Factor out the code to find gcc, and add a command-line option to override the default executable name. This should help cross-compilation by allowing a cross-gcc to be specified from the configuration file instead of only through the CC environment variable.

#ifndef __LDC_GEN_ABI_X86_64_H__
#define __LDC_GEN_ABI_X86_64_H__

#include "gen/abi.h"


TargetABI* getX86_64TargetABI();


#endif