http://llvm.org/bugs/show_bug.cgi?id=12835
Bug #: 12835
Summary: regression(r156821): chromium components build broken
due to changes in visibility handling
Product: clang
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 8568
--> http://llvm.org/bugs/attachment.cgi?id=8568
repro
Compile the attachment with
clang++ -c repro.ii -fvisibility=hidden
then run `nm -m repro.o`.
gcc4.2 and clang prior to r156821 resulted in:
0000000000000000 (__DATA,__data) external
__ZN18DeviceDataProviderI9RadioDataE17factory_function_E
(undefined) external
__ZN18DeviceDataProviderI9RadioDataE22DefaultFactoryFunctionEv
clang with r156821 results in:
0000000000000000 (__DATA,__data) private external
__ZN18DeviceDataProviderI9RadioDataE17factory_function_E
(undefined) external
__ZN18DeviceDataProviderI9RadioDataE22DefaultFactoryFunctionEv
This breaks the chromium component build, target 'content_unittest' no longer
links.
$ cat repro.ii
struct __attribute__((visibility("default"))) RadioData {};
class __attribute__((visibility("default"))) DeviceDataProviderImplBaseHack {};
template<typename DataType>
class DeviceDataProviderImplBase : public DeviceDataProviderImplBaseHack {};
template<typename DataType>
class DeviceDataProvider {
typedef DeviceDataProviderImplBase<DataType>* (*ImplFactoryFunction)(void);
__attribute__((visibility("default"))) static
DeviceDataProviderImplBase<DataType>* DefaultFactoryFunction();
__attribute__((visibility("default"))) static ImplFactoryFunction
factory_function_;
};
template<>
DeviceDataProvider<RadioData>::ImplFactoryFunction
DeviceDataProvider<RadioData>::factory_function_ = DefaultFactoryFunction;
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