Use of undeclared 'operator[]'

[llvmbot]

Bugzilla Link	9157
Resolution	INVALID
Resolved on	Feb 07, 2011 12:17
Version	trunk
OS	MacOS X
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor

Extended Description

I have a file with this line of code:
operator[j] = right[ i][ j];

llvm-g++ and g++ both compile it fine. clang++ gives the error in the summary.

Apple clang version 2.0 (tags/Apple/clang-134) (based on LLVM 2.9svn)

[DougGregor]

Without any context, there's no way we can determine whether your code is wrong or whether Clang has a bug. I strongly suspect that your code is wrong, and that you're hitting either

http://clang.llvm.org/compatibility.html#dep_lookup

or

http://clang.llvm.org/compatibility.html#dep_lookup_bases

both of which are common migration problems where g++/llvm-g++ accept code that is actually incorrect.

If you believe that Clang is wrong, please provide a small, self-contained example that demonstrates the problem you are seeing. The example should compile with g++/llvm-g++ but not with Clang.

[llvmbot]

This did compile with the 1.6 version of the tool chain put out by Apple. Do you know if this would have changed in llvm recently ? It could very wee be the code, not llvm.

The full C++ file is:
http://bazaar.launchpad.net/~stellarium/stellarium/trunk/view/head:/plugins/Satellites/src/gsatellite/gMatrixTempl.hpp

[DougGregor]

This did compile with the 1.6 version of the tool chain put out by Apple. Do
you know if this would have changed in llvm recently ? It could very wee be
the code, not llvm.

The full C++ file is:
http://bazaar.launchpad.net/~stellarium/stellarium/trunk/view/head:/plugins/Satellites/src/gsatellite/gMatrixTempl.hpp

Apple Clang 1.6 used llvm-g++ when compiling C++. That C++ file isn't standalone, since I'd need the entire project to build it. In any case, from looking at the source, I'm quite certain that it's the two-phase name lookup problem described here:

http://clang.llvm.org/compatibility.html#dep_lookup_bases

where Clang is correct to reject the program.

[llvmbot]

Thanks for the info.