[Info-vax] Color me confused (VMS C issues, this time with %zu)

[Richard Levitte]

I'm a little confused...  The VMS C manual [1] states that:

-----8<-----
It also provides complete language support for ISO/IEC 9899:1999, informally called C99, although not all run-time library routines are currently implemented, floating-point environment access controls are not effective, and Annex F (the optional __STDC_IEC_559__ extension) is not supported.
-----8<-----

And sure enough, __STDC_VERSION__ is 199901L.

And yet, this fails to run properly:

-----8<-----
#include <stdio.h>

#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
# define zu "zu"
#else
# define zu "llu"
#endif

int main()
{
    size_t foo = 1;

    printf("__STDC_VERSION__ is %lu\n", __STDC_VERSION__);
    printf("zu is '%s'\n", zu);
    printf("foo is %" zu "\n", foo);
}
-----8<-----

See this session:

-----8<-----
$ cc/version
HP C V7.3-018 on OpenVMS IA64 V8.4    
$ cc foo.c

    printf("foo is %" zu "\n", foo);
...............................^
%CC-W-UNSUPCONVSPEC, In this statement, this argument to printf has a conversion
 specification "%zu" that is not supported or not fully supported on this platfo
rm.
at line number 15 in file PROGRAM:[LEVITTE-BUILDS.OPENSSL-EXPERIMENTAL.IA64]FOO.
C;4
$ link foo
%ILINK-W-COMPWARN, compilation warnings
	module: FOO 
	file: PROGRAM:[LEVITTE-BUILDS.OPENSSL-EXPERIMENTAL.IA64]FOO.OBJ;4 
$ run foo
__STDC_VERSION__ is 199901
zu is 'zu'
foo is zu
-----8<-----

As far as I know, %zu isa C99 feature and not part of Annex F, so for a compiler that "provides complete language support for ISO/IEC 9899:1999", this leads to fairly ackward preprocessor conditions specially for VMS.

Or really, the the compiler doesn't provide complete language support for C99, should it pretend it does?

Cheers,
Richard