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C++: let %require "3.2" disable the generation of obsolete files

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The files stack.hh and position.hh are deprecated.  Rather than
devoting specify %define variables to discard them (api.position.file
and api.stack.file), and rather than having to use special rules when
api.location.file is used, let's simply decide that from %require
"3.2" onwards, these files will not be generated.

The only noticeable thing here is that, in order to be able to check
the behavior of %require "3.2", to have this version (which is still
3.1-*) to accept %require "3.2".

* src/gram.h, src/gram.c (required_version): New.
* src/parse-gram.y (version_check): Set it.
* src/output.c (prepare): Pass it m4.
* data/bison.m4 (b4_required_version_if): Receive it and use it.
* data/location.cc, data/stack.hh: Replace the api.*.file with only
required version comparison.
* tests/input.at: No longer check api.stack.file and api.position.file.
* NEWS, doc/bison.texi: Don't mention them.
Document the %require 3.2 behavior.
* tests/output.at: Use %require 3.2 instead.
This commit is contained in:
Akim Demaille
2018-10-15 14:04:00 +02:00
parent 2b0a9c69df
commit ea31f21fd8
11 changed files with 76 additions and 122 deletions
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10
data/bison.m4
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@@ -61,6 +61,16 @@ This special exception was added by the Free Software Foundation in
version 2.2 of Bison.])])
# b4_required_version_if(VERSION, IF_NEWER, IF_OLDER)
# ---------------------------------------------------
# If the version %require'd by the user is VERSION (or newer) expand
# IF_NEWER, otherwise IF_OLDER. VERSION should be an integer, e.g.,
# 302 for 3.2.
m4_define([b4_required_version_if],
[m4_if(m4_eval($1 <= b4_required_version),
[1], [$2], [$3])])
## -------- ##
## Output. ##
## -------- ##