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NEWS: update

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Akim Demaille
2019-04-25 20:10:54 +02:00
parent 9260e5ca4f
commit 571447afe8
1 changed files with 56 additions and 31 deletions
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NEWS
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@@ -2,37 +2,6 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
** Changes
*** Graphviz output
In conformance with the recommendations of the Graphviz team, if %require
"3.4" (or better) is specified, the option --graph generates a *.gv file
by default, instead of *.dot.
*** Diagnostics overhaul
Column numbers were wrong with multibyte characters, which would also
result in skewed diagnostics with carets. Beside, because we were
indenting the quoted source with a single space, lines with tab characters
were incorrectly underlined.
To address these issues, and to be clearer, Bison now issues diagnostics
as GCC9 does. For instance it used to display (there's a tab before the
opening brace):
foo.y:3.37-38: error: $2 of ‘expr’ has no declared type
expr: expr '+' "number" { $$ = $1 + $2; }
^~
It now reports
foo.y:3.37-38: error: $2 of ‘expr’ has no declared type
3 | expr: expr '+' "number" { $$ = $1 + $2; }
| ^~
Other constructs now also have better locations, resulting in more precise
diagnostics.
** New features
*** Colored diagnostics
@@ -95,6 +64,53 @@ GNU Bison NEWS
definition of locations: let one of them generate them, and the others
just use them.
** Changes
*** Graphviz output
In conformance with the recommendations of the Graphviz team, if %require
"3.4" (or better) is specified, the option --graph generates a *.gv file
by default, instead of *.dot.
*** Diagnostics overhaul
Column numbers were wrong with multibyte characters, which would also
result in skewed diagnostics with carets. Beside, because we were
indenting the quoted source with a single space, lines with tab characters
were incorrectly underlined.
To address these issues, and to be clearer, Bison now issues diagnostics
as GCC9 does. For instance it used to display (there's a tab before the
opening brace):
foo.y:3.37-38: error: $2 of ‘expr’ has no declared type
expr: expr '+' "number" { $$ = $1 + $2; }
^~
It now reports
foo.y:3.37-38: error: $2 of ‘expr’ has no declared type
3 | expr: expr '+' "number" { $$ = $1 + $2; }
| ^~
Other constructs now also have better locations, resulting in more precise
diagnostics.
*** Fix-it hints for %empty
Running Bison with -Wempty-rules and --update will remove incorrect %empty
annotations, and add the missing ones.
*** Generated reports
The format of the reports (parse.output) was improved for readadibility.
*** Better support for --no-line.
When --no-line is used, the generated files are now cleaner: no lines are
generated instead of empty lines. Together with using api.header.include,
that should help people saving the generated files into version control
systems get smaller diffs.
** Documentation
A new example in C shows an simple infix calculator with a hand-written
@@ -103,6 +119,15 @@ GNU Bison NEWS
A new example in C shows a reentrant parser (capable of recursive calls)
built with Flex and Bison (examples/c/reccalc).
There is a new section about the history of Yaccs and Bison.
** Bug fixes
A few obscure bugs were fixed, including the second oldest (known) bug in
Bison: it was there when Bison was entered in the RCS version control
system, in December 1987. See the NEWS of Bison 3.3 for the previous
oldest bug.
* Noteworthy changes in release 3.3.2 (2019-02-03) [stable]
** Bug fixes