build: update to support building under a hosted cross-compiler

libmagenta/CMakeLists.txt

@@ -1,4 +1,9 @@
-file(GLOB headers ${CMAKE_CURRENT_SOURCE_DIR}/include/magenta/*.h)
+cmake_minimum_required(VERSION 3.31)
+project(libmagenta C ASM)
+
+file(GLOB headers
+	${CMAKE_CURRENT_SOURCE_DIR}/include/magenta/*.h
+	${CMAKE_CURRENT_SOURCE_DIR}/include-user/magenta/*.h)
 file(GLOB asm_sources
 	${CMAKE_CURRENT_SOURCE_DIR}/arch/${CMAKE_SYSTEM_PROCESSOR}/*.S)
 
@@ -6,7 +11,14 @@ set(public_include_dirs
 	${CMAKE_CURRENT_SOURCE_DIR}/include
 	${CMAKE_CURRENT_SOURCE_DIR}/include-user)
 
-add_library(libmagenta STATIC ${asm_sources})
+add_library(libmagenta STATIC ${asm_sources} ${headers})
 target_include_directories(libmagenta PUBLIC
 	${CMAKE_CURRENT_SOURCE_DIR}/include
 	${CMAKE_CURRENT_SOURCE_DIR}/include-user)
+target_compile_options(libmagenta PRIVATE -ffreestanding -nostdlib)
+
+set_target_properties(libmagenta PROPERTIES
+	PREFIX "")
+
+install(TARGETS libmagenta)
+install(FILES ${headers} DESTINATION include/magenta)