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Strange error in C compiler

2007-12-25 7:53:00

        The results of the discussion can be summarized as follows:

        1) There is the only (almost?) portable way to test the

        value of address constants - to use additional variable:

        extern _DYNAMIC[];

        /* global - to avoid optimizations, though gcc I use doesn't

         * optimize "if" when pDYNAMIC is local

         */

        int * pDYNAMIC = _DYNAMIC;

        ...

        {

                if (pDYNAMIC) ....

                else ....

        }

        I must note the error in some answers. Their authors

        propose to test *_DYNAMIC. Obviously, this may cause NULL

        pointer access and therefore coredump.

        2) The source of strange behavior of the C compiler is

        its origin. GCC tries to optimize the "if" always,

        MS-DOS' Microsoft and Borland C don't make any presumptions about

        the value of address constants, and only PCC-derived

        compilers (3 of them have been tested, including SunOS')

        behave strangely.

        Thanks,


--
Leonid A. Broukhis

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