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chore(docs): RFC 0015 opportunistic no_std#1964

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add_no_std_manifesto
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chore(docs): RFC 0015 opportunistic no_std#1964
pawelchcki wants to merge 1 commit into
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add_no_std_manifesto

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@pawelchcki pawelchcki commented May 9, 2026

What does this PR do?

Adds RFC 0015 proposing a workspace policy: prefer no_std + alloc; use std only where it earns its keep.

Motivation

no_std is, for a lot of what libdatadog does, the better Rust. core makes async-signal-unsafe items unreachable by construction (relevant for crashtracker and profiling samplers), embedders linking statically pay for less code, and once a crate is no_std every new dependency comes with a forced "what does this drag in?" review.

Many migrations are mechanical (std::core::, see yaml/yaml-serde#8). #1770 is the in-flight reference implementation for libdd-library-config.

How to test the change?

Read it. Comment if you disagree.

Propose a workspace policy that prefers `no_std + alloc` and uses
`std` only where it earns its keep. Motivated by signal safety,
smaller artifacts, and tighter dependency hygiene.
@pawelchcki pawelchcki force-pushed the add_no_std_manifesto branch from 666e263 to 6da17cf Compare May 9, 2026 17:41
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datadog-official Bot commented May 9, 2026

🎯 Code Coverage (details)
Patch Coverage: 100.00%
Overall Coverage: 72.62% (-0.01%)

This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 6da17cf | Docs | Datadog PR Page | Give us feedback!

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.62%. Comparing base (91fd13c) to head (6da17cf).

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #1964      +/-   ##
==========================================
- Coverage   72.63%   72.62%   -0.01%     
==========================================
  Files         448      448              
  Lines       73582    73582              
==========================================
- Hits        53443    53436       -7     
- Misses      20139    20146       +7     
Components Coverage Δ
libdd-crashtracker 65.00% <ø> (-0.07%) ⬇️
libdd-crashtracker-ffi 36.82% <ø> (ø)
libdd-alloc 98.77% <ø> (ø)
libdd-data-pipeline 86.58% <ø> (ø)
libdd-data-pipeline-ffi 75.64% <ø> (ø)
libdd-common 79.81% <ø> (ø)
libdd-common-ffi 74.41% <ø> (ø)
libdd-telemetry 69.37% <ø> (ø)
libdd-telemetry-ffi 19.37% <ø> (ø)
libdd-dogstatsd-client 82.64% <ø> (ø)
datadog-ipc 76.22% <ø> (ø)
libdd-profiling 81.57% <ø> (ø)
libdd-profiling-ffi 64.51% <ø> (ø)
libdd-sampling 97.25% <ø> (ø)
datadog-sidecar 29.82% <ø> (-0.02%) ⬇️
datdog-sidecar-ffi 13.22% <ø> (ø)
spawn-worker 54.69% <ø> (ø)
libdd-tinybytes 93.16% <ø> (ø)
libdd-trace-normalization 81.71% <ø> (ø)
libdd-trace-obfuscation 87.26% <ø> (ø)
libdd-trace-protobuf 68.25% <ø> (ø)
libdd-trace-utils 89.27% <ø> (ø)
libdd-tracer-flare 86.88% <ø> (ø)
libdd-log 74.83% <ø> (ø)
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dd-octo-sts Bot commented May 9, 2026

Artifact Size Benchmark Report

aarch64-alpine-linux-musl
Artifact Baseline Commit Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so 7.57 MB 7.57 MB 0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a 81.66 MB 81.66 MB 0% (0 B) 👌
aarch64-unknown-linux-gnu
Artifact Baseline Commit Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a 97.84 MB 97.84 MB 0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so 10.01 MB 10.01 MB 0% (0 B) 👌
libdatadog-x64-windows
Artifact Baseline Commit Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll 24.40 MB 24.40 MB 0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib 79.87 KB 79.87 KB 0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb 179.65 MB 179.64 MB -0% (-8.00 KB) 👌
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib 910.67 MB 910.67 MB 0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll 7.71 MB 7.71 MB 0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib 79.87 KB 79.87 KB 0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb 23.11 MB 23.11 MB 0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib 45.25 MB 45.25 MB 0% (0 B) 👌
libdatadog-x86-windows
Artifact Baseline Commit Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll 21.02 MB 21.02 MB 0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib 81.11 KB 81.11 KB 0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb 183.76 MB 183.76 MB -0% (-8.00 KB) 👌
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib 896.93 MB 896.93 MB 0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll 5.98 MB 5.98 MB 0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib 81.11 KB 81.11 KB 0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb 24.74 MB 24.74 MB 0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib 42.75 MB 42.75 MB 0% (0 B) 👌
x86_64-alpine-linux-musl
Artifact Baseline Commit Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a 72.78 MB 72.78 MB 0% (0 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so 8.41 MB 8.41 MB 0% (0 B) 👌
x86_64-unknown-linux-gnu
Artifact Baseline Commit Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a 90.53 MB 90.53 MB 0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so 10.03 MB 10.03 MB 0% (0 B) 👌

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