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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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16
data/stack.hh
View File

@@ -19,12 +19,8 @@
# b4_stack_file
# -------------
# Name of the file containing the stack class, if we want this file.
b4_percent_define_ifdef([[api.stack.file]],
[b4_percent_define_check_values([[[[api.stack.file]],
[[none]]]])],
[b4_defines_if([b4_percent_define_ifdef([[api.location.file]],
[],
[m4_define([b4_stack_file], [stack.hh])])])])
b4_defines_if([b4_required_version_if([302], [],
[m4_define([b4_stack_file], [stack.hh])])])
# b4_stack_define
@@ -138,17 +134,13 @@ m4_define([b4_stack_define],
};
]])
m4_ifdef([b4_stack_file],
[b4_output_begin([b4_dir_prefix], [b4_stack_file])[
// Starting with Bison 3.2, this file is useless: the structure it
// used to define is now defined with the parser itself.
//
// To get rid of this file:
// 1. add '%define api.stack.file none'
// or '%define api.location.file none'
// or '%define api.location.file "my-loc.hh"' to your grammar file
// 2. add 'require "3.2"' to your grammar file
// 3. remove references to this file from your build system.
// 1. add 'require "3.2"' (or newer) to your grammar file
// 2. remove references to this file from your build system.
]b4_output_end[
]])