The imx-gpu-sdk recipe in the meta-imx layer references
${BB_NUMBER_THREADS} in its do_compile function. Changing
BB_NUMBER_THREADS between bitbake invocations leads to the well-known

  When reparsing 
...meta-imx/meta-sdk/recipes-graphics/imx-gpu-sdk/imx-gpu-sdk_5.8.0.bb:do_compile,
 the basehash value changed from 
69be88cf220840ff2203e11cfe65681880b0bf9b88db67d50c1ba772b883bd18 to 
5e6d5029fac8d7856ada4c2eca359568298f82cdb64567d7dd4deda503d9f83a. The metadata 
is not deterministic and this needs to be fixed.

And I'm not the first to hit this problem with that recipe:
https://community.nxp.com/t5/i-MX-Processors/imx-gpu-sdk-compile-error-IMX8MP-IMX8MM-IMX8MQ/td-p/1217864

This happens because BB_NUMBER_THREADS is in BB_HASHCONFIG_IGNORE_VARS,
so changing it does not cause the recipe to be reparsed, but it is not
included in BB_HASHEXCLUDE_COMMON and thus
BB_BASEHASH_IGNORE_VARS. This is inconsistent with and in contrast to
both PARALLEL_MAKE and OMP_NUM_THREADS, the latter of which even has
${BB_NUMBER_THREADS} as default value.

Signed-off-by: Rasmus Villemoes <[email protected]>
---
 meta/conf/bitbake.conf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 6fb7bfeb23c..6bc18016056 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -942,7 +942,7 @@ BB_HASHEXCLUDE_COMMON ?= "TMPDIR FILE PATH PWD BB_TASKHASH 
BBPATH BBSERVER DL_DI
     BB_WORKERCONTEXT BB_LIMITEDDEPS BB_UNIHASH extend_recipe_sysroot 
DEPLOY_DIR \
     SSTATE_HASHEQUIV_METHOD SSTATE_HASHEQUIV_REPORT_TASKDATA \
     SSTATE_HASHEQUIV_OWNER CCACHE_TOP_DIR BB_HASHSERVE GIT_CEILING_DIRECTORIES 
\
-    OMP_NUM_THREADS BB_CURRENTTASK"
+    OMP_NUM_THREADS BB_CURRENTTASK BB_NUMBER_THREADS"
 BB_BASEHASH_IGNORE_VARS ?= "${BB_HASHEXCLUDE_COMMON} PSEUDO_IGNORE_PATHS 
BUILDHISTORY_DIR \
     SSTATE_DIR SOURCE_DATE_EPOCH"
 BB_HASHCONFIG_IGNORE_VARS ?= "${BB_HASHEXCLUDE_COMMON} DATE TIME SSH_AGENT_PID 
\
-- 
2.31.1

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