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warnings: don't complain about m4_foo and b4_foo when from the user

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Currently, occurrences of these identifiers in the user's input yield
spurious warnings.

To tell the difference between a legitimate m4_foo from the user, and
a bad m4_foo coming from a non-evaluated macro of a skeleton, escape
the user's identifiers as m4@'_foo.  We already use @' as a special
sequence to be stripped from the skeleton's output.

See <https://lists.gnu.org/r/bug-bison/2021-10/msg00026.html> and
previous commit ("warnings: be less picky about occurrences of m4_/b4_
in the output").

* src/flex-scanner.h (OBSTACK_SGROW): New.
* src/output.c (output_escaped): Escape m4_ and b4_.
* src/scan-code.l: Likewise.
* src/system.h (obstack_escape): Likewise.
And rewrite as a function.
* tests/skeletons.at (Suspicious sequences): Make sure the user can
use m4_foo/b4_foo without spurious warnings.
This commit is contained in:
Akim Demaille
2021-11-07 09:27:52 +01:00
parent c95d0dd5f5
commit 6571c2d1b1
6 changed files with 94 additions and 25 deletions
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NEWS
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@@ -2,6 +2,9 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
Fixed portability issues of the test suite on Solaris.
Fixed spurious warnings about input containing `m4_` or `b4_`.
* Noteworthy changes in release 3.8.2 (2021-09-25) [stable]