Flesh out various flags on toolchains

Author: dzbarsky

rs/experimental/toolchains/declare_rustc_toolchains.bzl

@@ -51,31 +51,48 @@ def declare_rustc_toolchains(
             cargo = "{}cargo".format(cargo_repo_label),
             clippy_driver = "{}clippy_driver_bin".format(clippy_repo_label),
             cargo_clippy = "{}cargo_clippy_bin".format(clippy_repo_label),
-            # TODO(zbarsky): Enable these once we ship them.
-            #llvm_cov = "@llvm//tools:llvm-cov",
-            #llvm_profdata = "@llvm//tools:llvm-profdata",
+            llvm_cov = "@llvm//tools:llvm-cov",
+            llvm_profdata = "@llvm//tools:llvm-profdata",
             rustc_lib = "{}rustc_lib".format(rustc_repo_label),
             allocator_library = None,
             global_allocator_library = None,
             binary_ext = select({
-                "@platforms//os:none": ".wasm",
+                "@platforms//os:emscripten": ".js",
+                "@platforms//os:uefi": ".efi",
                 "@platforms//os:windows": ".exe",
+                "@platforms//cpu:wasm32": ".wasm",
+                "@platforms//cpu:wasm64": ".wasm",
                 "//conditions:default": "",
             }),
             staticlib_ext = select({
                 "@platforms//os:none": "",
+                "@platforms//os:emscripten": ".js",
+                "@platforms//os:uefi": ".lib",
                 "@platforms//os:windows": ".lib",
                 "//conditions:default": ".a",
             }),
             dylib_ext = select({
-                "@platforms//os:none": "",
-                "@platforms//os:windows": ".dll",
+                "@platforms//cpu:wasm32": ".wasm",
+                "@platforms//cpu:wasm64": ".wasm",
+                "@platforms//os:none": ".so",
+                "@platforms//os:android": ".so",
+                "@platforms//os:emscripten": ".js",
+                "@platforms//os:fuchsia": ".so",
+                "@platforms//os:ios": ".dylib",
                 "@platforms//os:macos": ".dylib",
+                "@platforms//os:nixos": ".so",
+                "@platforms//os:uefi": "", # UEFI doesn't have dynamic linking
+                "@platforms//os:windows": ".dll",
                 "//conditions:default": ".so",
             }),
             stdlib_linkflags = select({
+                "@platforms//os:android": ["-ldl", "-llog"],
                 "@platforms//os:freebsd": ["-lexecinfo", "-lpthread"],
                 "@platforms//os:macos": ["-lSystem", "-lresolv"],
+                "@platforms//os:netbsd": ["-lpthread", "-lrt"],
+                "@platforms//os:nixos": ["-ldl", "-lpthread"],
+                "@platforms//os:openbsd": ["-lpthread"],
+                "@platforms//os:ios": ["-lSystem", "-lobjc", "-Wl,-framework,Security", "-Wl,-framework,Foundation", "-lresolv"],
                 # TODO: windows
                 "//conditions:default": [],
             }),