On 03/18/2015 11:11 AM, Alex Blekhman wrote: > Andrew Haley writes: >> On 18/03/15 06:37, Alex Blekhman wrote: >>> My goal is to be able to compile both i686 and x86_64 binaries on > the >>> same Debian 6.0 i686 machine. Default compilation target should be > i686, >>> and x86_64 should be available via switch -m64. >> >> That's the usual default. > > Thank you for answering. Are you saying that if I just compile GCC with > all default settings, then it will be capable of > building x86_64 binaries out of the box? I think I have to specify > x86_64 as an additional target somewhere. > >> Do you really want i686-elf? > > I'm not sure which target name to use. I've never built GCC before, so > I'm trying to make sense out of parameters. `uname' > reports that the system is "i686 GNU/Linux", so I thought that "i686- > elf" would be the most generic target I can specify. If you're not cross-compiling you should never set the target. The same for sysroot. GCC has sensible defaults for everything, and unless you know exactly what you're doing overriding them is only likely to break things. > All I want to do is to have 32-bit compiler (and linker, of course), > which is able to produce both 32- and 64-bit binaries. Try this: ../gcc-4.9.2/configure --prefix=/opt/dolby/gcc-4.9 \ --enable-languages=c,c++ --with-system-zlib Come back if that doesn't work. Andrew.
