On Mon, Dec 26, 2011 at 3:53 AM, Alex Rønne Petersen <xtzgzo...@gmail.com> wrote: > On 26-12-2011 06:41, Nathan Coe wrote: >> >> Is there a way to change what is compiled in based on whether the -m32 or >> -m64 >> option is chosen? I can see that there are predefined versions (for X86 >> and >> X86_64 e.g.), but I don't know if this is based on the compile options, or >> the >> platform the compilation is being performed on. As an example, if I am >> compiling on a 64-bit intel machine, is the version X86 or X86_64 set by >> default? >> Thanks. > > > Use: > > version (D_LP64) > { > // 64-bit ... > } > else > { > // 32-bit ... > } > > Always avoid using architecture identifiers to figure out bitness. There > were plenty of cases of this in druntime and phobos which made portability > very annoying (they are fixed now, though). >
+1 This makes things like, say, running code on ARM much much simpler. If you don't actually need X86, don't require it.