make rust-analyzer settings use dedicated directory

This avoids rust-analyzer having to wait for a build lock due to ./x
running other commands (and the other way around).

This was inspired by Helix settings.

Author: tshepang

src/etc/rust_analyzer_eglot.el

@@ -6,7 +6,9 @@
                                        :overrideCommand ["python3"
                                                          "x.py"
                                                          "check"
-                                                         "--json-output"])
+                                                         "--json-output"
+                                                         "--build-dir"
+                                                         "build/rust-analyzer"])
                  :linkedProjects ["Cargo.toml"
                                   "compiler/rustc_codegen_cranelift/Cargo.toml"
                                   "compiler/rustc_codegen_gcc/Cargo.toml"
@@ -23,7 +25,9 @@
                                                   :overrideCommand ["python3"
                                                                     "x.py"
                                                                     "check"
-                                                                    "--json-output"])
+                                                                    "--json-output"
+                                                                    "--build-dir"
+                                                                    "build/rust-analyzer"])
                                         :sysrootSrc "./library"
                                         :extraEnv (:RUSTC_BOOTSTRAP "1"))
                  :rustc ( :source "./Cargo.toml" )))))))

src/etc/rust_analyzer_settings.json

@@ -5,7 +5,9 @@
         "python3",
         "x.py",
         "check",
-        "--json-output"
+        "--json-output",
+        "--build-dir",
+        "build/rust-analyzer"
     ],
     "rust-analyzer.linkedProjects": [
         "Cargo.toml",
@@ -27,7 +29,9 @@
         "python3",
         "x.py",
         "check",
-        "--json-output"
+        "--json-output",
+        "--build-dir",
+        "build/rust-analyzer"
     ],
     "rust-analyzer.cargo.sysrootSrc": "./library",
     "rust-analyzer.rustc.source": "./Cargo.toml",

src/etc/rust_analyzer_zed.json

@@ -7,7 +7,14 @@
             "enable": true,
             "invocationLocation": "root",
             "invocationStrategy": "once",
-            "overrideCommand": ["python3", "x.py", "check", "--json-output"]
+            "overrideCommand": [
+              "python3",
+              "x.py",
+              "check",
+              "--json-output",
+              "--build-dir",
+              "build/rust-analyzer"
+            ]
           },
           "extraEnv": {
             "RUSTC_BOOTSTRAP": "1"
@@ -17,7 +24,14 @@
         "check": {
           "invocationLocation": "root",
           "invocationStrategy": "once",
-          "overrideCommand": ["python3", "x.py", "check", "--json-output"]
+          "overrideCommand": [
+            "python3",
+            "x.py",
+            "check",
+            "--json-output",
+            "--build-dir",
+            "build/rust-analyzer"
+          ]
         },
         "linkedProjects": [
           "Cargo.toml",