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

[Brad King via cfe-commits]

================
@@ -976,12 +976,46 @@ bool tools::addOpenMPRuntime(ArgStringList &CmdArgs, 
const ToolChain &TC,
   return true;
 }
 
-void tools::addFortranRuntimeLibs(const ToolChain &TC,
+void tools::addFortranRuntimeLibs(const ToolChain &TC, const ArgList &Args,
                                   llvm::opt::ArgStringList &CmdArgs) {
   if (TC.getTriple().isKnownWindowsMSVCEnvironment()) {
-    CmdArgs.push_back("Fortran_main.lib");
-    CmdArgs.push_back("FortranRuntime.lib");
-    CmdArgs.push_back("FortranDecimal.lib");
+    CmdArgs.push_back(Args.MakeArgString(
+        "/DEFAULTLIB:" + TC.getCompilerRTBasename(Args, "builtins")));
+    unsigned RTOptionID = options::OPT__SLASH_MT;
+    if (auto *rtl = Args.getLastArg(options::OPT_fms_runtime_lib_EQ)) {
+      RTOptionID = llvm::StringSwitch<unsigned>(rtl->getValue())
+                       .Case("static", options::OPT__SLASH_MT)
+                       .Case("static_dbg", options::OPT__SLASH_MTd)
+                       .Case("dll", options::OPT__SLASH_MD)
+                       .Case("dll_dbg", options::OPT__SLASH_MDd)
+                       .Default(options::OPT__SLASH_MT);
----------------
bradking wrote:

The switch accepts names `static,static_dbg,dll,dbg_dll`.  Should we use 
matching names for the `FortranRuntime.*.lib` variants?


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