gecko-dev/media/libvpx/vpx_config.h

#if defined(VPX_X86_ASM)

#if defined(_WIN32) && !defined(__GNUC__) && defined(_M_IX86)
/* 32 bit Windows, MSVC. */
#include "vpx_config_x86-win32-vs8.h"

#elif defined(__APPLE__) && defined(__x86_64__)
/* 64 bit MacOS. */
#include "vpx_config_x86_64-darwin9-gcc.h"

#elif defined(__APPLE__) && defined(__i386__)
/* 32 bit MacOS. */
#include "vpx_config_x86-darwin9-gcc.h"

#elif defined(__linux__) && defined(__i386__)
/* 32 bit Linux. */
#include "vpx_config_x86-linux-gcc.h"

#elif defined(__linux__) && defined(__x86_64__)
/* 64 bit Linux. */
#include "vpx_config_x86_64-linux-gcc.h"

#elif defined(_MSC_VER) && defined(_M_X64)
/* 64 bit Windows */
#include "vpx_config_x86_64-win64-vs8.h"

#else
#error VPX_X86_ASM is defined, but assembly not supported on this platform!
#endif

#else
/* Assume generic GNU/GCC configuration. */
#include "vpx_config_generic-gnu.h"
#endif