Linux targeting iSeries
This was one of the most difficult butterflies of all to get into the cage!
I needed a "sysroot" both to build the compiler with, and to use when the compiler actually generates executables. AIX is a proprietary OS, so it is not possible to build an AIX libc library from scratch. As a work around I simply copied a bunch of .h files and library executables from an iSeries with PASE loaded. The source machine was V5R4M0. As an aside, Binutils as at V2.24 is not capable of creating or linking AIX shared library objects. I therefore stripped out anything to do with AIX shared libraries (notably libC and friends as opposed to libc). This also helped with the windows version of the iSeries compiler, because windows isn’t so clever with file name case sensitivity! Note that I have patched some of the PASE header files specifically with respect to large file support. In my humble opinion the original IBM headers were broken with misplaced #ifdef #define and so on for large file support.
Disclaimer – I dunno how legal it is to ship part of OS/400 with this compiler (specifically – the core AIX c libraries in PASE). Which same is why the list of stuff offered may shrink over time!
Buildtools is a collection of things that enable development - like GNU make, autoconf, automake and etc. You don't need this stuff if you already have a working Linux development environment. If you don't, these executables are statically linked against µClibc, and should run just about anywhere.
The actual compiler: Binutils V2.24 GCC V4.8.2, targets AIX 5.1.0.0 which should create PASE / QShell exectables that run on any iSeries from V4R5M0 onwards. This needs to live in /opt/pase.
For the really interested - Build parameters follow: (these builds are always "out of source tree" hence the ../gnuSource). Note that gmp-5.1.3, mpc-1.0.2 and mpfr-3.1.2 were symlinked (or copied if you are on windows) into the gcc-4.8.2 directory as gmp, mpc and mpfr respectively. Compiler lives in /opt/pase, and directory /opt/pase/usr is prepopulated with the iSerises header files and libraris as detailed above.
../gnuSource/binutils-2.24/configure --with-pkgversion=DDT --prefix=/opt/pase --with-sysroot=/opt/pase --target=powerpc-ibm-aix5.1.0.0 --disable-nls --with-lib-path=/opt/pase/usr/lib CFLAGS=-D_ISOC99_SOURCE CXXFLAGS=-D_ISOC99_SOURCE
../gnuSource/gcc-4.8.2/configure --prefix=/opt/pase --with-sysroot=/opt/pase --with-pkgversion=DDT --disable-bootstrap --disable-multilib --disable-nls --target=powerpc-ibm-aix5.1.0.0 --enable-shared=no --disable-lto-plugin --disable-libsanitizer --disable-boehm-gc --disable-libmudflap --disable-libgcj --enable-languages=c,c++,fortran,lto,objc,obj-c++