Clang as default compiler November 4th
brooks at freebsd.org
Mon Sep 10 21:12:18 UTC 2012
[Please confine your replies to toolchain at freebsd.org to keep the thread
on the most relevant list.]
For the past several years we've been working towards migrating from
GCC to Clang/LLVM as our default compiler. We intend to ship FreeBSD
10.0 with Clang as the default compiler on i386 and amd64 platforms. To
this end, we will make WITH_CLANG_IS_CC the default on i386 and amd64
platforms on November 4th.
What does the mean to you?
* When you build world after the default is changed /usr/bin/cc, cpp, and
c++ will be links to clang.
* This means the initial phase of buildworld and "old style" kernel
compilation will use clang instead of gcc. This is known to work.
* It also means that ports will build with clang by default. A major
of ports work, but a significant number are broken or blocked by
broken ports. For more information see:
What issues remain?
* The gcc->clang transition currently requires setting CC, CXX, and CPP
in addition to WITH_CLANG_IS_CC. I will post a patch to toolchain@
to address this shortly.
* Ports compiler selection infrastructure is still under development.
* Some ports could build with clang with appropriate tweaks.
What can you do to help?
* Switch (some of) your systems. Early adoption can help us find bugs.
* Fix ports to build with clang. If you don't have a clang system, you
can use the CLANG/amd64 or CLANG/i386 build environments on
tl;dr: Clang will become the default compiler for x86 architectures on 2012-11-04
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