It seems a lot of PRs fail in the same place.
```
test_tvm_bridge.test_tvm_bridge ... ERROR
======================================================================
ERROR: test_tvm_bridge.test_tvm_bridge
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/nose/case.py", line 197, in
runTest
self.test(*self.arg)
File "/work/mxnet/tests/python/gpu/test_tvm_bridge.py", line 61, in
test_tvm_bridge
check(tgt, dtype)
File "/work/mxnet/tests/python/gpu/test_tvm_bridge.py", line 46, in check
f = tvm.build(s, [x, y, zz, scale])
File
"/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/build_module.py",
line 501, in build
mhost = codegen.build_module(fhost, str(target_host))
File
"/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/codegen.py",
line 20, in build_module
return _Build(lowered_func, target)
File
"/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/_ffi/_ctypes/function.py",
line 185, in __call__
ctypes.byref(ret_val), ctypes.byref(ret_tcode)))
File
"/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/_ffi/base.py",
line 66, in check_call
raise TVMError(py_str(_LIB.TVMGetLastError()))
TVMError: [17:52:36] /tmp/tvm/src/codegen/codegen.cc:27: Check failed: bf !=
nullptr Target llvm is not enabled
Stack trace returned 10 entries:
[bt] (0)
/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/libtvm.so(dmlc::StackTrace[abi:cxx11]()+0x5a)
[0x7f16c88bd3aa]
[bt] (1)
/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/libtvm.so(tvm::codegen::Build(tvm::Array<tvm::LoweredFunc,
void> const&, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&)+0xdc4) [0x7f16c896bef4]
[bt] (2)
/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/libtvm.so(+0x1d025d)
[0x7f16c88bc25d]
[bt] (3)
/usr/local/lib/python2.7/dist-packages/tvm-0.5.dev0-py2.7-linux-x86_64.egg/tvm/libtvm.so(TVMFuncCall+0x5e)
[0x7f16c8cb273e]
[bt] (4) /usr/lib/x86_64-linux-gnu/libffi.so.6(ffi_call_unix64+0x4c)
[0x7f18c3167e40]
[bt] (5) /usr/lib/x86_64-linux-gnu/libffi.so.6(ffi_call+0x2eb) [0x7f18c31678ab]
[bt] (6)
/usr/lib/python2.7/lib-dynload/_ctypes.x86_64-linux-gnu.so(_ctypes_callproc+0x48f)
[0x7f18c33773df]
[bt] (7) /usr/lib/python2.7/lib-dynload/_ctypes.x86_64-linux-gnu.so(+0x11d82)
[0x7f18c337bd82]
[bt] (8) /usr/bin/python2(PyEval_EvalFrameEx+0x578f) [0x4c15bf]
[bt] (9) /usr/bin/python2(PyEval_EvalCodeEx+0x306) [0x4b9ab6]
```
[ Full content available at:
https://github.com/apache/incubator-mxnet/issues/12473 ]
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