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): 4.1.2-33 Additional info: 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 workaround.
Created attachment 272181 [details] Test case
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