%general-entities; ]> GCC cross tools, static Make a couple of essential adjustments to the specs file to ensure GCC uses our build environment: patch -Np1 -i ../&gcc-specs-patch; Change the StartFile Spec and Standard Include Dir so that GCC looks in /tools: echo -en '#undef STANDARD_INCLUDE_DIR\n#define STANDARD_INCLUDE_DIR "/tools/include/"\n\n' >> gcc/config/linux.h echo -en '\n#undef STANDARD_STARTFILE_PREFIX_1\n#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"\n' >> gcc/config/linux.h echo -en '\n#undef STANDARD_STARTFILE_PREFIX_2\n#define STANDARD_STARTFILE_PREFIX_2 ""\n' >> gcc/config/linux.h Now alter gcc's c preprocessor's default include search path to use /tools only: cp -v gcc/Makefile.in{,.orig} sed -e "s@\(^CROSS_SYSTEM_HEADER_DIR =\).*@\1 /tools/include@g" \ gcc/Makefile.in.orig > gcc/Makefile.in We will create a dummy limits.h so the build will not use the one provided by the host distro: touch /tools/include/limits.h AR=ar LDFLAGS="-Wl,-rpath,/cross-tools/lib" \ ../gcc-&gcc-version;/configure --prefix=/cross-tools \ --build=${CLFS_HOST} --host=${CLFS_HOST} --target=${CLFS_TARGET} \ --with-sysroot=${CLFS} --with-local-prefix=/tools --disable-nls \ --disable-shared --with-mpfr=/cross-tools --with-gmp=/cross-tools \ --with-ppl=/cross-tools --with-cloog=/cross-tools \ --without-headers --with-newlib --disable-decimal-float \ --disable-libgomp --disable-libmudflap --disable-libssp \ --disable-threads --enable-languages=c --disable-multilib --prefix=/cross-tools This tells the configure script to prepare to install the package in the /cross-tools directory. --host=${CLFS_HOST} When used with --target, this creates a cross-architecture executable that creates files for ${CLFS_TARGET} but runs on ${CLFS_HOST}. --target=${CLFS_TARGET} When used with --host, this creates a cross-architecture executable that creates files for ${CLFS_TARGET} but runs on ${CLFS_HOST}. --with-sysroot=${CLFS} Tells GCC to concider ${CLFS} as the root file system. --with-local-prefix=/tools The purpose of this switch is to remove /usr/local/include from gcc's include search path. This is not absolutely essential, however, it helps to minimize the influence of the host system. --disable-nls This disables internationalization as i18n is not needed for the cross-compile tools. --disable-shared Disables the creation of the shared libraries. --without-headers Disables GCC from using the target's Libc when cross compiling. --with-newlib Tells GCC that the target libc will use 'newlib'. --disable-decimal-float Disables support for the C decimal floating point extension. --disable-libgomp Disables the creation of runtime libraries used by GOMP. --disable-libmudflap Disables the creation of runtime libaries used by libmudflap. --disable-libssp Disables the use of Stack Smashing Protection for runtime libraries. --disable-threads This will prevent GCC from looking for the multi-thread include files, since they haven't been created for this architecture yet. GCC will be able to find the multi-thread information after the Glibc headers are created. --enable-languages=c This option ensures that only the C compiler is built. Continue with compiling the package: make all-gcc all-target-libgcc Install the package: make install-gcc install-target-libgcc