On 21 March 2018 at 15:26, Michael Brunnbauer wrote: > > Hello Jonathan, > > On Wed, Mar 21, 2018 at 03:11:33PM +0000, Jonathan Wakely wrote: >> What do you mean by "hardware name is x86_64"? > > uname -m > >> What does running the config.guess script from the gcc source tree print? > > x86_64-pc-linux-gnu That's definitely the problem. I don't think you mentioned this unusual setup, you said you were building on a "x86 32 bit system". > Hm... that should probably be i686-pc-linux-gnu. "gcc -dumpmachine" for my > old gcc says i686-pc-linux-gnu and that is what I want gcc to produce: > 32 bit code that will run on older CPUs and 64 bit code only when requested. > > Should I pass something like --with-cpu=i686 to configure? That's not a valid cpu for x86_64. Try --host=i686-pc-linux-gnu Maybe also --build=i686-pc-linux-gnu
