[flang] [clang] [flang][windows] Add option to link against specific MSVC CRT (PR #70833)

[David Truby via cfe-commits]

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@@ -53,3 +53,26 @@ add_flang_library(FortranDecimal INSTALL_WITH_TOOLCHAIN
   binary-to-decimal.cpp
   decimal-to-binary.cpp
 )
+
+if (DEFINED MSVC)
+  set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)
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DavidTruby wrote:

Yeah I tried this but inside add_flang_library these are made into custom targets (meaning the target property doesn’t do anything) and I’m not entirely sure why so I didn’t want to mess with it too much. I’ll give it another try

https://github.com/llvm/llvm-project/pull/70833