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I am trying to build llvm from source following their instructions under the using visual studio section. When I run the command cmake -DLLVM_ENABLE_PROJECTS=clang -G "Visual Studio 17 2022" -A x64 -Thost=x64 ..\llvm, everything appears fine, until i see the following:

-- Could NOT find ZLIB (missing: ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
-- Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
-- Could NOT find Backtrace (missing: Backtrace_LIBRARY Backtrace_INCLUDE_DIR)
CMake Error at C:/Users/[REDACTED]/Desktop/llvm-project/build/CMakeFiles/CMakeTmp/CMakeLists.txt:23 (set):
  Syntax error in cmake code at

    C:/Users/[REDACTED]/Desktop/llvm-project/build/CMakeFiles/CMakeTmp/CMakeLists.txt:23

  when parsing string

    C:\Users\[REDACTED]\Desktop\llvm-project\build/CMakeFiles/CMakeTmp

  Invalid character escape '\U'.


CMake Error at cmake/modules/GetErrcMessages.cmake:32 (try_run):
  Failed to configure test project build system.
Call Stack (most recent call first):
  cmake/config-ix.cmake:477 (get_errc_messages)
  CMakeLists.txt:986 (include)


-- Configuring incomplete, errors occurred!

I think I can deal with the first three lines, but what do I do about the fact that it is improperly escaped?

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  • Use / for your path separator not \
    – drescherjm
    Commented Mar 21 at 23:06
  • @drescherjm It appears that you cannot change the path separator on windows, (answers.microsoft.com/en-us/windows/forum/all/…)
    – inyourface3445
    Commented Mar 21 at 23:41
  • My guess would be something in REDACTED is confusing cmake
    – Alan Birtles
    Commented Mar 22 at 1:29
  • 1
    The llvm build instructions admonish you "do not install into a path containing spaces (e.g. c:\Documents and Settings\...) as it will fail."
    – Botje
    Commented Mar 22 at 8:53
  • 1
    You might not be able to change the default directory separator, or the fact that "\" is the root directory name, but C:/Users is still a valid directory name, using a non-default separator.
    – BoP
    Commented Mar 22 at 11:17
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