[lldb-dev] help, how to get a debug build on windows (python37_d.lib)
Pavel Labath via lldb-dev
lldb-dev at lists.llvm.org
Mon Sep 23 04:55:34 PDT 2019
On 22/09/2019 20:20, Larry D'Anna via lldb-dev wrote:
> Hi lldb-dev.
> I can’t seem to figure out how to build a debug lldb on windows. It
> wants to link against a debug version of Python, which isn’t there.
> My cmake line looks like this:
> cmake -G Ninja `
> "-DPYTHON_HOME=C:\Program Files (x86)\Microsoft Visual
> Studio\Shared\Python37_64" `
> "-DLLVM_ENABLE_PROJECTS=clang;lldb;libcxx;libcxxabi;lld" `
> "-DSWIG_EXECUTABLE=C:\ProgramData\chocolatey\bin\swig.exe" `
> I also made this change, to tell it to link against the release python.
> --- a/lldb/cmake/modules/LLDBConfig.cmake
> +++ b/lldb/cmake/modules/LLDBConfig.cmake
> @@ -227,7 +227,7 @@ function(find_python_libs_windows)
> # Lookup for concrete python installation depending on build type
> if (CMAKE_BUILD_TYPE STREQUAL Debug)
> - set(LOOKUP_DEBUG_PYTHON TRUE)
> + set(LOOKUP_DEBUG_PYTHON FALSE)
> set(LOOKUP_DEBUG_PYTHON FALSE)
> But somehow at the very end, the link still fails because python37_d.lib
> isn’t there.
> Anybody know what I’m doing wrong? Thank you.
I don't know the full details, but it is my understanding that due to
how windows runtime libraries work (they have a separate debug and
release CRT), all libraries in a single application need be linked
against the same CRT flavour. IIRC, the default python installation does
not come with a debug python, but it should be possible to install it
somehow (possibly via checking some box in the installation dialog, but
I don't remember the details).
It should also be possible to create a "fake" debug build by setting the
CMAKE_BUILD_TYPE to Release, and enabling debug info (and disabling
optimizations) via CMAKE_CXX_FLAGS, but it's probably better to just get
the debug python installed.
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