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With a GCC snapshot:
  error: infinite recursion detected [-Werror=infinite-recursion]

Added a paragraph about config.guess and config.sub.

Computing POW_U before the division (instead of after) would reduce
the error in the intermediate result.

Command used:
  perl -pi -e 's/ (\d{4}-)?(2021)(?= Free Software)/
               " ".($1||"$2-").($2+1)/e' **/*(^/)
under zsh.
Removed 2021 from the example in the doc/README.dev file.

* New version-ext.sh file: sh script to output MPFR version information
  for a Git working tree (old code from tests/Makefile.am).
* tests/Makefile.am: replace some output_info code by the use of this
  script.
* Makefile.am: add version-ext.sh to EXTRA_DIST as a consequence
  (a comment explains why).
* README: list this new version-ext.sh file as a consequence.

tests/Makefile.am: in output_info, replaced "grep" by "$(GREP)".

tests/Makefile.am: when discarding excluded branches, the match should
be done on the full branch name, not a subword; so, added the -x grep
option (specified by POSIX).

tests/Makefile.am: updated output_info code to add " (modified)"
when the working tree has been modified (compared to HEAD).

tests/Makefile.am: removed the comment about the unimplemented
solution with possible *-branch tags (I think that it would not
work well with merges).

tests/Makefile.am: updated output_info code and comment.
We now use <branch>-root tags to find to correct branch, by excluding
branches created after the current HEAD.

tests/Makefile.am: in output_info, added a "|| true" on a shell command
that may fail (grep with no matches).

The recent additions to tests/Makefile.am work well for master (and
detached HEAD state), but not for the 4.1 branch, where $gitb gets
empty, even though testing from an interactive shell (/bin/sh = dash)
does not show any issue.

tests/Makefile.am: modified output_info to output:
  * the detected branch, which also works in detached HEAD state
    (for old commits that can be found in multiple branches,
    "master" is prefered over the other branches);
  * the total commit count;
  * the commit id (hash).

tests/Makefile.am: in output_info, add git info, but this does not
output the branch. For instance, on master, one gets something like
"4.1-root-491-g2933fad3", and something similar on the 4.1 branch.
As the solution needs to work in detached HEAD state, we may want to
add *-branch tags to identify the first commit of a branch, and use
  git describe --match '*-branch'
instead of
  git describe --match '*-root'

* doc/README.dev: update about the use in the MPFR manual (mpfr.texi).
* doc/mpfr.texi: minor correction.

Otherwise one gets a grave accent (thus "s − l" cannot be found).
If the "ℓ" is still an issue, one could alternatively use
  \pdfglyphtounicode{lscript}{006C}
to get an "l" (but "l" also matches "ℓ" in xpdf and atril).

This fixes some regressions compared to old LaTeX versions (in 2009).

The change done in 52138701 wasn't
working when the latest commit wasn't on "doc/mpfr.texi".

This is used to check that the doc/mpfr.texi UPDATED-MONTH value is
up-to-date by comparing it with the date of the latest commit.

Note: This is not needed at the end of a paragraph like here, but
this is a general warning, just in case text is added or moved.

This command was needed in the past, but it now generates a warning
"@refill is obsolete" (as of Texinfo 6.8 - 2021-07-03).
It is no longer needed, as least since Texinfo 4.2:
https://ftp.gnu.org/old-gnu/Manuals/texinfo-4.2/html_node/Refilling-Paragraphs.html