Merge pull request ibmruntimes#357 from keithc-ca/crac-criu

Improve interaction between CRIU and CRaC configuration options

Author: pshipton

closed/autoconf/custom-hook.m4

@@ -40,8 +40,7 @@ AC_DEFUN_ONCE([CUSTOM_EARLY_HOOK],
   OPENJ9_PLATFORM_SETUP
   OPENJ9_CONFIGURE_CMAKE
   OPENJ9_CONFIGURE_COMPILERS
-  OPENJ9_CONFIGURE_CRAC_SUPPORT
-  OPENJ9_CONFIGURE_CRIU_SUPPORT
+  OPENJ9_CONFIGURE_CRAC_AND_CRIU_SUPPORT
   OPENJ9_CONFIGURE_CUDA
   OPENJ9_CONFIGURE_DDR
   OPENJ9_CONFIGURE_DEMOS
@@ -343,57 +342,86 @@ AC_DEFUN([OPENJ9_PLATFORM_EXTRACT_VARS_FROM_CPU],
   esac
 ])
 
-AC_DEFUN([OPENJ9_CONFIGURE_CRAC_SUPPORT],
+AC_DEFUN([OPENJ9_CONFIGURE_CRAC_AND_CRIU_SUPPORT],
 [
-  AC_MSG_CHECKING([for CRAC support])
-  AC_ARG_ENABLE([crac-support], [AS_HELP_STRING([--enable-crac-support], [enable CRAC support @<:@platform dependent@:>@])])
-  OPENJ9_ENABLE_CRAC_SUPPORT=false
+  AC_ARG_ENABLE([crac-support], [AS_HELP_STRING([--enable-crac-support], [enable CRaC support @<:@platform dependent@:>@])])
+  AC_ARG_ENABLE([criu-support], [AS_HELP_STRING([--enable-criu-support], [enable CRIU support @<:@platform dependent@:>@])])
+
+  # Complain about explicitly requested, but illegal combinations.
+  if test "x$enable_crac_support" = xyes && test "x$enable_criu_support" = xno ; then
+    AC_MSG_ERROR([--enable-crac-support requires CRIU support])
+  fi
+
+  # Compute platform-specific defaults.
+  case "$OPENJ9_PLATFORM_CODE" in
+    xa64)
+      default_crac=yes
+      default_criu=yes
+      ;;
+    xl64|xr64|xz64)
+      default_crac=no
+      default_criu=yes
+      ;;
+    *)
+      default_crac=no
+      default_criu=no
+      ;;
+  esac
 
+  # Capture the origin of each setting.
   if test "x$enable_crac_support" = xyes ; then
-    AC_MSG_RESULT([yes (explicitly enabled)])
-    OPENJ9_ENABLE_CRAC_SUPPORT=true
+    origin_crac="explicitly enabled"
   elif test "x$enable_crac_support" = xno ; then
-    AC_MSG_RESULT([no (explicitly disabled)])
+    origin_crac="explicitly disabled"
   elif test "x$enable_crac_support" = x ; then
-    case "$OPENJ9_PLATFORM_CODE" in
-      xa64)
-        AC_MSG_RESULT([yes (default)])
-        OPENJ9_ENABLE_CRAC_SUPPORT=true
-        ;;
-      *)
-        AC_MSG_RESULT([no (default)])
-        ;;
-    esac
+    # Adjust if CRUI is explicitly disabled.
+    if test "x$enable_criu_support" = xno && test "x$default_crac" = xyes ; then
+      origin_crac="implicitly disabled"
+      enable_crac_support=no
+    else
+      origin_crac=default
+      enable_crac_support=$default_crac
+    fi
   else
     AC_MSG_ERROR([--enable-crac-support accepts no argument])
   fi
-  AC_SUBST(OPENJ9_ENABLE_CRAC_SUPPORT)
-])
-
-AC_DEFUN([OPENJ9_CONFIGURE_CRIU_SUPPORT],
-[
-  AC_MSG_CHECKING([for CRIU support])
-  AC_ARG_ENABLE([criu-support], [AS_HELP_STRING([--enable-criu-support], [enable CRIU support @<:@platform dependent@:>@])])
-  OPENJ9_ENABLE_CRIU_SUPPORT=false
 
   if test "x$enable_criu_support" = xyes ; then
-    AC_MSG_RESULT([yes (explicitly enabled)])
-    OPENJ9_ENABLE_CRIU_SUPPORT=true
+    origin_criu="explicitly enabled"
   elif test "x$enable_criu_support" = xno ; then
-    AC_MSG_RESULT([no (explicitly disabled)])
+    origin_criu="explicitly disabled"
   elif test "x$enable_criu_support" = x ; then
-    case "$OPENJ9_PLATFORM_CODE" in
-      xa64|xl64|xr64|xz64)
-        AC_MSG_RESULT([yes (default)])
-        OPENJ9_ENABLE_CRIU_SUPPORT=true
-        ;;
-      *)
-        AC_MSG_RESULT([no (default)])
-        ;;
-    esac
+    # Adjust if CRaC is explicitly enabled.
+    if test "x$enable_crac_support" = xyes && test "x$default_criu" = xno ; then
+      origin_criu="implicitly enabled"
+      enable_criu_support=yes
+    else
+      origin_criu=default
+      enable_criu_support=$default_criu
+    fi
   else
     AC_MSG_ERROR([--enable-criu-support accepts no argument])
   fi
+
+  # Report and capture results.
+  AC_MSG_CHECKING([for CRAC support])
+  if test "x$enable_crac_support" = xyes ; then
+    AC_MSG_RESULT([yes ($origin_crac)])
+    OPENJ9_ENABLE_CRAC_SUPPORT=true
+  else
+    AC_MSG_RESULT([no ($origin_crac)])
+    OPENJ9_ENABLE_CRAC_SUPPORT=false
+  fi
+  AC_SUBST(OPENJ9_ENABLE_CRAC_SUPPORT)
+
+  AC_MSG_CHECKING([for CRIU support])
+  if test "x$enable_criu_support" = xyes ; then
+    AC_MSG_RESULT([yes ($origin_criu)])
+    OPENJ9_ENABLE_CRIU_SUPPORT=true
+  else
+    AC_MSG_RESULT([no ($origin_criu)])
+    OPENJ9_ENABLE_CRIU_SUPPORT=false
+  fi
   AC_SUBST(OPENJ9_ENABLE_CRIU_SUPPORT)
 ])