feat: added docker build container and improved build script

yak-kernel/CMakeLists.txt

@@ -1,9 +1,25 @@
 project(yak-kernel)
 
+# Configure global options
 set(CMAKE_SYSROOT "/does-not-exist")
+set(CMAKE_SYSTEM_NAME yak)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(CMAKE_CROSSCOMPILING 1)
 
+if (NOT ${CMAKE_C_COMPILER_ID} STREQUAL "Clang")
+    message(WARNING "Only clang is supported, not ${CMAKE_C_COMPILER_ID}")
+endif ()
+
+# Define global options
 option(USE_LIMINE "Enable support for the limine boot protocol" ON)
 
+# Find builtins
+list(APPEND BUILTINS_SEARCH /usr/lib/clang/15/lib/linux /usr/lib/clang/${CMAKE_C_COMPILER_VERSION}/lib/linux /usr/lib/clang/15.*.*/lib/linux)
+find_library(BUILTINS_LIB
+        libclang_rt.builtins-x86_64.a
+        PATHS ${BUILTINS_SEARCH})
+
+# Set compiler options
 add_compile_options(
         -ffreestanding
         -fno-lto
@@ -25,6 +41,7 @@ add_link_options(
         -T ${CMAKE_CURRENT_SOURCE_DIR}/linker.lds
 )
 
+# add printf library for complete printf functionality
 FetchContent_Declare(printf_library
         GIT_REPOSITORY https://github.com/eyalroz/printf.git
         GIT_TAG v6.1.0)
@@ -34,10 +51,12 @@ if (NOT printf_library_POPULATED)
 endif ()
 
 
+# Validate options
 if (NOT ${USE_LIMINE})
     message(FATAL_ERROR "At least one boot protocol is required")
 endif ()
 
+# Find sources
 file(GLOB KERNEL_SOURCES src/rt/*.c src/ulibc/*.c)
 file(GLOB PLATFORM_GENERIC_SOURCES src/platform/generic/*.c)
 
@@ -50,8 +69,10 @@ endif ()
 
 file(GLOB PLATFORM_SPECIFIC_SOURCES src/platform/x86_64/*.c)
 
+# Define aggregate sources
 set(KERNEL_SOURCE_FILES ${KERNEL_SOURCES} ${LIMINE_KERNEL_SOURCES} ${PLATFORM_GENERIC_SOURCES} ${PLATFORM_SPECIFIC_SOURCES})
 
+# Define executable
 add_executable(yak.elf ${KERNEL_SOURCE_FILES})
-target_link_libraries(yak.elf PRIVATE /usr/lib/clang/15.0.7/lib/linux/libclang_rt.builtins-x86_64.a)
+target_link_libraries(yak.elf PRIVATE ${BUILTINS_LIB})
 target_include_directories(yak.elf PRIVATE include ../limine/include ${printf_library_SOURCE_DIR}/src)# ${printf_library_SOURCE_DIR}/src)