[Llvm-bgq-discuss] Does bgclang++11 implement thread_local

[Hal Finkel]

Hi Patrick,

Thanks for the report. I suspect this is another case where bgclang++11 needs to supplement the base system libraries; I'll need to see whether that is possible. thread_local should work on plain data types; I suspect this problem is tied to the need to call a destructor on this variable when the thread terminates.

 -Hal

----- Original Message -----
> From: "Patrick E Gartung" <gartung at fnal.gov>
> To: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Tuesday, July 12, 2016 11:25:54 PM
> Subject: [Llvm-bgq-discuss] Does bgclang++11 implement thread_local
> 
> Hi
> 
> I am trying to link code that uses thread_local and I get this error:
> 
> /soft/compilers/bgclang/nightly/wbin/bgclang++11   -g -fPIC
> -fno-vectorize -fno-slp-vectorize -std=c++11 -std=c++14  -dynamic
> -lsupc++ CMakeFiles/TBBDemo.dir/main.cpp.o  -o
> ../BuildProducts/bin/TBBDemo -rdynamic
> ../BuildProducts/lib64/libTBBFrameworkCore.a
> ../BuildProducts/lib64/libTBBTestModules.so
> ../BuildProducts/lib64/libTBBFrameworkCore.a
> /home/gartung/tbb44_20160526oss/build/linux_bg_clang_cc4.4.7_libc2.12_kernel2.6.32_release/libtbbmalloc.a
> /home/gartung/tbb44_20160526oss/build/linux_bg_clang_cc4.4.7_libc2.12_kernel2.6.32_release/libtbb.a
> -Wl,-rpath,/home/gartung/build/BuildProducts/lib64:
> ../BuildProducts/lib64/libTBBFrameworkCore.a(ModuleThreadStack.cpp.o):
> In function `demo::ModuleThreadStack::privateStack()':
> /home/gartung/toy-mt-framework/TBBProcessingDemo/TBBFrameworkCore/ModuleThreadStack.cpp:21:
> undefined reference to `__cxa_thread_atexit’
> 
> This is line 21 of ModuleThreadStack.cpp
> 
>     thread_local std::vector<TransitionModuleID> s_stack;
> 
> Does bgclang++11 implement thread_local?
> 
> Patrick Gartung
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> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory