Red Hat Bugzilla – Bug 403881
Noisy and unnecessary "lowering visibility" warnings
Last modified: 2009-01-09 00:22:23 EST
Description of problem:
Under certain circumstances, gcc emits some very noisy and--as far as I can
tell--unnecessary "lowering visibility" warnings.
Version-Release number of selected component (if applicable):
The attached example demonstrates the warning as it is encountered when using
boost::mpl::for_each. The warning is triggered when the types in the type vector
have default visibility and the function object has hidden visibility. Iterating
over public types while applying a function object that is part of the
implementation is a pretty normal use case.
The gcc main line does not issue a warning in this case. It appears that the
code that emits it has been replaced upstream, but lingers in Red Hat's gcc.
The only way I have found to suppress this warning is -Wno-attributes. That
nukes all attribute-related warnings, and as such is not really an acceptable
Created attachment 272181 [details]
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