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  1. JDK
  2. JDK-8210703

vmStructs.cpp compiled with -O0

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    • b12

    Backports

      Description

        For the JDK 8 build vmStructs.o is compiled with default optimization level, which is -O3 for release. In JDK 9+ it's being compiled with -O0. It appears this was a porting artifact of this change:

        http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/e796d52ca85b

        The intention was to add -fno-var-tracking-assignments for vmStructs's compilation. But since the old build overwrote default opt flags when per-file overrides get added the port of the change to the JDK 9+ build system added explicit -O0. The former seems intentional the latter not so much.

        More info here:
        http://mail.openjdk.java.net/pipermail/build-dev/2018-September/023216.html

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8212069 vmStructs.cpp compiled with -O0

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8114853 variable tracking size limit exceeded in vmStructs.cpp

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

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                sgehwolf Severin Gehwolf
                sgehwolf Severin Gehwolf
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