https://llvm.org/bugs/show_bug.cgi?id=26622
Bug ID: 26622
Summary: libcxx cannot find libatomic and cstddef
Product: Build scripts
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: cmake
Assignee: unassignedb...@nondot.org
Reporter: gonzalob...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
I am trying to install libcxx on a macosx 10.11.2 without installing libcxxabi
as explained in the libcxx website but cmake cannot find libatomic.
I am using a recently compiled and installed clang from source.
The command I am using is:
# Build libcxx without libcxxabi
cd ${LIBCXX_BUILD}
cmake ${LIBCXX_SRC} -DCMAKE_BUILD_TYPE=Release -DLIBCXX_ENABLE_ASSERTIONS=Off
-DLIT_EXECUTABLE=${LLVM_LIT} \
-DCMAKE_INSTALL_PREFIX=${PREFIX} -DLLVM_CONFIG=${PREFIX}/bin/llvm-config
make -j $POOL_JOBS
make install
The error I get is:
-- Configuring for standalone build.
-- Found LLVM_CONFIG as /Users/name/pool/bin/llvm-config
-- Found PythonInterp: /usr/local/bin/python (found version "2.7.11")
-- Sphinx disabled.
-- The CXX compiler identification is Clang 3.9.0
-- The C compiler identification is Clang 3.9.0
-- Check for working CXX compiler: /Users/name/pool/bin/clang++
-- Check for working CXX compiler: /Users/name/pool/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working C compiler: /Users/name/pool/bin/clang
-- Check for working C compiler: /Users/name/pool/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Performing Test LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB
-- Performing Test LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB - Failed
-- Looking for __atomic_fetch_add_8 in atomic
-- Looking for __atomic_fetch_add_8 in atomic - not found
CMake Error at cmake/Modules/CheckLibcxxAtomic.cmake:39 (message):
Host compiler appears to require libatomic, but cannot find it.
Call Stack (most recent call first):
cmake/config-ix.cmake:3 (include)
CMakeLists.txt:240 (include)
-- Configuring incomplete, errors occurred!
See also "/Users/name/pool/build/libcxx/CMakeFiles/CMakeOutput.log".
See also "/Users/name/pool/build/libcxx/CMakeFiles/CMakeError.log".
Basically from CMakeError.log I found that the problem was that #include
<cstddef> could not be found. That is why the atomic tests failed to compile,
but this is werid since cstddef is provided by libc++ itself.
I "fixed" this by just adding a path to libc++'s include directory to my
install command:
# Build libcxx without libcxxabi
cd ${LIBCXX_BUILD}
cmake ${LIBCXX_SRC} -DCMAKE_BUILD_TYPE=Release -DLIBCXX_ENABLE_ASSERTIONS=Off
-DLIT_EXECUTABLE=${LLVM_LIT} \
-DCMAKE_INSTALL_PREFIX=${PREFIX} -DLLVM_CONFIG=${PREFIX}/bin/llvm-config
-DCMAKE_CXX_FLAGS="-I${LIBCXX_SRC}/include"
make -j $POOL_JOBS
make install
Still it looks that I am missing something, why should this be necessary?
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