fix(jolt): disable IPO so libJolt.a links on Linux/GCC (#44)#47
Merged
proggeramlug merged 1 commit intomainfrom May 1, 2026
Merged
fix(jolt): disable IPO so libJolt.a links on Linux/GCC (#44)#47proggeramlug merged 1 commit intomainfrom
proggeramlug merged 1 commit intomainfrom
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Rust's link step routes through rust-lld on Linux, which doesn't load gcc's lto-wrapper plugin. With INTERPROCEDURAL_OPTIMIZATION=ON, libJolt.a archive members are GIMPLE bitcode and rust-lld leaves their implementations unresolved — JPH::Free, BodyManager locks, vtables, etc all come up undefined. macOS Apple Clang handles LTO archives transparently which is why macOS was unaffected. Also fix the Jolt option name typo: PROFILE_ENABLED is not a Jolt CMake option (Jolt expects PROFILER_IN_DEBUG_AND_RELEASE / PROFILER_IN_DISTRIBUTION), so the comment claiming "no profile" was a no-op and Jolt was actually being built with the profiler enabled. Same for DEBUG_RENDERER_IN_DISTRIBUTION, now explicitly forced off.
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Summary
INTERPROCEDURAL_OPTIMIZATIONinbloom_jolt's CMake config. Rust's link step on Linux routes through rust-lld which doesn't load gcc's lto-wrapper plugin, solibJolt.a's GIMPLE-bytecode archive members leaveJPH::Free, BodyManager locks, vtables, etc unresolved at the final link.PROFILE_ENABLEDis not a real Jolt CMake variable. Jolt's actual options arePROFILER_IN_DEBUG_AND_RELEASEandPROFILER_IN_DISTRIBUTION. The previous setting was a no-op, so Jolt was being built with the profiler ON despite the "no profile" intent. Same cleanup applied toDEBUG_RENDERER_IN_DISTRIBUTION.Why Linux only
macOS Apple Clang produces LTO archives that Apple's linker handles transparently — that's why local macOS builds and the macOS CI job pass. The failure mode is specific to GCC's GIMPLE bitcode + a non-GCC-driven linker, which is exactly what the Rust toolchain does on Ubuntu.
Closes #44.
Test plan
cargo test --releaseinnative/shared/still green on macOS (66 passed locally)shared-tests (ubuntu-22.04)job goes greenshared-tests (windows-latest)job stays greenbuild-linuxjob goes green