[LLVMbugs] [Bug 21573] libxcb-1.11 miscompiles with Clang -O2 on x86_32/linux

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21573

Reid Kleckner <rnk at google.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
           Assignee|unassignedbugs at nondot.org   |rnk at google.com

--- Comment #8 from Reid Kleckner <rnk at google.com> ---
I went and looked at sys/socket.h, and it uses transparent unions. After
reading the gcc docs
(https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#index-g_t_0040code_007btransparent_005funion_007d-attribute-3157),
we decided this was a bug in clang. transparent union changes how the value is
passed.

Turns out, we had a test case with a FIXME already documenting the problem. I
fixed it in r222074.

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