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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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8
data/c.m4
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@@ -36,13 +36,15 @@ m4_define([b4_cpp_guard],
# b4_cpp_guard_open(FILE)
# b4_cpp_guard_close(FILE)
# ------------------------
# Open/close CPP inclusion guards for FILE.
# If FILE does not expand to nothing, open/close CPP inclusion guards for FILE.
m4_define([b4_cpp_guard_open],
[m4_ifval(m4_quote($1),
[#ifndef b4_cpp_guard([$1])
# define b4_cpp_guard([$1])])
# define b4_cpp_guard([$1])])])
m4_define([b4_cpp_guard_close],
[#endif b4_comment([!b4_cpp_guard([$1])])])
[m4_ifval(m4_quote($1),
[#endif b4_comment([!b4_cpp_guard([$1])])])])
## ---------------- ##