v1 has no libfftw3. SAE_SCENE_XGB is on by default and pulls the learned
scene-boundary detector into result_sink, whose find_library(FFTW3_LIB
fftw3 REQUIRED) at CMakeLists.txt:377 runs at CONFIGURE time -- so cmake
fails before any target is chosen, and building only `sae_tests` does not
get you past it. The image predates the detector; nothing rebuilt it when
the detector landed, which is precisely the gap DP-007's own register row
records.
-DSAE_SCENE_XGB=OFF would also have made the configure pass. It is the
wrong fix and worth saying why: CI is the only place these tests run, so
a flag that silences a subsystem there silences it everywhere, and the
job would have gone green over a detector nobody was compiling.
The image's self-check gains a line, because an image that ships a
library CMake cannot find the way CMake looks for it is the failure this
block exists to catch. FFTW is checked as a bare .so rather than through
pkg-config, since find_library is what CMakeLists.txt actually calls --
checking fftw3.pc would pass on an image whose libfftw3.so was absent.
Tag bumped v1 -> v2 here, in build_builder_image.sh and in the workflow's
run-time assert, in one commit, as this image's contract requires. v2 is
built and published. Rehearsed in the image before pinning it: configure,
build and 151 tests now run.
TRACES: DP-007 | PR-004
dtourolle
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