CI binary segfaulted on HEVC vaEndPicture even though
/etc/makepkg.conf has OPTIONS=(... !lto ...). Root cause: arch-meson's
wrapper hard-codes `-D b_lto=true` regardless of makepkg.conf, so
the binary still gets cross-function ICF (Identical Code Folding)
under -O2 + LTO.
HEVC is the only codec in the campaign that submits a per-frame chain
of 4 control structs (SPS + PPS + DECODE_PARAMS + SLICE_PARAMS); ICF
finds a near-duplicate per-codec helper across the codec dispatch and
merges them, then the wrong instance's local stack layout is invoked
on the HEVC path → SEGV. The other 4 codecs (H.264, VP8, VP9, MPEG-2)
submit fewer/simpler control structs and tolerate the folding by
accident.
Empirical confirmation from the issue body's binary bisection:
meson build (default debugoptimized) 485 KB HEVC ✓
arch-meson + --buildtype=release 145 KB HEVC ✓
arch-meson + release + -flto 76 KB HEVC SEGV
CI build (this package, 7ac934e-1) 133 KB HEVC SEGV
Fix: append `-Db_lto=false` to the arch-meson invocation.
pkgrel 1 -> 2.
claude-noether