[Octave-bug-tracker] [bug #55613] Build failure with bison 3.3.1

[Mike Miller]

Update of bug #55613 (project octave):

                  Status:               Need Info => Confirmed              

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Follow-up Comment #2:

Here is the new behavior from bison 3.3.1:


$ cat conftest.yy
%define api.prefix {foo_}
%start input
%%
input:;
%%
$ bison -y conftest.yy 
conftest.yy:1.1-7: warning: POSIX Yacc does not support %define [-Wyacc]
 %define api.prefix {foo_}
 ^~~~~~~


The '-y' option is added automatically by autoconf's support for bison/yacc to
make bison behave like POSIX yacc. The warning is only emitted when the '-y'
option is present, and only with bison version 3.3 or later.

Octave's configure script captures both stdout and stderr and expects them to
be empty to test for success. This warning is interpreted as a failure and so
configure thinks that bison doesn't work with any of the known formats.

In the meantime, autoconf has been changed to drop the '-y' option on bison
(https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=42761668c0300afa7f8bf5ba736458a818cd5d15),
but that version of autoconf has not been released yet.

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