------- Comment #4 from reddwarf at opensuse dot org 2010-08-15 20:21 ------- > Yes, POSIX adds additional requirements about pointer representation and > conversion, but AFAIK all targets GCC support and have POSIXish runtime > satisfy > that. The conversion between pointer types is not the problem in your code, > it > is aliasing violation, and there is nothing in POSIX that says your code is > valid.
Uhm. Sorry, indeed the example code in posix 2008 dlsym() documentation is wrong because of aliasing (where should this be reported? is also wrong in http://www.kernel.org/doc/man-pages/). I was confused because that code was wrong in posix 2004 but the fix from comment #1 was also wrong (not anymore in posix 2008). But using the fix from comment #1 gcc complains with "warning: ISO C forbids conversion of object pointer to function pointer type", at least when using -pedantic. The *message* in the warning is correct. But it is complaining about something that isn't a conversion from "object pointer to function pointer type" but a conversion from "void* pointer to function pointer type", that posix 2008 explicitly allows. -- reddwarf at opensuse dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |UNCONFIRMED Resolution|INVALID | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45289
