[LLVMdev] linux mixed 32/64 systems
nicholas at mxc.ca
Wed Mar 11 22:35:23 CDT 2009
Nathan Keynes wrote:
> On 10/03/2009, at 1:25 PM, Nick Lewycky wrote:
>> Currently the build systems sets ARCH based on the result of 'uname -
>> On a mixed 32/64 system (one with a 64-bit kernel and a 32-bit
>> userspace) this will result in "x86_64" which is wrong.
>> We'd like the ARCH variable to represent the userspace we're compiling
>> in/for, not what the kernel happens to be.
>> Does anyone know of a clean way to detect this sort of system
> Cleanest way is probably to explicitly test if __x86_64__ is defined, ie
> [[#ifndef __x86_64__
> error: Not x86-64 even if uname says so!
Fantastic, thank you! This is exactly the sort of thing I was looking for!
I've applied this, basically verbatim, to LLVM's configure system in r66765.
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