segmentation fault ?

if we construct anonymous static union ,at file scope my compiler(gcc) gives error:segmentation fault
why this is so!

Code:

static union{int a;};

int main()
{
    return 0;
}

it is simplified code,
i'm using code::blocks 8.02 (it uses gcc).
is it non standard thing or it's my compiler's fault?

It's [/code] not [\code].

Your code doesn't make any sense. A static union definition that is never used? Although, it doesn't crash for me.

I don't get a segmentation fault..

Originally Posted by Brafil

Your code doesn't make any sense. A static union definition that is never used? Although, it doesn't crash for me.

it is simplified code,
i'm using code::blocks 8.02 . is it non standard thing or it's my compiler's fault?

So, you are saying that this simplified program demonstrates the problem?

Originally Posted by laserlight

So, you are saying that this simplified program demonstrates the problem?

yes it gives me error

Originally Posted by hr1212s

it is simplified code,
i'm using code::blocks 8.02 . is it non standard thing or it's my compiler's fault?

It compiles and runs fine with gcc 4.3.2 (and g++).

Are you talking about the "simplified" code example, or the "real code"?

Originally Posted by hr1212s

yes it gives me error

What error?

Oh, now I understand. I originally tried using the same compiler that is bundled with one Code Blocks installation package, but did not see any problem when I lazily compiled with no options.

Now, I compiled with -Wall and -pedantic, and discovered that with -Wall the compiler has an internal error in which the error message states a segmentation fault with involved. The answer to your question is given right there: you are looking at a genuine compiler bug.

Originally Posted by laserlight

Oh, now I understand. I originally tried using the same compiler that is bundled with one Code Blocks installation package, but did not see any problem when I lazily compiled with no options.

Now, I compiled with -Wall and -pedantic, and discovered that with -Wall the compiler has an internal error in which the error message states a segmentation fault with involved. The answer to your question is given right there: you are looking at a genuine compiler bug.

Yes, I agree. In fact, any segfault from any program is a bug in the specific program. So even if your code is buggy as hell; if it makes the compiler crash, it's a problem on the compiler's side. It should in stead produce meaningful error messages on what you did wrong.

oh thanks guys,
during this i found link Anonymous Union
which point to same conclusion that, this code is fine and error is bug of compiler

Originally Posted by laserlight

Oh, now I understand. I originally tried using the same compiler that is bundled with one Code Blocks installation package, but did not see any problem when I lazily compiled with no options.

Now, I compiled with -Wall and -pedantic, and discovered that with -Wall the compiler has an internal error in which the error message states a segmentation fault with involved. The answer to your question is given right there: you are looking at a genuine compiler bug.

hey ,will you please give some idea about what -Wall and -pedantic does in code::blocks !
i haven't find it on google.

Originally Posted by hr1212s

hey ,will you please give some idea about what -Wall and -pedantic does in code::blocks !
i haven't find it on google.

GCC online documentation - GNU Project - Free Software Foundation (FSF)

I guess you should upgrade your gcc, as I said there is no problem with 4.3.2, which is several years old (I think the current one is 4.4).

-Wall is very useful, there must be some setting in Code::Blocks to turn this on by default.

Actually I am still stuck trying to figure out what the point of a union with only one member could be...is this a result of the code simplification?