Link error

[stefanhusmann]

Under Arch Linux I get a link error

../../lib/libLLVMSupport.a(Allocator.cpp.o): In function llvm::BumpPtrAllocator::Allocate(unsigned long, unsigned long)': /home/haawda/paketierung/maintained_by_me/emscripten-git/src/emscripten-fastcomp/lib/Support/Allocator.cpp:(.text+0x286): undefined reference to__msan_allocated_memory'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
utils/TableGen/CMakeFiles/llvm-tblgen.dir/build.make:887: recipe for target 'bin/llvm-tblgen' failed

Unrelated to this error, I think there is a typo in emscripten-fastcomp/lib/Bitcode/NaCl/Writer/CMakeLists.txt

sed -i 's+intinsics_gen+intrinsics_gen+'
$srcdir/emscripten-fastcomp/lib/Bitcode/NaCl/Writer/CMakeLists.txt

[kripken]

Can you build llvm and clang (non-emscripten) on that machine? I don't think emscripten modifies anything related to that error, nor that possible typo.

[stefanhusmann]

It was a little difficult, but yes, LLVM and Clang were buildable. Also were former versions of emscripten, e.g. 1.22.1.330.g1c49a75.

[kripken]

Since a previous version built ok, bisection would be useful here, to see which changeset made it stop building for your system.

[stefanhusmann]

I should have mentioned, that I used clang for building. If I explitely set cc to gcc, emscripten builds fine.

[adembo]

I don't know anything about emscripten, but I ran into this same issue while working on a different project. The problem was that I was building LLVM 3.4 sources with clang 3.5. This doesn't work.

Why? Because llvm/include/Support/Compiler.h will include msan_interface.h unconditionally, and msan_interface.h from clang 3.5 (on my local machine) also defines its symbols unconditionally (without a __has_feature(memory_sanitizer) check that would ensure that -fsanitize=memory is set on the link line). The net result is that references to msan leak into the build even though -fsanitize=memory was never set, and those references are not satisfied by clang during linking.

[CoolOppo]

I have the same issue when building with Clang version 3.5.1-1~exp1~gd~u on Ubuntu 14.10. I will have to try using GCC I guess, although it would be nice to be able to build this without it.

[stale]

This issue has been automatically marked as stale because there has been no activity in the past 2 years. It will be closed automatically if no further activity occurs in the next 7 days. Feel free to re-open at any time if this issue is still relevant.