https://bugs.llvm.org/show_bug.cgi?id=34614
Bug ID: 34614
Summary: clang silently ignores visibility attributes after
implicit instantiation
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: smee...@fb.com
CC: compn...@compnerd.org, dgre...@apple.com,
e...@efcs.ca, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
% cat repro.cc
template <class> class c { void f() {} };
template <> void c<int>::f() {}
template class __attribute__((__visibility__("default"))) c<int>;
% clang++ -std=c++11 -fvisibility=hidden -fvisibility-inlines-hidden \
-Wall -S -emit-llvm -o - | grep _ZN1cIiE1fEv
define hidden void @_ZN1cIiE1fEv(%class.c* %this) #0 align 2 {
The specialization on line 2 causes an implicit instantiation, which causes the
attributes on the explicit instantiation to be ignored. Ignoring the attributes
is a perfectly sane thing to do, but we should at least warn when we're doing
this, similar to gcc:
% g++ -std=c++11 -fsyntax-only repro.cc
repro.cc:3:59: warning: type attributes ignored after type is already defined
[-Wattributes]
template class __attribute__((__visibility__("default"))) c<int>;
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