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LI76220: INCORRECT SIZEOF ENUM FOR LARGE INTEGERS

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APAR status

  • Closed as program error.

Error description

  • For the below test case, xlC is producing incorrect sizeof()
    value for enum type.
    
    
    $cat test.C
    #include <stdio.h>
    enum foo { a = 0xffffffff, b = a | 0x01 };
    
    int main(void)
    {
        printf("sizeof(foo) == %d\na == %llx\nb == %x\n",
    sizeof(foo), a, b);
        return 0;
    }
    
    ACTUAL OUTPUT:
    
    $xlC test.C -o test && ./test
    sizeof(foo) == 8
    a == ffffffff
    b == ffffffff
    
    
    EXPECTED OUTPUT:
    
    $./test
    sizeof(foo) == 4
    a == ffffffff
    b == ffffffff
    

Local fix

  • Use unsigned cast:
    
    enum foo { a = 0xffffffff, b = unsigned(a | 0x01) };
    

Problem summary

  • PROBLEM DESCRIPTION: Enumerator type before the closing brace
    of the enumeration is not stored correctly. Enumerators will
    have incorrect integeral values when used in numeric context.
    
    USERS AFFECTED: programs with values greater than 0x7FFFFFFF
    used in the enumeration.
    

Problem conclusion

  • The enumerator types are now set correctly before the closing
    brace.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI76220

  • Reported component name

    XL C/C++ SLES10

  • Reported component ID

    5724U8300

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-06-10

  • Closed date

    2011-06-10

  • Last modified date

    2011-06-10

  • APAR is sysrouted FROM one or more of the following:

    IZ93324

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    XL C/C++ SLES10

  • Fixed component ID

    5724U8300

Applicable component levels



Document information

More support for: XL C/C++

Software version: A.1

Reference #: LI76220

Modified date: 10 June 2011