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diff --git a/rsb/cross-canadian-cross.rst b/rsb/cross-canadian-cross.rst new file mode 100644 index 0000000..b085046 --- /dev/null +++ b/rsb/cross-canadian-cross.rst @@ -0,0 +1,98 @@ +.. comment SPDX-License-Identifier: CC-BY-SA-4.0 + +.. comment COPYRIGHT (c) 2012 - 2016. +.. comment Chris Johns <chrisj@rtems.org> + +Cross and Canadian Cross Building +################################# + +Cross building and Canadian Cross building is the process of building on one +machine an executable that runs on another machine. An example is building a +set of RTEMS tools on Linux to run on Windows. The RSB supports cross building +and Canadian cross building. + +This sections details how to the RSB to cross and Canadian cross build. + +Cross Building +~~~~~~~~~~~~~~ + +Cross building is where the _build_ machine and _host_ are different. The +_build_ machine runs the RSB and the _host_ machine is where the output from +the build runs. An example is building a package such as NTP for RTEMS on your +development machine. + +To build the NTP package for RTEMS you enter the RSB command:: + + $ ../source-builder/sb-set-builder \ + --log=log_ntp_arm.txt \ + --prefix=$HOME/development/rtems/4.11 \ <1> + --host=arm-rtems4.11 \ <2> + --with-rtems-bsp=xilinx_zynq_zc706 \ <3> + 4.11/net/ntp + +.. topic:: Items: + + 1. The tools and the RTEMS BSP are installed under the same prefix. + + 2. The ``--host`` command is the RTEMS architecture and version. + + 3. The BSP is built and installed in the prefix. The arhcitecture must match + the ``--host`` architecture. + +.. note: Installing Into Different Directories + + If you install BSPs into a different path to the prefix use the + ``--with-tools`` option to specify the path to the tools. Do not add the + 'bin' directory at the end of the path. + +Canadian Cross Building +~~~~~~~~~~~~~~~~~~~~~~~ + +A Canadian cross builds are where the **build**, **host** and **target** +machines all differ. For example building an RTEMS compiler for an ARM +processor that runs on Windows is built using a Linux machine. The process is +controlled by setting the build triplet to the host you are building, the host +triplet to the host the tools will run on and the target to the RTEMS +architecture you require. The tools needed by the RSB are: + +- Build host C and C++ compiler + +- Host C and C++ cross compiler + +The RTEMS Source Builder requires you provide the build host C and C++ compiler +and the final host C and C++ cross-compiler. The RSB will build the build host +RTEMS compiler and the final host RTEMS C and C++ compiler, the output of this +process. + +The Host C and C++ compiler is a cross-compiler that builds executables for the +host you want the tools for. You need to provide these tools. For Windows a +number of Unix operating systems provide MinGW tool sets as packages. + +The RSB will build an RTEMS tool set for the build host. This is needed when +building the final host's RTEMS compiler as it needs to build RTEMS runtime +code such as *libc* on the build host. + +TIP: Make sure the host's cross-compiler tools are in your path before run the +RSB build command. + +TIP: Canadian Cross built tools will not run on the machine being used to build +them so you should provide the ``--bset-tar-files`` and ``--no-install`` +options. The option to not install the files lets you provide a prefix that +does not exist or you cannot access. + +To perform a cross build add ``--host=`` to the command line. For example +to build a MinGW tool set on FreeBSD for Windows add ``--host=mingw32`` +if the cross compiler is ``mingw32-gcc``:: + + $ ../source-builder/sb-set-builder --host=mingw32 \ + --log=l-mingw32-4.11-sparc.txt \ + --prefix=$HOME/development/rtems/4.11 \ + 4.11/rtems-sparc + +If you are on a Linux Fedora build host with the MinGW packages installed the +command line is:: + + $ ../source-builder/sb-set-builder --host=i686-w64-mingw32 \ + --log=l-mingw32-4.11-sparc.txt \ + --prefix=$HOME/development/rtems/4.11 \ + 4.11/rtems-sparc |