I can't compile in the constants LLONG_MIN, LLONG_MAX, or ULLONG_MAX. 
These are defined in the system doc for strtoll and strtoull, and
appear to be in limits.h, but the compiler won't recognize them (due
to layers of #ifdefs).  If I turn on -std=c99, it will give me the
constants, but it messes everything else up.

I've come up with a workaround, so I don't need that.  I'm trying to
understand if this is a g++ bug, or if I'm doing something wrong.

I've got a Redhat Linux Workstation 3 system which I'm running c++ on.
I've got all the latest patches from redhat, and I'm running kernel
version  2.4.21-9.0.1.EL.
g++ version info:
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=i386-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-24)

By default, gcc compiles C++ code in 'gnu++98' mode, which is an
implementation of the 1998 ISO C++ standard (as amended) and GNU
extensions. gcc also supports a 'c++98' mode which is strictly the
1998 ISO C++ standard.

Because the long long type (and it's associated minimum and maximum
constants) wasn't introduced to the C language until 1999, the 1998
C++ standard doesn't include them.

Thus, it's perfectly fine (although annoying) for gcc to hide
LLONG_MIN and company from C++ programs.

The next revision of the C++ has largely incorporated the C99 changes,
but that won't help you until the standard is finalized, gcc has
implemented it, and you've upgraded to a version of RHEL that includes
the new gcc.

Until then (or, preferrably forever, from a C++ correctness
standpoint), use the  min() and max() methods of the
std::numeric_limits<long long> and std::numeric_limits<unsigned long
long> classes.

For example:

#include <limits>
#include <iostream>
 
using namespace std;
 
int main(int argc, char* argv[])
{
        numeric_limits<long long> ll;
        numeric_limits<unsigned long long> ull;
 
        cout    << "long long minimum: "                << ll.min()     << endl
                << "long long maximum: "                << ll.max()     << endl
                << "unsigned long long minimum: "       << ull.min()    << endl
                << "unsigned long long maximum: "       << ull.max()    << endl; 
        return 0;
}