Disabling JVM features like for example jvmci or cds

[Baesken, Matthias]

Hi, I wanted to try to build a JVM on Linux x86_64 with JVMCI disabled (just to check how the JVM behaves in a test).
The configure help output shows a long  list how to enable those features

  --enable-jvm-feature-cds
                          enable jvm feature 'cds' (enable class data sharing (CDS))
  --enable-jvm-feature-compiler1
                          enable jvm feature 'compiler1' (enable hotspot compiler C1)
  --enable-jvm-feature-compiler2
                          enable jvm feature 'compiler2' (enable hotspot compiler C2)
  --enable-jvm-feature-dtrace
                          enable jvm feature 'dtrace' (enable dtrace support)
  --enable-jvm-feature-epsilongc
                          enable jvm feature 'epsilongc' (include the epsilon (no-op) garbage collector)
  --enable-jvm-feature-g1gc
                          enable jvm feature 'g1gc' (include the G1 garbage collector)
  --enable-jvm-feature-jfr
                          enable jvm feature 'jfr' (enable JDK Flight Recorder (JFR))
  --enable-jvm-feature-jni-check
                          enable jvm feature 'jni-check' (enable -Xcheck:jni support)
  --enable-jvm-feature-jvmci
                          enable jvm feature 'jvmci' (enable JVM Compiler Interface (JVMCI))
  --enable-jvm-feature-jvmti
                          enable jvm feature 'jvmti' (enable Java Virtual Machine Tool Interface (JVM TI))
   ….

For disabling it seems the syntax  --enable-jvm-feature-jvmci=no  seems to work .
Looking into  make/autoconf/jvm-features.m4  this seems to be true for all  JVM features .
Should we add this to the help output  ?
Would be useful to have some sentence like  --enable-jvm-feature-<name>=no   can be used to disable a JVM feature .
Should we add this to the configure help  ?

Thanks, Matthias


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