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The nightly armv7 sciter build aborts while compiling the final `rustdesk`
binary:
fatal runtime error: Rust cannot catch foreign exceptions
error: could not compile `rustdesk` (bin "rustdesk") (signal: 6, SIGABRT)
armv7 is the only 32-bit target in this job that links the whole binary, and
`[profile.release]` uses fat LTO with codegen-units = 1, so LLVM merges every
module into a single unit and runs past the ~3GB address space a 32-bit
process gets. The allocation failure surfaces as a C++ bad_alloc unwinding
into rustc's Rust frames, which is what that "foreign exceptions" abort is.
The x86_64 sciter build uses the same settings and passes, as do aarch64 and
every other 64-bit job in the same run, so this is specific to the 32-bit
address space rather than to the source change itself.
It started failing once the crate graph grew (hbb_common is pulled with the
`webrtc` feature unconditionally), which pushed an already marginal target
over the limit.
Use thin LTO with more codegen units for armv7 only. Peak memory stays
bounded while cross-crate inlining is kept, and 64-bit targets are untouched.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lq6xFoeEmjcuKwRx1GfdQ2