[flang] Modifications to ieee_support_standard (#125967)

The result of a call to ieee_support_halting is one of the components
that affect the result of a call to ieee_support_standard.

Author: vdonaldson

flang/include/flang/Evaluate/target.h

@@ -143,9 +143,10 @@ class TargetCharacteristics {
   std::string compilerOptionsString_;
   std::string compilerVersionString_;
   IeeeFeatures ieeeFeatures_{IeeeFeature::Denormal, IeeeFeature::Divide,
-      IeeeFeature::Flags, IeeeFeature::Inf, IeeeFeature::Io, IeeeFeature::NaN,
-      IeeeFeature::Rounding, IeeeFeature::Sqrt, IeeeFeature::Standard,
-      IeeeFeature::Subnormal, IeeeFeature::UnderflowControl};
+      IeeeFeature::Flags, IeeeFeature::Halting, IeeeFeature::Inf,
+      IeeeFeature::Io, IeeeFeature::NaN, IeeeFeature::Rounding,
+      IeeeFeature::Sqrt, IeeeFeature::Standard, IeeeFeature::Subnormal,
+      IeeeFeature::UnderflowControl};
 };
 
 } // namespace Fortran::evaluate

flang/include/flang/Tools/TargetSetup.h

@@ -25,8 +25,6 @@ namespace Fortran::tools {
 
   const llvm::Triple &targetTriple{targetMachine.getTargetTriple()};
 
-  targetCharacteristics.set_ieeeFeature(evaluate::IeeeFeature::Halting, true);
-
   if (targetTriple.getArch() == llvm::Triple::ArchType::x86_64) {
     targetCharacteristics.set_hasSubnormalFlushingControl(/*kind=*/3);
     targetCharacteristics.set_hasSubnormalFlushingControl(/*kind=*/4);
@@ -37,6 +35,8 @@ namespace Fortran::tools {
     targetCharacteristics.set_haltingSupportIsUnknownAtCompileTime();
     targetCharacteristics.set_ieeeFeature(
         evaluate::IeeeFeature::Halting, false);
+    targetCharacteristics.set_ieeeFeature(
+        evaluate::IeeeFeature::Standard, false);
     targetCharacteristics.set_hasSubnormalFlushingControl(/*kind=*/3);
     targetCharacteristics.set_hasSubnormalFlushingControl(/*kind=*/4);
     targetCharacteristics.set_hasSubnormalFlushingControl(/*kind=*/8);