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This directory contains core submodules and Genode-specific build rules. To port a core to Genode, add a minimal Tupfile to the upsteam repository, add a new directory containing the upstream Git repository here as submodule, then add a Tuprules.tup file in the local directory containg Genode build rules.
The upstream Tupfile should be as simple as possible. It must mirror the core
TARGET_NAME defined in the Libretro makefile, the CORE_DIR if defined by
Make as well, and the include_rules directive.
TARGET_NAME=2048
CORE_DIR=$(TUP_CWD)
include_rules
The local Tuprules.tup file contains the actual build rules. Typically a core
repository contains Makefile and Makefile.common files, the later containing
a list of sources files relative to a CORE_DIR variable, which can usually be
included and parsed by Tup. Note that Tup cannot include files relative to a
variable, Tuprules.tup must include Makefile.common relative to itself.
Please refer to a Tuprules.tup in any of the core directories here as an
example.
Unfortunately not all cores are trivally compatible with Tup, in particular those with makefiles that wrap a pre-Libretro Make build system.