segmentation fault ?

This is a discussion on segmentation fault ? within the C++ Programming forums, part of the General Programming Boards category; if we construct anonymous static union ,at file scope my compiler(gcc) gives error:segmentation fault why this is so! Code: static ...

  1. #1
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    Talking 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?
    Last edited by hr1212s; 05-11-2010 at 10:19 AM.

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    It's [/code] not [\code].
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
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  3. #3
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    Your code doesn't make any sense. A static union definition that is never used? Although, it doesn't crash for me.

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    I don't get a segmentation fault..

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    Quote Originally Posted by Brafil View Post
    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?

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    C++ Witch laserlight's Avatar
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    So, you are saying that this simplified program demonstrates the problem?
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    Quote Originally Posted by laserlight View Post
    So, you are saying that this simplified program demonstrates the problem?
    yes it gives me error

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    spurious conceit MK27's Avatar
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    Quote Originally Posted by hr1212s View Post
    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"?

    Quote Originally Posted by hr1212s View Post
    yes it gives me error
    What error?
    Last edited by MK27; 05-11-2010 at 10:25 AM.
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    C++ Witch laserlight's Avatar
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    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.
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    Quote Originally Posted by laserlight View Post
    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.

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    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

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    Cool

    Quote Originally Posted by laserlight View Post
    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.

  13. #13
    and the Hat of Guessing tabstop's Avatar
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    Quote Originally Posted by hr1212s View Post
    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)

  14. #14
    spurious conceit MK27's Avatar
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    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.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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    Registered User jeffcobb's Avatar
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    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?
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