I think you probably want |--with-native-system-header-dir | |--with-native-system-header-dir=dirname| Specifies thatdirnameis the directory that contains native system header files, rather than/usr/include. This option is most useful if you are creating a compiler that should be isolated from the system as much as possible. It is most commonly used with the--with-sysrootoption and will cause GCC to searchdirnameinside the system root specified by that option. Lance On 9/10/2021 10:54 AM, Anthony de Almeida Lopes via Gcc-help wrote:
I'd like to build gcc for a chroot on my current system. Linux From Scratch uses a method of faking a cross compiler by modifying the vendor field of the target string. For example, changing x86_64-pc-linux-gnu to x86_64-lfs-linux-gnu. I'd like to know if there's a way of avoiding this. While GCC builds fine for my host natively and it builds fine with the LFS method, I have so far been unable to build a host isolated copy any other way. I understand the recommended order is to build binutils and gcc first, then build glibc with them and finally rebuild gcc against that glibc. # I built binutils like this ../configure \ --prefix=$DISTRO/root/bootstrap \ --with-sysroot=$DISTRO \ --disable-nls \ --disable-werror && make -j6 && make -j1 install # Then I tried to build gcc like this ../configure \ --prefix=$DISTRO/tools \ --with-glibc-version=2.11 \ --with-sysroot=$DISTRO \ --with-newlib \ --without-headers \ --enable-initfini-array \ --disable-nls \ --disable-shared \ --disable-multilib \ --disable-decimal-float \ --disable-threads \ --disable-libatomic \ --disable-libgomp \ --disable-libquadmath \ --disable-libssp \ --disable-libvtv \ --disable-libstdcxx \ --enable-languages=c,c++ && make -j6 && make -j1 install But this fails with a bunch of undefined references to the ZSTD namespace such as ZSTD_getErrorName from gcc/lto-compress.c. I assume this means that ./configure has detected that my host system has libzstd but it's trying to look for them in the sysroot, where it obviously can't find them. This happens even if I use --disable-lto. Build System (Arch Linux): linux 5.13.13, glibc 2.33, binutils 2.36.1, gcc 11.1.0 Target System: linux 5.13.12, glibc 2.34, binutils 2.37, gcc 11.2.0 So I'd like to know if I should continue like this, and if so how, or if there is a better (maybe canonical) way of building a host-isolated compiler? - Anthony
