Use the ARM assembly code in mpi_arm.c for iOS.

nss/nss.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       ['OS=="ios"', {
         'exclude_nss_root_certs%': 0,
         'exclude_nss_libpkix%': 0,
@@ skipping 556 matching lines @@
         'mozilla/security/nss/lib/freebl/jpake.c',
         'mozilla/security/nss/lib/freebl/md2.c',
         'mozilla/security/nss/lib/freebl/md5.c',
         'mozilla/security/nss/lib/freebl/mpi/logtab.h',
         'mozilla/security/nss/lib/freebl/mpi/mpcpucache.c',
         'mozilla/security/nss/lib/freebl/mpi/mpi-config.h',
         'mozilla/security/nss/lib/freebl/mpi/mpi-priv.h',
         'mozilla/security/nss/lib/freebl/mpi/mpi.c',
         'mozilla/security/nss/lib/freebl/mpi/mpi.h',
         'mozilla/security/nss/lib/freebl/mpi/mpi_amd64.c',
+        'mozilla/security/nss/lib/freebl/mpi/mpi_arm.c',
         'mozilla/security/nss/lib/freebl/mpi/mpi_x86_asm.c',
         'mozilla/security/nss/lib/freebl/mpi/mplogic.c',
         'mozilla/security/nss/lib/freebl/mpi/mplogic.h',
         'mozilla/security/nss/lib/freebl/mpi/mpmontg.c',
         'mozilla/security/nss/lib/freebl/mpi/mpprime.c',
         'mozilla/security/nss/lib/freebl/mpi/mpprime.h',
         'mozilla/security/nss/lib/freebl/mpi/mp_gf2m-priv.h',
         'mozilla/security/nss/lib/freebl/mpi/mp_gf2m.c',
         'mozilla/security/nss/lib/freebl/mpi/mp_gf2m.h',
         'mozilla/security/nss/lib/freebl/mpi/primes.c',
@@ skipping 454 matching lines @@
             'mozilla/security/nss/lib/certhigh/certvfypkixprint.c',
           ],
           'include_dirs/': [
             ['exclude', '^mozilla/security/nss/lib/libpkix/'],
           ],
         }],
         ['target_arch=="ia32"', {
           'sources/': [
             ['exclude', 'amd64'],
           ],
+          'sources!': [
+            'mozilla/security/nss/lib/freebl/mpi/mpi_arm.c',

[Ryan Sleevi, 2012/07/30 06:47:55]

nit: It would seem that either line 1050 should be moved to an explicit
sources!, or the sources! should exclude _arm files, since there is only one
platform-specific file for each (mpi_arm.c/mpi_amd64.c)

+          ],
         }],
         ['OS=="mac" or OS=="ios"', {
           'defines': [
             'XP_UNIX',
             'DARWIN',
             'HAVE_STRERROR',
             'HAVE_BSD_FLOCK',
             'SHLIB_SUFFIX=\"dylib\"',
             'SHLIB_PREFIX=\"lib\"',
             'SOFTOKEN_LIB_NAME=\"libsoftokn3.dylib\"',
@@ skipping 14 matching lines @@
               'NSS_X86_OR_X64',
               'NSS_X86',
               'i386',
             ],
             'GCC_PREPROCESSOR_DEFINITIONS[arch=x86_64]': [
               '$(inherited)',
               'NSS_USE_64',
               'NSS_X86_OR_X64',
               'NSS_X64',
             ],
+            'GCC_PREPROCESSOR_DEFINITIONS[arch=armv7]': [

[wtc, 2012/07/27 23:31:59]

Is this the right way to test for a build that targets
an iOS device (as opposed to the Simulator)?

+              '$(inherited)',
+              'MP_ASSEMBLY_MULTIPLY',
+              'MP_ASSEMBLY_SQUARE',
+              'MP_USE_UINT_DIGIT',
+              'SHA_NO_LONG_LONG',
+            ],
           },
         }],
         ['OS=="win"', {
           'defines': [
             'SHLIB_SUFFIX=\"dll\"',
             'SHLIB_PREFIX=\"\"',
             'SOFTOKEN_LIB_NAME=\"softokn3.dll\"',
             'XP_PC',
             'WIN32',
             'WIN95',
@@ skipping 39 matching lines @@
             '-Wno-incompatible-pointer-types',
             '-Wno-logical-op-parentheses',
             '-Wno-switch',
             '-Wno-tautological-compare',
           ],
         }],
       ],
     },
   ],
 }