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# compile_asm(TARGET target ASM_FILES file1 [file2 ...] OUTPUT_OBJECTS [variableName])
# CMake does not support the ARM or ARM64 assemblers on Windows when using the
# MSBuild generator. When the MSBuild generator is in use, we manually compile the assembly files
# using this function.
#
# Borrowed from dotnet/runtime, licensed under MIT
# Copyright (c) .NET Foundation and Contributors
# https://github.com/dotnet/runtime/blob/main/eng/native/functions.cmake
function(compile_asm)
set(options "")
set(oneValueArgs TARGET OUTPUT_OBJECTS)
set(multiValueArgs ASM_FILES)
cmake_parse_arguments(COMPILE_ASM "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGV})
get_include_directories_asm(ASM_INCLUDE_DIRECTORIES)
set (ASSEMBLED_OBJECTS "")
foreach(ASM_FILE ${COMPILE_ASM_ASM_FILES})
get_filename_component(name ${ASM_FILE} NAME_WE)
# Produce object file where CMake would store .obj files for an OBJECT library.
# ex: artifacts\obj\coreclr\windows.arm64.Debug\src\vm\wks\cee_wks.dir\Debug\AsmHelpers.obj
set (OBJ_FILE "${CMAKE_CURRENT_BINARY_DIR}/${COMPILE_ASM_TARGET}.dir/${CMAKE_CFG_INTDIR}/${name}.obj")
# Need to compile asm file using custom command as include directories are not provided to asm compiler
add_custom_command(OUTPUT ${OBJ_FILE}
COMMAND "${CMAKE_ASM_COMPILER}" -g ${ASM_INCLUDE_DIRECTORIES} -o ${OBJ_FILE} ${ASM_FILE}
DEPENDS ${ASM_FILE}
COMMENT "Assembling ${ASM_FILE} ---> \"${CMAKE_ASM_COMPILER}\" -g ${ASM_INCLUDE_DIRECTORIES} -o ${OBJ_FILE} ${ASM_FILE}")
# mark obj as source that does not require compile
set_source_files_properties(${OBJ_FILE} PROPERTIES EXTERNAL_OBJECT TRUE)
# Add the generated OBJ in the dependency list so that it gets consumed during linkage
list(APPEND ASSEMBLED_OBJECTS ${OBJ_FILE})
endforeach()
set(${COMPILE_ASM_OUTPUT_OBJECTS} ${ASSEMBLED_OBJECTS} PARENT_SCOPE)
endfunction()
# Build a list of include directories for consumption by the assembler
function(get_include_directories_asm IncludeDirectories)
get_directory_property(dirs INCLUDE_DIRECTORIES)
foreach(dir IN LISTS dirs)
list(APPEND INC_DIRECTORIES -I${dir};)
endforeach()
set(${IncludeDirectories} ${INC_DIRECTORIES} PARENT_SCOPE)
endfunction(get_include_directories_asm)
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