[llvm-bugs] [Bug 26785] New: is_equal failure with GCC shared libraries

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26785

            Bug ID: 26785
           Summary: is_equal failure with GCC shared libraries
           Product: libc++abi
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: rianquinn at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

Libcxxabi does not appear to properly handle typeinfo when working across
multiple shared libraries compiled using GCC. The issue I am having is throwing
an exception in one shared library, and catching in another, but I also noticed
that dynamic_cast has the same issue (cast from a different shared library). In
both cases they fail.  

At the very top of private_typeinfo.cpp, there is the following function:

is_equal(const std::type_info* x, const std::type_info* y, bool use_strcmp)
{
#ifndef _WIN32
    if (!use_strcmp)
        return x == y;
    return strcmp(x->name(), y->name()) == 0;
#else
    return (x == y) || (strcmp(x->name(), y->name()) == 0);
#endif
}


If I modify this code such that, it thinks it's Windows the problem goes away
(i.e. it always performs the strcmp if needed). I am currently using the latest
GCC (5.3) and the latest libcxxabi (master - head).

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