c/1538: cannot compile with #include <sys/varargs.h>

[garrett@damore.org]

>Number:         1538
>Category:       c
>Synopsis:       cannot compile with #include <sys/varargs.h>
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 02 16:26:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Garrett D'Amore
>Release:        2.95.2 19991024 (release)
>Organization:
>Environment:
Solaris 8, i386.  (i386-pc-solaris2.8)
>Description:
Some device driver sources #include <sys/varargs.h>.  This
makes it impossible to compile them with vanilla gcc.
The problem is that <sys/varargs.h> is pretty much the
same as <stdarg.h> for kernel sources on Solaris -- it
refers to compiler built-in features for variable length
arg-lists.
>How-To-Repeat:
Try compiling any driver source that uses the <sys/varargs.h>
interface (which is documented in the Sun DDK.)  I've
included a file that compiles properly with Sun cc, but
fails with gcc.  (Use cc -D_KERNEL -c).
>Fix:
The best solution is to have the gcc private include files
bundle a version of <sys/varargs.h> -- this should follow
the same semantics as <stdarg.h>.  Actually, my solution
was to put a file that said "#include <stdarg.h>" into
this location:

/usr/local/lib/gcc-lib/i386-pc-solaris2.8/2.95.2/include/sys/varargs.h

Note that <sys/varargs.h> on Solaris follows the conventions
for ANSI varargs, not the old K&R rules, even though it is
named using <sys/varargs.h> instead of <sys/stdarg.h> (which
might have been more logical.)

When I made this change, I was able to compile driver sources
on Solaris 8 using gcc without difficulty.
>Release-Note:
>Audit-Trail:
>Unformatted:
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