Retire CLANG_IS_CC option

A small reduction in build infrastructure complexity; when we had both
Clang and GCC in the tree it was useful to have both built, and choose
one or the other to install as /usr/bin/cc.  Now only Clang is in the
tree, and there is no point in building and installing base Clang but
not providing it as cc (and c++, cpp).

Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D37075

Makefile.inc1

@@ -759,7 +759,6 @@ TMAKE=		\
 # TOOLS_PREFIX set in BMAKE
 XMAKE=		${BMAKE} \
 		TARGET=${TARGET} TARGET_ARCH=${TARGET_ARCH} \
-		MK_CLANG_IS_CC=${MK_CLANG_BOOTSTRAP} \
 		MK_LLDB=no \
 		MK_LLVM_BINUTILS=no \
 		MK_TESTS=no

UPDATING

@@ -27,6 +27,10 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 14.x IS SLOW:
 	world, or to merely disable the most expensive debugging functionality
 	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20221121:
+	The WITHOUT_CLANG_IS_CC option has been removed.  When Clang is enabled
+	it is always installed as /usr/bin/cc (and c++, cpp).
+
 20221026:
 	Some programs have been moved into separate packages. It is recommended
 	for pkgbase users to do:

share/man/man5/src.conf.5

@@ -1,6 +1,6 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd November 18, 2022
+.Dd November 21, 2022
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -386,12 +386,6 @@ Build clang-format.
 .It Va WITHOUT_CLANG_FULL
 Avoid building the ARCMigrate, Rewriter and StaticAnalyzer components of
 the Clang C/C++ compiler.
-.It Va WITHOUT_CLANG_IS_CC
-Do not install links to the Clang C/C++ compiler as
-.Pa /usr/bin/cc ,
-.Pa /usr/bin/c++
-and
-.Pa /usr/bin/cpp .
 .It Va WITHOUT_CLEAN
 Do not clean before building world and/or kernel.
 .It Va WITHOUT_CPP

share/mk/src.opts.mk

@@ -81,7 +81,6 @@ __DEFAULT_YES_OPTIONS = \
     CDDL \
     CLANG \
     CLANG_BOOTSTRAP \
-    CLANG_IS_CC \
     CLEAN \
     CPP \
     CROSS_COMPILER \

tools/build/options/WITHOUT_CLANG_IS_CC

@@ -1,6 +0,0 @@
-.\" $FreeBSD$
-Do not install links to the Clang C/C++ compiler as
-.Pa /usr/bin/cc ,
-.Pa /usr/bin/c++
-and
-.Pa /usr/bin/cpp .

tools/build/options/WITH_CLANG_IS_CC

@@ -1,6 +0,0 @@
-.\" $FreeBSD$
-Install links to the Clang C/C++ compiler as
-.Pa /usr/bin/cc ,
-.Pa /usr/bin/c++
-and
-.Pa /usr/bin/cpp .

usr.bin/clang/clang/Makefile

@@ -19,7 +19,7 @@ LINKS=	${BINDIR}/clang ${BINDIR}/clang++ \
 	${BINDIR}/clang ${BINDIR}/clang-cpp
 MLINKS=	clang.1 clang++.1 \
 	clang.1 clang-cpp.1
-.if ${MK_CLANG_IS_CC} != "no"
+
 SCRIPTS=CC.sh
 SCRIPTSNAME=CC
 
@@ -30,7 +30,6 @@ MLINKS+= clang.1 cc.1 \
 	clang.1 c++.1 \
 	clang.1 CC.1 \
 	clang.1 cpp.1
-.endif
 
 LIBADD+=	z