Enable Flang by default in the test-release.sh script

[awarzynski]

Summary

I've also brought this up on llvm-dev:

https://lists.llvm.org/pipermail/llvm-dev/2021-July/151744.html

[rovka]

LGTM.

llvm/utils/release/test-release.sh

175

Minor nitpick: Should we error out if people explicitly pass -no-mlir but not -no-flang?

[Leporacanthicus]

llvm/utils/release/test-release.sh

175

Or like "libs" which only looks at the other libs if the overall libs are enabled, so flang would go inside the mlir part.

Not sure which is more natural. You almost certainly don't want flang if you have said no to MLIR.

[awarzynski]

Make sure that we don't try building Flang with MLIR disabled

[awarzynski]

@rovka , @Leporacanthicus - good point, thank you!

llvm/utils/release/test-release.sh

 do_libcxxabi="yes"
 do_libunwind="yes"
 do_test_suite="yes"
 do_openmp="yes"
 do_lld="yes"
 do_lldb="yes"
 do_polly="yes"
 do_mlir="yes"
-do_flang="no"
+do_flang="yes"
 BuildDir="`pwd`"
 ExtraConfigureFlags=""
 ExportBranch=""
 git_ref=""
 
 function usage() {
     echo "usage: `basename $0` -release X.Y.Z -rc NUM [OPTIONS]"
     echo ""
function usage() {
     echo " -no-libunwind        Disable check-out & build libunwind"
     echo " -no-test-suite       Disable check-out & build test-suite"
     echo " -no-openmp           Disable check-out & build libomp"
     echo " -no-lld              Disable check-out & build lld"
     echo " -lldb                Enable check-out & build lldb"
     echo " -no-lldb             Disable check-out & build lldb (default)"
     echo " -no-polly            Disable check-out & build Polly"
     echo " -no-mlir             Disable check-out & build MLIR"
+    echo " -no-flang            Disable check-out & build Flang"
 }
 
 while [ $# -gt 0 ]; do
     case $1 in
         -release | --release )
             shift
             Release="$1"
             Release_no_dot="`echo $1 | sed -e 's,\.,,g'`"
case $1 in
             ;;
         -no-lldb )
             do_lldb="no"
             ;;
         -no-polly )
             do_polly="no"
             ;;
         -no-mlir )
             do_mlir="no"
             ;;
-        -flang )
-            do_flang="yes"
+        -no-flang )
+            do_flang="no"
             ;;
         -help | --help | -h | --h | -\? )
             usage
             exit 0
             ;;
         * )
             echo "unknown option: $1"
             usage
             exit 1
             ;;
     esac
     shift
 done
 
+if [ $do_mlir = "no" ] && [ $do_flang = "yes" ]; then
+  echo "error: cannot build Flang without MLIR"
+  exit 1
+fi
+
 # Check required arguments.
 if [ -z "$Release" ]; then
     echo "error: no release number specified"
     exit 1
 fi
 if [ -z "$RC" ]; then
     echo "error: no release candidate number specified"
     exit 1