[Bug 3652] New: [IcedTea7] Detect whether -Xprefer:source and -J-Xmx<limit> can be used, rather than assuming

[bugzilla-daemon at icedtea.classpath.org]

https://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3652

            Bug ID: 3652
           Summary: [IcedTea7] Detect whether -Xprefer:source and
                    -J-Xmx<limit> can be used, rather than assuming
           Product: IcedTea
           Version: 2.x-hg
          Hardware: all
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: IcedTea
          Assignee: gnu.andrew at redhat.com
          Reporter: gnu.andrew at redhat.com
                CC: unassigned at icedtea.classpath.org

There is a long-standing limitation in the IcedTea Makefile.am that assumes
that -Xprefer:source and -J-Xmx1024m can be passed in stage 2 / no bootstrap,
but not in the bootstrapping stage, based on the use of gcj to bootstrap.

# This should not depend on bootstrapping                                       
# but on whether MEMORY_LIMIT is accepted                                       
# as an argument to javac                                                       
if BOOTSTRAPPING
  MEMORY_LIMIT =
  PREFER_SOURCE =
else
  MEMORY_LIMIT = -J-Xmx1024m
  PREFER_SOURCE = -Xprefer:source
endif

This causes issues in using other JVMs to bootstrap, and becomes more relevant
now that gcj has been discontinued. We should fix the build so that configure
detects the viability of these options and then uses them if possible.

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