Bug 590416

Summary:	Cross compile from x86_64 to x86 builds 64 bit utilities instead of 32 bit
Product:	[Fedora] Fedora	Reporter:	Matthew Whitehead <mwhitehe>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	low
Version:	11	CC:	anton, dougsland, esandeen, gansalmon, itamar, jonathan, kernel-maint, wcohen
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-06-28 15:44:20 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Matthew Whitehead 2010-05-09 13:05:49 UTC

Description of problem: A 'rpmbuild --target i586' builds a few utilities in kernel-devel that are 64 bit and not 32 bit. This causes utilities such as systemtap to fail.


Version-Release number of selected component (if applicable): kernel-2.6.30.10-105.2.23.fc11


How reproducible: 100%


Steps to Reproduce:
1. rpmbuild --target i586 -bb kernel.spec # done on x86_64 host
2.
3.
  
Actual results: The following files are compiled as 64bit:

/usr/src/kernels/2.6.30.10-105.2.23.fc11.i586/scripts/basic/fixdep
/usr/src/kernels/2.6.30.10-105.2.23.fc11.i586/scripts/basic/hash
/usr/src/kernels/2.6.30.10-105.2.23.fc11.i586/scripts/mod/modpost

Expected results:


Additional info:

Comment 1 Eric Sandeen 2010-05-11 15:56:49 UTC

scripts/mod/Makefile: 

hostprogs-y     := modpost mk_elfconfig


scripts/basic/Makefile:

hostprogs-y     := fixdep docproc hash


"=== 4 Host Program support

Kbuild supports building executables on the host for use during the
compilation stage.
Two steps are required in order to use a host executable.

The first step is to tell kbuild that a host program exists. This is
done utilising the variable hostprogs-y."

IOW these are explicitly built for the host, not the target, in the upstream makefiles.

Why does systemtap care about things like fixdep and modpost?

Comment 2 William Cohen 2010-05-12 16:46:47 UTC

systemtap builds a kernel module for the instrumentation. One can see the "make -C ..." when using the "stap -vv ..." The fixdep and modpost are called during the build of the systemtap instrumentation kernel module.

It might be wiser to use mock to build the kernel in a chroot environment to ensure that everything is really 32-bit.

http://fedoraproject.org/wiki/Projects/Mock

Comment 3 Eric Sandeen 2010-05-12 16:53:00 UTC

Ok, so I guess there are different requirements for these tools; when building for a package, we want the build host to do the processing of the things that will be packaged.  However, if we are actually packaging those tools themselves, we want them to be built for the target.  Hrm.  Probably not an easy one to fix... using Mock sounds good :)

Comment 4 Bug Zapper 2010-06-28 15:44:20 UTC

Fedora 11 changed to end-of-life (EOL) status on 2010-06-25. Fedora 11 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.