[flang] Add -f[no-]approx-func

Only add the option processing and store the result. No attributes are
added to FIR yet.

Differential Revision: https://reviews.llvm.org/D137326

1 files changed, 6 insertions, 0 deletions

diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index cce97ca..dd461c7 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -708,6 +708,12 @@ static bool parseFloatingPointArgs(CompilerInvocation &invoc,
     opts.NoHonorNaNs = true;
   }
 
+  if (const llvm::opt::Arg *a =
+          args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
+    diags.Report(diagUnimplemented) << a->getOption().getName();
+    opts.ApproxFunc = true;
+  }
+
   return true;
 }