ARM: Makefile/gyp update allowing better control of ARM specific options.

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 101 matching lines @@
     storage_[1] = reinterpret_cast<AtomicWord>(argv);
   }
 public:
   // Contains argc and argv. Unfortunately we have to store these two fields
   // into a single one to avoid making the initialization macro (which would be
   // "{ 0, NULL }") contain a coma.
   AtomicWord storage_[2];
 };
 #endif
 
+#if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST)
+# define ENABLE_VFP3_DEFAULT true
+#else
+# define ENABLE_VFP3_DEFAULT false
+#endif
+#if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST)
+# define ENABLE_ARMV7_DEFAULT true
+#else
+# define ENABLE_ARMV7_DEFAULT false
+#endif
+#if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST)
+# define ENABLE_32DREGS_DEFAULT true
+#else
+# define ENABLE_32DREGS_DEFAULT false
+#endif
+
 #define DEFINE_bool(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt)
 #define DEFINE_int(nam, def, cmt) FLAG(INT, int, nam, def, cmt)
 #define DEFINE_float(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt)
 #define DEFINE_string(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt)
 #define DEFINE_args(nam, def, cmt) FLAG(ARGS, JSArguments, nam, def, cmt)
 
 //
 // Flags in all modes.
 //
 #define FLAG FLAG_FULL
@@ skipping 169 matching lines @@
 DEFINE_bool(enable_sse3, true,
             "enable use of SSE3 instructions if available")
 DEFINE_bool(enable_sse4_1, true,
             "enable use of SSE4.1 instructions if available")
 DEFINE_bool(enable_cmov, true,
             "enable use of CMOV instruction if available")
 DEFINE_bool(enable_rdtsc, true,
             "enable use of RDTSC instruction if available")
 DEFINE_bool(enable_sahf, true,
             "enable use of SAHF instruction if available (X64 only)")
-DEFINE_bool(enable_vfp3, true,
+DEFINE_bool(enable_vfp3, ENABLE_VFP3_DEFAULT,
             "enable use of VFP3 instructions if available")
-DEFINE_bool(enable_armv7, true,
+DEFINE_bool(enable_armv7, ENABLE_ARMV7_DEFAULT,
             "enable use of ARMv7 instructions if available (ARM only)")
 DEFINE_bool(enable_sudiv, true,
             "enable use of SDIV and UDIV instructions if available (ARM only)")
 DEFINE_bool(enable_movw_movt, false,
             "enable loading 32-bit constant by means of movw/movt "
             "instruction pairs (ARM only)")
 DEFINE_bool(enable_unaligned_accesses, true,
             "enable unaligned accesses for ARMv7 (ARM only)")
-DEFINE_bool(enable_32dregs, true,
+DEFINE_bool(enable_32dregs, ENABLE_32DREGS_DEFAULT,
             "enable use of d16-d31 registers on ARM - this requires VFP3")
 DEFINE_bool(enable_vldr_imm, false,
             "enable use of constant pools for double immediate (ARM only)")
 
 // bootstrapper.cc
 DEFINE_string(expose_natives_as, NULL, "expose natives in global object")
 DEFINE_string(expose_debug_as, NULL, "expose debug in global object")
 DEFINE_bool(expose_gc, false, "expose gc extension")
 DEFINE_bool(expose_externalize_string, false,
             "expose externalize string extension")
@@ skipping 421 matching lines @@
 #undef DEFINE_bool
 #undef DEFINE_int
 #undef DEFINE_string
 #undef DEFINE_implication
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS