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我正在尝试使用 MemorySanitizer 工具构建 libc++，以便我可以使用 MemorySanitizer 构建自己的项目。我在 Ubuntu 16.04 上使用 Clang 8.01。

我按照此处给出的说明进行操作，但构建最初因链接器错误而失败。我通过使用 lld 而不是默认链接器更正了链接器错误。但是，由于 MemorySanitizer 警告，构建随后失败：

[  0%] Built target LLVMDemangle
[  4%] Built target LLVMSupport
[  4%] Built target LLVMTableGen
[  5%] Built target obj.llvm-tblgen
[  5%] Built target llvm-tblgen
[  5%] Building AttributesCompatFunc.inc...
==6384==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x51ee14 in _M_lower_bound /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_tree.h:1940:7
    #1 0x51ee14 in find /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_tree.h:2566
    #2 0x51ee14 in find /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_map.h:1194
    #3 0x51ee14 in llvm::RecordKeeper::getClass(llvm::StringRef) const /opt/llvm/llvm-801/include/llvm/TableGen/Record.h:1612
    #4 0xa2ff5c in llvm::TGParser::ParseClass() /opt/llvm/llvm-801/lib/TableGen/TGParser.cpp:2648:28
    #5 0xa2fceb in llvm::TGParser::ParseObject(llvm::MultiClass*) /opt/llvm/llvm-801/lib/TableGen/TGParser.cpp:3010:12
    #6 0xa37c9a in ParseObjectList /opt/llvm/llvm-801/lib/TableGen/TGParser.cpp:3022:9
    #7 0xa37c9a in llvm::TGParser::ParseFile() /opt/llvm/llvm-801/lib/TableGen/TGParser.cpp:3030
    #8 0x99fa00 in llvm::TableGenMain(char*, bool (*)(llvm::raw_ostream&, llvm::RecordKeeper&)) /opt/llvm/llvm-801/lib/TableGen/Main.cpp:100:14
    #9 0x8aa738 in main /opt/llvm/llvm-801/utils/TableGen/TableGen.cpp:253:10
    #10 0x7f11477df82f in __libc_start_main /build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
    #11 0x297028 in _start (/opt/llvm/llvm-801-msan/bin/llvm-tblgen+0x297028)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_tree.h:1940:7 in _M_lower_bound
Exiting
lib/IR/CMakeFiles/AttributeCompatFuncTableGen.dir/build.make:93: recipe for target 'lib/IR/AttributesCompatFunc.inc' failed
make[2]: *** [lib/IR/AttributesCompatFunc.inc] Error 77
CMakeFiles/Makefile2:1628: recipe for target 'lib/IR/CMakeFiles/AttributeCompatFuncTableGen.dir/all' failed
make[1]: *** [lib/IR/CMakeFiles/AttributeCompatFuncTableGen.dir/all] Error 2
Makefile:151: recipe for target 'all' failed
make: *** [all] Error 2

由于说明建议构建主干，我尝试构建最新版本标签（8.01），但这会产生完全相同的警告。问题似乎出在 GCC 的头文件中，所以也许我需要针对不同的标准库头文件进行编译？

我也尝试过这里的基本步骤，但发生了同样的错误。

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