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m4: use a safer pattern to enable/disable output

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Work on some other areas of Bison revealed that some macros expanded
to be expanded only once were actually expanded several times.  This
was due to the fact that changecom was not properly restored each
time, and macro names appearing in comments were then expanded.

Introduce begin/end macros which are easier to match that
changecom()/changecom(#).

* data/bison.m4 (b4_output_begin, b4_output_end): New.
* data/glr.c, data/glr.cc, data/lalr1.cc, data/lalr1.java,
* data/location.cc, data/stack.hh, data/yacc.c:
Use them.
This commit is contained in:
Akim Demaille
2012-12-03 15:29:44 +01:00
parent 6ee95cd0d9
commit 1c7ec959b1
8 changed files with 64 additions and 48 deletions
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11
data/stack.hh
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@@ -18,10 +18,7 @@
m4_pushdef([b4_copyright_years],
[2002-2012])
# We do want M4 expansion after # for CPP macros.
m4_changecom()
m4_divert_push(0)dnl
@output(b4_dir_prefix[]stack.hh@)@
b4_output_begin([b4_dir_prefix[]stack.hh])
b4_copyright([Stack handling for Bison parsers in C++],
[2002-2012])[
@@ -119,6 +116,6 @@ b4_copyright([Stack handling for Bison parsers in C++],
]b4_namespace_close[
]b4_cpp_guard_close([b4_dir_prefix[]stack.hh])
m4_divert_pop(0)
m4_popdef([b4_copyright_years])dnl
m4_changecom([#])
b4_output_end()
m4_popdef([b4_copyright_years])