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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - libcxx compile failed occasionally"
href="https://bugs.llvm.org/show_bug.cgi?id=46617">46617</a>
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<th>Summary</th>
<td>libcxx compile failed occasionally
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>changqing.li@windriver.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=23694" name="attach_23694" title="compile failed log">attachment 23694</a> <a href="attachment.cgi?id=23694&action=edit" title="compile failed log">[details]</a></span>
compile failed log
Hi,
With the same configure, it can always build successfully, only met one time
that libcxx compile failed. please see the log.
here is some configure option:
-DCMAKE_CROSSCOMPILING=ON
-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON
-DLIBUNWIND_ENABLE_SHARED=OFF
-DLIBUNWIND_ENABLE_THREADS=OFF
-DLIBUNWIND_WEAK_PTHREAD_LIB=ON
-DLIBUNWIND_ENABLE_CROSS_UNWINDING=ON
-DLIBCXXABI_INCLUDE_TESTS=OFF
-DLIBCXXABI_ENABLE_SHARED=ON
-DLIBCXXABI_USE_COMPILER_RT=ON
-DLIBCXXABI_LIBCXX_INCLUDES=${S}/libcxx/include
-DLIBCXX_CXX_ABI=libcxxabi
-DLIBCXX_USE_COMPILER_RT=ON
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${S}/libcxxabi/include
-DLIBCXX_CXX_ABI_LIBRARY_PATH=${B}/lib${LLVM_LIBDIR_SUFFIX}
-DCMAKE_AR=${STAGING_BINDIR_TOOLCHAIN}/${AR}
-DCMAKE_NM=${STAGING_BINDIR_TOOLCHAIN}/${NM}
-DCMAKE_RANLIB=${STAGING_BINDIR_TOOLCHAIN}/${RANLIB}
-DLLVM_ENABLE_PROJECTS='libcxx;libcxxabi;libunwind'
-DLLVM_LIBDIR_SUFFIX=${LLVM_LIBDIR_SUFFIX}
>From the log, build lib/libc++.so.1.0 failed when linking libc++abi.a,
According to the libcxx/src/CMakelist.txt,
LIBCXX_ENABLE_SHARED is ON,
LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY is OFF
so target_link_libraries(cxx_shared PUBLIC "${LIBCXX_CXX_SHARED_ABI_LIBRARY}")
LIBCXX_CXX_SHARED_ABI_LIBRARY is cxxabi
and both libcxxabi.so and libcxxabi.a will be generated under
LIBCXX_CXX_ABI_LIBRARY_PATH.
I guess the failure happened when libcxxabi.a is generated, and libcxxabi.so is
not generated. maybe we need add dependency to .so explicitly? I suspect that
target_link_libraries don't handle dependency well.</pre>
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