[cfe-commits] [Patch] Tweak warning text for returning incomplete type from extern "C" functions

[Hans Wennborg]

Hi all,

The attached patch tweaks the warning text for returning incomplete
type from extern "C" functions.

A warning was added in r150128 for returning non-C compatible
user-defined types from functions with C linkage.

This makes the text more clear for the case when the type isn't
decidedly non-C compatible, but incomplete.

Please take a look.

Thanks,
Hans
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