From e48503fffdddc896a21ae2891975c41645c4cfb4 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 8 Jan 2020 17:25:59 +0000
Subject: [PATCH] Use clang and lld as the default toolchain for RISCV.

- Enable clang and lld as system toolchains.
- Don't use external GCC for universe by default.
- Re-enable riscv64sf since it builds fine with clang + lld.

Reviewed by:	emaste, mhorne
Relnotes:	yes
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D23089
---
 Makefile              | 7 ++-----
 share/man/man7/arch.7 | 6 +++---
 share/mk/src.opts.mk  | 5 ++---
 3 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/Makefile b/Makefile
index 4ed469a60b95..f78a1b040c15 100644
--- a/Makefile
+++ b/Makefile
@@ -495,23 +495,20 @@ TARGET_ARCHES_arm64?=	aarch64
 TARGET_ARCHES_mips?=	mipsel mips mips64el mips64 mipsn32 mipselhf mipshf mips64elhf mips64hf
 # powerpcspe excluded until clang fixed
 TARGET_ARCHES_powerpc?=	powerpc powerpc64
-# riscv64sf excluded due to PR 232085
-TARGET_ARCHES_riscv?=	riscv64
+TARGET_ARCHES_riscv?=	riscv64 riscv64sf
 .for target in ${TARGETS}
 TARGET_ARCHES_${target}?= ${target}
 .endfor
 
-MAKE_PARAMS_riscv?=	CROSS_TOOLCHAIN=riscv64-gcc
 MAKE_PARAMS_mips?=	CROSS_TOOLCHAIN=mips-gcc6
 MAKE_PARAMS_sparc64?=	CROSS_TOOLCHAIN=sparc64-gcc6
 
 TOOLCHAINS_mips=	mips-gcc6
-TOOLCHAINS_riscv=	riscv64-gcc
 TOOLCHAINS_sparc64=	sparc64-gcc6
 
 # Remove architectures only supported by external toolchain from
 # universe if required toolchain packages are missing.
-.for target in mips riscv sparc64
+.for target in mips sparc64
 .if ${_UNIVERSE_TARGETS:M${target}}
 .for toolchain in ${TOOLCHAINS_${target}}
 .if !exists(/usr/local/share/toolchains/${toolchain}.mk)
diff --git a/share/man/man7/arch.7 b/share/man/man7/arch.7
index 37e93f166b84..d6f86a87a55b 100644
--- a/share/man/man7/arch.7
+++ b/share/man/man7/arch.7
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 5, 2020
+.Dd January 8, 2020
 .Dt ARCH 7
 .Os
 .Sh NAME
@@ -319,8 +319,8 @@ This table shows the default tool chain for each architecture.
 .It powerpc     Ta Clang     Ta GNU ld 2.17.50
 .It powerpcspe  Ta Clang     Ta GNU ld 2.17.50
 .It powerpc64   Ta Clang     Ta lld
-.It riscv64     Ta GCC(1)    Ta GNU ld(1)
-.It riscv64sf   Ta GCC(1)    Ta GNU ld(1)
+.It riscv64     Ta Clang     Ta lld
+.It riscv64sf   Ta Clang     Ta lld
 .It sparc64     Ta GCC(1)    Ta GNU ld(1)
 .El
 .Pp
diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
index 6a0964281137..7ab49d85539c 100644
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -295,8 +295,7 @@ __DEFAULT_NO_OPTIONS+=LLVM_TARGET_BPF
 # If the compiler is not C++11 capable, disable Clang.  External toolchain will
 # be required.
 
-.if ${COMPILER_FEATURES:Mc++11} && (${__TT} != "mips" && \
-    ${__TT} != "riscv" && ${__TT} != "sparc64")
+.if ${COMPILER_FEATURES:Mc++11} && (${__TT} != "mips" && ${__TT} != "sparc64")
 # Clang is enabled, and will be installed as the default /usr/bin/cc.
 __DEFAULT_YES_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_IS_CC LLD
 .elif ${COMPILER_FEATURES:Mc++11} && ${__T} != "sparc64"
@@ -323,7 +322,7 @@ __DEFAULT_YES_OPTIONS+=LLVM_LIBUNWIND
 __DEFAULT_NO_OPTIONS+=LLVM_LIBUNWIND
 .endif
 .if ${__TT} != "mips" && ${__T} != "powerpc" && ${__T} != "powerpcspe" && \
-    ${__TT} != "riscv" && ${__T} != "sparc64"
+    ${__T} != "sparc64"
 __DEFAULT_YES_OPTIONS+=LLD_BOOTSTRAP LLD_IS_LD
 .else
 __DEFAULT_NO_OPTIONS+=LLD_BOOTSTRAP LLD_IS_LD