[llvm-bugs] [Bug 46618] New: libcxx compile failed occasionally

[via llvm-bugs]

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: unassignedclangbugs at nondot.org
          Reporter: changqing.li at windriver.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at 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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