chore(deps): bump libc from 0.2.186 to 0.2.187

[dependabot]

Bumps libc from 0.2.186 to 0.2.187.

Release notes

Sourced from libc's releases.

0.2.187

This release contains a number of improvements related to 64-bit time_t configuration. Of note the existing RUST_LIBC_UNSTABLE_* environment variables have been replaced with configuration options. The new way to use these is:

RUSTFLAGS='--cfg=libc_unstable_musl_v1_2_3' cargo ...
RUSTFLAGS='--cfg=libc_unstable_gnu_time_bits="64"' cargo ...

Being able to set this via RUSTFLAGS makes it easier to only apply configuration to specific targets (and notably, not the host if build scripts are used).

There are two other notable changes:

• The 32-bit windows-gnu targets now respect libc_unstable_gnu_time_bits

• uClibc now supports a similar configuration option:

  RUSTFLAGS='--cfg=libc_unstable_uclibc_time64'

As a reminder, these options are under active development and may change in the future (hence the "unstable" in the name). It likely that we will harmonize everything under a single configuration option before considering them stable.

Support

• Add support for aarch64-unknown-linux-pauthtest (#5065)
• Add support for new QNX targets (#5241)
• Better document breaking change policy and recommended usage (#5179)

Added

• Android: Add POSIX_SPAWN_* constants (#5104)
• Android: Add getpwent, setpwent, and endpwent (#5160)
• Android: Add preadv2 and pwritev2 (#5157)
• Android: Add seccomp_notif* structures (#5224)
• Android: Add timer_[create, delete, getoverrun, gettime, settime] (#5108)
• Apple: Add PROC_PIDT_SHORTBSDINFO and proc_bsdshortinfo (#5110)
• Apple: Add SIOC* constants from sockio.h (#5263)
• Apple: Add _IOR, _IOW, _IOWR (#5264)
• Apple: Add bpf_program and bpf_insn (#5235)
• Apple: Add additional kqueue constants (#5077)
• Apple: Update vm_statistics64 with recently added fields (#5253)
• Apple: add IN6_IFF_* and SIOCGIFAFLAG_IN6 (#5239)
• Dragonfly: Add O_*, POSIX_FADV_*, NI*, and a few other missing constants (#5116)
• Dragonfly: add fdatasync, dlvsym, reallocarray, qsort_r, pthread_*affinity_np, ftok, extattr_*, and dup3 (#5116)
• Emscripten: Add in6_pktinfo (#5256)
• FreeBSD: Add SOL_LOCAL (#5185)

... (truncated)

Changelog

Sourced from libc's changelog.

0.2.187 - 2026-07-20

This release contains a number of improvements related to 64-bit time_t configuration. Of note the existing RUST_LIBC_UNSTABLE_* environment variables have been replaced with configuration options. The new way to use these is:

RUSTFLAGS='--cfg=libc_unstable_musl_v1_2_3' cargo ...
RUSTFLAGS='--cfg=libc_unstable_gnu_time_bits="64"' cargo ...

Being able to set this via RUSTFLAGS makes it easier to only apply configuration to specific targets (and notably, not the host if build scripts are used).

There are two other notable changes:

• The 32-bit windows-gnu targets now respect libc_unstable_gnu_time_bits

• uClibc now supports a similar configuration option:

  RUSTFLAGS='--cfg=libc_unstable_uclibc_time64'

As a reminder, these options are under active development and may change in the future (hence the "unstable" in the name). It likely that we will harmonize everything under a single configuration option before considering them stable.

Support

• Add support for aarch64-unknown-linux-pauthtest (#5065)
• Add support for new QNX targets (#5241)
• Better document breaking change policy and recommended usage (#5179)

Added

• Android: Add POSIX_SPAWN_* constants (#5104)
• Android: Add getpwent, setpwent, and endpwent (#5160)
• Android: Add preadv2 and pwritev2 (#5157)
• Android: Add seccomp_notif* structures (#5224)
• Android: Add timer_[create, delete, getoverrun, gettime, settime] (#5108)
• Apple: Add PROC_PIDT_SHORTBSDINFO and proc_bsdshortinfo (#5110)
• Apple: Add SIOC* constants from sockio.h (#5263)
• Apple: Add _IOR, _IOW, _IOWR (#5264)
• Apple: Add bpf_program and bpf_insn (#5235)
• Apple: Add additional kqueue constants (#5077)
• Apple: Update vm_statistics64 with recently added fields (#5253)
• Apple: add IN6_IFF_* and SIOCGIFAFLAG_IN6 (#5239)
• Dragonfly: Add O_*, POSIX_FADV_*, NI*, and a few other missing constants (#5116)
• Dragonfly: add fdatasync, dlvsym, reallocarray, qsort_r, pthread_*affinity_np, ftok, extattr_*, and dup3 (#5116)
• Emscripten: Add in6_pktinfo (#5256)

... (truncated)

Commits

• ee05190 libc: Release 0.2.187
• 13b2218 unix: add preadv2 and pwritev2 to android
• abc9903 docs: Improve the pull request template and CONTRIBUTING.md
• c452b48 util: Restructure to use one class per subcommand
• cbc70c9 nuttx: more document comments
• 2589ea3 nuttx: add TCP_MAXSEG definitions
• 6be50c1 nuttx: add pipe2 definitions
• 4500344 nuttx: add poll definitions
• 60c1cc9 nuttx: add fcntl definitions
• 3b2c2d4 nuttx: add eventfd definitions
• Additional commits viewable in compare view

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[tangletools]

✅ No Blockers — af27ebf0

Review health 100/100 · Reviewer score 95/100 · Confidence 65/100 · 0 findings (none)

glm: Correctness 95 · Security 95 · Testing 95 · Architecture 95

Reviewer score is advisory once the run is complete and the verdict has no blockers.

Full multi-shot audit completed 1/1 planned shots over 1 changed files. Global verifier still owns final merge decision.

No findings.

---

_{tangletools · 2026-07-21T03:16:39Z · trace}

[tangletools]

✅ Clean — af27ebf0

Full multi-shot audit completed 1/1 planned shots over 1 changed files. Global verifier still owns final merge decision.

Full immutable report for this review: trace

Summary comment for this run: full summary

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_{tangletools · 2026-07-21T03:16:39Z · immutable trace}