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Date: Tue, 10 Feb 2004 21:59:15 +0800 (SGT)
From: Jeff Chua <jchua@fedex.com>
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To: Andrew Morton <akpm@osdl.org>
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Subject: Re: [PATCH] warning: `__attribute_used__' redefined
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On Mon, 9 Feb 2004, Andrew Morton wrote:

> It is more likely that we need to extend the __KERNEL__ coverage somewhere.
>
> Can you please do a `gcc -H' of that application and show us the inclusion
> route by which it is hitting compiler.h?

Andrew,

Here's the sample "sig.c". Just compile with "cc sig.c"



#include <signal.h>	/* signal */
#include <stdio.h>	/* printf */

void action(int signum);

int main(int argc, char *argv[])
{
	int i;
	for(i = 1; i < 31; i++) {
		if(i == 9 || i == 19)
			continue;

		signal(i, action);
	}
}

void action(int signum)
{
	printf("%d\n", signum);
}




Here's output of "gcc -H sig.c" gcc 2.95.3  glibc 2.2.5  linux 2.6.3-rc2


/usr/include/signal.h
 /usr/include/features.h
  /usr/include/sys/cdefs.h
  /usr/include/gnu/stubs.h
 /usr/include/bits/sigset.h
 /usr/include/bits/types.h
  /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stddef.h
  /usr/include/bits/pthreadtypes.h
   /usr/include/bits/sched.h
 /usr/include/bits/signum.h
 /usr/include/time.h
 /usr/include/bits/siginfo.h
  /usr/include/bits/wordsize.h
 /usr/include/bits/sigaction.h
 /usr/include/bits/sigcontext.h
  /usr/include/asm/sigcontext.h
   /usr/include/linux/compiler.h
    /usr/include/linux/compiler-gcc2.h
     /usr/include/linux/compiler-gcc.h
In file included from /usr/include/linux/compiler.h:18,
                 from /usr/include/asm/sigcontext.h:4,
                 from /usr/include/bits/sigcontext.h:28,
                 from /usr/include/signal.h:307,
                 from sig.c:1:
/usr/include/linux/compiler-gcc2.h:21: warning: `__attribute_used__' redefined
/usr/include/sys/cdefs.h:170: warning: this is the location of the previous definition
 /usr/include/bits/sigstack.h
 /usr/include/bits/sigthread.h
/usr/include/stdio.h
 /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stddef.h
 /usr/include/libio.h
  /usr/include/_G_config.h
   /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stddef.h
   /usr/include/wchar.h
    /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stddef.h
    /usr/include/bits/wchar.h
   /usr/include/gconv.h
    /usr/include/wchar.h
     /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stddef.h
    /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stddef.h
  /usr/lib/gcc-lib/i586-pc-linux-gnu/2.95.3/include/stdarg.h
 /usr/include/bits/stdio_lim.h


Thanks,
Jeff