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"David Crayford" <> writes:

> I ported some code which compiles ok on my PC using GCC but fails using the
> mainframe OS/390
> and z/OS compilers.
>
> static void exchange(void *a, void *b, size_t size) {
>
> <snip>
>
> *(((int *)a)++) = *((int *)b);
>
> produces the following compiler error
>
> Operand must be a modifiable lvalue
>
> The cast should take care of that, shouldn't it?

If you compile using GCC with the -pedantic flag, you'll at least get
the required diagnostic (warning) before GCC continues on to finish
compiling.

To get a (mostlhy) conformant C implementation from GCC, you need to
at least compile with the -ansi and -pedantic flags. Many here would
recommend using:

gcc -O2 -W -Wall -ansi -pedantic

HTH,
Micah

Micah Cowan wrote:
>
.... snip ...
>
> To get a (mostlhy) conformant C implementation from GCC, you
> need to at least compile with the -ansi and -pedantic flags.
> Many here would recommend using:
>
> gcc -O2 -W -Wall -ansi -pedantic

I have recently taken to adding -wwrite-strings.

--
Chuck F () ()
Available for consulting/temporary embedded and systems.
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