Bootstrapping fbc on a new system



fbc is written in FB itself, so you need a working fbc to build a new fbc. How to do this on a system where no working fbc exists yet? There are two options: pre-compiling (by cross-compiling) the fbc sources on a system where you have a working fbc and then taking the results to the target system, or full cross-compiling using a gcc cross-compiler toolchain.

Bootstrapping using the FreeBASIC-x.xx.x-source-bootstrap package (if available)

The FreeBASIC-x.xx.x-source-bootstrap package contains the FB sources plus precompiled compiler sources, for multiple targets. After extracting, this can be built without requiring an existing fbc:
make bootstrap


(as long as the package contains the precompiled sources for the target system)

This package can be created by running:
make bootstrap-dist


Doing make bootstrap-dist, taking the package to the target system, and then doing make bootstrap can replace the manual steps below, as long as the target is already supported by these commands in the FB makefile.

Bootstrapping by precompiling the compiler sources

  1. On Linux or Win32 (or another system where you have a working fbc), use the existing fbc to cross-compile src/compiler/*.bas into *.asm (-gen gas, x86 only) or *.c (-gen gcc, works for every target) files compatible to the target system:
  2. fbc -e -m fbc src/compiler/*.bas -r -target <mytargetos> -arch <mytargetarch>
    		
    Some random examples:
    x86 Win32 -> x86 OpenBSD: -target openbsd [-arch 486]
    x86 Win32 -> x86_64 FreeBSD: -target freebsd -arch x86_64
    x86 Linux -> ARM Linux: -target arm-linux-gnueabihf, or just -arch armv6


  3. On the target system, compile FB's rtlib/gfxlib2 using the native C compiler as usual:
  4. make rtlib gfxlib2


  5. Take the .asm or .c files (produced in the first step) to the target system, and use the target system's native tools to build the final fbc executable:
    • If you produced .asm files, take them to the target system, and assemble them into *.o object files using the target system's native assembler, and then link everything into a new fbc executable:
    • for i in src/compiler/*.asm; do
      as $i -o `echo $i | sed -e 's/asm$/o/g'`
      done
      
      gcc -o fbc lib/freebasic/<mytargetarch>/fbrt0.o src/compiler/*.o -Llib/freebasic/<mytargetarch> -lfb -lncurses -lm -pthread

    • If you produced .c files, take them to the target system, and compile them into a new fbc executable:
    • gcc -o fbc -nostdinc -Wall -Wno-unused-label -Wno-unused-function -Wno-unused-variable -Wno-unused-but-set-variable -Wno-main -fno-strict-aliasing -frounding-math lib/freebasic/<mytargetarch>/fbrt0.o src/compiler/*.c -Llib/freebasic/<mytargetarch> -lfb -lncurses -lm -pthread


Additional notes & tips
Bootstrapping by cross-compiling everything

If you're on Linux or Win32 or another system where you already have a working fbc, and you have a gcc cross-compiler toolchain for the target system, and the libraries needed to link an fbc for the target system (libc, libpthread, etc. and libncurses/libtinfo), then you can directly cross-compile an FB setup like so:

  1. Build a native FB setup with additional libraries for cross-compiling to the target system:
  2. # Get a directory with the fbc sources, e.g. "fbc"
    cd fbc
    make
    make rtlib gfxlib2 TARGET=<gcc-target-id>
    
    # Optionally, you can install everything into /usr/local:
    make install
    make install-rtlib install-gfxlib2 TARGET=<gcc-target-id>


  3. Use the native FB setup built above to cross-compile the new FB setup for the target system:
  4. cd ..
    mkdir crosscompiled-fbc && cd crosscompiled-fbc
    make -f ../fbc/makefile FBC='../fbc/bin/fbc -i ../fbc/inc' TARGET=<gcc-target-id>
    # (Specifying FBC=... is only needed if you did not install it globally)


Cross-compiling the 64bit version on a 32bit system with gcc -m64

If you have a gcc multilib toolchain with -m64 support on a 32bit system, you can use it to cross-compile the 64bit version of FB. For example, on 32bit Ubuntu (GNU/Linux), you can install the gcc-multilib package to install the gcc -m64 support. The Win32 gcc toolchains from the MinGW-w64 project also have support for cross-compiling to 64bit via gcc -m64.

# Get FB sources into fbc/ (must be 0.91+ because earlier versions didn't support multilib/64bit at all),
# and build a native (32bit) FB first
cd fbc
make

# Then add the 64bit rtlib/gfxlib2 to that. Specifying MULTILIB=64 tells the FB makefile to use gcc -m64.
make rtlib gfxlib2 MULTILIB=64

# Now we have a new 32bit FB with 64bit libraries for cross-compiling.
# This can now be used to build a full 64bit FB:
cd ..
mkdir fbc64
cd fbc64
make -f ../fbc/makefile MULTILIB=64 FBC='../fbc/bin/fbc -i ../fbc/inc'


This does not only work with gcc -m64 on 32bit, but also with gcc -m32 on 64bit. For cross-compiling the 32bit FB on a 64bit system, just exchange 32 and 64 in the example above. For example, you have to specify MULTILIB=32 instead of MULTILIB=64.

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