ToolchainRoadmap

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= People = ## page was renamed from UbuntuDownUnder/BOFs/UbuntuDevelopment/ToolChain
##(see the SpecSpec for an explanation)
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 * MatthiasKlose
 * JeffBailey		 = Toolchain Roadmap =
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= Goal = == Status ==

  * Created: [[Date(2005-04-24T00:11:33Z)]] by MattZimmerman[[BR]]
  * Priority: HighPriority[[BR]]
  * People: MatthiasKloseLead, JeffBaileySecond[[BR]]
  * Contributors: MattZimmerman[[BR]]
  * Interested: JimMcQuillan [[BR]]
  * Status: BreezyGoal, UduBof, DistroSpecification, DraftSpec[[BR]]
  * Packages: [[BR]]
  * Depends: [[BR]]
  * UduSessions: 1, 4, 8, etc [[BR]]

== Introduction ==
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= Requirements = == Rationale ==
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 * gcc-4.0 and associated transition
 * Updated glibc		  * Much improved Java support.
 * Better error reporting from C and C++ frontend
 * LSB 3.0 support
 * Fortran 90 support
 * Better optimisations from C compiler
 * Faster compilation at -O0
 * Better standards compliance
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= Agenda = == Scope and Use Cases ==

 * gcc-4.0
 * g++-4.0 and associated ABI transition
 * glibc 2.3.5

== Implementation Plan ==

Already done:

 * Change "gcc" default to 4.0
 * Change "g77" default to 3.4
 * change "cpp" default to 4.0
 * Upload glibc-2.3.5
 * Change powerpc, ia64 to nptl-only

TODO:
 * Details at http://www.ubuntulinux.org/wiki/BreezyToolchainTransition

 * Upload g++-3.4, building g++ on amd64, defaulting to the new C++ ABI (1002).
 * Change "g++" default to 4.0
   - Upload library packages, depending on libstdc++, rename library packages to deal with ABI break, as described on the Transition page.
   - Upload all other packages depending on libstdc++, just recompiling, and/or applying oustanding bug reports including patches.
 * Change "gcj", "gij" default to 4.0
 * Enable ppc64 glibc (ready to upload)
 * Change sparc to nptl-only
 * Add to Breezy release notes intention to drop linuxthreads for remaining arch's.
 * Drop gcc-2.95 (also means dropping chill)
 * Look at tweaking gcc wrapper to look for archaic gcc build options (-O6, etc.)
 * Binutils update (Sparc64 TLS support)
 * Final massive rebuild to make sure that everything is builds correctly.
 * Transition for non-release architectures (libgcc on hppa).

=== Data Preservation and Migration ===

glibc update can cause older applications to fail to run. Failures are usually linker-time failures, so low risk of runtime dataloss.

=== Packages Affected ===

All packages to some degree:

 * Poorly written C applications that don't work with stricter parser
 * Poorly written C++ applications that don't work with stricter parser

=== User Interface Requirements ===

N/A

== Outstanding Issues ==

Coordinating with Debian - confirm that they will follow the same library rename plan.
Proposal sent to debian-release, http://lists.debian.org/debian-release/2005/04/msg00153.html

=== UDU BOF Agenda ===
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 * Transition plans (if transitions are still pending)  * C++ ABI transition plan (if transitions are still pending)
 * libssp and GCC 4.0 ?
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= Pre-Work = === UDU Pre-Work ===

 * Transition plan http://www.ubuntulinux.org/wiki/BreezyToolchainTransition
 * Prepare packages of GCC-4.0 (currently in experimental), glibc (Done, uploaded)
 * PowerPC64 biarch support
 * Import of known FTBFS GCC-4.0 reports from unstable, for universe see http://www.ubuntulinux.org/wiki/UniverseCxxTransition (Done)
 * Determine order of library updates

Toolchain Roadmap

Status

Introduction

Review toolchain status and strategy for Breezy

Rationale

  • Much improved Java support.
  • Better error reporting from C and C++ frontend
  • LSB 3.0 support
  • Fortran 90 support
  • Better optimisations from C compiler
  • Faster compilation at -O0
  • Better standards compliance

Scope and Use Cases

  • gcc-4.0
  • g++-4.0 and associated ABI transition
  • glibc 2.3.5

Implementation Plan

Already done:

  • Change "gcc" default to 4.0
  • Change "g77" default to 3.4
  • change "cpp" default to 4.0
  • Upload glibc-2.3.5
  • Change powerpc, ia64 to nptl-only

TODO:

  • Details at http://www.ubuntulinux.org/wiki/BreezyToolchainTransition

  • Upload g++-3.4, building g++ on amd64, defaulting to the new C++ ABI (1002).
  • Change "g++" default to 4.0
    • - Upload library packages, depending on libstdc++, rename library packages to deal with ABI break, as described on the Transition page. - Upload all other packages depending on libstdc++, just recompiling, and/or applying oustanding bug reports including patches.
  • Change "gcj", "gij" default to 4.0
  • Enable ppc64 glibc (ready to upload)
  • Change sparc to nptl-only
  • Add to Breezy release notes intention to drop linuxthreads for remaining arch's.
  • Drop gcc-2.95 (also means dropping chill)
  • Look at tweaking gcc wrapper to look for archaic gcc build options (-O6, etc.)
  • Binutils update (Sparc64 TLS support)
  • Final massive rebuild to make sure that everything is builds correctly.
  • Transition for non-release architectures (libgcc on hppa).

Data Preservation and Migration

glibc update can cause older applications to fail to run. Failures are usually linker-time failures, so low risk of runtime dataloss.

Packages Affected

All packages to some degree:

  • Poorly written C applications that don't work with stricter parser
  • Poorly written C++ applications that don't work with stricter parser

User Interface Requirements

N/A

Outstanding Issues

Coordinating with Debian - confirm that they will follow the same library rename plan. Proposal sent to debian-release, http://lists.debian.org/debian-release/2005/04/msg00153.html

UDU BOF Agenda

  • Status update (some work will be done prior to UDU)
  • C++ ABI transition plan (if transitions are still pending)
  • libssp and GCC 4.0 ?

UDU Pre-Work

ToolchainRoadmap (last edited 2008-08-06 16:34:44 by localhost)