[gentoo-dev] Re:[gentoo-dev]compilingjavavs.binary

[Joseph Booker]

Bruno Dufour said:
> On Wed, Mar 17, 2004 at 05:42:17PM -0800, Robin H. Johnson wrote:
>> On Wed, Mar 17, 2004 at 07:27:41PM -0600, Joseph Booker wrote:
>> > Im wondering if java programs in portage really require to be
>> compiled, I
>> > dont no of any that i use (mainly just the jdk and jedit) that has USE
>> > flags or anything like that that changes the files compiled, so whats
>> the
>> > point of having them compiled when the binary versions would be just
>> the
>> > same on any arch?
>> In theory the output SHOULD be the same, but in practice this is not
>> always true, esp. when you tell javac to compile with optimizations or
>> debugging. Also, you have to contend with the non-standard javac options
>> (try javac -X with various different javac, esp. across multiple
>> platforms).
>
> Well, AFAIK, javac always uses optimization. The -O option is still
> there for compatibility reasons, but it does not do anything.  This has
> been the case for quite a while. I agree with your point though. There
> are many features that can be tweaked when using a java compiler (the
> jikes compiler is even more configurable than javac). Some compilers
> (like javac from Sun's J2DK) are not even available on all platforms.
> Even if you don't want to tweak the output, different compilers generate
> different class files, and have different optimization strategies.  Some
> picky tools/jvms also have incompatibilities with the classes that are
> generated from certain compilers.
>
> Compiling from source therefore gives you quite a lot of freedom.
>

hmmm.....mayb there should be an option then concerning what options to
pass to the compiler? (JFLAGS or osmething)

-- 
 Joe Booker

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