Use new find module for libserialport

This new find module will replace the old logic used to locate a native
copy of libserialport. THe old code didn't work on macOS, and was pretty
messy.

CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.16)
 set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64" CACHE STRING "" FORCE)
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 project(blisp C)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_C_STANDARD 11)
@@ -42,11 +43,10 @@ set_target_properties(libblisp_static PROPERTIES
         OUTPUT_NAME "blisp")
 
 if(BLISP_USE_SYSTEM_LIBRARIES)
-    find_package(PkgConfig)
+    find_package(Libserialport REQUIRED)
-    pkg_search_module(LIBSERIALPORT REQUIRED libserialport)
+    target_link_libraries(libblisp PUBLIC Libserialport::Libserialport)
-    target_link_libraries(libblisp PUBLIC ${LIBSERIALPORT_LIBRARIES})
+    target_link_libraries(libblisp_static PUBLIC Libserialport::Libserialport)
-    target_link_libraries(libblisp_static PUBLIC ${LIBSERIALPORT_LIBRARIES})
+    target_include_directories(libblisp_obj PUBLIC ${Libserialport_INCLUDE_DIRS})
-    target_include_directories(libblisp_obj PUBLIC ${LIBSERIALPORT_INCLUDE_DIRS})
 else()
 	if(NOT ${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
 	target_sources(libblisp_obj PRIVATE

cmake/FindLibserialport.cmake

@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: MIT
+
+#[=======================================================================[.rst:
+FindLibserialport
+-------
+
+Finds the sigrok serial port library (``libserialport``)
+
+Imported Targets
+^^^^^^^^^^^^^^^^
+
+This module defines the following imported targets, if found:
+
+``Libserialport::Libserialport``
+  The serialport library
+
+Result Variables
+^^^^^^^^^^^^^^^^
+
+This module will define the following variables:
+
+``Libserialport_FOUND``
+  True if the system has the serialport library.
+``Libserialport_VERSION``
+  The version of the serialport library which was found.
+``Libserialport_INCLUDE_DIRS``
+  Include directories needed to use ``libserialport``.
+``Libserialport_LIBRARIES``
+  Libraries needed to link to ``libserialport``.
+
+Cache Variables
+^^^^^^^^^^^^^^^
+
+The following cache variables may also be set:
+
+``Libserialport_INCLUDE_DIR``
+  The directory containing ``libserialport.h``.
+``Libserialport_LIBRARY``
+  The path to the ``libserialport`` library.
+
+#]=======================================================================]
+
+find_package(PkgConfig)
+pkg_check_modules(PC_Libserialport QUIET libserialport)
+
+find_path(Libserialport_INCLUDE_DIR
+    NAMES libserialport.h
+    PATHS "${PC_Libserialport_INCLUDE_DIRS}"
+)
+find_library(Libserialport_LIBRARY
+    NAMES serialport
+    HINTS "${PC_Libserialport_LIBRARY_DIRS}"
+)
+
+set(Foo_VERSION ${PC_Foo_VERSION})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Libserialport
+    FOUND_VAR Libserialport_FOUND
+    REQUIRED_VARS
+        Libserialport_LIBRARY
+        Libserialport_INCLUDE_DIR
+    VERSION_VAR Libserialport_VERSION
+)
+
+if(Libserialport_FOUND)
+    set(Libserialport_LIBRARIES ${Libserialport_LIBRARY})
+    set(Libserialport_INCLUDE_DIRS ${Libserialport_INCLUDE_DIR})
+    set(Libserialport_DEFINITIONS ${PC_Liberialport_CFLAGS_OTHER})
+endif()
+
+if(Libserialport_FOUND AND NOT TARGET Libserialport::Libserialport)
+    add_library(Libserialport::Libserialport UNKNOWN IMPORTED)
+    set_target_properties(Libserialport::Libserialport PROPERTIES
+        IMPORTED_LOCATION "${Libserialport_LIBRARY}"
+        INTERFACE_COMPILE_OPTIONS "${PC_Libserialport_CFLAGS_OTHER}"
+        INTERFACE_INCLUDE_DIRECTORIES "${Libserialport_INCLUDE_DIR}"
+    )
+endif()