I am working on a project for Raspberry Pi 3 and i'm using buildroot for building linux kernel, fs etc. But every now and then (when i change the settings of buildroot for example) i am no longer able to successfully finish the build proccess even if i roll back to previous configuration (even if i choose initial raspberrypi3_defconfig configuration). The error is always similar:
host-binutils 2.28.1 Configuring (cd /home/andy/embedded_linux/buildroot/output/build/host-binutils-2.28.1/ && rm -rf config.cache; PATH="/home/andy/embedded_linux/buildroot/output/host/bin:/home/andy/embedded_linux/buildroot/output/host/sbin:/home/andy/bin:/home/andy/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" PKG_CONFIG="/home/andy/embedded_linux/buildroot/output/host/bin/pkg-config" PKG_CONFIG_SYSROOT_DIR="/" PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 PKG_CONFIG_LIBDIR="/home/andy/embedded_linux/buildroot/output/host/lib/pkgconfig:/home/andy/embedded_linux/buildroot/output/host/share/pkgconfig" AR="/usr/bin/ar" AS="/usr/bin/as" LD="/usr/bin/ld" NM="/usr/bin/nm" CC="/usr/bin/gcc" GCC="/usr/bin/gcc" CXX="/usr/bin/g++" CPP="/usr/bin/cpp" OBJCOPY="/usr/bin/objcopy" RANLIB="/usr/bin/ranlib" CPPFLAGS="-I/home/andy/embedded_linux/buildroot/output/host/include" CFLAGS="-O2 -I/home/andy/embedded_linux/buildroot/output/host/include" CXXFLAGS="-O2 -I/home/andy/embedded_linux/buildroot/output/host/include" LDFLAGS="-L/home/andy/embedded_linux/buildroot/output/host/lib -Wl,-rpath,/home/andy/embedded_linux/buildroot/output/host/lib" INTLTOOL_PERL=/usr/bin/perl CFLAGS="-O2 -I/home/andy/embedded_linux/buildroot/output/host/include" LDFLAGS="-L/home/andy/embedded_linux/buildroot/output/host/lib -Wl,-rpath,/home/andy/embedded_linux/buildroot/output/host/lib" MAKEINFO=true CONFIG_SITE=/dev/null ./configure --prefix="/home/andy/embedded_linux/buildroot/output/host" --sysconfdir="/home/andy/embedded_linux/buildroot/output/host/etc" --localstatedir="/home/andy/embedded_linux/buildroot/output/host/var" --enable-shared --disable-static --disable-gtk-doc --disable-gtk-doc-html --disable-doc --disable-docs --disable-documentation --disable-debug --with-xmlto=no --with-fop=no --disable-dependency-tracking --disable-multilib --disable-werror --target=-buildroot-linux-uclibcgnueabihf --disable-shared --enable-static --with-sysroot=/home/andy/embedded_linux/buildroot/output/host/-buildroot-linux-uclibcgnueabihf/sysroot --enable-poison-system-directories --disable-sim --disable-gdb ) configure: loading site script /dev/null checking build system type... x86_64-pc-linux-gnu checking host system type... x86_64-pc-linux-gnu checking target system type... configure: error: /bin/bash ./config.sub -buildroot-linux-uclibcgnueabihf failed
The error can occur while configuring some other utility (for example while configuring flex 2.6.4, or dropbear etc) but the main parttern of the error is always the same: checking target system type... configure: error: /bin/bash ./config.sub -buildroot-linux-something failed
Couldn't find out the solution to that problem, please, help me.
I don't exactly get what is going wrong, but as you describe "when i change the settings of buildroot for example", I can tell you that buildroot has no means of supporting this in all cases from a normal make. You should e.g. use a make clean and do a full rebuild.
See https://buildroot.org/downloads/manual/manual.html#full-rebuild for more information.