build: define ARCH_STRING in Makefile on Linux and other GNU platforms

GNU platforms (Linux, kFreeBSD, Hurd) have endian.h to determine
endianness, so all architectures except x86_64 are in fact treated
identically, except that their ARCH_STRING is different.
The ARCH_STRING must always be identical to the ARCH from the Makefile,
otherwise the engine will not find its cgame, game and ui plugins
under their expected names and startup will fail. If we pass it in
from the Makefile, then an identical value is guaranteed, and we can
get rid of an increasingly long list of defined(__some_cpu__) tests.

The one remaining quirk is that we test __x86_64__ to determine
whether to define idx64; I've kept that, but separated it from
the ARCH_STRING.

On non-Linux platforms we only support a few architectures anyway,
so keeping the list up to date is less of a burden; *BSD porters
could probably use the same technique to get support for lots of
architectures with little effort, but I have not done that here,
because I cannot test it.

Windows must continue to support preprocessor-based architecture tests
in any case, so that the MSVC solutions (which do not use the Makefile)
can continue to work. However, Windows only runs on a few CPU families,
so this shouldn't be a significant burden in practice.

When cross-compiling, the tools are compiled for the build architecture
(COMPILE_PLATFORM, COMPILE_ARCH) rather than the host architecture
(PLATFORM, ARCH), so define ARCH_STRING to COMPILE_ARCH on a GNU
COMPILE_PLATFORM.

1 files changed, 5 insertions, 30 deletions

diff --git a/src/qcommon/q_platform.h b/src/qcommon/q_platform.h
index f3518bfc..34a93626 100644
--- a/src/qcommon/q_platform.h
+++ b/src/qcommon/q_platform.h
@@ -186,38 +186,13 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #define PATH_SEP '/'
 
-#if defined __i386__
-#define ARCH_STRING "x86"
-#elif defined __x86_64__
+#if !defined(ARCH_STRING)
+# error ARCH_STRING should be defined by the Makefile
+#endif
+
+#if defined __x86_64__
 #undef idx64
 #define idx64 1
-#define ARCH_STRING "x86_64"
-#elif defined __powerpc64__
-#define ARCH_STRING "ppc64"
-#elif defined __powerpc__
-#define ARCH_STRING "ppc"
-#elif defined __s390__
-#define ARCH_STRING "s390"
-#elif defined __s390x__
-#define ARCH_STRING "s390x"
-#elif defined __ia64__
-#define ARCH_STRING "ia64"
-#elif defined __alpha__
-#define ARCH_STRING "alpha"
-#elif defined __sparc__
-#define ARCH_STRING "sparc"
-#elif defined __arm__
-#define ARCH_STRING "arm"
-#elif defined __aarch64__
-#define ARCH_STRING "aarch64"
-#elif defined __cris__
-#define ARCH_STRING "cris"
-#elif defined __hppa__
-#define ARCH_STRING "hppa"
-#elif defined __mips__
-#define ARCH_STRING "mips"
-#elif defined __sh__
-#define ARCH_STRING "sh"
 #endif
 
 #if __FLOAT_WORD_ORDER == __BIG_ENDIAN