redefining malloc and free throw exceptions in bison 2.1

[Shane Mueller]

Hi,

I have a project for which I was using bison 2.0 successfully in a C++
project, using the following commands in my Makefile:

  bison -d $(BASE_DIR)/grammar.y -o $(BASE_DIR)/grammar.tab.cpp
  flex -o$(BASE_DIR)/lex.yy.c  $(BASE_DIR)/Pebl.l

BTW, I'm using g++ (GCC) 4.0.3 (Ubuntu 4.0.3-1ubuntu5) and Ubuntu's
precompiled bison/yacc tools as well. I haven't re-generated the parser
in a while, and when I did recently (after upgrading to bison 2.1), I
get the following compile-time errors:

g++ -g -O3  -Wno-deprecated -Wall -pedantic -DPEBL_UNIX  -c
src/base/grammar.tab.cpp -o obj/src/base/grammar.tab.o
-I/usr/include/SDL -D_REENTRANT
src/base/grammar.tab.cpp:312: error: declaration of 'void*
malloc(unsigned int)' throws different exceptions
/usr/include/stdlib.h:584: error: than previous declaration 'void*
malloc(unsigned int) throw ()'
src/base/grammar.tab.cpp:319: error: declaration of 'void free(void*)'
throws different exceptions
/usr/include/stdlib.h:597: error: than previous declaration 'void
free(void*) throw ()'

The relevant lines from the new grammar.tab.cpp, most of which don't
appear in the older version:
 
# ifdef YYSTACK_ALLOC
   /* Pacify GCC's `empty if-body' warning. */
#  define YYSTACK_FREE(Ptr) do { /* empty */; } while (0)
#  ifndef YYSTACK_ALLOC_MAXIMUM
    /* The OS might guarantee only one guard page at the bottom of the stack,
       and a page size can be as small as 4096 bytes.  So we cannot safely
       invoke alloca (N) if N exceeds 4096.  Use a slightly smaller number
       to allow for a few compiler-allocated temporary stack slots.  */
#   define YYSTACK_ALLOC_MAXIMUM 4032 /* reasonable circa 2005 */
#  endif
# else
#  define YYSTACK_ALLOC YYMALLOC
#  define YYSTACK_FREE YYFREE
#  ifndef YYSTACK_ALLOC_MAXIMUM
#   define YYSTACK_ALLOC_MAXIMUM ((YYSIZE_T) -1)
#  endif
#  ifdef __cplusplus
extern "C" {
#  endif
#  ifndef YYMALLOC
#   define YYMALLOC malloc
#   if (! defined (malloc) && ! defined (YYINCLUDED_STDLIB_H) \
        && (defined (__STDC__) || defined (__cplusplus)))
void *malloc (YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
#   endif
#  endif
#  ifndef YYFREE
#   define YYFREE free
#   if (! defined (free) && ! defined (YYINCLUDED_STDLIB_H) \
        && (defined (__STDC__) || defined (__cplusplus)))
void free (void *); /* INFRINGES ON USER NAME SPACE */
#   endif
#  endif
#  ifdef __cplusplus
}
#  endif
# endif
#endif /* ! defined (yyoverflow) || YYERROR_VERBOSE */

I guess this has something trying to use a c-generated parser in a C++
project, and the new improved support for C++ in bison?  Note that
grammar.y contains C++ code (defining pointers to classes with new,
etc.), so I can't just compile with gcc.  This seems like a bug, but I'm
not familiar enough with bison to tell for sure.  I can't find any
documentation on this behavior.  Is there a work-around or easy fix
other than reverting to bison 2.0?

Thanks