Re: [Boost-testing] [dramatec] qcc-3.3.5-gpp: what std lib?

From: Jim Douglas (jim_at_[hidden])
Date: 2006-01-09 05:20:10

Eric Niebler wrote:
> Jim Douglas wrote:
> 
> I'm confused. qcc/gcc is using the GNU libs, right? Do you mean 
> __GLIBCPP__ and _CPPLIB_VER are defined but __GLIBC__ is not? How odd.

I don't speak from authority, but my understanding is that there is only 
one common core C library and this is unique to QNX. This C library 
provides the foundation for both the GNU and Dinkum C++ standard 
libraries. So it is correct that '__GLIBC__' is undefined. In this case 
you should look for '__QNXNTO__' instead, because that will tell you 
what lies at the heart of the system.

IMHO QNX's big mistake is to define _CPPLIB_VER when using the GNU 
library. I will try to get them to correct this.

The introduction of QNX6 to Boost has resulted in the slaughter of many 
sacred cows:-) You seem to be assuming that the parts of the C++ library 
that provide the C functionality _must_ both be from the same supplier. 
  Similarly many Boost developers have assumed that if you are using the 
GNU compiler i.e. __GNUC__ is defined, then you _must_ be using the GNU 
C++ library. Not so...

You can't assume anything with QNX as they adopt a mix-and-match 
approach. It ships with two versions of gcc (2.95.3 & 3.3.5) each with 
its associated GNU C++ std lib, but both compilers can use a common 
Dinkum C++ std lib. You can even use the Intel compiler in place of the 
GNU compiler when you are cross-developing on Windows.

> Every version of the Dinkumware std lib that has ever shipped with 
> Visual C++ has these, AFAIK. They are in ctype.h, and they are sadly 
> non-standard. That's because, while iswctype() is standard, there is no 
> narrow-char equivalent. Most std libs provide one anyway, but each one 
> does it differently. GLIBC has __isctype() and _ISalpha, _ISdigit, etc., 
> VC++ has _isctype() and _ALPHA, _DIGIT, etc., Cygwin has yet another 
> variant, MinGW another, etc.
> 
> So does qcc have something like this in its ctype.h?
> 

I think this is what you need - taken from ctype.h:

                /* _Ctype code bits */
#define _XB		0x400 /* extra blank */
#define _XA		0x200 /* extra alphabetic */
#define _XS		0x100 /* extra space */
#define _BB		0x80 /* BEL, BS, etc. */
#define _CN		0x40 /* CR, FF, HT, NL, VT */
#define _DI		0x20 /* '0'-'9' */
#define _LO		0x10 /* 'a'-'z' */
#define _PU		0x08 /* punctuation */
#define _SP		0x04 /* space */
#define _UP		0x02 /* 'A'-'Z' */
#define _XD		0x01 /* '0'-'9', 'A'-'F', 'a'-'f' */

It seems to use a variable of type short i.e. 16 bits.

There is also a set of ANSI & POSIX 1003.1 functions isalpha(), 
iswalpha() etc. that work with narrow and wide characters. Are they of 
any use?

If that is not enough information I can mail you the complete header file.

The above definitions are referenced by both the GNU and Dinkum C++ 
libraries, so I guess you will have to use the #if defined(__QNXNTO__) 
test after all.

HTH - Jim