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. > Are you cross-compiling? Well, strictly speaking it seems like cross-compiling. However, GCC docs call it "bi-arch": <from "Installing GCC: Configuration"> --enable-targets=target_list Some GCC targets, e.g. powerpc64-linux, build bi-arch compilers. These are compilers that are able to generate either 64-bit or 32-bit code. Typically, the corresponding 32-bit target, e.g. powerpc-linux for powerpc64-linux, only generates 32-bit code. This option enables the 32-bit target to be a bi-arch compiler, which is useful when you want a bi-arch compiler that defaults to 32-bit, and you are building a bi-arch or multi-arch binutils in a combined tree. On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64), defaulted to o32. Currently, this option only affects sparc-linux, powerpc-linux, x86- linux, mips-linux and s390-linux. </end> 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. Thanks Alex
