# HG changeset patch
# User Taylor R Campbell <riastradh@NetBSD.org>
# Date 1593550486 0
#      Tue Jun 30 20:54:46 2020 +0000
# Branch trunk
# Node ID 569bb898a4486230be6d1bb1e568410c9795be92
# Parent  1b8d2bba14bad98861bff02320279c0cd181062f
# EXP-Topic riastradh-kernelcrypto
New build.sh option: -c <compiler>

diff -r 1b8d2bba14ba -r 569bb898a448 build.sh
--- a/build.sh	Tue Jun 30 20:27:09 2020 +0000
+++ b/build.sh	Tue Jun 30 20:54:46 2020 +0000
@@ -1028,8 +1028,8 @@ usage()
 	cat <<_usage_
 
 Usage: ${progname} [-EhnoPRrUuxy] [-a arch] [-B buildid] [-C cdextras]
-                [-D dest] [-j njob] [-M obj] [-m mach] [-N noisy]
-                [-O obj] [-R release] [-S seed] [-T tools]
+                [-c compiler>] [-D dest] [-j njob] [-M obj] [-m mach]
+                [-N noisy] [-O obj] [-R release] [-S seed] [-T tools]
                 [-V var=[value]] [-w wrapper] [-X x11src] [-Y extsrcsrc]
                 [-Z var]
                 operation [...]
@@ -1081,6 +1081,10 @@ Usage: ${progname} [-EhnoPRrUuxy] [-a ar
     -a arch        Set MACHINE_ARCH to arch.  [Default: deduced from MACHINE]
     -B buildid     Set BUILDID to buildid.
     -C cdextras    Append cdextras to CDEXTRA variable for inclusion on CD-ROM.
+    -c compiler    Select compiler:
+                       clang
+                       gcc
+                   [Default: gcc]
     -D dest        Set DESTDIR to dest.  [Default: destdir.MACHINE]
     -E             Set "expert" mode; disables various safety checks.
                    Should not be used without expert knowledge of the build system.
@@ -1130,7 +1134,7 @@ Usage: ${progname} [-EhnoPRrUuxy] [-a ar
 
 parseoptions()
 {
-	opts='a:B:C:D:Ehj:M:m:N:nO:oPR:rS:T:UuV:w:X:xY:yZ:'
+	opts='a:B:C:c:D:Ehj:M:m:N:nO:oPR:rS:T:UuV:w:X:xY:yZ:'
 	opt_a=false
 	opt_m=false
 
@@ -1176,6 +1180,21 @@ parseoptions()
 			CDEXTRA="${CDEXTRA}${CDEXTRA:+ }${OPTARG}"
 			;;
 
+		-c)
+			eval ${optargcmd}
+			case "${OPTARG}" in
+			gcc)	# default, no variables needed
+				;;
+			clang)	setmakeenv HAVE_LLVM yes
+				setmakeenv MKLLVM yes
+				setmakeenv MKGCC no
+				;;
+			#pcc)	...
+			#	;;
+			*)	bomb "Unknown compiler: ${OPTARG}"
+			esac
+			;;
+
 		-D)
 			eval ${optargcmd}; resolvepath OPTARG
 			setmakeenv DESTDIR "${OPTARG}"
diff -r 1b8d2bba14ba -r 569bb898a448 doc/BUILDING.mdoc
--- a/doc/BUILDING.mdoc	Tue Jun 30 20:27:09 2020 +0000
+++ b/doc/BUILDING.mdoc	Tue Jun 30 20:54:46 2020 +0000
@@ -1693,6 +1693,23 @@ Multiple paths may be specified via mult
 options, or via a single option whose argument contains multiple
 space-separated paths.
 .
+.It Fl c Ar compiler
+Select the compiler for the toolchain to build
+.Nx
+and for inclusion in the
+.Nx
+distribution.
+Supported choices:
+.Bl -inset -offset indent
+.It clang
+.It gcc
+[default]
+.El
+.Pp
+The compiler used to build the toolchain can be different; see
+.Sy HOST_CC
+and
+.Sy HOST_CXX .
 .It Fl D Ar dest
 Set the value of
 .Sy DESTDIR