theraven added a comment.
It is problematic for the compiler to differentiate between being invoked as CC
and as cc (clang and gcc both have to work on case-insensitive filesystems).
The convention to have CC as an alias for c++ comes from some SysV platforms
(though not from Linux, which does not install the CC alias). On OS X, cc and
CC are the same file, as the filesystem is case preserving but not case
sensitive.
As a result of this, we have been carrying around patches to clang to make it
detect that it is being invoked as CC for a while, to avoid breaking every
single cmake-built C++ program (a few hundred ports) that defaults to CC as the
C++ compiler (for Solaris/IRIX compatibility), but will happily fall back to
using c++ instead.
Aside from the cost of maintaining this patch, this also adds a place where the
obj dir / install sysroot must be on a case-sensitive filesystem, which harms
attempts to make FreeBSD cross-buildable from OS X / Windows (we are careful to
avoid this requirement for the src tree and have an svn hook to prevent it).
The CC alias does not work on Linux or OS X, so the likelihood of this breaking
third-party code is minimal and the pain that it has already caused is
nontrivial.
REPOSITORY
rS FreeBSD src repository
REVISION DETAIL
https://reviews.freebsd.org/D1932
EMAIL PREFERENCES
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To: dim, emaste, theraven, imp
Cc: kib, imp, freebsd-toolchain
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