test using a JSON target file

src/tools/miri/ci.sh

@@ -110,6 +110,7 @@ case $HOST_TARGET in
     MIRI_TEST_TARGET=aarch64-linux-android run_tests_minimal hello integer vec panic/panic
     MIRI_TEST_TARGET=wasm32-wasi MIRI_NO_STD=1 run_tests_minimal no_std # supports std but miri doesn't support it
     MIRI_TEST_TARGET=thumbv7em-none-eabihf MIRI_NO_STD=1 run_tests_minimal no_std # no_std embedded architecture
+    MIRI_TEST_TARGET=tests/avr.json MIRI_NO_STD=1 run_tests_minimal no_std # JSON target file
     ;;
   x86_64-apple-darwin)
     MIRI_TEST_TARGET=mips64-unknown-linux-gnuabi64 run_tests # big-endian architecture

src/tools/miri/tests/avr.json

@@ -0,0 +1,25 @@
+{
+  "arch": "avr",
+  "cpu": "atmega328p",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+  "env": "",
+  "executables": true,
+  "linker": "avr-gcc",
+  "linker-flavor": "gcc",
+  "linker-is-gnu": true,
+  "llvm-target": "avr-unknown-unknown",
+  "os": "unknown",
+  "position-independent-executables": false,
+  "exe-suffix": ".elf",
+  "eh-frame-header": false,
+  "pre-link-args": {
+    "gcc": ["-mmcu=atmega328p"]
+  },
+  "late-link-args": {
+    "gcc": ["-lgcc"]
+  },
+  "target-c-int-width": "16",
+  "target-endian": "little",
+  "target-pointer-width": "16",
+  "vendor": "unknown"
+}