On Mon Mar 13, 2000 at 04:44:16PM +0500, Tiger wrote:
> Can some one explain what exactly it does __attribute__ and what is
> noretun
gcc uses "__attribute__" to specify compiler directives instead of the
traditional "#pragma" since #pragma behaviors are totally unportable and cannot
be placed into macros. Consider this code:
#include<stdlib.h>
#include <stdio.h>
__attribute__ ((noreturn)) void message1(const char *msg)
{
printf(msg);
exit(0);
}
int main( void)
{
message1("Hello\n");
}
Without the __attribute__ ((noreturn)), the compiler would complain that
"control reaches end of non-void function" in main(). By using the attribute
we can give the compiler the hint that control will never go back to main(),
and it doesn't need to give a warning.
-Erik
--
Erik B. Andersen Web: http://www.xmission.com/~andersen/
email: andersee@debian.org
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