Hi list, I'm trying to compile gcc 5.2.0 for a ARM Cortex-M4 target (on top of binutils-2.25.1). This is the configure command I use to configure gcc: ../configure --prefix=/home/joe/bin/gcc/arm-cm4-bare/ --without-headers --with-gnu-ld --with-gnu-as --with-dwarf2 --disable-werror --disable-threads --disable-nls --disable-shared --disable-libssp --disable-libmudflap --disable-libgomp --target=arm-none-eabi --with-newlib --with-tune=cortex-m4 --disable-interwork --disable-multilib --with-fpu=fpv4-sp-d16 --with-float=hard --with-mode=thumb --enable-languages=c --with-system-zlib --enable-target-optspace Unfortunately, the build fails: checking for suffix of object files... configure: error: in `/home/joe/work/gcc/gcc/gcc-5.2.0/build/arm-none-eabi/libgcc': configure: error: cannot compute suffix of object files: cannot compile See `config.log' for more details. make[1]: *** [configure-target-libgcc] Error 1 This message is a bit misleading. config.log has the reason: configure:3464: /home/joe/work/gcc/gcc/gcc-5.2.0/build/./gcc/xgcc -B/home/joe/work/gcc/gcc/gcc-5.2.0/build/./gcc/ -B/home/joe/bin/gcc/arm-cm4-bare/arm-none-eabi/bin/ -B/home/joe/bin/gcc/arm-cm4-bare/arm-none-eabi/lib/ -isystem /home/joe/bin/gcc/arm-cm4-bare/arm-none-eabi/include -isystem /home/joe/bin/gcc/arm-cm4-bare/arm-none-eabi/sys-include -o conftest -g -O2 -g -Os conftest.c >&5 conftest.c: In function 'main': conftest.c:12:1: sorry, unimplemented: Thumb-1 hard-float VFP ABI I only care about Cortex-M4, which exclusively uses Thumb-2. How can I completely disable Thumb-1 so I can successfully build gcc? Thanks for the help, Best regards, Johannes
