[cfe-dev] Clang and C++Ox : what I'm doing wrong

[Argyrios Kyrtzidis]

On Oct 8, 2010, at 8:49 AM, John McCall wrote:

> 
> On Oct 8, 2010, at 8:47 AM, Argyrios Kyrtzidis wrote:
> 
>> On Oct 8, 2010, at 12:27 AM, Jaonary Rabarisoa wrote:
>> 
>>> Hi all,
>>> 
>>> I trying build the following simple code that use a static const variable inside a class but I got an undefinend reference error :
>>> 
>>> #include <iostream>
>>> 
>>> using namespace std;
>>> 
>>> class Test
>>> {
>>> public :
>>>   static const double value = 10.0;
>>> };
>>> 
>>> 
>>> int main()
>>> {
>>> cout << "hello "  << Test::value << endl;
>>> return 0;
>>> }
>>> 
>>> This code produce the following warning and error at link time :
>>> 
>>> clang: warning: argument unused during compilation: '-cc1'
>>> /home/jrabarisoa/Sandbox/test_clang/main.cpp:27:25: warning: in-class initializer for static data member of type 'const double' is a
>>>     C++0x extension [-Wc++0x-extensions]
>>>   static const double value = 10.0;
>>>                       ^       ~~~~
>>> 1 warning generated.
>>> Linking CXX executable test
>>> g++: unrecognized option '-cc1'
>>> CMakeFiles/test.dir/main.cpp.o: In function `main':
>>> /home/jrabarisoa/Sandbox/test_clang/main.cpp:(.text+0x7a): undefined reference to `Test::value'
>>> collect2: ld returned 1 exit status
>> 
>> Why are we requiring a definition for Test::value, isn't this supposed to be used as a constant ? John ?
> 
> Probably various places don't realize that they can emit that as a constant.

Jaonary, please file a bug report so we can keep track of this.

-Argiris

> 
> John.
> 
> 
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