[Bug 3652] [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

--- Comment #1 from hg commits <mercurial at icedtea.classpath.org> ---
details:
http://icedtea.classpath.org//hg/release/icedtea7-2.6?cmd=changeset;node=9615e77f53ef
author: Andrew John Hughes <gnu_andrew at member.fsf.org>
date: Sat Nov 24 03:43:26 2018 +0000

    PR3652: Detect whether -Xprefer:source and -J-Xmx<limit> can be used,
rather than assuming

    2018-11-23  Andrew John Hughes  <gnu_andrew at member.fsf.org>

        PR3652: Detect whether -Xprefer:source
        and -J-Xmx<limit> can be used, rather than assuming
        * Makefile.am:
        (PREFER_SOURCE): Define if
        COMPILER_SUPPORTS_XPREFERSOURCE is set
        by configure.
        (MEMORY_LIMIT): Define if
        COMPILER_SUPPORTS_MAX_HEAP_SIZE is set
        by configure.
        * NEWS: Updated.
        * acinclude.m4:
        (IT_DIAMOND_CHECK): Use 'the Java compiler'
        rather than 'javac' to avoid confusion with
        the OpenJDK command.
        (IT_UNDERSCORE_CHECK): Likewise.
        (IT_JAVAC_OPTIONS_CHECK): Check whether the
        selected Java compiler supports -Xprefer:source
        and -J-Xmx.
        * configure.ac: Invoke IT_JAVAC_OPTIONS_CHECK.

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