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Scriptstdstring add-on under clang/LLVM 4.0 with libc++ and C++11

Started by Ricky C. Jul 29, 2012 at 10:51 PM 2 replies 2.5k views

Original Post

Jul 29, 2012 at 10:51 PM

I (finally) got our entire engine to compile - see more about the epic saga in my blog post Adventures in compiling for Mac OSX. However to do so, I had to patch one add-on. Turns out that under clang/LLVM, when using the libc++ standard library, the operator+= and empty() methods of std::basic_string are inlined. This causes the linker to be unable to find the declarations the add-on is attempting to register - they don't exist.

After digging around, I was able to create the attached patch. This has allowed for compilation on my systems: OSX 10.7 and 10.8 using XCode 4.3 and 4.4 respectively. I have not yet tested execution, as there's still many yards of code for me to write to get there.

WitchLord

Jul 30, 2012 at 1:17 AM

That's odd. It should be allowed to take the address of an inlined function. It will just force the compiler to provide a non-inlined version alongside the inlined one.

Anyway, I'll apply the patch as soon as possible.

Thanks,
Andreas

Ricky C.

Jul 30, 2012 at 4:09 AM

I'm not 100% about the underlying cause. I did note that the std::basic_string::empty() method was marked for inlining, and I hypothesized off that. Beyond there.... All I'm 100% certain of is that providing wrapper functions cleared out the error. Someone with a far more extensive knowledge of the subject could dig deeper.

WitchLord

Jul 30, 2012 at 11:24 PM

Patch applied in revision 1378.

Thanks,
Andreas

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