build: source jemalloc through Cargo

[hnwyllmm]

The CMake build currently requires platform-specific prebuilt jemalloc packages. This change resolves the official jemalloc 5.3.1 source through the locked seekdb-jemalloc-sys Cargo registry package, builds it out of tree, and links the generated PIC archive through an imported CMake target.

It preserves the existing je_* ABI and stats support, and removes jemalloc packages from all Linux dependency init manifests.

Validation:

• GitHub Actions SeekDB CI run 34580759006: full release compile, all four mysqltest slices, and collect passed
• GitHub Actions License header run 34580758878 passed
• Local full RelWithDebInfo seekdb build and link
• seekdb --version
• C++ malloc/realloc/aligned allocation/mallctl smoke check

[Copilot]

🟡 Changes recommended

Unresolved toolchain, architecture, header, and Bazel integration issues remain.

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Pull request overview

This PR replaces the platform-specific jemalloc RPM with a locked Cargo-sourced jemalloc 5.3.1 build integrated through CMake.

Changes:

• Adds locked Cargo dependency metadata.
• Builds and links a PIC jemalloc archive out of tree.
• Removes the AL8 x86_64 jemalloc RPM dependency.

Review findings:

• Critical: Clean CI may lack the pinned Rust toolchain.
• Moderate: Darwin architecture flags are not propagated.
• Moderate: Generated jemalloc headers are missing from sanity builds.
• Moderate: Bazel jemalloc dependencies are not migrated.

File summaries

File	Description
src/oblib/lib/CMakeLists.txt	Links allocator targets to jemalloc.
deps/init/oceanbase.al8.x86_64.deps	Removes the jemalloc RPM.
CMakeLists.txt	Includes the jemalloc integration.
cmake/native-deps/src/lib.rs	Provides the Cargo manifest anchor.
cmake/native-deps/README.md	Documents native dependency handling.
cmake/native-deps/Cargo.toml	Declares the pinned dependency.
cmake/native-deps/Cargo.lock	Locks the package version and checksum.
cmake/Jemalloc.cmake	Resolves, builds, and exposes jemalloc.

Review details

Suppressed comments (2)

cmake/Jemalloc.cmake:42

• The external macOS build receives only -O2 -fPIC (plus SDKROOT), so it does not inherit CMAKE_OSX_ARCHITECTURES. On an Apple Silicon host configured with -DCMAKE_OSX_ARCHITECTURES=x86_64 or a universal list, the normal CMake objects use the requested architecture(s) but jemalloc is compiled for the host default, producing an incompatible libjemalloc_pic.a at link; CMAKE_CROSSCOMPILING does not cover this Darwin architecture selection. Pass the selected -arch flags (and matching deployment target) to this command, or explicitly reject such configurations.

set(_jemalloc_env "CC=${CMAKE_C_COMPILER}" "AR=${CMAKE_AR}" "CFLAGS=${_jemalloc_cflags}")
if(APPLE AND CMAKE_OSX_SYSROOT)
  list(APPEND _jemalloc_env "SDKROOT=${CMAKE_OSX_SYSROOT}")

cmake/Jemalloc.cmake:62

• This replacement is only registered with CMake, but the removed AL8 x86 package is also consumed by the Bazel dependency setup. Bazel still directly requires @seekdb_3rd_headers//:lib/libjemalloc_pic.a for sanity builds and exposes jemalloc_headers; after this profile entry is deleted, an AL8 x86 Bazel sanity build cannot resolve the archive or headers. Keep the package until Bazel is migrated, or add the Cargo-built archive and configured headers to the Bazel repository/link graph.

add_library(seekdb_jemalloc STATIC IMPORTED GLOBAL)
set_target_properties(seekdb_jemalloc PROPERTIES IMPORTED_LOCATION "${JEMALLOC_STATIC_LIBRARY}")
add_dependencies(seekdb_jemalloc seekdb_jemalloc_build)

• Files reviewed: 7/8 changed files
• Comments generated: 2
• Review effort level: Lite

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