🚀 go-pugleaf

Gentle Readers,

	While attempting to compile libg++-2.2 with gcc-2.2.2 on a 
DECstation 5000/240 (and DECstation 5000/125) running Ug^Hltrix4.2A, I came
across the following:

>Script started on Mon Jul 20 15:02:17 1992
>94 rooney>gmake
>gmake[1]: Nothing to be done for `all'.
>/local/sys/src/libg++-2.2/libg++/../gcc/gcc -B/local/sys/src/libg++-2.2/libg++/../gcc/ -g  -I. -I.. -I. -I./../src -I./../g++-include -c -I/local/sys/src/libg++-2.2/libg++/../gcc/include sbufvform.C
>sbufvform.C: In method `int  streambuf::vform (const char *, char *)':
>sbufvform.C:248: warning: implicit declaration of function `__builtin_alignof'
>sbufvform.C:248: parse error before `4'
>sbufvform.C:248: parse error before `4'
>sbufvform.C:248: parse error before `['
>#...
>#similarly for lines 260, 300, 309, 323,370, 380, 392, 398, 422, 427
>#...
>gmake[1]: *** [sbufvform.o] Error 1
>gmake: *** [in-io] Error 1
>95 rooney>^D
>script done on Mon Jul 20 15:02:27 1992

I have traced this to the macro expansion of va_arg in /usr/include/stdarg.h,
which looks like this:

>        /* va_arg aligns list and points past data */
>#define va_arg(list, mode) ((mode *)(list =\
> (va_list) ((((int)list + (__builtin_alignof(mode)<=4?3:7)) &\
> (__builtin_alignof(mode)<=4?-4:-8))+sizeof(mode))))[-1]

which results in line 248 of sbufvform.C being translated into:

>			if ((width =  ((int *)(ap = (va_list) ((((int)ap + (__builtin_alignof(int)<=4?3:7)) & (__builtin_alignof(int)<=4?-4:-8))+sizeof(int))))[-1]) >= 0)

The implicit declaration error is (I believe) because the 'ccom' part of DEC's
C compiler contains '__builtin_alignof' (detected via a 'strings'), while
gcc/g++ does not.  The string appears in no other part of the compiler, nor
in any other file under /usr/include[/sys].

a) Am I doing anything wrong?
b) I expect the problem is the way DEC has their stdarg.h written (go figure).
   Is this inconsistent with other OS's stdarg.h's? (I have no other boxes
   to compare to)
c) Any clues?  Anyone?

|  . . ) /   | It breathes fire. -more-  | Jim Niemira
| (_(_/  |   | It breathes fire. -more-  | Senior SysOp, Frontier Sci
|    (   '   | You are not happy. -more- | niemira@karloff.fstrf.org