[LLVMbugs] [Bug 22623] New: Possible regression in clang regarding discarded section at link time

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22623

            Bug ID: 22623
           Summary: Possible regression in clang regarding discarded
                    section at link time
           Product: clang
           Version: 3.6
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: benpope81 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Whilst compiling RxCpp with clang 3.6.0 (branches/release_36 229488) I get this
error (and lots more very similar):
`.text.startup' referenced in section `.text.startup' of
CMakeFiles/rxcppv2_test.dir/home/ben/development/test/rxcpp/RxCpp/Rx/v2/test/subscriptions/subscription.cpp.o:
defined in discarded section
`.text.startup[_ZN5rxcpp22composite_subscription12shared_emptyE]' of
CMakeFiles/rxcppv2_test.dir/home/ben/development/test/rxcpp/RxCpp/Rx/v2/test/subscriptions/subscription.cpp.o

shared_empty is declared like this, in a header file:
__attribute__((weak)) composite_subscription
composite_subscription::shared_empty =
composite_subscription(detail::tag_composite_subscription_empty());

Instructions to compile RxCpp:
mkdir rxcpp_clang
cd rxcpp_clang/
git clone --recursive https://github.com/BenPope/RxCpp.git
mkdir build
cd build
cmake -GNinja -DCMAKE_C_COMPILER=clang-3.6 -DCMAKE_CXX_COMPILER=clang++-3.6
-DCMAKE_CXX_FLAGS="-std=c++14" ../projects/CMake
ninja rxcppv2_test

That should reproduce the errors.
It compiles and links fine with clang-3.5.1, gcc-4.6.3, gcc-4.8.4, gcc-4.9.2, 


I've made some changes to the branch that allow it to link, but I'm not sure if
they are equivalent:
cd ../RxCpp
git checkout tweak-static-symbols
cd ../build/
ninja

Should compile and link.

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