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Add note about fagility of the clang upgrade process.

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This commit is contained in:
Warner Losh 2013-04-20 01:12:23 +00:00
parent 6b156f6137
commit 4f1def6889
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=249665
1 changed files with 5 additions and 0 deletions
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5
UPDATING
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@ -11,6 +11,11 @@ handbook:
Items affecting the ports and packages system can be found in
/usr/ports/UPDATING. Please read that file before running portupgrade.
NOTE: FreeBSD has switched from gcc to clang. If you have trouble bootstrapping
from older versions of FreeBSD, try WITHOUT_CLANG and WITHOUT_CLANG_IS_CC to
bootstrap to tip of head, and then rebuild without those options. The bootstrap
process from older version of current is a bit fragile.
NOTE TO PEOPLE WHO THINK THAT FreeBSD 10.x IS SLOW:
FreeBSD 10.x has many debugging features turned on, in both the kernel
and userland. These features attempt to detect incorrect use of