Add recipe to build for Asus Flip Chromebook

This build includes the GPU-specific code (EGL, GLES)

The armhf_sysroot should be generic enough to support
other ARM targets, like the Raspberry Pi.

I split out the EGL dependencies into their own CIPD package
(chromebook_c100p_lib) to facilitate the modularity of the approach.

When we add another ARM chromebook, maybe one that has different libraries,
we should be able to re-use armhf_sysroot and then a newly created CIPD asset for
that specific GPU (if needed).

Maybe this also can be used to build for the chromecasts (thus the TODO)

Bug: skia:
NOTRY=true

Change-Id: Icc131025932dc8d41da5be39f3c5cad0aa95d848
Reviewed-on: https://skia-review.googlesource.com/11064
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/infra/bots/recipe_modules/flavor/gn_chromebook_flavor.py b/infra/bots/recipe_modules/flavor/gn_chromebook_flavor.py
new file mode 100644
index 0000000000..70b138d239
--- /dev/null
+++ b/infra/bots/recipe_modules/flavor/gn_chromebook_flavor.py
@@ -0,0 +1,96 @@
+# 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.
+
+from recipe_engine import recipe_api
+
+import gn_flavor
+import subprocess
+
+
+"""
+  GN Chromebook flavor utils, used for building and testing Skia for ARM
+  Chromebooks with GN
+"""
+class GNChromebookFlavorUtils(gn_flavor.GNFlavorUtils):
+
+  def compile(self, unused_target):
+    configuration = self.m.vars.builder_cfg.get('configuration')
+    os            = self.m.vars.builder_cfg.get('os')
+    target_arch   = self.m.vars.builder_cfg.get('target_arch')
+    extra_config  = self.m.vars.builder_cfg.get('extra_config', '')
+
+    clang_linux = self.m.vars.slave_dir.join('clang_linux')
+    # This is a pretty typical arm-linux-gnueabihf sysroot
+    sysroot_dir = self.m.vars.slave_dir.join('armhf_sysroot')
+    # This is the extra things needed to link against for the chromebook.
+    #  For example, the Mali GL drivers.
+    if extra_config == 'Chromebook_C100p':
+      gl_dir   = self.m.vars.slave_dir.join('chromebook_c100p_lib')
+
+    extra_asmflags = [
+      '--target=armv7a-linux-gnueabihf',
+      '--sysroot=%s' % sysroot_dir,
+      '-march=armv7-a',
+      '-mfpu=neon',
+      '-mthumb',
+    ]
+
+    extra_cflags = [
+      '--target=armv7a-linux-gnueabihf',
+      '--sysroot=%s' % sysroot_dir,
+      '-I%s' % gl_dir.join('include'),
+      '-I%s' % sysroot_dir.join('include'),
+      '-I%s' % sysroot_dir.join('include', 'c++', '4.8.4'),
+      '-I%s' % sysroot_dir.join('include', 'c++', '4.8.4',
+                                'arm-linux-gnueabihf'),
+       '-DMESA_EGL_NO_X11_HEADERS',
+    ]
+
+    extra_ldflags = [
+      '--target=armv7a-linux-gnueabihf',
+      '--sysroot=%s' % sysroot_dir,
+      # use sysroot's ld which can properly link things.
+      '-B%s' % sysroot_dir.join('bin'),
+      # helps locate crt*.o
+      '-B%s' % sysroot_dir.join('gcc-cross'),
+      # helps locate libgcc*.so
+      '-L%s' % sysroot_dir.join('gcc-cross'),
+      '-L%s' % sysroot_dir.join('lib'),
+      '-L%s' % gl_dir.join('lib'),
+      # Explicitly do not use lld for cross compiling like this - I observed
+      # failures like "Unrecognized reloc 41" and couldn't find out why.
+    ]
+
+    quote = lambda x: '"%s"' % x
+    args = {
+      'cc': quote(clang_linux.join('bin','clang')),
+      'cxx': quote(clang_linux.join('bin','clang++')),
+      'target_cpu': quote(target_arch),
+      'skia_use_fontconfig': 'false',
+      'skia_use_system_freetype2': 'false',
+      'skia_use_egl': 'true',
+    }
+
+    if configuration != 'Debug':
+      args['is_debug'] = 'false'
+    args['extra_asmflags'] = repr(extra_asmflags).replace("'", '"')
+    args['extra_cflags'] = repr(extra_cflags).replace("'", '"')
+    args['extra_ldflags'] = repr(extra_ldflags).replace("'", '"')
+
+    gn_args = ' '.join('%s=%s' % (k,v) for (k,v) in sorted(args.iteritems()))
+
+    gn    = 'gn.exe'    if 'Win' in os else 'gn'
+    ninja = 'ninja.exe' if 'Win' in os else 'ninja'
+    gn = self.m.vars.skia_dir.join('bin', gn)
+
+    context = {
+      'cwd': self.m.vars.skia_dir,
+      'env': {
+          'LD_LIBRARY_PATH': sysroot_dir.join('lib'),
+      }
+    }
+    with self.m.step.context(context):
+      self._py('fetch-gn', self.m.vars.skia_dir.join('bin', 'fetch-gn'))
+      self._run('gn gen', [gn, 'gen', self.out_dir, '--args=' + gn_args])
+      self._run('ninja', [ninja, '-C', self.out_dir, 'nanobench', 'dm'])