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Build Infrastructure/Sysadmin Distro/CrossToolchain Background
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== Pointers on the cross build == | == Pointers on the cross build == | ||
| - | * http://en.opensuse.org/ | + | * http://en.opensuse.org/openSUSE:Build_Service_Concept_CrossDevelopment |
* http://lizards.opensuse.org/2009/01/27/build-maemo-apps-with-opensuse-buildservice-it-works/ | * http://lizards.opensuse.org/2009/01/27/build-maemo-apps-with-opensuse-buildservice-it-works/ | ||
Revision as of 18:57, 18 November 2010
Contents |
Background and pointers
Background
Different types of crossbuilding: http://en.opensuse.org/Build_Service/Concepts/CrossDevelopment#Types_of_Crossbuild
A bit terminology:
- pure native - builds on real hardware
- cross-compilation - as in traditional
- transparent emulation - qemu-arm is used for executing arm binaries on x86
- "native" + emulation - emulated execution without the use of cross-compiler or speedup
- "cross" + emulation - emulated execution with the use of cross-compiler and speedup
For the "native"+emulation cross-build (as in: without cross-compilers), we use qemu-arm. The callenge is now to keep the environment but
add speed through cross-compilers (="cross"+emulation).
Pointers on the cross build
Some figures
With all changes in place, we reach really good speed. E.g. for:
- package rpm
- package glibc w/o locales
Build time in minutes
| x86 native | armv5tel native | armv5tel cross | factor x86->arm native | factor x86->arm cross | ||
| rpm | 8 | 107 | 17 | 13,38 | 2,13 | |
| glibc | 33 | 505 | 63 | 15,3 | 1,91 |
