Patch which demonstrates needed modifications in order to compile Unikraft apps on Aarch64 using clang

README.md

Credits go to michpappas for providing this facil workaround.

• After modifying the files accordingly, build using

make CC=clang LD=~/toolchains/gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf/bin/aarch64-none-elf-gcc OBJCOPY=~/toolchains/gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf/bin/aarch64-none-elf-objcopy STRIP=~/toolchains/gcc-arm-11.2-2022.02-x86_64-aarch64-none-elf/bin/aarch64-none-elf-strip

• You'll need the gcc cross-compiling toolchain installed. Get it from here.

• Also, make sure to have erratum options disabled when using menuconfig (Architecture Selection -> Arm8 Compatible -> Workaround for [...] erratum).

• What's more, you'll have to configure the Custom cross-compiler LLVM target too (Build Options -> Custom cross-compiler LLVM target); just write aarch64-none-elf and you should be good to go.

• As one of my professors used to say: "Trivial".

unikraft-build-Aarch64-clang.patch

diff --git a/Makefile b/Makefile
index e9f4044..b00796e 100644
--- a/Makefile
+++ b/Makefile
@@ -616,6 +616,10 @@ CC_VERSION	:= $(shell $(CC) --version | \
 CC_VER_MAJOR   := $(word 1,$(subst ., ,$(CC_VERSION)))
 CC_VER_MINOR   := $(word 2,$(subst ., ,$(CC_VERSION)))
 
+CFLAGS          += --target=$(CONFIG_LLVM_TARGET_ARCH)
+ASFLAGS         += --target=$(CONFIG_LLVM_TARGET_ARCH)
+CXXFLAGS        += --target=$(CONFIG_LLVM_TARGET_ARCH)
+
 ASFLAGS		+= -DCC_VERSION=$(CC_VERSION)
 CFLAGS		+= -DCC_VERSION=$(CC_VERSION)
 CXXFLAGS	+= -DCC_VERSION=$(CC_VERSION)
diff --git a/plat/common/pci_ecam.c b/plat/common/pci_ecam.c
index c884f11..7c069db 100644
--- a/plat/common/pci_ecam.c
+++ b/plat/common/pci_ecam.c
@@ -226,7 +226,7 @@ int gen_pci_irq_parse(const fdt32_t *addr, struct fdt_phandle_args *out_irq)
 	fdt32_t initial_match_array[16];
 	const fdt32_t *match_array = initial_match_array;
 	const fdt32_t *tmp, *imap, *imask;
-	const fdt32_t dummy_imask[] = { [0 ... 16] = cpu_to_fdt32(~0) };
+	const fdt32_t dummy_imask[] = { 0 };
 	int intsize, newintsize;
 	int addrsize, newaddrsize = 0;
 	int imaplen, match, i, rc = -EINVAL;