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gst/parse: define pure-parser depending on bison version

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After release bison 2.5 the declaration %pure-parser was deprecated
in favor of %define api.pure

Nonetheless, until bison 3.4, the declaration was treated as backward
compatibility, but now bison shows a warning:

  warning: deprecated directive, use ‘%define api.pure’

The patch's approach is to handle both directives according with the
used bison's version, by string replacement at source configuration
stage.
This commit is contained in:
Víctor Manuel Jáquez Leal 2019-08-26 12:48:28 +02:00 committed by Tim-Philipp Müller
parent 44623cacd6
commit 77141834bb
2 changed files with 11 additions and 2 deletions
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2
gst/parse/grammar.y → gst/parse/grammar.y.in
View file

@ -796,7 +796,7 @@ static int yyerror (void *scanner, graph_t *graph, const char *s);
%lex-param { void *scanner }
%parse-param { void *scanner }
%parse-param { graph_t *graph }
%pure-parser
@BISON_PURE_PARSER@
%start graph
%%

11
gst/parse/meson.build
View file

@ -27,6 +27,7 @@ gen_lex = configure_file(input : 'gen_lex.py.in',
configuration : flex_cdata)
# Find bison, configure grammar generator
bison_parser_cdata = configuration_data()
bison_cdata = configuration_data()
bison_min_version='2.4'
@ -44,7 +45,15 @@ else
message('bison version @0@ >= @1@: YES'.format(bversion, bison_min_version))
endif
if bversion.version_compare('>' + '2.5')
bison_parser_cdata.set('BISON_PURE_PARSER', '%define api.pure full')
else
bison_parser_cdata.set('BISON_PURE_PARSER', '%pure-parser')
endif
gen_grammar_file = configure_file(input : 'grammar.y.in',
output : 'grammar.y',
configuration : bison_parser_cdata)
bison_cdata.set('BISON', bison.path())
bison_cdata.set('BISON_ARGS', '')
@ -61,7 +70,7 @@ parser = custom_target('parselex',
)
grammar = custom_target('parsegrammar',
input : 'grammar.y',
input : gen_grammar_file,
output : ['grammar.tab.c', 'grammar.tab.h'],
command : [python3, gen_grammar, '@OUTPUT0@', '@OUTPUT1@', '@INPUT@'],
depends : [parser],