chromium68: custom toolchain, target v8 snapshot

Modify the chromium68 recipe to make it more like the one available in
meta-browser: https://github.com/OSSystems/meta-browser

Instead of passing Yocto's build flags to the cros (=ChromeOS)
toolchain, generate a toolchain definition file specifically for this
build.

For the generation of the V8 memory snapshot, build the required files
for the target architecture, then use qemu-native to run them.
Upstream chromium addresses this problem by downloading a specific
native toolchain for every target platform, which we cannot do in this
context.

The toolchain changes trigger an issue with ARMv7 builds; backported
one patch to address that specific issue.

This changes also triggered a problem with 32 bit targets, the
generated binaries were too big. Forced the DEBUG_ARGS to use -g1 (or
-g0 otherwise).

Bug-AGL: SPEC-2514

Change-Id: Ib18431b628415c58a3c29595bfff10057e355a4b
Signed-off-by: Jacobo Aragunde Pérez <jaragunde@igalia.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/meta-html5-framework/recipes-wam/chromium/chromium68/v8-qemu-wrapper.patch b/meta-html5-framework/recipes-wam/chromium/chromium68/v8-qemu-wrapper.patch
new file mode 100644
index 00000000..485766b0
--- /dev/null
+++ b/meta-html5-framework/recipes-wam/chromium/chromium68/v8-qemu-wrapper.patch
@@ -0,0 +1,40 @@
+Upstream-Status: Inappropriate [embedder specific]
+
+The patch below makes the V8 binaries run during the build be invoked through
+QEMU, as they are built for the target.
+
+Signed-off-by: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
+Signed-off-by: Maksim Sisov <msisov@igalia.com>
+
+Index: git/src/tools/v8_context_snapshot/BUILD.gn
+===================================================================
+--- git.orig/src/tools/v8_context_snapshot/BUILD.gn
++++ git/src/tools/v8_context_snapshot/BUILD.gn
+@@ -62,6 +62,7 @@ if (use_v8_context_snapshot) {
+     output_path = rebase_path(output_file, root_build_dir)
+ 
+     args = [
++      "./v8-qemu-wrapper.sh",
+       "./" + rebase_path(
+               get_label_info(
+                       ":v8_context_snapshot_generator($v8_snapshot_toolchain)",
+Index: git/src/v8/BUILD.gn
+===================================================================
+--- git.orig/src/v8/BUILD.gn
++++ git/src/v8/BUILD.gn
+@@ -900,6 +900,7 @@ action("run_torque") {
+   }
+ 
+   args = [
++    "./v8-qemu-wrapper.sh",
+     "./" + rebase_path(get_label_info(":torque($v8_torque_toolchain)",
+                                       "root_out_dir") + "/torque",
+                        root_build_dir),
+@@ -977,6 +978,7 @@ template("run_mksnapshot") {
+     data = []
+ 
+     args = [
++      "./v8-qemu-wrapper.sh",
+       "./" + rebase_path(get_label_info(":mksnapshot($v8_snapshot_toolchain)",
+                                         "root_out_dir") + "/mksnapshot",
+                          root_build_dir),