GHA CI: add test for -fcf-protection=branch on x86-64

Author: xavierleroy

.github/workflows/build.yml

@@ -42,6 +42,8 @@ jobs:
         run: tools/runner.sh test2
       - name: Test alternate configuration 2
         run: tools/runner.sh test3
+      - name: Test alternate configuration 3
+        run: tools/runner.sh test4
   macos:
     runs-on: macos-latest
     env:
@@ -68,3 +70,5 @@ jobs:
         run: tools/runner.sh test2
       - name: Test alternate configuration 2
         run: tools/runner.sh test3
+      - name: Test alternate configuration 3
+        run: tools/runner.sh test4

tools/runner.sh

@@ -218,6 +218,7 @@ case "$target,$os" in
       1) Run_test "" "";;
       2) Run_test "" "-fpic";;
       3) Run_test "" "-Os -fno-pie -no-pie";;
+      4) Run_test "" "-fcf-protection=branch";;
     esac;;
   *)
     Fatal "Unknown configuration \"$target\" - \"$os\""
@@ -238,6 +239,7 @@ case "$1" in
   test1) Run_test_round 1;;
   test2) Run_test_round 2;;
   test3) Run_test_round 3;;
+  test4) Run_test_round 4;;
   build_ccomp) Build_ccomp;;
   check_proof) Check_proof;;
   hygiene) Hygiene;;