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Add rationale comments for conditional yyparse redefinition

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Viktor Dukhovni
2017-03-15 18:50:55 -04:00
committed by Viktor Dukhovni
parent 008a26c489
commit 14135e90aa
1 changed files with 14 additions and 0 deletions
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14
lib/hx509/sel.h
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@@ -67,6 +67,20 @@ struct hx_expr_input {
extern struct hx_expr_input _hx509_expr_input; extern struct hx_expr_input _hx509_expr_input;
/*
* With bison/flex, the more modern way to allow multiple yacc/lex grammars to
* be linked into a single executable is to use the
*
* bison: -p, --name-prefix=,PREFIX/, -Dapi.prefix=PREFIX
* flex: -Pprefix, --prefix=STRING
*
* options, these take care of renaming all the machine-generated global entry
* points, some of which are new. When these options are used "yylex",
* "yyparse", ... are already defined and our (potentially incomplete) attempt
* to do the same conflicts with the "right" new way to handle this. The below
* logic gets us out of the way when the job has already been taken care of by
* the parser-generator.
*/
#if !defined(yylex) #if !defined(yylex)
#define yylex _hx509_sel_yylex #define yylex _hx509_sel_yylex
#define yywrap _hx509_sel_yywrap #define yywrap _hx509_sel_yywrap