On Aug 4, 2014, at 9:55 AM, Laszlo Ersek <ler...@redhat.com> wrote:
> On 08/04/14 17:02, Kinney, Michael D wrote:
>
>> The incomplete types between lib class .h and lib instance is not
>> something we done anywhere else. I prefer the lib class .h file to
>> be able to stand on its own.
>
> It is able.
>
>> Meaning it can be included by a module, but if not lib instance is
>> linked to the module, the module should still be able to compile.
>
> It is able.
>
> The term "incomplete type" is a term from the C standard. Incomplete
> types are the standard way to introduce the name of a type, but not its
> contents.
>
> 6.2.5 Types
>
> 1 The meaning of a value stored in an object or returned by a
> function is determined by the /type/ of the expression used to
> access it. (An identifier declared to be an object is the
> simplest such expression; the type is specified in the declaration
> of the identifier.) Types are partitioned into /object types/
> (types that fully describe objects), /function types/ (types
> that describe functions), and /incomplete types/ (types that
> describe objects but lack information needed to determine their
> sizes).
>
> Please compile and run the following C program:
>
> ----*----
> #include <stdio.h>
>
> typedef struct HELLO_WORLD HELLO_WORLD;
>
> int
> main(void)
> {
> HELLO_WORLD *pointer;
>
> pointer = NULL;
> fprintf(stdout, "hello world\n");
> return pointer == NULL ? 0 : 1;
> }
> ----*----
>
> $ gcc -ansi -pedantic -Wall -Wextra -Werror -o hello hello.c
> $ ./hello
> hello world
> $ echo $?
> 0
>
FYI, clang works the same way for -pedantic -Wall -Wextra -Werror
Thanks,
Andrew Fish
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