From 88cac04de3c256cfdb629a181c5e0d5d4b3725c2 Mon Sep 17 00:00:00 2001
From: Abel Bernabeu <abel@x-silicon.com>
Date: Mon, 4 Jul 2022 10:55:51 +0200
Subject: [PATCH] package/llvm: Support for RISC-V on the LLVM package

The initial support for the LLVM package did not include RISC-V, and
needed to be added. Some special casing is needed for the
LLVM_TARGETS_TO_BUILD variable, which expects a RISCV value regardless
of whether riscv32 or riscv64 is chosen.

Signed-off-by: Abel Bernabeu <abel@x-silicon.com>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 package/llvm/Config.in | 3 +++
 package/llvm/llvm.mk   | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/package/llvm/Config.in b/package/llvm/Config.in
index c1887e36dd..768af4971e 100644
--- a/package/llvm/Config.in
+++ b/package/llvm/Config.in
@@ -4,12 +4,15 @@ config BR2_PACKAGE_LLVM_ARCH_SUPPORTS
 	default y if BR2_x86_64
 	default y if BR2_aarch64
 	default y if BR2_arm || BR2_armeb
+	default y if BR2_riscv
 
 config BR2_PACKAGE_LLVM_TARGET_ARCH
 	string
 	default "AArch64" if BR2_aarch64
 	default "ARM" if BR2_arm || BR2_armeb
 	default "X86" if BR2_i386 || BR2_x86_64
+	default "riscv32" if BR2_riscv && !BR2_ARCH_IS_64
+	default "riscv64" if BR2_riscv && BR2_ARCH_IS_64
 
 config BR2_PACKAGE_LLVM
 	bool "llvm"
diff --git a/package/llvm/llvm.mk b/package/llvm/llvm.mk
index 4670773ca3..977c0a08c2 100644
--- a/package/llvm/llvm.mk
+++ b/package/llvm/llvm.mk
@@ -41,8 +41,13 @@ HOST_LLVM_CONF_OPTS += -DCMAKE_INSTALL_RPATH="$(HOST_DIR)/lib"
 # Get target architecture
 LLVM_TARGET_ARCH = $(call qstrip,$(BR2_PACKAGE_LLVM_TARGET_ARCH))
 
-# Build backend for target architecture. This include backends like AMDGPU.
+# Build backend for target architecture. This include backends like
+# AMDGPU. We need to special case RISCV.
+ifneq ($(filter riscv%,$(LLVM_TARGET_ARCH)),)
+LLVM_TARGETS_TO_BUILD = RISCV
+else
 LLVM_TARGETS_TO_BUILD = $(LLVM_TARGET_ARCH)
+endif
 HOST_LLVM_CONF_OPTS += -DLLVM_TARGETS_TO_BUILD="$(subst $(space),;,$(LLVM_TARGETS_TO_BUILD))"
 LLVM_CONF_OPTS += -DLLVM_TARGETS_TO_BUILD="$(subst $(space),;,$(LLVM_TARGETS_TO_BUILD))"