build: Refactor CMake back to in-tree CMakeListsbe

This moves the build definitions back to src/ subdirectories
(CMakeLists.txt per component). Configuration and dependencies are
kept out of tree. Configuration options are bundled into cmake/config/
modules. Dependencies are grouped by component (system/, crypt/, eth/,
coverage/, etc.). It now consistently uses target-based commands
(target_include_directories, target_link_libraries) instead of global
include_directories(). Proper PRIVATE/PUBLIC visibility for executable
link libraries. CONFIG_OUROBOROS_DEBUG now properly set based on being
a valid debug config (not just checking the string name).

It also adds OuroborosTargets export for find_package() support and
CMake package config files (OuroborosConfig.cmake) for easier
integration with CMake projects.

The build logic now follows more idiomatic CMake practices with
configuration separated from target definitions.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/ipcpd/eth/CMakeLists.txt b/src/ipcpd/eth/CMakeLists.txt
new file mode 100644
index 00000000..e6cc8224
--- /dev/null
+++ b/src/ipcpd/eth/CMakeLists.txt
@@ -0,0 +1,24 @@
+# Ethernet IPCPs build configuration (LLC and DIX)
+# HAVE_ETH detection is in cmake/dependencies.cmake
+
+set(IPCP_ETH_LLC_TARGET ipcpd-eth-llc)
+set(IPCP_ETH_DIX_TARGET ipcpd-eth-dix)
+
+add_executable(${IPCP_ETH_LLC_TARGET} llc.c ${IPCP_SOURCES})
+add_executable(${IPCP_ETH_DIX_TARGET} dix.c ${IPCP_SOURCES})
+
+foreach(target ${IPCP_ETH_LLC_TARGET} ${IPCP_ETH_DIX_TARGET})
+  target_include_directories(${target} PRIVATE ${IPCP_INCLUDE_DIRS})
+  if(HAVE_BPF AND NOT APPLE)
+    target_include_directories(${target} PRIVATE ${BPF_C_INCLUDE_DIR})
+  endif()
+  if(HAVE_NETMAP AND NOT APPLE)
+    target_compile_options(${target} PRIVATE -std=c99)
+    target_include_directories(${target} PRIVATE ${NETMAP_C_INCLUDE_DIR})
+  endif()
+  target_link_libraries(${target} PRIVATE ouroboros-dev)
+  ouroboros_target_debug_definitions(${target})
+endforeach()
+
+install(TARGETS ${IPCP_ETH_LLC_TARGET} ${IPCP_ETH_DIX_TARGET}
+        RUNTIME DESTINATION ${CMAKE_INSTALL_SBINDIR})