Compile

Compile ddprof (Ubuntu 24 dev container)

Builds all targets inside the Ubuntu 24 dev container. Default mode is Debug (gcc, no clang-tidy) — fastest iteration. Override via args when the user wants something else.

Args

args is a single optional token: the build mode.

Match args case-insensitively. If the user's natural-language request implies a mode (e.g. "do a release build", "run with sanitizers"), prefer that over the default. Do not set CC/CXX — DebTidyCMake passes the clang compiler flags to cmake directly; all other modes use the container's default gcc.

Step 1 — Find a running container

docker ps \
  --filter ancestor=base_ddprof_24 \
  --format '{{.ID}}' | head -1

Capture the output as CID. If non-empty → skip to Step 3.

Step 2 — Start one in the background (only if nothing is running)

Confirm an image exists:

docker image ls -f reference=base_ddprof_24 -q

If no image is present, stop and ask the user to run ./tools/launch_local_build.sh -u 24 once — the first-time image build is long and interactive. Do not try to build the image automatically.

If the image exists, start a detached container with the same mounts as the launch script (minus the interactive TTY and SSH agent):

CID=$(docker run -d --rm \
  -u "$(id -u):$(id -g)" \
  --network=host -w /app \
  --cap-add CAP_SYS_PTRACE --cap-add SYS_ADMIN \
  -v "$PWD:/app" \
  base_ddprof_24 \
  sleep infinity)

Note: uses sleep infinity so subsequent docker exec calls have a host to attach to. Let the user reclaim it; do not auto-kill.

Step 3 — Run the build via docker exec

Substitute <MODE> and <HELPER> from the table above. For modes other than DebTidy, omit the CC/CXX exports.

Example for the default (Deb):

docker exec "$CID" bash -lc '
  set -euo pipefail
  cd /app
  source ./setup_env.sh
  MkBuildDir Deb
  DebCMake ../
  ninja
'

Example for DebTidy:

docker exec "$CID" bash -lc '
  set -euo pipefail
  cd /app
  source ./setup_env.sh
  MkBuildDir DebTidy
  DebTidyCMake ../
  ninja
'

Backgrounding & exit codes

Long builds should run via Bash with run_in_background: true so the user isn't blocked. The Step-3 heredoc already runs under set -euo pipefail, so both forms below correctly propagate ninja's exit code:

• ninja > /tmp/ddprof_compile.log 2>&1 — simplest, log only
• ninja 2>&1 | tee /tmp/ddprof_compile.log — live output + log

(Outside a pipefail shell, tee would swallow ninja's failure — redirect instead in that case.)

After completion, check the exit code reported by the task notification first. Only inspect the log if it's non-zero. Use the pattern below to find errors, and fall back to tail if nothing matches so a real failure can never look like success:

errs=$(grep -nE "FAILED:|ninja: build stopped|error:|fatal error:|undefined reference|CMake Error|No space left|Killed" \
       /tmp/ddprof_compile.log | head -40)
if [ -n "$errs" ]; then
  printf '%s\n' "$errs"
else
  # Nothing matched a known marker — dump the tail so the agent never
  # silently reports success on a non-zero exit.
  tail -60 /tmp/ddprof_compile.log
fi

Surface the result (path:line + diagnostic) to the user — do not dump the whole log on success.

Notes

• Build directory is derived from MkBuildDir <suffix> and the host libc/compiler triple, e.g. build_gcc_unknown-linux-2.39_Deb, build_clang_unknown-linux-2.39_DebTidy. Each mode has its own dir, so switching modes does not clobber the previous build.
• ninja auto-detects core count; no -j flag needed.
• For Alpine/release builds, this skill is the wrong tool — see CLAUDE.md § "Alpine (release) builds".

Source: DataDog/ddprof — distributed by TomeVault.