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  1. JDK
  2. JDK-8077364

"if( !this )" construct prevents build on Xcode 6.3

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    • Subcomponent:
    • Resolved In Build:
      b64
    • CPU:
      x86_64
    • OS:
      os_x

      Backports

        Description

        Yesterday I updated to the latests Xcode 6.3 which brought Clang 6.1 to my
        machine. Later I tried to build jdk9 and ran into this thing:

            error: 'this' pointer cannot be null in well-defined C++ code; pointer may be
            assumed to always convert to true [-Werror,-Wundefined-bool-conversion]

        Caused by this :

            if (!this)...

        I've found 2 files are affected by this problem:

           * dev/hotspot/src/share/vm/libadt/set.cpp:60
           * dev/hotspot/src/share/vm/adlc/formssel.cpp:3395

        Code around those lines doesn't seem to have changed since 2007 (at least).
        Unfortunately I'm not familiar with C++, and in order to build jdk9 I googled a
        bit and found that dereferencing a null pointer in this case would lead to an
        undefined behaviour. So I'm asking you whether these conditionals are needed or
        it's something we can remove. (For now I commented them out from my working
        copy).

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            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-8082663 "if( !this )" construct prevents build on Xcode 6.3

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

            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-8237379 "if( !this )" construct prevents build on Xcode 6.3

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

            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-8239629 "if( !this )" construct prevents build on Xcode 6.3

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

            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-8264086 "if( !this )" construct prevents build on Xcode 6.3

            • 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-8055838 Hotspot does not compile with clang 6.0 (OS X Yosemite)

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8138820 JDK Hotspot build fails with Xcode 7.0.1

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

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                Assignee:
                sla Staffan Larsen (Inactive)
                Reporter:
                prappo Pavel Rappo
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                  Updated:
                  Resolved: