On 13 Nov 2015, at 13:07, Johannes Bauer <dfnsonfsduifb@xxxxxx> wrote: > > 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? My equivalent for 4.9.1 had —with-cpu=cortex-m4 (and not —with-tune=cortex-m4)
