Hi Magnus,
On 9/03/2020 6:30 pm, Magnus Ihse Bursie wrote:
When reworking the JVM feature handling, I wanted to try to compile
Hotspot with various features enabled/disabled. I quickly found out that
it's not really possible to build hotspot without the serial gc. While
this is not a terribly important use case, I think it's good to be able
to select serial freely, just as with the other collectors.
Really not sure this is a worthwhile exercise.
With this patch it is possible to build a truly minimal JVM using
'configure --with-jvm-variants=custom --with-jvm-features=g1gc'.
Bug: https://bugs.openjdk.java.net/browse/JDK-8240224
WebRev:
http://cr.openjdk.java.net/~ihse/JDK-8240224-building-without-serial-gc/webrev.01
make/ModuleTools.gmk
! TOOL_ADD_PACKAGES_ATTRIBUTE := $(BUILD_JAVA)
$(JAVA_FLAGS_SMALL_BUILDJDK) \
that should be BUILDJDK_JAVA_FLAGS_SMALL.
make/RunTestsPrebuiltSpec.gmk
make/autoconf/boot-jdk.m4
! BUILDJDK_JAVA_FLAGS_SMALL := -Xms32M -Xmx512M -XX:TieredStopAtLevel=1
Depending on the default GC those -Xms and -Xmx settings may not be
valid/possible.
Other changes seem okay but I'll leave it for GC folk to comment on that.
Cheers,
David
/Magnus
