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yacc: fix handling of CPP guards when no header is generated

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When no header was to be generated, Bison would issue:

  /* In a future release of Bison, this section will be replaced
     by #include "".  */
  #ifndef YY_
  # define YY_

It now properly generates nothing.

* data/c.m4 (b4_cpp_guard_open, b4_cpp_guard_close): Issue nothing when
the file name is empty.
* data/yacc.c: Do not generate the above comment when there is no header
to generate.
* NEWS: Update.
This commit is contained in:
Akim Demaille
2012-09-21 11:10:37 +02:00
parent 53425dbfaa
commit 6b4cb804b5
3 changed files with 20 additions and 5 deletions
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6
data/yacc.c
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@@ -345,9 +345,11 @@ m4_if(b4_api_prefix, [yy], [],
# define YYERROR_VERBOSE ]b4_error_verbose_flag[
#endif
/* In a future release of Bison, this section will be replaced
]m4_ifval(m4_quote(b4_spec_defines_file),
[[/* In a future release of Bison, this section will be replaced
by #include "@basename(]b4_spec_defines_file[@)". */
]b4_shared_declarations[
]])dnl
b4_shared_declarations[
/* Copy the second part of user declarations. */
]b4_user_post_prologue