[Bug c/33076] Warning when passing a pointer to a const array to a function that expects a pointer to a non-cast one

[joseph at codesourcery dot com]

------- Comment #9 from joseph at codesourcery dot com  2007-09-26 12:42 -------
Subject: Re:  Warning when passing a pointer to a const array
 to a function that expects a pointer to a non-cast one

On Wed, 26 Sep 2007, jozef dot behran at krs dot sk wrote:

> And another point: Whether C/C++ have or don't have qualified array types,
> still the difference between the "const caca *" and "caca *" types is a "const"
> qualifier being applied to some part of the "caca *" base type. Therefore the
> types must be compatible when the automatic type conversion involved only adds
> "const" qualifiers to the type. Therefore the warnings are not legitimate.

Read the C FAQ.  You can't pass a "char **" where a "const char **" is 
expected either in C.  That's how the language works.

http://c-faq.com/ansi/constmismatch.html

C++ allows certain cases C doesn't that can be shown to be safe, as noted 
in that FAQ.  A proposal to make C use the C++ rules was rejected in the 
course of C99 development.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33076