MIPS: Added support for Loongson architectures.

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index d4eaebef8debd1fd459ddf6bd662e8c46ede37e3..859f6137b7c2ee83885e3888f6c1def81962ad71 100644
--- a/SConstruct
+++ b/SConstruct
@@ -185,6 +185,9 @@ LIBRARY_FLAGS = {
       'mips_arch_variant:mips32r2': {
         'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
       },
+      'mips_arch_variant:loongson': {
+        'CPPDEFINES':    ['_MIPS_ARCH_LOONGSON']
+      },
       'simulator:none': {
         'CCFLAGS':      ['-EL'],
         'LINKFLAGS':    ['-EL'],
@@ -194,6 +197,9 @@ LIBRARY_FLAGS = {
         'mips_arch_variant:mips32r1': {
           'CCFLAGS':      ['-mips32', '-Wa,-mips32']
         },
+        'mips_arch_variant:loongson': {
+          'CCFLAGS':      ['-march=mips3', '-Wa,-march=mips3']
+        },
         'library:static': {
           'LINKFLAGS':    ['-static', '-static-libgcc']
         },
@@ -539,6 +545,9 @@ SAMPLE_FLAGS = {
       'mips_arch_variant:mips32r2': {
         'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
       },
+      'mips_arch_variant:loongson': {
+        'CPPDEFINES':    ['_MIPS_ARCH_LOONGSON']
+      },
       'simulator:none': {
         'CCFLAGS':      ['-EL'],
         'LINKFLAGS':    ['-EL'],
@@ -548,6 +557,9 @@ SAMPLE_FLAGS = {
         'mips_arch_variant:mips32r1': {
           'CCFLAGS':      ['-mips32', '-Wa,-mips32']
         },
+        'mips_arch_variant:loongson': {
+          'CCFLAGS':      ['-march=mips3', '-Wa,-march=mips3']
+        },
         'library:static': {
           'LINKFLAGS':    ['-static', '-static-libgcc']
         },
@@ -691,6 +703,9 @@ PREPARSER_FLAGS = {
       'mips_arch_variant:mips32r2': {
         'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
       },
+      'mips_arch_variant:loongson': {
+        'CPPDEFINES':    ['_MIPS_ARCH_LOONGSON']
+      },
       'simulator:none': {
         'CCFLAGS':      ['-EL'],
         'LINKFLAGS':    ['-EL'],
@@ -700,6 +715,9 @@ PREPARSER_FLAGS = {
         'mips_arch_variant:mips32r1': {
           'CCFLAGS':      ['-mips32', '-Wa,-mips32']
         },
+        'mips_arch_variant:loongson': {
+          'CCFLAGS':      ['-march=mips3', '-Wa,-march=mips3']
+        },
         'library:static': {
           'LINKFLAGS':    ['-static', '-static-libgcc']
         },
@@ -1108,7 +1126,7 @@ SIMPLE_OPTIONS = {
     'help': 'generate calling conventiont according to selected mips ABI'
   },
   'mips_arch_variant': {
-    'values': ['mips32r2', 'mips32r1'],
+    'values': ['mips32r2', 'mips32r1', 'loongson'],
     'default': 'mips32r2',
     'help': 'mips variant'
   },