On Dec 14, 2007 9:31 AM, brian m. carlson
<[EMAIL PROTECTED]> wrote:
> >> backward/auto_ptr.h:177: warning:
> >> 'hash.std::auto_ptr<Botan::HashFunction>::_M_ptr' is used
> >> uninitialized in this function
> >> botan/dsa_gen.cpp:57: note:
> >> 'hash.std::auto_ptr<Botan::HashFunction>::_M_ptr' was declared here
> >>
> >> Looks spurious; the variable in question is declared with a
> >> constructor expression. (I am ignorant of what is going on inside
> >> auto_ptr though.)
>
> Assuming it is actually initialized using a constructor, then yes, this
> appears to be spurious. I haven't actually looked at the botan code,
> though.
It's definitely spurious. This is a minimal test case:
#include <string>
#include <memory>
class HashFunction {};
HashFunction *get_hash (std::string const &);
void generate_dsa_primes (void)
{ std::auto_ptr <HashFunction> hash(get_hash("SHA-160")); }
(If you change get_hash's argument to const char *, the diagnostic
goes away. Bizarre.)
Is now GCC bug #34470.
zw
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