https://bugs.llvm.org/show_bug.cgi?id=46618
Bug ID: 46618
Summary: libcxx compile failed occasionally
Product: libc++
Version: 10.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: changqing...@windriver.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Created attachment 23695
--> https://bugs.llvm.org/attachment.cgi?id=23695&action=edit
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.
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