distro/include: Add debug_build.inc when DEBUG_BUILD is enabled

In bitbake.conf, use ??= to set *_OPTIMIZATION, add a new include
file debug_build.inc to use ?= to override *_OPTIMIZATION when
DEBUG_BUILD is enabled

When DEBUG_BUILD is enabled:
- Defer inherit bblcass debug_build, while setting DEBUG_BUILD = "1" in
  local.conf, the debug build is enabled globally. For the recipe (such
  as qemu) which doesn't work without optimization, set DEBUG_BUILD = "0"
  to disable it for a given recipe

- Use include_all to allow other layers to add their own debug build
  configurations

Suggested-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
(From OE-Core rev: 36144bdd5e25da9a523c68174d110013968e0fdf)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/meta/classes-recipe/debug_build.bbclass b/meta/classes-recipe/debug_build.bbclass
new file mode 100644
index 0000000000..a917e9cbc9
--- /dev/null
+++ b/meta/classes-recipe/debug_build.bbclass
@@ -0,0 +1,8 @@
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+# Allow other layers to add their own debug build configurations
+include_all conf/distro/include/debug_build.inc