On 28 Jan 2021, at 05:05, Tom Stellard via llvm-dev <llvm-...@lists.llvm.org> wrote: > > I've tagged the 12.0.0-rc1 release. Testers can begin testing and upload > binaries.
During 12.0.0-rc1 test builds on FreeBSD, I encountered this unittest failure,
which turned out to be caused by recent libc++ changes:
FAILED: tools/clang/bindings/python/tests/CMakeFiles/check-clang-python
cd /home/dim/llvm/12.0.0/llvm-project/clang/bindings/python &&
/usr/local/bin/cmake -E env
CLANG_LIBRARY_PATH=/home/dim/obj/llvmorg-12.0.0-rc1-2-gdf959fc2eb7e-1/lib
/usr/local/bin/python3.7 -m unittest discover
EEEEEEEE
The 'EEEEEEEE' signifies 8 errors, which become more clear if "unittest
discover" is run with the -f (fail immediately) and -v (verbose) options:
$ cd /home/dim/llvm/12.0.0/llvm-project/clang/bindings/python &&
/usr/local/bin/cmake -E env
CLANG_LIBRARY_PATH=/home/dim/obj/llvmorg-12.0.0-rc1-2-gdf959fc2eb7e-1/lib
/usr/local/bin/python3.7 -m unittest discover -f -v
test_access_specifiers
(tests.cindex.test_access_specifiers.TestAccessSpecifiers)
Ensure that C++ access specifiers are available on cursors ... ERROR
======================================================================
ERROR: test_access_specifiers
(tests.cindex.test_access_specifiers.TestAccessSpecifiers)
Ensure that C++ access specifiers are available on cursors
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/clang/cindex.py",
line 4173, in get_cindex_library
library = cdll.LoadLibrary(self.get_filename())
File "/usr/local/lib/python3.7/ctypes/__init__.py", line 442, in LoadLibrary
return self._dlltype(name)
File "/usr/local/lib/python3.7/ctypes/__init__.py", line 364, in __init__
self._handle = _dlopen(self._name, mode)
OSError:
/home/dim/obj/llvmorg-12.0.0-rc1-2-gdf959fc2eb7e-1/lib/../lib/libc++.so.1:
Undefined symbol "_ZnamSt11align_val_t"
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/tests/cindex/test_access_specifiers.py",
line 29, in test_access_specifiers
""", lang = 'cpp')
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/tests/cindex/util.py",
line 41, in get_tu
source)])
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/clang/cindex.py",
line 2812, in from_source
index = Index.create()
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/clang/cindex.py",
line 2699, in create
return Index(conf.lib.clang_createIndex(excludeDecls, 0))
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/clang/cindex.py",
line 212, in __get__
value = self.wrapped(instance)
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/clang/cindex.py",
line 4147, in lib
lib = self.get_cindex_library()
File
"/home/dim/llvm/12.0.0/llvm-project/clang/bindings/python/clang/cindex.py",
line 4178, in get_cindex_library
raise LibclangError(msg)
clang.cindex.LibclangError:
/home/dim/obj/llvmorg-12.0.0-rc1-2-gdf959fc2eb7e-1/lib/../lib/libc++.so.1:
Undefined symbol "_ZnamSt11align_val_t". To provide a path to libclang use
Config.set_library_path() or Config.set_library_file().
----------------------------------------------------------------------
Ran 1 test in 0.027s
FAILED (errors=1)
It turns out that libc++.so.1 now depends on the symbol '_ZnamSt11align_val_t',
which is 'operator new [](unsigned long, std::align_val_t)'. Embarassingly,
libc++.so.1 has always depended on this C++17 specific variant of operator new.
But FreeBSD's C++ ABI library, libcxxrt, has never supported this variant!
Previously, this never was a problem, because libc++ provided its own weak
definitions of these operators. But recently the define
_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS was toggled to on by default, which
disables those definitions. This happened in
9b40ee8eb0c194f4b2787801ac6f9ef8fc1b8f46 ("[libc++] Define new/delete in
libc++abi only by default") by Louis Dionne.
While this is reasonable for the libc++abi situation, where it might lead to
circular dependencies, I would like to turn the definitions on again in case
libcxxrt is used for the C++ ABI, such as on FreeBSD.
If you think this is a reasonable approach, I will create a review for it.
Otherwise, I will have to patch the test-release.sh script to pass
-DLIBCXX_ENABLE_NEW_DELETE_DEFINITIONS=ON to the CMake command line on FreeBSD.
-Dimitry
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