[Bug-ocrad] Some compatibility issues

[Elmar Plischke]

Hello there!

I've just compiled ocrad under SUN/Solaris using the native compiler.
However, there are some minor issues to report:

configure/Makefile combo does not respect the CXX and CXXFLAGS environment 
variables. Maybe it's time to use some autoconf-magic. A good start seems to be
http://sources.redhat.com/autobook/

So, after some manual Makefile hacking, I've found the following GNUisms

The lines 

void ...error( const char * msg ) throw() __attribute__ ((noreturn));

in common.h, rectangle.cc and track.cc should be protected by an
#ifdef _GNUC__/#endif pair

In main.cc, note that <getopt.h>, getopt_long() are GNU, the standard lib 
offers only an interface via

int getopt(int argc, char * const *argv,  const  char  *opt-
     string);
     extern char *optarg;
     extern int optind, opterr, optopt;

One more to go:
snprintf() seems to be part of C99, but (Sun) C++ has no wrapper for it.
I circumvented this problem by using a format string with a precision argument, 
so that the string is truncated by sprintf. It now reads
in main.cc

void Ocrad::internal_error( const char * msg ) throw()
  {
  char buf[80];
#ifdef __GNUC__     
  std::snprintf( buf, sizeof( buf ), "internal error: %s.\n", msg );
#else
  std:sprintf( buf, "internal error: %.60s.\n", msg );
#endif     
  show_error( buf );
  exit( 3 );
  }

Best regards,
        Elmar Plischke