builds: Enable lld, optimize linking more, faster cargo-test build

Author: def-

.cargo/config

@@ -13,8 +13,9 @@
 # Sync: This target-cpu and list of features should be kept in sync with the ones in ci-builder and
 # xcompile.
 rustflags = [
-    "-C",
-    "link-arg=-Wl,--compress-debug-sections=zlib-gabi",
+    "-Clink-arg=-Wl,--compress-debug-sections=zlib",
+    "-Clink-arg=-Wl,-O2",
+    "-Clink-arg=-fuse-ld=lld",
     "-Csymbol-mangling-version=v0",
     "-Ctarget-cpu=x86-64-v3",
     "-Ctarget-feature=+aes",
@@ -31,8 +32,9 @@ rustflags = [
 # xcompile.
 [target."aarch64-unknown-linux-gnu"]
 rustflags = [
-    "-C",
-    "link-arg=-Wl,--compress-debug-sections=zlib-gabi",
+    "-Clink-arg=-Wl,--compress-debug-sections=zlib",
+    "-Clink-arg=-Wl,-O2",
+    "-Clink-arg=-fuse-ld=lld",
     "-Csymbol-mangling-version=v0",
     "-Ctarget-cpu=neoverse-n1",
     "-Ctarget-feature=+aes,+sha2",
@@ -43,3 +45,7 @@ rustflags = [
 # Always reserve at least one core so Cargo doesn't pin our CPU
 jobs = -1
 rustflags = ["--cfg=tokio_unstable"]
+
+[profile.ci]
+inherits = "dev"
+debug = "line-tables-only"

ci/test/cargo-test/mzcompose.py

@@ -122,6 +122,7 @@ def workflow_default(c: Composition, parser: WorkflowArgumentParser) -> None:
                     "build",
                     "--bin",
                     "clusterd",
+                    "--profile=ci",
                 ],
                 env=env,
             )
@@ -138,6 +139,7 @@ def workflow_default(c: Composition, parser: WorkflowArgumentParser) -> None:
                     "nextest",
                     "run",
                     "--profile=ci",
+                    "--cargo-profile=ci",
                     f"--partition=count:{partition}/{total}",
                     # Most tests don't use 100% of a CPU core, so run two tests per CPU.
                     # TODO(def-): Reenable when #19931 is fixed

ci/test/pipeline.template.yml

@@ -195,6 +195,7 @@ steps:
         artifact_paths: [junit_*.xml, target/nextest/ci/junit_cargo-test.xml]
         inputs:
           - Cargo.lock
+          - ".config/nextest.toml"
           - "**/Cargo.toml"
           - "**/*.rs"
           - "**/*.proto"