GCJ & GCC, MingW

This is a discussion on GCJ & GCC, MingW within the A Brief History of Cprogramming.com forums, part of the Community Boards category; I've just recently heard of a GNU compiler tool called GCJ that can compile Java byte code into a target ...

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    GCJ & GCC, MingW

    I've just recently heard of a GNU compiler tool called GCJ that can compile Java byte code into a target machine native language. After visiting the website I am led to believe from the downloads section that GCJ is included with GCC. So my question is how does one invoke the GCJ compiler through GCC or MingW?

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    Crazy Fool Perspective's Avatar
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    I'm not so sure it get's packaged with the default download of gcc, it's just part of the gcc project. The name of the executable is gcj and libgcj is the library. IIRC, it's linux only.

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    I am also interested in some experiences with gjc.

    Is java then nearly fast as it would be written in C or C++?

    From my understanding of the wiki article, gjc is currently only experimental. Isn`t fully compatible with jre and therefore not all librarys are working?

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    S Sang-drax's Avatar
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    Quote Originally Posted by sept View Post
    Is java then nearly fast as it would be written in C or C++?
    It would still work a little differently, with garbage collection and such.
    Last edited by Sang-drax : Tomorrow at 02:21 AM. Reason: Time travelling

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    Cat without Hat CornedBee's Avatar
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    Actually, I heard that GCJ has received so little attention that it is not very optimized; supposedly the native code generated by GCJ is slower than Sun's JVM.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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    Uhm, that`s worse. Then the only advantage is that you don`t need jre and save a lot of support querys that either jre is not installed or can not be installed for strange reasons.

    Please split this if that`s going to much off topic.

    What about the commercial java to native compilers? Are them better then jre (forget in meanwhile about portability)?

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    Registered User Frobozz's Avatar
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    Quote Originally Posted by Perspective
    The name of the executable is gcj and libgcj is the library. IIRC, it's linux only.
    No it isn't. I've used it under MinGW just fine although I never did much with it. If you want it, just grab gcc-java-3.4.5-20060117-1.tar.gz and uncompress it into where mingw is.

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    awesome thanks!
    Any links that corroborate the snag about compiled native code being less effecient than byte code/JVM?
    Also, are there any other libraries/compilers that do the same thing? (JDK can't right?)

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    Cat without Hat CornedBee's Avatar
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    Here's some numbers. This test looks extensive and rather fair:
    http://www.shudo.net/jit/perf/

    There is only one test where gcj beats the Sun JVM, and that's the Sieve of Eratosthenes. In all others, gcj is slower, sometimes by quite a margin.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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