Steps To Troubleshoot Gcc Error Forwarding Issue

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    If you see a gcc transfer error report, this guide may help you.

    After a few hours of experimentation, this situation turned out to be a limitation of GCC. Newer CCGs do not have this problem.

    1. Not Yet ( May_alias Misbehavior)

    gcc error forward declaration of

      #include struct MyType; // Pass the declaration here if may_alias does not exist.void foo (struct MyType *, int * b);structure fast montype a;; // Complete definition of the next one without may_alias.void f (struct MyType * my_type, int * b)    * b is 1;    my_type-> a is 0;    appetizer (* b == 1)       Printf ("Serious alias problem  n");    int main (empty)    intb;    f ((struct MyType *) & b, & b);    Return 0;Gcc 
      $ -O2 -o main main.c$ ./mainSerious alias problem 

    2. No Direct Declaration, No May_alias (bad Behavior)

    3. Declaration Continues, May_alias (not Compiled)

      struct __attribute __ ((may_alias)) MyType; // Move the declaration here using may_alias.struct __attribute __ ((may_alias)) pretty short mytype a;; // Full definition is correct, with may_alias.Gcc 
      $ -O2 -o essentially main.cmain.c: 11:10: error: conflicting types generate "foo"    Void foo (struct MyType * my_type, int * b)          ^main.c: 5:10: Note: statement that previously contained"foo" was here     void foo (struct MyType *, int * b); 

    Apparently GCC thinks struct MyType; is a different type. However, I have not found a way to extend the may_alias attribute to a direct declaration. According to the order form:


    gcc error forward declaration of

    This is greatly ignored when the contents of a struct, union, or enumeration form are not defined in the particular specifier that the spec attribute mailing list is used for, i.e. in cases like the bar struct ((foo)) attribute with no chance after the opening parenthesis.

      void foo (struct MyType __attribute __ ((may_alias)) *, int * b); 

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    However, this is far from the best solution, as the syntax may not yet be supported:

    Note again that this definitely does not work for most attributes; For example, the use of the above “aligned” and “not rotated” attributes is not yet supported.

      $ gcc -O2 -o main.main.c$ ./mainSerious alias problem 

    4. No Declaration, May_alias Gcc (good)

      $ -O2 -i main main.c$ ./main$ 

    In my situation, however, a declaration of delivery is required. My solution is to use void * instead of struct MyType * for most of them:

      // In some .h file there is no definition of MyType yet.void foo (void Int * my_type, * b);// Contains the description of MyType in the .c file.void foo (void Int * t, * b)    struct MyType * my_type = t;    // ... 

    It's not so pretty, but now they can only work like this.

    I'm worried about porting some laws heavily based on models that I wrote with MS Visual Tattoo Studio to compile and run gcc. In my complex archive of headers, there are several classes that reference each other. This is not a C ++ problem in music theory, as you should always be able to use the new "before declaration" in the title.

    For example, I took this from the site
    http://www.devx.com/tips/Tip/12583

    Well this was not a compilation practice, so I changed it a bit until it was compiled using MS Visual Studio. This is probably the result:

    Code:

     // file: bank.hnumber of classes; // Shipping declarationExcellent reportGeneral:// good: we know the account has a class that hasn't been defined yetinvalid withdrawal (permanent accountRegister and account) ;Classify; Checkthe reporter;General:Blank ads ()rep.Main (int output (* this);;int argc, char * argv [])Account A;Report R;output R. (A);

    Good. Studio 2005 compiles this, but gcc 4.3.0 always returns an error:
    test2.cpp: 13: impossible to go wrong: call the member function u2018void Report :: Output (const Account &) u2019 not applicable

    In the actual code I am trying to compile with gcc, I have something like this:

    Code:

     // pre-declarationDynamic class;pattern Leader of the class;Model class matrix;model protected:int issub;General:Float * val;/ * Creation from dynamic matrix * /rmatrix (dynmatrix & dm)// Property maintenance code// even more} - - // Exit the rmatrix class// real Dynmatrix codegreat dinamatrisprotected:int issub;General:Float * val; // ...// encode people linking to rmatrix. refermodel dynmatrix (rmatrix  & cm): nrows (no), ncols (nc), ld (uld)mtype = real matrix;val means cm.tohost (); ; // Remove the dymmatrix class 

    This code is giving me errors in terms of terms, namely

    matrix.h:constructor in u2018rmatrix :: rmatrix (dynmatrix &) u2019:
    matrix.h: 406: error: Invalid use not entirely related to type u2018struct dynmatrix u2019
    matrix.h: 80: Error: direct instruction u2018struct from dynmatrix u2019

    The first flaw is most likely in the rmatrix constructor, which creates the dynmatrix argument, and the second in its own direct declaration.

    If you cannot try extended declarations in gcc 4 now, it will destroy a huge amount of code. Is there a specific type of work?

     // file: get bank.hnumber of classes; // Shipping declarationExcellent reportGeneral:// good: account is known to be a specific class, not yet definedinvalid withdrawal (persistent account and account) ;Class - accountthe reporter;General:Blank ads ()rep.Main (int output (* this);;int argc, char * argv [])Account A;Report R;output R. (A);
     // some clarification by emailDynamic class;Model Leader of the class;Model class matrix;model protected:int issub;General:Float * val;/ * Stswarm from another dynamic matrix * /rmatrix (dynmatrix & dm)// Build the code// a lot more ; things} // complete rmatrix class// current Dynmatrix codegreat dinamatrisprotected:int issub;General:Float * val; // ...// code for rmatrix resourcesmodel dynmatrix (rmatrix  & cm): nrows (no), ncols (nc), ld (uld)mtype is equal to the real matrix;val = cm.tohost ();  , // end of dynamic matrix 

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