[lldb-dev] LLDB_PYTHON_HOME

[Jonas Devlieghere via lldb-dev]

Hey Adrian,

Config.h gets generated by expanding the corresponding CMake variables. If
you look at LLDBConfig.cmake, you can see that LLDB_PYTHON_HOME is computed
from PYTHON_EXECUTABLE. The problem appears that somehow CMake ignored your
specified PYTHON_HOME and decided to pick a different Python. I'm not sure
why though, because I use a similar CMake invocation on Windows.

> cmake ..\llvm-project\llvm -G Ninja -DCMAKE_BUILD_TYPE=RelWithDebInfo
-DLLVM_ENABLE_PROJECTS="llvm;clang;lldb;lld" -DLLVM_ENABLE_ASSERTIONS=OFF
-DLLVM_ENABLE_ZLIB=FALSE -DLLDB_ENABLE_PYTHON=TRUE
-DPYTHON_HOME="C:/Program Files/Python36/"

According to FindPython3 (
https://cmake.org/cmake/help/v3.12/module/FindPython3.html), you can set
Python3_ROOT_DIR as a hint. Can you give that a try? If that works we
should populate that variable from PYTHON_HOME in
FindPythonInterpAndLibs.cmake.

Cheers,
Jonas

On Thu, Feb 27, 2020 at 10:10 AM Adrian McCarthy via lldb-dev <
lldb-dev at lists.llvm.org> wrote:

> Is there documentation on how lldb\include\lldb\host\config.h is
> generated?  I'm again having the problem of the config trying to point to
> the wrong Python installation.
>
> When I run cmake, I explicitly point PYTHON_HOME to C:\Python36 like this:
>
> cmake -GNinja -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON
> -DCMAKE_BUILD_TYPE=Debug -DLLDB_TEST_DEBUG_TEST_CRASHES=1
> -DPYTHON_HOME=C:\Python36
> -DLLDB_TEST_COMPILER=D:\src\llvm\build\ninja\bin\clang.exe
> ..\..\llvm-project\llvm -DLLVM_ENABLE_ZLIB=OFF
> -DLLVM_ENABLE_PROJECTS="clang;lld;lldb"
>
> But the generated Config.h contains:
>
> #define LLDB_PYTHON_HOME "C:/Program Files (x86)/Microsoft Visual
> Studio/Shared/Python37_64"
>
>
> And the mismatch causes my build to fail because it goes looking for
> python37_d.dll, which is apparently not part of the Microsoft distribution.
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