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build: libavr rides as the pinned submodule

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The submodule replaces FetchContent and the unpinned forge fallback;
LIBAVR_ROOT stays as the tandem-development override, the presets take the
toolchain file from the submodule, and the Studio project's include path
anchors there — correct by construction.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-07-28 00:29:38 +02:00
parent 2cdf56f8d6
commit 5afe29359c
6 changed files with 28 additions and 22 deletions
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17
CMakeLists.txt
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@@ -2,18 +2,19 @@ cmake_minimum_required(VERSION 3.28)
project(fantemp LANGUAGES CXX)
# libavr from a local checkout (LIBAVR_ROOT) or the forge; the toolchain
# file comes from the same checkout via CMakePresets.json.
include(FetchContent)
# libavr rides as the pinned submodule; LIBAVR_ROOT (cache or environment)
# overrides it for tandem development against a working tree. The toolchain
# file comes from the submodule via CMakePresets.json either way.
if(NOT LIBAVR_ROOT AND DEFINED ENV{LIBAVR_ROOT})
set(LIBAVR_ROOT $ENV{LIBAVR_ROOT})
endif()
if(LIBAVR_ROOT)
FetchContent_Declare(libavr SOURCE_DIR ${LIBAVR_ROOT})
else()
FetchContent_Declare(libavr GIT_REPOSITORY git@git.blackmark.me:avr/libavr.git GIT_TAG main)
if(NOT LIBAVR_ROOT)
set(LIBAVR_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/libavr)
endif()
FetchContent_MakeAvailable(libavr)
if(NOT EXISTS ${LIBAVR_ROOT}/CMakeLists.txt)
message(FATAL_ERROR "libavr not found at ${LIBAVR_ROOT} — run: git submodule update --init libavr")
endif()
add_subdirectory(${LIBAVR_ROOT} libavr-build)
add_executable(fantemp src/main.cpp)
target_link_libraries(fantemp PRIVATE libavr)