[PATCH 1/1] riscv: Support building with Clang

[kleines Filmröllchen]

The -ffixed-gp option of GCC has an exact equivalent of -ffixed-x3 in
Clang.

Signed-off-by: kleines Filmröllchen <filmroellchen at serenityos.org>
---

 arch/riscv/config.mk | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/config.mk b/arch/riscv/config.mk
index 9cf2aef0a4..dc4f30d673 100644
--- a/arch/riscv/config.mk
+++ b/arch/riscv/config.mk
@@ -9,6 +9,9 @@
 # Copyright (C) 2017 Andes Technology Corporation
 # Rick Chen, Andes Technology Corporation <rick at andestech.com>
 #
+# Copyright (C) 2024 the SerenityOS project
+# kleines Filmröllchen <filmroellchen at serenityos.org>
+#
 
 32bit-emul		:= elf32lriscv
 64bit-emul		:= elf64lriscv
@@ -25,7 +28,12 @@ EFI_LDS			:= elf_riscv64_efi.lds
 PLATFORM_ELFFLAGS	+= -B riscv -O elf64-littleriscv
 endif
 
-PLATFORM_CPPFLAGS	+= -ffixed-gp -fpic
+PLATFORM_CPPFLAGS	+= -fpic
+ifeq ($(cc-name),clang)
+PLATFORM_CPPFLAGS   += -ffixed-x3
+else
+PLATFORM_CPPFLAGS   += -ffixed-gp
+endif
 PLATFORM_RELFLAGS	+= -fno-common -ffunction-sections -fdata-sections
 LDFLAGS_u-boot		+= --gc-sections -static -pie
 
-- 
2.39.2