[PATCH v5 3/3] riscv: optimized memset

[Emil Renner Berthing]

Hi Ley Foon,

You're right it doesn't boot for me either when building with

  make ARCH=riscv LLVM=1

The following patch fixes it for me though. In hindsigt it's perhaps a
bit surprising it works without -ffreestanding in GCC.

/Emil

---
 arch/riscv/lib/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index e33263cc622a..6dfa919d4cd6 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -4,4 +4,9 @@ lib-$(CONFIG_MMU)	+= uaccess.o
 lib-$(CONFIG_64BIT)	+= tishift.o
 lib-$(CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE) += string.o
 
+# string.o implements standard library functions like memset/memcpy etc.
+# Use -ffreestanding to ensure that the compiler does not try to "optimize"
+# them into calls to themselves.
+CFLAGS_string.o := -ffreestanding
+
 obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
-- 
2.34.1