Extraneous warning w/ -ansi -pedantic

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1 total messages Started by Jim Russell Wed, 12 Aug 1992 04:31

#929

Author: Jim Russell
Date: Wed, 12 Aug 1992 04:31

25 lines
1075 bytes

The following program:
    struct goo {
      int i;
    } a, b;

    main()
    {
      int x, y;

      y = ( x ? a : b ).i;
    }

when compiled with "gcc -ansi -pedantic" gets the following warning:
    goo.c: In function `main':
    goo.c:9: warning: ANSI C forbids use of conditional expressions as lvalues

However, ANSI does not requre that the first operand of the . operator be
an lvalue.  In fact, they even give an example (sec 3.3.2.3, pg 43 line 14)
where the first operand is not an lvalue (it's a function return in their
example).

We got this warning with gcc version 2.2 on the RS/6000, and gcc version
2.2.2 on the Sparc.

- Jim

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