Add a target spec file for rx-none-elf

Author: yvt

build_sysroot/build_sysroot.sh

@@ -27,10 +27,10 @@ eval 'export CARGO_TARGET_${target_triple_upper}_RUSTFLAGS="$CARGO_TARGET_'${tar
 # Build libs
 if [[ "$1" == "--release" ]]; then
     sysroot_channel='release'
-    cargo build --target $TARGET_TRIPLE --release --verbose
+    cargo build --target $TARGET_SPEC --release --verbose
 else
     sysroot_channel='debug'
-    cargo build --target $TARGET_TRIPLE --features compiler_builtins/c
+    cargo build --target $TARGET_SPEC --features compiler_builtins/c
 fi
 
 # Copy files to sysroot

config.sh

@@ -32,7 +32,8 @@ if [[ "$HOST_TRIPLE" != "$TARGET_TRIPLE" ]]; then
        TARGET_TRIPLE="mips-unknown-linux-gnu"
        linker='-Clinker=m68k-linux-gcc'
    elif [[ "$TARGET_TRIPLE" == "rx-elf" ]]; then
-       TARGET_TRIPLE="mips-unknown-linux-gnu"
+       TARGET_TRIPLE="rx-none-elf"
+       TARGET_SPEC="$(pwd)/rx-none-elf.json"
        linker='-Clinker=rx-elf-gcc'
        export CC_${TARGET_TRIPLE//-/_}="rx-elf-gcc"
    elif [[ "$TARGET_TRIPLE" == "aarch64-unknown-linux-gnu" ]]; then
@@ -44,6 +45,11 @@ if [[ "$HOST_TRIPLE" != "$TARGET_TRIPLE" ]]; then
    fi
 fi
 
+if [ -z "$TARGET_SPEC" ]; then
+   TARGET_SPEC="$TARGET_TRIPLE"
+fi
+export TARGET_SPEC
+
 target_triple_upper="$(echo "$TARGET_TRIPLE" | tr '[:lower:]-' '[:upper:]_')"
 
 codegen_dylib="$(pwd)/target/${CHANNEL:-debug}/librustc_codegen_gcc.$dylib_ext"

rx-none-elf.json

@@ -0,0 +1,15 @@
+{
+  "arch": "mips",
+  "abi": "actually_rx",
+  "data-layout": "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64",
+  "emit-debug-gdb-scripts": false,
+  "executables": true,
+  "frame-pointer": "always",
+  "linker": "rx-elf-gcc",
+  "linker-flavor": "gcc",
+  "llvm-target": "thumbv7m-none-eabi",
+  "max-atomic-width": 32,
+  "panic-strategy": "abort",
+  "relocation-model": "static",
+  "target-pointer-width": "32"
+}