Re: c: don't assume that UCHAR_MAX, etc. are defined

[Paul Eggert]

I installed the attached, which should fix the problem in a better way.

On RHEL 7.7 (GCC 4.8.5 20150623 (Red Hat 4.8.5-39)), 'make check' is now 
outputting the following; although this is unrelated to the UCHAR_MAX 
problem and doesn't break the build, I thought you might like to know. 
The first diagnostic is C-related, the second C++.


  CC       examples/c/reccalc/reccalc-scan.o
examples/c/reccalc/scan.c: In function 'yy_fatal_error':
examples/c/reccalc/scan.c:1648:58: warning: unused parameter 'yyscanner' 
[-Wunused-parameter]
 static void yy_fatal_error (yyconst char* msg , yyscan_t yyscanner)
                                                          ^
examples/c/reccalc/scan.c: In function 'yyalloc':
examples/c/reccalc/scan.c:1968:43: warning: unused parameter 'yyscanner' 
[-Wunused-parameter]
 void *yyalloc (yy_size_t  size , yyscan_t yyscanner)
                                           ^
examples/c/reccalc/scan.c: In function 'yyrealloc':
examples/c/reccalc/scan.c:1973:58: warning: unused parameter 'yyscanner' 
[-Wunused-parameter]
 void *yyrealloc  (void * ptr, yy_size_t  size , yyscan_t yyscanner)
                                                          ^
examples/c/reccalc/scan.c: In function 'yyfree':
examples/c/reccalc/scan.c:1985:36: warning: unused parameter 'yyscanner' 
[-Wunused-parameter]
 void yyfree (void * ptr , yyscan_t yyscanner)
                                    ^
...
  CXX      examples/c++/calc++/calc__-driver.o
./doc/bison.texi: In member function 'int driver::parse(const string&)':
./doc/bison.texi:12034:20: warning: declaration of 'parse' shadows a 
member of 'this' [-Wshadow]
   yy::parser parse (*this);
                    ^
  LEX      examples/c++/calc++/scanner.cc
  CXX      examples/c++/calc++/calc__-scanner.o
examples/c++/calc++/scanner.cc:314:44: warning: zero as null pointer 
constant [-Wzero-as-null-pointer-constant]
 static YY_BUFFER_STATE * yy_buffer_stack = 0; /**< Stack as an array. */
                                            ^
examples/c++/calc++/scanner.cc:346:36: warning: zero as null pointer 
constant [-Wzero-as-null-pointer-constant]
 static char *yy_c_buf_p = (char *) 0;
                                    ^
examples/c++/calc++/scanner.cc:416:23: warning: zero as null pointer 
constant [-Wzero-as-null-pointer-constant]
 FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
                       ^
examples/c++/calc++/scanner.cc:416:44: warning: zero as null pointer 
constant [-Wzero-as-null-pointer-constant]
 FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
                                            ^