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libtextstyle: be sure to have ostream_printf and hyperlink support

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Older versions of libtextstyle do not support them, rule them out.

Reported by Lars Wendler
https://lists.gnu.org/r/bug-bison/2020-07/msg00030.html

and by Arnold Robbins
https://lists.gnu.org/r/bug-bison/2020-07/msg00041.html and
https://lists.gnu.org/mailman/private/gawk-devel/2020-July/003988.html

and by Nelson H. F. Beebe
https://lists.gnu.org/mailman/private/gawk-devel/2020-July/003993.html

With support from Bruno Haible in gnulib
https://lists.gnu.org/r/bug-gnulib/2020-08/msg00000.html
thread starting at
https://lists.gnu.org/r/bug-gnulib/2020-07/msg00148.html

* configure.ac: Require libtextstyle 0.20.5.
* gnulib: Update.
This commit is contained in:
Akim Demaille
2020-07-26 18:00:15 +02:00
parent 0676801b8c
commit d975c2f76e
7 changed files with 21 additions and 9 deletions
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15
README
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@@ -42,9 +42,11 @@ installing it. In that case, do not use `src/bison`: it would use the
As an experimental feature, diagnostics are now colored, controlled by the
`--color` and `--style` options.
To use them, install the libtextstyle library before configuring Bison. It
is available from https://alpha.gnu.org/gnu/gettext/, for instance
https://alpha.gnu.org/pub/gnu/gettext/libtextstyle-0.20.5.tar.gz.
To use them, install the libtextstyle library, 0.20.5 or newer, before
configuring Bison. It is available from https://alpha.gnu.org/gnu/gettext/,
for instance https://alpha.gnu.org/gnu/gettext/libtextstyle-0.20.5.tar.gz,
or as part of Gettext 0.21 or newer, for instance
https://ftp.gnu.org/gnu/gettext/gettext-0.21.tar.gz.
The option --color supports the following arguments:
- always, yes: Enable colors.
@@ -61,6 +63,13 @@ To customize the styles, create a CSS file, say `bison-bw.css`, similar to
then invoke bison with `--style=bison-bw.css`, or set the `BISON_STYLE`
environment variable to `bison-bw.css`.
In some diagnostics, bison uses libtextstyle to emit special escapes to
generate clickable hyperlinks. The environment variable
`NO_TERM_HYPERLINKS` can be used to suppress them. This may be useful for
terminal emulators which produce garbage output when they receive the escape
sequence for a hyperlink. Currently (as of 2020), this affects some versions
of emacs, guake, konsole, lxterminal, rxvt, yakuake.
## Relocatability
If you pass `--enable-relocatable` to `configure`, Bison is relocatable.