[PATCH 1/1] improve performance by immediate evaluation of HOST_ARCH

["'Felix Moessbauer' via isar-users" <isar-users@googlegroups.com>]

To determine the host architecture dpkg --print-architecture is
executed. This call is currently a lazy one, hence it is evaluated at
the location where HOST_ARCH is expanded. On multiconfig this led to
almost a million process invocations, slowing down the parsing.

By making this assignment immediate, it is only evaluated once (per
recipe), reducing the parse time by around 50% on some larger
multiconfigs. Prior to the change an extra weak assignemnt was used.
However, the HOST_ARCH is not expected to change anyways, hence the
replacement should be fine.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 meta/classes-global/base.bbclass | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/meta/classes-global/base.bbclass b/meta/classes-global/base.bbclass
index 471442e5..6c788adb 100644
--- a/meta/classes-global/base.bbclass
+++ b/meta/classes-global/base.bbclass
@@ -59,7 +59,8 @@ def get_deb_host_arch():
         ["dpkg", "--print-architecture"]
     ).decode('utf-8').strip()
     return host_arch
-HOST_ARCH ??= "${@get_deb_host_arch()}"
+# immediately evaluate to avoid costly process call
+HOST_ARCH := "${@get_deb_host_arch()}"
 HOST_DISTRO ??= "${DISTRO}"
 
 # Inject the PREFERRED_PROVIDERs for multiarch variants. This corresponds to
-- 
2.51.0

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