Question

我在这里遵循了指示：

https://github.com/google/sanitizers/wiki/MemorySanitizerLibcxxHowTo

但是由于llvm-tblgen中的未初始化值，构建失败：

[244/3059] Building Attributes.inc...
FAILED: include/llvm/IR/Attributes.inc
cd builds/msan-10.0.1 && builds/msan-10.0.1/bin/llvm-tblgen -gen-attrs -I llvm-project/llvm/include/llvm/IR -I llvm-project/llvm/include llvm-project/llvm/include/llvm/IR/Attributes.td --write-if-changed -o include/llvm/IR/Attributes.inc -d include/llvm/IR/Attributes.inc.d
...

SUMMARY: MemorySanitizer: use-of-uninitialized-value /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_tree.h:1348:4 in _M_lower_bound_tr<llvm::StringRef, void>
Exiting

类似的错误，甚至可以通过-DCMAKE_CXX_FLAGS="-stdlib=libc++"切换到libc ++

SUMMARY: MemorySanitizer: use-of-uninitialized-value llvm-project/llvm/lib/Support/StringRef.cpp:349:3 in llvm::StringRef::split(llvm::SmallVectorImpl<llvm::StringRef>&, char, int, bool) const

这里的问题是项目建立了很多不需要的辅助二进制文件，包括llvm-tblgen。我必须使用-DLLVM_TABLEGEN=/usr/bin/llvm-tblgen-10来消除此错误。

但是，现在构建需要30分钟。过去速度更快，而且可以在没有所有额外垃圾箱的情况下进行构建。我应该使用什么cmake参数来抑制它们？过去只有llvm-lit建立。

$ ls msan-10.0.1/bin
bugpoint          llvm-cvtres                   llvm-jitlink                    llvm-opt-fuzzer                llvm-strip
count             llvm-cxxdump                  llvm-lib                        llvm-opt-report                llvm-symbolizer
dsymutil          llvm-cxxfilt                  llvm-link                       llvm-pdbutil                   llvm-tblgen
FileCheck         llvm-cxxmap                   llvm-lipo                       llvm-PerfectShuffle            llvm-undname
llc               llvm-diff                     llvm-lit                        llvm-profdata                  llvm-xray
lli               llvm-dis                      llvm-locstats                   llvm-ranlib                    llvm-yaml-numeric-parser-fuzzer
lli-child-target  llvm-dlltool                  llvm-lto                        llvm-rc                        not
llvm-addr2line    llvm-dwarfdump                llvm-lto2                       llvm-readelf                   obj2yaml
llvm-ar           llvm-dwp                      llvm-mc                         llvm-readobj                   opt
llvm-as           llvm-elfabi                   llvm-mca                        llvm-reduce                    sancov
llvm-bcanalyzer   llvm-exegesis                 llvm-microsoft-demangle-fuzzer  llvm-rtdyld                    sanstats
llvm-cat          llvm-extract                  llvm-modextract                 llvm-size                      verify-uselistorder
llvm-cfi-verify   llvm-ifs                      llvm-mt                         llvm-special-case-list-fuzzer  yaml2obj
llvm-config       llvm-install-name-tool        llvm-nm                         llvm-split                     yaml-bench
llvm-cov          llvm-isel-fuzzer              llvm-objcopy                    llvm-stress
llvm-c-test       llvm-itanium-demangle-fuzzer  llvm-objdump                    llvm-strings

更新使用LLVM_BUILD_TOOLS会有所帮助：

-DLLVM_BUILD_TOOLS=off -DLLVM_TABLEGEN=$(which llvm-tblgen)

它仍然生成更少的二进制文件：

$ ls bin
count             llvm-go                       llvm-microsoft-demangle-fuzzer  llvm-readobj                     not
FileCheck         llvm-install-name-tool        llvm-objcopy                    llvm-special-case-list-fuzzer    yaml-bench
lli-child-target  llvm-isel-fuzzer              llvm-opt-fuzzer                 llvm-strip
llvm-addr2line    llvm-itanium-demangle-fuzzer  llvm-PerfectShuffle             llvm-symbolizer
llvm-ar           llvm-lib                      llvm-ranlib                     llvm-tblgen
llvm-dlltool      llvm-lit                      llvm-readelf                    llvm-yaml-numeric-parser-fuzzer

我实际上在PATH中具有所有二进制文件，因此从理论上讲，我不需要构建它们。因此，我尝试：-DLLVM_INCLUDE_TOOLS=off。但是随后cmake配置失败，出现许多cmake错误，如下所示：

CMake Error at cmake/modules/AddLLVM.cmake:1636 (add_dependencies):
  The dependency target "bugpoint" of target "check-llvm-tools-yaml2obj-coff"
  does not exist.
Call Stack (most recent call first):
  cmake/modules/AddLLVM.cmake:1688 (add_lit_target)
  test/CMakeLists.txt:181 (add_lit_testsuites)


CMake Error at cmake/modules/AddLLVM.cmake:1636 (add_dependencies):
  The dependency target "dsymutil" of target "check-llvm-tools-yaml2obj-coff"
  does not exist.
Call Stack (most recent call first):
  cmake/modules/AddLLVM.cmake:1688 (add_lit_target)
  test/CMakeLists.txt:181 (add_lit_testsuites)


CMake Error at cmake/modules/AddLLVM.cmake:1636 (add_dependencies):
  The dependency target "llc" of target "check-llvm-tools-yaml2obj-coff" does
  not exist.
Call Stack (most recent call first):
  cmake/modules/AddLLVM.cmake:1688 (add_lit_target)
  test/CMakeLists.txt:181 (add_lit_testsuites)

如何仅为llvm-10构建检测到的libcxx？

0 个答案: