Is it possible to switch the runtime library on Windows to MTd?

[tastewar]

When I build llfio locally and attempt to link it into other projects of ours, I get a build error due to a mismatch in runtime library type. Is it possible for me to locally change the type of runtime library that llfio requests? I'm not looking for a change to be made in the source; it's just not clear to me (please pardon my ignorance) what is generating the /MDd compiler flag and how to change it.

[ned14]

https://github.com/ned14/quickcpplib/blob/master/cmakelib/QuickCppLibSetupProject.cmake#L57 should work, albeit it probably hasn't been tested in many years.

[tastewar]

Thanks, Niall. Do I need to somehow set that property (CXX_STATIC_RUNTIME) in a top level cmake file? I apologize that cmake is not my best language...

[ned14]

Just set it as a property on the targets.

cmake added years later their own CMAKE_MSVC_RUNTIME_LIBRARY, but that custom CXX_STATIC_RUNTIME property also works on ELF and other non-MSVC toolchains so we ended up supporting both.

[BurningEnlightenment]

I've refactored the CMake build system years ago to also respect CMAKE_MSVC_RUNTIME_LIBRARY

[tastewar]

Thanks, @BurningEnlightenment . This sounds like the simple and more compatible way to go, but in my initial attempt, after reading that the CMake variable has to be done after CMP0091 is set to NEW, I added the following line to CMakeLists.txt, directly after the include(QuickCppLibPolicies):

set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$CONFIG:Debug:Debug>")

But I get a link error when building:

unresolved external symbol __imp_rand_s referenced in function "public: static class outcome_v2::basic_result<oh_my_god_it_goes_on_for_lines_with_many_angle_brackets_colons_and_underscores>"

Googling that error yielded me similar situations -- people trying to convert complex, layered, CMake project to use MSVC static runtime, but no real solution.

[BurningEnlightenment]

Do not set these variables within your CMakeLists.txt. They are meant to be set via commandline switches or toolchain files.

[BurningEnlightenment]

Btw. have you considered using llfio via vcpkg?

[tastewar]

Thanks for this. We use conan inhouse, and not vcpkg, so hoping to get this to build with conan. Niall mentioned the vcpkg earlier -- where is the "source" for that packaging?

[BurningEnlightenment]

You can find the current vcpkg portfiles over here: https://github.com/microsoft/vcpkg/tree/master/ports/llfio

[tastewar]

Thanks for all the info. We've moved over to using the header only build, with LLFIO_EXPERIMENTAL_STATUS_CODE=1 and are now able to build on Linux and Windows. w00t!