[flang-commits] [clang] [flang] [flang][Driver] Add support for -f[no-]wrapv and -f[no]-strict-overflow in the frontend (PR #110061)

[Yusuke MINATO via flang-commits]

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@@ -866,6 +866,17 @@ void Flang::ConstructJob(Compilation &C, const JobAction &JA,
     }
   }
 
+  // -fno-strict-overflow implies -fwrapv if it isn't disabled, but
+  // -fstrict-overflow won't turn off an explicitly enabled -fwrapv.
+  if (Arg *A = Args.getLastArg(options::OPT_fwrapv, options::OPT_fno_wrapv)) {
+    if (A->getOption().matches(options::OPT_fwrapv))
+      CmdArgs.push_back("-fwrapv");
+  } else if (Arg *A = Args.getLastArg(options::OPT_fstrict_overflow,
+                                      options::OPT_fno_strict_overflow)) {
+    if (A->getOption().matches(options::OPT_fno_strict_overflow))
+      CmdArgs.push_back("-fwrapv");
+  }
+
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yus3710-fj wrote:

Thank you for showing me a better way.
I created a function `renderIntegerOverflowOptions` to handle common options between clang and flang. However, I'm not sure the name of the function is appropriate because there are other related options handled only by clang (e.g. `-ftrapv`).

https://github.com/llvm/llvm-project/pull/110061