[Bug c/33933] "error: array type has incomplete element type" in system header

[joseph at codesourcery dot com]

------- Comment #2 from joseph at codesourcery dot com  2007-10-28 21:13 -------
Subject: Re:   New: "error: array type has incomplete element
 type" in system header

On Sun, 28 Oct 2007, danglin at gcc dot gnu dot org wrote:

> This was discussed in this thread:
> http://gcc.gnu.org/ml/gcc/2005-02/msg00054.html
> 
> In particular, the following DR was referenced as proof the above is
> "not valid C":
> http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_047.html
> 
> It says there regarding the submitted examples that "First of
> all, no constraints are violated. Therefore, no diagnostics are required."

A constraint was added in C99.

> So, I'm questioning why a -pedantic warning was changed to a hard error
> in gcc 4.0.0.  This seems to have been ignored in Joseph's response
> and the subsequent change.

I referenced bug 19333 in my message you reference above; it's an ICE 
showing the former undocumented extension did not work (the original bug 
summary was "Compilation SEGFAULTs with -O1 -finline-functions on the 
x86_64 architecture.").  That in turn links to gcc-patches discussions 
leading to it becoming a hard error.

The system header issue could be fixed by fixincludes.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33933