OracleSolaris 11.2 -- simple file I/O, cc warning - file-io

Question

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(void)
{
int fd;
fd = open("abc.txt", O_RDONLY);
if (fd < 0)
{
exit(EXIT_FAILURE);
}
printf("fd %d\n", fd);
close(fd);
exit(EXIT_SUCCESS);
}
Now I build it:
$ cc -errwarn=%all -o ~/tmp/aa ~/tmp/a.c
warning: bad message tag: /export/home/rmashak/tmp/a.call
$ cc -V
cc: Sun C 5.12 SunOS_i386 2011/11/16
It does execute fine, but what's the warning all about?

Answer 1

I have insufficient reputation to add a comment... This does look like a compiler bug with the parser. Compiling with later version of cc does not produce this error.
$ cc -V
cc: Sun C 5.13 SunOS_i386 2014/10/20
$ cc -errwarn=%all -o ~/tmp/aa ~/tmp/a.c
$
In your output cc appears to have presented the source filename concatenated with the remainder of '-errwarn' tag 'all', odd!

Answer 2

The error means that you have passed an unrecognized option to -errwarn:
% cc -errwarn=%mumblefrotz -o hello hello.c
warning: bad message tag: %mumblefrotz
It appears your shell somehow converted the % in your command into /export/home/rmashak/tmp/a.c before passing it to the compiler. It looks like some shells such as zsh may expand % signs specially in command processing - check the docs for whichever shell you use.
If you're using recent versions of Solaris Studio, the % is optional to avoid problems like this - you can change your command instead to be:
cc -errwarn=all -o ~/tmp/aa ~/tmp/a.c