Batocera builds RetroArch with its core downloader (configure defaults,
qb/config.params.sh:149-150), shown in the menu since it is no Lakka
build (config.def.h:743-745), and configgen sets no URL, so the compiled
one applies: buildbot linux/x86_64 or linux/armhf, none on aarch64
(config.def.h:1855-1861). The targets scraper names that list per board
(downloads, an armv7-A CPU read from arch/Config.in.arm), the builder
and the published target lists add it, and the platform names the union
as installable_cores. applewin, gong, squirreljme and vemulator come
back that way. A build option that compiles the downloader out, or a
shipped retroarch.cfg that blanks its URL, turns it off.
No Batocera board turns on BATOCERA_CORES_STILL_COMMERCIALIZED or
BATOCERA_CORES_EXPERIMENTAL (Config.in:109, 1670), so citron, ryujinx,
applewin and eka2l1 are not built, and freej2me, gong, squirreljme, uqm
and vemulator are selected by no Kconfig file at batocera-43.1. Read
with every sourced Kconfig file, the Pi 4 boards gain dxx-rebirth,
sonic2013, soniccd and xroar (mesa3d-rpi4 gives them OpenGL).
Batocera and KNULLI write the image name, not the board, to the card's board file (post-image-script.sh). The target scraper now records each board's images from Config.in, the target lists carry them, and the installer maps a card's image to its board. KNULLI's boot/knulli.board is read too.
Continued if-conditions were cut at their first line, so GLES3 held on every board, and selects guarded by a negation stayed on once fired. Derived flags are read line by line, each pass rebuilds the symbol set from the board, and the architecture comes from the board's BR2_<arch> choice.
The target scraper treated every select in Config.in as unconditional
and never set the symbols Buildroot sets, so nearly every board listed
the same 171 cores and xroar, which needs OpenGL, reached none. Selects
now fire from their own config, to a fixed point, from the flags each
board file sets, with Buildroot's arch and OpenGL provider rules read at
the commit Batocera pins. A board that builds no image is no target.
Batocera's cores were read from configgen-defaults.yml, one per system,
and a hand-kept registry list overrode even that; DOSBox Staging,
melonDS DS and nine other cores a user can pick in ES were outside the
pack, while mamemess, which Batocera does not ship, was in. The
scraper now reads es_systems.yml, the registry list is gone, and the
target scraper names standalone emulators (amiberry, fsuae, vice)
instead of only the machines listed under them.
Abdessamad Derraz