After years of hard work by many FreeBSD and LLVM developers, make

clang the default compiler on i386 and amd64 systems.

Special thanks to:	dim, ed, rdivacky

UPDATING

@@ -24,6 +24,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 10.x IS SLOW:
	disable the most expensive debugging functionality run
	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)

20121105:
	On i386 and amd64 systems WITH_CLANG_IS_CC is now the default.
	This means that the world and kernel will be compiled with clang
	and that clang will be installed as /usr/bin/cc, /usr/bin/c++,
	and /usr/bin/cpp.  To disable this behavior and revert to building
	with gcc, compiler with WITHOUT_CLANG_IS_CC.

20121102:
	The IPFIREWALL_FORWARD kernel option has been removed. Its
	functionality now turned on by default.

share/mk/bsd.own.mk

@@ -426,7 +426,6 @@ __DEFAULT_NO_OPTIONS = \
    BIND_XML \
    BSDCONFIG \
    CLANG_EXTRAS \
    CLANG_IS_CC \
    CTF \
    HESIOD \
    ICONV \
@@ -455,6 +454,12 @@ __DEFAULT_YES_OPTIONS+=CLANG
.else
__DEFAULT_NO_OPTIONS+=CLANG
.endif
# Clang the default system compiler only on x86.
.if ${__T} == "amd64" || ${__T} == "i386"
__DEFAULT_YES_OPTIONS+=CLANG_IS_CC
.else
__DEFAULT_NO_OPTIONS+=CLANG_IS_CC
.endif
# FDT is needed only for arm, mips and powerpc
.if ${__T:Marm*} || ${__T:Mpowerpc*} || ${__T:Mmips*}
__DEFAULT_YES_OPTIONS+=FDT

sys/sys/param.h

@@ -58,7 +58,7 @@
 *		in the range 5 to 9.
 */
#undef __FreeBSD_version
#define __FreeBSD_version 1000023	/* Master, propagated to newvers */
#define __FreeBSD_version 1000024	/* Master, propagated to newvers */

/*
 * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,