On 28/02/2022 14.41, Richard Purdie wrote: > On Mon, 2022-02-28 at 09:42 +0100, Rasmus Villemoes wrote: >> 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. > > Technically imx-gpu-sdk is incorrect. BB_NUMBER_THREADS is the number of tasks > bitbake should run. PARALLEL_MAKE is what is used for parallelism in > do_compile. > > I appreciate that has -j in but you can use: ${@oe.utils.parallel_make(d)} to > obtain the value that recipe needs.
Oh, I'm not saying that that recipe isn't buggy, but is still seems awfully user-unfriendly and inconsistent to treat BB_NUMBER_THREADS different from PARALLEL_MAKE wrt. hash computations. But now I've raised the issue, and I don't care much what happens next; I now know the root cause of the error I saw and rarely build using meta-imx in the first place. Rasmus
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