New and (hopefully) improved javac.in

[C. K. Jester-Young]

Hi there,

A while ago, in a thread with Mark, I mentioned that I found it odd that
when using ecj to compile, this message kept coming up:

incorrect classpath: hotspot-tools/com/sun/codemodel/internal/ClassType.java

I figured at the time that it was because ecj was treating the
"-bootclasspath '' @hotspot-tools-source-files.txt" as simply
"-bootclasspath @hotspot-tools-source-files.txt", losing the empty
argument. It turns out that the javac wrapper shell script lost the
empty argument in its argument handling.

I have thus written a new javac wrapper script. It uses Perl, rather
than shell, because I figured this to be more portable than relying on
a shell with proper array support (read: different versions of bash
differed on how arrays are supported). And without arrays, keeping empty
arguments intact would be very difficult.

I have endeavoured to keep to the spirit of the original javac.in; any
comments would be welcome.

Cheers,
	---Chris K.
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