Add attiny404 target spec

Author: agausmann

avr-specs/avr-attiny404.json

@@ -0,0 +1,25 @@
+{
+  "arch": "avr",
+  "atomic-cas": false,
+  "cpu": "attiny404",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+  "eh-frame-header": false,
+  "exe-suffix": ".elf",
+  "executables": true,
+  "late-link-args": {
+    "gcc": [
+      "-lgcc"
+    ]
+  },
+  "linker": "avr-gcc",
+  "llvm-target": "avr-unknown-unknown",
+  "max-atomic-width": 8,
+  "no-default-libraries": false,
+  "pre-link-args": {
+    "gcc": [
+      "-mmcu=attiny404"
+    ]
+  },
+  "target-c-int-width": "16",
+  "target-pointer-width": "16"
+}

avr-specs/sync-from-upstream.py

@@ -34,6 +34,9 @@
     "attiny167": {
         "cpu": "attiny167",
     },
+    "attiny404": {
+        "cpu": "attiny404",
+    },
     "attiny2313": {
         "cpu": "attiny2313",
     },