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CMake sets directories for objects files implicitly while compiling the source files, but I want to keep all those object files in a particular directory.

For example in my code CMake is creating directories based on the source code directories itself like this:

CMakeFiles/OBJ2.dir/src/lib/kernels/XnnKernel.o

I want to keep them in different locations, but unable to do so.

I tried some commands:

set(OBJ "build/CMakeFiles/OBJ1.dir/src/lib/kernels/igemm8_generic.o") file(COPY ${OBJ} DESTINATION ${SOURCE_PATH}/src/OBJ_FILES)

As per my understanding, the file(COPY) command is getting executed before compilation. Please correct me if I am wrong and give me a solution.

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1 Answer 1

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You could use a combination of generator expressions with a custom command. The basic functionality is based on the CMake capability of creating object libraries.

project structure:

. ├── CMakeLists.txt └── src └── foo.c

sample CMakeLists.txt:

cmake_minimum_required(VERSION 3.11) project(foo C) set(SOURCES "src/foo.c") set(LIBNAME "foo") set(LIBNAME_OBJ "${LIBNAME}_obj") add_library(${LIBNAME_OBJ} OBJECT ${SOURCES}) target_include_directories(${LIBNAME_OBJ} PUBLIC "include") target_compile_options(${LIBNAME_OBJ} PUBLIC "-fPIC") add_library(${LIBNAME} SHARED $<TARGET_OBJECTS:${LIBNAME_OBJ}>) set(OBJ_DIR ${CMAKE_CURRENT_BINARY_DIR}/obj_dir) add_custom_command(TARGET ${LIBNAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E make_directory ${OBJ_DIR} COMMAND ${CMAKE_COMMAND} -E copy_if_different $<TARGET_OBJECTS:${LIBNAME_OBJ}> ${OBJ_DIR})

The file command does not support generator expressions with filesystem operations.

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