MIPS: Added support for Loongson architectures.

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index bfa53a7af40f5d9cd2d22036e7580296ec98667f..b57951afd565c44b527c6261ec05515d23943e5b 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']
         },
@@ -545,6 +551,9 @@ SAMPLE_FLAGS = {
       'mips_arch_variant:mips32r2': {
         'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
       },
+      'mips_arch_variant:loongson': {
+        'CPPDEFINES':    ['_MIPS_ARCH_LOONGSON']
+      },
       'simulator:none': {
         'CCFLAGS':      ['-EL'],
         'LINKFLAGS':    ['-EL'],
@@ -554,6 +563,9 @@ 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']
         },
@@ -697,6 +709,9 @@ PREPARSER_FLAGS = {
       'mips_arch_variant:mips32r2': {
         'CPPDEFINES':    ['_MIPS_ARCH_MIPS32R2']
       },
+      'mips_arch_variant:loongson': {
+        'CPPDEFINES':    ['_MIPS_ARCH_LOONGSON']
+      },
       'simulator:none': {
         'CCFLAGS':      ['-EL'],
         'LINKFLAGS':    ['-EL'],
@@ -706,6 +721,9 @@ 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']
         },
@@ -1114,7 +1132,7 @@ 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'
   },