Attempt to let nss's SSSE3 files build with clang-cl.

nss.gyp

Index: nss.gyp
diff --git a/nss.gyp b/nss.gyp
index f1add4f8acfec20fdff5c277aa78f28ee0f8eb9c..bf81eb849ea78c0d092987e9bc1c52c4007b138d 100644
--- a/nss.gyp
+++ b/nss.gyp
@@ -454,6 +454,71 @@
       },
     },
     {
+      # This target contains files compiled for AVX. The code calling the
+      # functions in this target has to check if the current CPU supports AVX.
+      'target_name': 'nss_static_avx',
+      'suppress_wildcard': 1,
+      'conditions': [
+        ['OS!="win" or target_arch!="ia32"', {
+          'type': 'none',
+        }, {
+          'type': 'static_library',
+          'sources': [
+            'nss/lib/freebl/intel-gcm-wrap.c',
+            'nss/lib/freebl/intel-gcm-x86-masm.asm',
+            'nss/lib/freebl/intel-gcm.h',
+          ],
+          'defines': [
+            'INTEL_GCM',
+            'NSS_X86_OR_X64',
+            'NSS_X86',
+            'MP_API_COMPATIBLE',
+            'MP_ASSEMBLY_DIV_2DX1D',
+            'MP_ASSEMBLY_MULTIPLY',
+            'MP_ASSEMBLY_SQUARE',
+            'MP_ASSEMBLY_DIV_2DX1D',
+            'MP_USE_UINT_DIGIT',
+            'MP_NO_MP_WORD',
+            'MP_USE_UINT_DIGIT',
+            'NSS_DISABLE_DBM',
+            'NSS_STATIC',
+            'NSS_USE_STATIC_LIBS',
+            'NSS_X86',
+            'NSS_X86_OR_X64',
+            'RIJNDAEL_INCLUDE_TABLES',
+            'SHLIB_PREFIX=\"\"',
+            'SHLIB_SUFFIX=\"dll\"',
+            'SHLIB_VERSION=\"3\"',
+            'SOFTOKEN_LIB_NAME=\"softokn3.dll\"',
+            'SOFTOKEN_SHLIB_VERSION=\"3\"',
+            'USE_HW_AES',
+            'USE_UTIL_DIRECTLY',
+            'WIN32',
+            'WIN95',
+            'XP_PC',
+            '_WINDOWS',
+            '_X86_',
+          ],
+          'include_dirs': [
+            'nspr/pr/include',
+            'nspr/lib/ds',
+            'nspr/lib/libc/include',
+            'nss/lib/freebl/ecl',
+            'nss/lib/util',
+          ],
+          'msvs_disabled_warnings': [4018],
+          'msvs_settings': {
+            'MASM': {
+              'UseSafeExceptionHandlers': 'true',
+            },
+            'VCCLCompilerTool': {
+              'EnableEnhancedInstructionSet': '3',  # Enable AVX.
+            },
+          },
+        }],
+      ],
+    },
+    {
       'target_name': 'nss_static',
       'type': 'static_library',
       # This target is an implementation detail - the public dependencies
@@ -583,9 +648,6 @@
         'nss/lib/freebl/gcm.h',
         'nss/lib/freebl/intel-aes-x86-masm.asm',
         'nss/lib/freebl/intel-aes.h',
-        'nss/lib/freebl/intel-gcm-wrap.c',
-        'nss/lib/freebl/intel-gcm-x86-masm.asm',
-        'nss/lib/freebl/intel-gcm.h',
         'nss/lib/freebl/hmacct.c',
         'nss/lib/freebl/hmacct.h',
         'nss/lib/freebl/jpake.c',
@@ -982,6 +1044,7 @@
       ],
       'dependencies': [
         'nspr',
+        'nss_static_avx',
         '../sqlite/sqlite.gyp:sqlite',
       ],
       'export_dependent_settings': [
@@ -1202,8 +1265,6 @@
               ],
               'sources!': [
                 'nss/lib/freebl/intel-aes-x86-masm.asm',
-                'nss/lib/freebl/intel-gcm-wrap.c',
-                'nss/lib/freebl/intel-gcm-x86-masm.asm',
                 'nss/lib/freebl/mpi/mpi_amd64.c',
                 'nss/lib/freebl/mpi/mpi_x86_asm.c',
               ],
@@ -1212,8 +1273,6 @@
         }, { # else: OS!="win"
           'sources!': [
             'nss/lib/freebl/intel-aes-x86-masm.asm',
-            'nss/lib/freebl/intel-gcm-wrap.c',
-            'nss/lib/freebl/intel-gcm-x86-masm.asm',
             # mpi_x86_asm.c contains MSVC inline assembly code.
             'nss/lib/freebl/mpi/mpi_x86_asm.c',
           ],