On x86_64, LFS does not yet support a multilib configuration. These features will fail to compile when building a cross-compiler and are not necessary for the task of cross-compiling the temporary libc. These switches disable support for the decimal floating point extension, threading, libatomic, libgomp (Gnu OpenMP), libmpx, libquadmath, libssp (Stack Smashing Protector ), libvtv, and the C++ standard library respectively. -disable-decimal-float, -disable-threads, -disable-libatomic, -disable-libgomp, -disable-libmpx, -disable-libquadmath, -disable-libssp, -disable-libvtv, -disable-libstdcxx.We do this to avoid possible issues with the host system. This switch forces GCC to link its internal libraries statically. In the second pass of GCC, this same switch will ensure that no headers from the host system are found. This switch ensures that gcc will find them correctly. However the headers that will be installed in the next two sections will go to $LFS/tools/include. In conjunction with the sysroot switch, this would normally translate to $LFS/usr/include. -with-native-system-header-dir=/tools/includeīy default GCC searches /usr/include for system headers.Setting this to /tools helps keep the host location of /usr/local out of this GCC's search path. The local prefix is the location in the system that GCC will search for locally installed include files. This switch prevents GCC from looking for them. For our purposes these headers will not be needed. When creating a complete cross-compiler, GCC requires standard headers compatible with the target system. This prevents the compiling of any code that requires libc support. Since a working C library is not yet available, this ensures that the inhibit_libc constant is defined when building libgcc. with-sysroot=/opt/crosstools/arm-linux-gnueabihf/SYSROOT with-native-system-header-dir=/opt/crosstools/arm-linux-gnueabihf/include \ with-local-prefix=/opt/crosstools/arm-linux-gnueabihf \ prefix=/opt/crosstools/arm-linux-gnueabihf \
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