[Cronet] Build static libcronet.a for iOS with complete dependencies.

components/cronet/tools/package_ios.py

 #!/usr/bin/python
 # Copyright 2016 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.
 
 """
 package_ios.py - Build and Package Release and Rebug fat libraries for iOS.
 """
 
 import argparse
@@ skipping 72 matching lines @@
                                framework_name, 'Headers'),
                   os.path.join(out_dir, 'Headers'))
 
 
 def package_ios_framework_using_gn(out_dir='out/Framework', extra_options=''):
   print 'Building Cronet Dynamic Framework using gn...'
 
   # Package all builds in the output directory
   os.makedirs(out_dir)
   build_dir = ''
-  for (build_config, gn_extra_args) in [('Debug', 'is_debug=true'),
-        ('Release', 'is_debug=false enable_stripping=true')]:
-    for (target_device, target_cpu, additional_cpu) in [('os', 'arm', 'arm64'),
-        ('simulator', 'x86', 'x64')]:
-      target_dir = '%s-iphone%s' % (build_config, target_device)
-      build_dir = os.path.join("out", target_dir)
-      gn_args = 'target_os="ios" enable_websockets=false ' \
-                'is_cronet_build=true is_component_build=false ' \
-                'disable_file_support=true disable_ftp_support=true ' \
-                'use_platform_icu_alternatives=true ' \
-                'disable_brotli_filter=true enable_dsyms=true ' \
-                'target_cpu="%s" additional_target_cpus = ["%s"] %s' % \

[mef, 2017/04/11 21:05:09]

Using |additional_target_cpus| fails for hide_symbols script. 
Official Cronet builders currently use |additional_target_cpus| to build fat
framework. 
Any ideas on how to fix this without creating a new set of builders? 

[Hiroshi Ichikawa, 2017/04/12 04:35:25]

So far I build the library in multiple architectures and hit lipo command
manually to build a fat binary.

You may do the same in this script, or write a new GN rule to do something
similar to ios_framework_bundle rule does:
https://cs.chromium.org/chromium/src/build/config/ios/rules.gni?l=990&rcl=b6d...

[mef, 2017/04/12 15:57:50]

Thanks for the pointer! I'll give it a try if this experiment pans out.

-                (target_cpu, additional_cpu, gn_extra_args)
+  for (build_config, gn_extra_args) in [('Release', 'is_debug=false enable_stripping=true'),
+       ('Debug', 'is_debug=true'),]:
+    for (target_device, target_cpus) in [('os', ['arm', 'arm64']),
+        ('simulator', ['x64'])]:
+      for target_cpu in target_cpus:
+        target_dir = '%s-iphone%s-%s' % (build_config, target_device, target_cpu)
+        build_dir = os.path.join("out", target_dir)
+        gn_args = 'target_os="ios" enable_websockets=false ' \
+                  'is_cronet_build=true is_component_build=false ' \
+                  'disable_file_support=true disable_ftp_support=true ' \
+                  'use_platform_icu_alternatives=true ' \
+                  'disable_brotli_filter=true enable_dsyms=true ' \
+                  'target_cpu="%s" %s' % \
+                  (target_cpu, gn_extra_args)
 
-      print 'Generating Ninja ' + gn_args
-      gn_result = run('gn gen %s --args=\'%s\'' % (build_dir, gn_args))
-      if gn_result != 0:
-        return gn_result
+        print 'Generating Ninja ' + gn_args
+        gn_result = run('gn gen %s --args=\'%s\'' % (build_dir, gn_args))
+        if gn_result != 0:
+          return gn_result
 
-      print 'Building ' + build_dir
-      build_result = run('ninja -C %s cronet_package' % build_dir,
-                         extra_options)
-      if build_result != 0:
-        return build_result
+        print 'Building ' + build_dir
+        build_result = run('ninja -C %s cronet_package' % build_dir,
+                           extra_options)
+        if build_result != 0:
+          return build_result
 
-      # Copy framework.
-      shutil.copytree(os.path.join(build_dir, 'Cronet.framework'),
-                      os.path.join(out_dir, target_dir, 'Cronet.framework'))
-      # Copy symbols.
-      shutil.copytree(os.path.join(build_dir, 'Cronet.dSYM'),
-          os.path.join(out_dir, target_dir, 'Cronet.framework.dSYM'))
+        # Copy framework.
+        shutil.copytree(os.path.join(build_dir, 'Cronet.framework'),
+                        os.path.join(out_dir, target_dir, 'Cronet.framework'))
+        # Copy symbols.
+        shutil.copytree(os.path.join(build_dir, 'Cronet.dSYM'),
+            os.path.join(out_dir, target_dir, 'Cronet.framework.dSYM'))
+
+        # Copy static library.
+        shutil.copy2(os.path.join(build_dir, 'cronet', 'libcronet.a'),
+            os.path.join(out_dir, target_dir))
 
   # Copy common files from last built package.
   package_dir = os.path.join(build_dir, 'cronet')
   shutil.copy2(os.path.join(package_dir, 'AUTHORS'), out_dir)
   shutil.copy2(os.path.join(package_dir, 'LICENSE'), out_dir)
   shutil.copy2(os.path.join(package_dir, 'VERSION'), out_dir)
   # Copy the headers.
   shutil.copytree(os.path.join(build_dir,
                                'Cronet.framework', 'Headers'),
                   os.path.join(out_dir, 'Headers'))
@@ skipping 56 matching lines @@
 
   if options.gn:
     return package_ios_framework_using_gn(out_dir, extra_options_list)
 
   return package_ios(out_dir, "out/Release", "opt") or \
          package_ios(out_dir, "out/Debug", "dbg")
 
 
 if __name__ == '__main__':
   sys.exit(main())