Bug 11313

Summary:	As a developer, I want to avoid churn of cross,crosssdk,nativesdk,cross-canadian do_populate_sysroot
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	Ming Liu <liu.ming50>
Component:	core	Assignee:	Ross Burton <ross.burton>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	Medium+	CC:	meta.mr.watcher, meta.watcher
Version:	2.4
Target Milestone:	2.3 M4
Hardware:	x86
OS:	Multiple
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	No (bug/feature does not impact docs)

Description Ming Liu 2017-04-08 17:04:10 UTC

A lot of churn was observed when multiple MACHINEs are sharing a identical build directory, when these MACHINEs are defining different TARGET_* variables (TARGET_CFLAGS, TARGET_CPPFLAGS, TARGET_CXXFLAGS, TARGET_LDFLAGS).

How to reproduce:

1 Create two IMX51 machine conf file.
2 Define different TARGET_* flags in them.
3 Let them share a identical build directory.
4 run bitbake core-image-minimal

You will see the binutils-cross-arm, gcc-cross-arm-* will rebuild every time when you switch the machine and build.

Comment 1 Ming Liu 2017-04-09 04:43:42 UTC

Patch sent to ML: http://lists.openembedded.org/pipermail/openembedded-core/2017-April/135285.html

But it somehow broke the nightly build:
https://autobuilder.yocto.io/builders/nightly-x86-lsb/builds/232/steps/BuildImages/logs/stdio

https://autobuilder.yocto.io/builders/nightly-arm/builds/281/steps/BuildImages/logs/stdio

So only consider merge them after those issues are fixed.

Comment 2 Ross Burton 2017-04-13 16:01:20 UTC

Fixed in oe-core 767335c92b7cc657a008722a908380a3c89c3c66.