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, 29 insertions, 0 deletions

diff --git a/cmake/dependencies/irmd/libtoml.cmake b/cmake/dependencies/irmd/libtoml.cmake
new file mode 100644
index 00000000..dcbc17e4
--- /dev/null
+++ b/cmake/dependencies/irmd/libtoml.cmake
@@ -0,0 +1,29 @@
+find_library(LIBTOML_LIBRARY toml QUIET)
+if(LIBTOML_LIBRARY)
+  find_path(LIBTOML_INCLUDE_DIR toml.h)
+  set(DISABLE_CONFIGFILE FALSE CACHE BOOL
+    "Disable configuration file support")
+  if(NOT DISABLE_CONFIGFILE)
+    set(OUROBOROS_CONFIG_FILE irmd.conf CACHE STRING
+      "Name of the IRMd configuration file")
+    set(HAVE_TOML TRUE CACHE INTERNAL "TOML configuration file support available")
+    message(STATUS "Configuration file support enabled")
+    message(STATUS "Configuration directory: ${OUROBOROS_CONFIG_DIR}")
+    # Create imported target for consistency with other dependencies
+    if(NOT TARGET toml::toml)
+      add_library(toml::toml UNKNOWN IMPORTED)
+      set_target_properties(toml::toml PROPERTIES
+        IMPORTED_LOCATION "${LIBTOML_LIBRARY}"
+        INTERFACE_INCLUDE_DIRECTORIES "${LIBTOML_INCLUDE_DIR}")
+    endif()
+  else()
+    message(STATUS "Configuration file support disabled by user")
+    unset(OUROBOROS_CONFIG_FILE CACHE)
+    unset(HAVE_TOML CACHE)
+  endif()
+  mark_as_advanced(LIBTOML_LIBRARY LIBTOML_INCLUDE_DIR)
+else()
+  message(STATUS "Install tomlc99 for config file support")
+  message(STATUS "     https://github.com/cktan/tomlc99")
+  unset(HAVE_TOML CACHE)
+endif()