How to find out the target triple and target data of the host machine via C bindings?

[thielema]

Bugzilla Link	8999
Version	2.8
OS	Linux
Attachments	Create a function and optimize it via C bindings
CC	@asl,@thielema

Extended Description

Please describe how to find out the information needed to let the optimizer work correct and adapted to the host machine when run via the C bindings to LLVM. I'll attach a C program that creates a small function, that shall be run in the JIT. As far as I understand, if I do not tell the target data to PassManager, then I get only generic optimizations. If I set the target data to something invalid (as in the outcommented AddTargetData) the optimizer even performs silently optimizations that are invalid for the host machine. (See http://llvm.org/bugs/show_bug.cgi?id=6394 for details.) Thus: How do I tell the LLVM optimizer to optimize with respect to the host, where I like to run the function in the JIT later?

[thielema]

I looked into llc and found a call to 'getHostTriple' from System/Host.h.
I could not find a C binding to it, though.
Maybe I should change this ticket to a request for a C wrapper to getHostTriple.