add zig cc

.github/workflows/build.yml

@@ -17,14 +17,18 @@ jobs:
           - milkv-duos
           - milkv-jupiter
           - milkv-jupiter-clang
+          # - milkv-jupiter-zig
           - qemu-riscv64
           - qemu-riscv64-clang
+          - qemu-riscv64-zig
     steps:
       - name: Install dependencies
         run: |
           toolchain_pkgs=""
           target=${{ matrix.target }}
-          if [[ ${target} == *"clang" ]]; then
+          if [[ ${target} == *"zig" ]]; then
+            toolchain_pkgs="zig clang lld llvm"
+          elif [[ ${target} == *"clang" ]]; then
             toolchain_pkgs="clang lld llvm"
           else
             toolchain_pkgs="binutils-riscv-none-elf gcc-riscv-none-elf"
@@ -52,7 +56,9 @@ jobs:
           mkdir build
           cd build
           target=${{ matrix.target }}
-          if [[ ${target} == *"clang" ]]; then
+          if [[ ${target} == *"zig" ]]; then
+            ../configure --target ${target::-4} --zig
+          elif [[ ${target} == *"clang" ]]; then
             ../configure --target ${target::-6} --clang
           else
             ../configure --target ${target}

configure

@@ -30,7 +30,7 @@ known_arches=(riscv64)
 # shellcheck disable=SC2034 # Only accessed indirectly.
 tool_prefixes_riscv64=(riscv64-none-elf- riscv-none-elf- riscv64-unknown-elf-)
 
-args=$(getopt -n ./configure -o 'h' -l 'arch:,help,no-default-cflags,clang,prefix:,target:' -- "$@")
+args=$(getopt -n ./configure -o 'h' -l 'arch:,help,no-default-cflags,clang,zig,prefix:,target:' -- "$@")
 eval set -- "$args"
 unset args
 
@@ -41,6 +41,7 @@ default_cflags=1
 default_ldflags=1
 help=0
 clang=0
+zig=0
 prefix=/
 while true; do
 	case "$1" in
@@ -68,6 +69,10 @@ while true; do
 		clang=1
 		shift
 		;;
+	--zig)
+		zig=1
+		shift
+		;;
 	--no-default-cflags)
 		default_cflags=0
 		shift
@@ -169,7 +174,15 @@ find_tool_with_prefix() {
 	find_tool "$tool_name" "${tools[@]}"
 }
 
-if [[ "$clang" = 1 ]]; then
+if [[ "$zig" = 1 ]]; then
+	CC="zig cc"
+  if [[ "$default_cflags" = 1 ]]; then
+	  CFLAGS="--no-warnings $CFLAGS"
+  fi
+  if [[ "$default_ldflags" = 1 ]]; then
+	  LDFLAGS="-fuse-ld=lld $LDFLAGS"
+  fi
+elif [[ "$clang" = 1 ]]; then
 	find_tool_with_prefix CC clang
   if [[ "$default_cflags" = 1 ]]; then
 	  CFLAGS="-target riscv64-none-elf -Wno-error=\#warnings $CFLAGS"
@@ -200,7 +213,7 @@ prefix = $(printf %q "$prefix")
 srcdir = $(printf %q "$repo")
 target = $(printf %q "$target")
 
-CC = $(printf %q "$CC")
+CC = $(printf "$CC")
 GDB = $(printf %q "$GDB")
 OBJDUMP = $(printf %q "$OBJDUMP")
 PYTHON3 = $(printf %q "$PYTHON3")

flake.nix

@@ -49,6 +49,7 @@
               pkgs.pkgsCross.riscv64-embedded.buildPackages.llvmPackages.lld
               pkgs.python3
               pkgs.watchexec
+              pkgs.zig
             ];
 
             dontUnpack = true;

src/targets/riscv64/qemu-riscv64.mak

@@ -2,5 +2,9 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-kernel-cflags += -march=rv64imafdcbv_zicsr_zicntr_zihpm_ziccif_ziccrse_ziccamoa_zicclsm_zic64b_za64rs_zihintpause_zba_zbb_zbs_zicbom_zicbop_zicboz_zfhmin_zkt_zvfhmin_zvbb_zvkt_zihintntl_zicond_zimop_zcmop_zcb_zfa_zawrs_svpbmt_svinval_svnapot_sstc_sscofpmf_zifencei
+ifeq ($(findstring zig,$(CC)),zig)
+  kernel-cflags += -target riscv64-freestanding-none
+else
+  kernel-cflags += -march=rv64imafdcbv_zicsr_zicntr_zihpm_ziccif_ziccrse_ziccamoa_zicclsm_zic64b_za64rs_zihintpause_zba_zbb_zbs_zicbom_zicbop_zicboz_zfhmin_zkt_zvfhmin_zvbb_zvkt_zihintntl_zicond_zimop_zcmop_zcb_zfa_zawrs_svpbmt_svinval_svnapot_sstc_sscofpmf_zifencei
+endif
 target-qemuflags = --machine virt --cpu rva23s64 --smp 2 -m 1G --netdev user,id=net0 -device rtl8139,netdev=net0,bus=pcie.0