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configs/skp16c26/README.txt
^^^^^^^^^^^^^^^^^^^^^^^^^^^
BUILDING THE R8C/M16C/M32C GNU TOOLCHAIN
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1. CD to the correct directory.
Change to the directory just above the NuttX installation. If <nuttx-dir> is
where NuttX is installed, then cd to <nuttx-dir>/..
2. Get and Install the buildroot Module
a. Using a release tarball:
cd <nuttx-dir>/..
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 <nuttx-dir>/../buildroot is where the toolchain is built;
The <nuttx-dir>/../archive directory is where toolchain sources will be downloaded.
3. Make sure that NuttX is configured
cd <nuttx-dir>/tools
./configure.sh <nuttx-configuration>
4. Configure and Make the buildroot
cd buildroot
cp configs/m32c-defconfig-4.2.4 .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_m32c. There will also be a
large build directory called toolchain_build_m32c; this directory can be removed once
the build completes successfully.
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_m32c/gcc-4.2.4-initial/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
GCC is built twice. First a initial, "bootstap" GCC is produced in
toolchain_build_m32c/gcc-4.2.4-initial, then the final GCC is produced in
toolchain_build_m32c/gcc-4.2.4-final. The above error will occur twice: Once for
the intial GCC build (see above) and once for the final GCC build. For the final GCC
build, the workaround is the same except that the directory will be
toolchain_build_m32c/gcc-4.2.4-final/gcc.
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