bug-gnulib@gnu.org.

6. If this invocation was successful, you can trust the rewritten gnulib-tool and use it from now on, by setting the environment variable

$ export GNULIB_TOOL_IMPL=py

7. Continue with

$ ./configure

$ make

as usual.

And enjoy the speed! The rewritten gnulib-tool was implemented by Dmitry Selyutin, Collin Funk, and me.

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