On Thu, 10 Jul 2008 20:23:54 +0200 Ralf Wildenhues <Ralf.Wildenhues@xxxxxx> wrote: >* mpsuzuki@xxxxxxxxxxxxxxxxx wrote on Wed, Jul 09, 2008 at 09:24:46AM CEST: >> On Tue, 8 Jul 2008 22:57:24 +0200 Ralf Wildenhues wrote: >> > >> >If you have a way to actually execute code on the compile >> >system (get binfmt to execute 'elksemu $binary' should be >> >possible), then you can avoid compile-only tests and make >> >AC_COMPUTE_INT use the cheaper execution test. > However, you can tell your system admin >to enable binfmt_misc support for 8086 binaries. On my system >it works like this (as root): > > modprobe binfmt_misc > echo ':i86-elks:M::\x01\x03\x20\x00:\xff\xff\xff\x83:/lib/elksemu:' \ > > /proc/sys/fs/binfmt_misc/register > >and causes the kernel to just start elksemu when an 8086 >binary is exec'ed. That means to you, and to configure scripts, >it looks like those binaries can be executed natively, thus >the cross-compile sections of the configure script won't be used, >thus the AC_COMPILE_INT computations will be correct for this case. > >Hope that helps. Again, thank you very much. In my case, on Debian GNU/Linux, the setup to execute ELKS binary via binfmt_misc was following: modprobe binfmt_misc mount -t binfmt_misc none /proc/sys/fs/binfmt_misc echo ':i86-elks:M::\x01\x03\x20\x00:\xff\xff\xff\x83:/usr/bin/elksemu:'\ > /proc/sys/fs/binfmt_misc/register After this registration, I could execute ELKS binary as if on native environment. AC_CHECK_SIZEOF() worked correctly for int and long, they are detected as 16-bit and 32-bit. That's what I wanted to do! >FWIW, I've started working on a patch against Autoconf to support >bcc better, but it will be a bit before it's finished, because >essentially, this compiler is *really* unpredictable when compared >to, say, GCC. bcc definitely needs some work, too. Fully I agree. After the successful execution of configure script, I found many cpp techniques in FreeType2 didn't work correctly in bcc's cpp. Oops. Although my interest was not ELKS + bcc itself, I will have to search the current maintainer of bcc. Regards, mpsuzuki _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
