AVAILABLE CONFIGURATIONS ^^^^^^^^^^^^^^^^^^^^^^^^ arm-defconfig Builds an ARM toolchain using gcc 3.4.5 arm7tdmi-defconfig-4.2.4 arm920t-defconfig-4.2.4 arm926t-defconfig-4.2.4 Builds an ARM toolchain using gcc 4.2.4. This configuration builds both gcc and g++. There are three versions: one for arm7tdmi (armv4t), arm920t (armv4t) and arm926t (arv5t) because of differences in the way that soft floating is handled in between the armv4t and arm5t architectures. NOTE: The newer versions of GCC generate new sections and can cause some problems for NuttX configurations developed under older toolchains. In particular, arm-elf-objcopy may fail with strange errors. If this occurs, try adding the following arguments to the arm-elf-objcopy command "-R .note -R .note.gnu.build-id -R .comment" This logic is several configuration Make.defs files: HOSTOS = ${shell uname -o} ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q'} ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1} ifeq ($(ARCHCCMAJOR),4) ifneq ($(HOSTOS),Cygwin) OBJCOPYARGS = -R .note -R .note.gnu.build-id -R .comment endif endif This change probably applies to other architectures as well (?) arm920t-defconfig-4.3.3 Builds an ARM toolchain using gcc 4.3.3. This configuration builds both gcc and g++ for the arm920t (armv4t). It is an update to arm920t-defconfig-4.2.4 (see notes above). avr-defconfig-4.3.3 Builds an AVR toolchain using gcc 4.3.3. This configuration builds both gcc and g++ for the AVR (armv4t). This toolchain is intended to support the NuttX ATmega128 port. cortexm3-defconfig-4.3.3 Builds an ARM toolchain for the Cortex-M3 using gcc 4.3.3. This configuration builds both gcc and g++. cortexm3-defconfig-nxflat This configuration build an NXFLAT toolchain (only) for use with the Cortex-M3 bfin-defconfig-4.2.4 Builds an Blackfin toolchain using gcc 4.2.4 h8300_config Builds an H8/300 toolchain using gcc 3.4.5 m68hc11-config Builds an hc11 toolchain using gcc 3.4.5 m68k-config Builds an M68K toolchain using gcc 3.4.5 sh-defconfig Builds an SH-1/2 toolchain using gcc 3.4.5 GENERAL BUILD STEPS ^^^^^^^^^^^^^^^^^^^ 1. Configure your host machine. You host PC should have a relatively complete C development environment. I don't have a full list of the package requirements. The later tool chains also require GMP and MPRF development packages or the build will fail with errors like: "configure: error: Building GCC requires GMP 4.1+ and MPFR 2.3.0+. ... Copies of these libraries' source code can be found at their respective hosting sites as well as at ftp://gcc.gnu.org/pub/gcc/infrastructure/. See also http://gcc.gnu.org/install/prerequisites.html for additional info. If you obtained GMP and/or MPFR from a vendor distribution package, make sure that you have installed both the libraries and the header files. They may be located in separate packages." You should try your package manager for whatever Linux version you are using first. The header files are normally included in versions of the packages that have "-devel" in the package name. 2. CD to the correct directory. Change to the directory just above the NuttX installation. If is where NuttX is installed, then cd to /.. 3. Get and Install the buildroot Module a. Using a release tarball: cd /.. Download the appropriate buildroot package. unpack the buildroot package rename the directory to buildroot b. Using CVS Check out the misc/buildroot module. CVS checkout instructions: cvs -d:pserver:anonymous@nuttx.cvs.sourceforge.net:/cvsroot/nuttx login cvs -z3 -d:pserver:anonymous@nuttx.cvs.sourceforge.net:/cvsroot/nuttx co -P misc/buildroot Move the buildroot Source Tree and create the archive directory mv misc/buildroot . Make the archive directory: mkdir archive The /../buildroot is where the toolchain is built; The /../archive directory is where toolchain sources will be downloaded. 4. Make sure that NuttX is configured cd /tools ./configure.sh 5. Configure and Make the buildroot cd buildroot cp configs/ .config make oldconfig make This will download the large source packages for the toolchain and build the toolchain. The resulting binaries will be under buildroot/build_. There will also be a large build directory called something like toolchain_build_; this directory can be removed once the build completes successfully. Where is one of the configuration files listed above and is an archtecture name. Examples: build_m32c, build_arm_nofpu, etc. Cygwin GCC BUILD NOTES ^^^^^^^^^^^^^^^^^^^^^^ On Cygwin, the buildroot 'make' command will fail with an error like: "... build/genchecksum cc1-dummy > cc1-checksum.c opening cc1-dummy: No such file or directory ..." This is caused because on Cygwin, host executables will be generated with the extension .exe and, apparently, the make variable "exeext" is set incorrectly. A work around after the above occurs is: cd toolchain_build_/gcc-4.2.4-build/gcc # Go to the directory where error occurred mv cc1-dummy.exe cc1-dummy # Rename the executable without .exe rm cc1-checksum.c # Get rid of the bad generated file Then resume the buildroot make: cd - # Back to the buildroot make directory make # Restart the build If you build g++, you will see another similar error: ... build/genchecksum cc1plus-dummy > cc1plus-checksum.c opening cc1plus-dummy: No such file or directory ... The fix is similar: cd toolchain_build_/gcc-4.2.4-build/gcc # Go to the directory where error occurred mv cc1plus-dummy.exe cc1plus-dummy # Rename the executable without .exe rm cc1plus-checksum.c # Get rid of the bad generated file Then resume the buildroot make: cd - # Back to the buildroot make directory make # Restart the build