------- Comment #6 from fp at mc dot com 2009-06-10 12:50 ------- Jonathan,
thank you for identifying the bug in my original code. According to my copy of ISO 14992:1998, std::iostream does not have a default constructor. However, my reading of the standard leads me to believe that it is valid to pass a null pointer. The description for basic_ios::init() (27.4.4.1) says that, as a postcondition, rdstate() is "goodbit if sb is not a null pointer, otherwise badbit". libstdc++ does provide a default constructor for std::iostream. However, either way, passing a null std::streambuf pointer to std::iostream (which I believe is valid), or calling the "gcc extension" default constructor, both still lead to a crash. I've looked at the source code for std::iostream and its base classes and it does not appear to dereference sb, it merely assigns the pointer to a meber variable and tests it for non-null. I am updating the test case. Can someone please do me a favor and test this with a more current version of gcc? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40391
