Notes about compiling gcj 3.4.4 for Windows

[Andi Vajda <andi at osafoundation dot org>]

Today I cross-compiled gcc/gcj 3.4.4 for Windows following Ranjit Mathew's 
directions at http://ranjitmathew.hostingzero.com/phartz/gcj/bldgcj.html

First of all, thank you Ranjit, doing this on Linux this is *sooo* much nicer 
than on cygwin + mingw + msys + windows.

I used the 3.4.4 gcc sources from the mingw.org download site.

There were a few issues along the way that I worked around as follows:

  - The directions refer to $TARGET for creating directories.
    TARGET better be set to 'mingw32'.

  - In both cfgxgcc.sh and cfgwingcc.sh I added --enable-sjlj-exceptions to
    the configure script invocation. Without this, I get an error in
    crtstuff.c, line 607, something with SI being an invalid mode for type.

  - In mkwingcc.sh I added 'export JAR=$XGCC_DIR/bin/$TARGET-jar' and I edited
    $WINGCC_BUILD_DIR/mingw32/libjava/Makefile to have ZIP = $(JAR). Without
    this, the build process invokes whatever jar command is on your path on
    Linux and that may or may not understand all the flags passed to it.

  - After all is built and installed I had to move $PREFIX/lib/libgcj.spec to
    $PREFIX/lib/gcc/mingw32/3.4.4/ otherwise gcj would complain about not
    finding libgcj.spec when run on Windows.

  - On Windows, I also had to add a -L flag to my g++ invocation for the
    linker to find -lgcj

Other than that, Ranjit's scripts and directions are correct and invaluable.

Many thanks !

Andi..