target: add llvm-floatabi required value

Author: eupn

armv7a-unknown-xous-elf.json

@@ -0,0 +1,20 @@
+{
+  "abi": "eabihf",
+  "data-layout": "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64",
+  "is-builtin": false,
+  "linker-flavor": "ld.lld",
+  "linker": "rust-lld",
+  "llvm-floatabi": "hard",
+  "llvm-target": "armv7a-none-eabihf",
+  "target-pointer-width": "32",
+  "max-atomic-width": 64,
+  "panic-strategy": "abort",
+  "disable-redzone": true,
+  "emit-debug-gdb-scripts": false,
+  "c-enum-min-bits": 8,
+  "arch": "arm",
+  "features": "+v7,+thumb2,+thumb-mode,+vfp4d16,+d32,+neon,+strict-align",
+  "executables": true,
+  "relocation-model": "static",
+  "os": "xous"
+}