[LLVMdev] Building 64-bit libraries on OS X

[Jan Rehders]

Hi,

how do I compile LLVM for 64-bit on OS X? I want to get 64-bit  
libraries which generate x86_64 to link them into a 64-bit  
application. All my attempts ended up with either 32-bit libraries or  
errors. My machine is an Intel Xeon quad core, 'sysctl  
hw.cpu64bit_capable' returns 1 so I think the machine is fine.

- './configure && make' yields 32-bit libraries and executables
- I've tried various variations of ./configure --host X and ./ 
configure --target X. I am not sure which target triple to use (the  
getting started guide says "The values of these options must be legal  
target triples that your GCC compiler supports."). Unfortunately I  
couldn't figure out which target triples to use. I've tried a few but  
until now I either get an error when calling configure or I simply end  
up with 32-bit libraries. For instance "i686_x86-apple-darwin9.0.0"  
results in "Invalid configuration `i686_x86-apple-darwin9.0.0':  
machine `i686_x86-apple' not recognized". "x86_64-apple-darwin9.0.0"  
configures and builds fine but all libraries are 32-bit ("file  
libLTO.dylib" says "libLTO.dylib: Mach-O dynamically linked shared  
library i386").

So, how can I build a 64-bit version for OS X? (Unfortunately prebuild  
executables are not an option for me)

Jan