[13] RFR (S): 8217404: --with-jvm-features doesn't work when multiple features are explicitly disabled

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8217404/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8217404

--with-jvm-features doesn't work properly when multiple features are 
explicitly disabled:

$ bash configure --with-jvm-features="-aot -jvmci -graal"
...
checking if jvmci module jdk.internal.vm.ci should be built... yes
checking if graal module jdk.internal.vm.compiler should be built... yes
checking if aot should be enabled... yes
...

The problem in the following code:

   DISABLE_AOT=`$ECHO $DISABLED_JVM_FEATURES | $GREP aot`
   if test "x$DISABLE_AOT" = "xaot"; then
     ENABLE_AOT="false"
   fi

Since DISABLED_JVM_FEATURES ("aot jvmci graal") contains the list of 
explicitly disabled features, grep over it returns the whole list when 
there's a match. The subsequent check fails because there's no exact 
match, though DISABLE_AOT contains "aot" .

Proposed fix is to check there's no match instead.

After the fix it works as expected:

$ bash configure --with-jvm-features="-aot -jvmci -graal"
...
checking if jvmci module jdk.internal.vm.ci should be built... no, forced
checking if graal module jdk.internal.vm.compiler should be built... no, 
forced
checking if aot should be enabled... no, forced
...

(The fix doesn't address the case when one feature has a name which is a 
proper substring of another feature, but there are no such cases at the 
moment.)

Best regards,
Vladimir Ivanov