libstdc++ ensures that cin/cout/cerr are constructed before they are used, but
the scheme fails when using constructor priorities. Constructors with a
priority are run before constructors without a priority, which is the
appropriate behaviour. However, this means that this program:
#include <iostream>
void f1() __attribute__ ((constructor (101)));
void f1() { std::cout << "f1" << std::endl; }
int main() { }
will crash at runtime. f1 will be run at a user level priority, but it will
run before std::cout is initialized.
I suggest that on systems which support constructor priorities, that we arrange
to run ios_base::Init::Init() at a high priority. The destructor should also
be run at a high priority, of course.
--
Summary: cin/cout/cerr constructors should run at high priority
when possible
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ian at airs dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39796
