Is there a way to compare files using cmake?
I've checked all parameters from https://cmake.org/cmake/help/latest/command/file.html
cmake executable has a tool mode, when it performs some useful actions instead of project's configuration. And compare_files is one of the commands for that mode.
For get features of the CMake command line tool mode in the CMakeLists.txt, use execute_process command:
execute_process( COMMAND ${CMAKE_COMMAND} -E compare_files <file1> <file2>
RESULT_VARIABLE compare_result
)
if( compare_result EQUAL 0)
message("The files are identical.")
elseif( compare_result EQUAL 1)
message("The files are different.")
else()
message("Error while comparing the files.")
endif()
Related
I have the following CMake snippet that runs COMMAND in WORKING_DIRECTORY. I tried different ways to pass the environment variable (MBEDTLS_INCLUDE_DIR=${CMAKE_CURRENT_SOURCE_DIR}/../mbedtls/mbedtls/include) but without success.
The snippet that works (without env variable):
set(BUILD_CMD cargo build --features parsec-client/no-fs-permission-check)
set(WORKING_DIR "${CMAKE_CURRENT_SOURCE_DIR}/parsec_se_driver")
execute_process( COMMAND ${BUILD_CMD}
RESULT_VARIABLE CMD_ERROR
WORKING_DIRECTORY ${WORKING_DIR} )
if(NOT ${CMD_ERROR} MATCHES "0")
MESSAGE(SEND_ERROR "BUILD_CMD STATUS:" ${CMD_ERROR})
endif()
How can I pass the env variable to the execute_process?
If I write something like this:
execute_process( COMMAND MBEDTLS_INCLUDE_DIR=${CMAKE_CURRENT_SOURCE_DIR}/../mbedtls/mbedtls/include cargo build --features parsec-client/no-fs-permission-check
RESULT_VARIABLE CMD_ERROR
WORKING_DIRECTORY ${WORKING_DIR} )
or taking different parts to variables, or adding quotes, I get:
BUILD_CMD STATUS:No such file or directory
As recommended in the CMake mailing list here, your solution using set(ENV ...) is perfectly valid:
set(ENV{MBEDTLS_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/../mbedtls/mbedtls/include)
execute_process(
COMMAND ${BUILD_CMD}
RESULT_VARIABLE CMD_ERROR
WORKING_DIRECTORY ${WORKING_DIR}
)
You could also use CMake's command line utility to run the command in a modified environment using cmake -E env:
execute_process(
COMMAND ${CMAKE_COMMAND} -E env
MBEDTLS_INCLUDE_DIR="${CMAKE_CURRENT_SOURCE_DIR}/../mbedtls/mbedtls/include" ${BUILD_CMD}
RESULT_VARIABLE CMD_ERROR
WORKING_DIRECTORY ${WORKING_DIR}
)
I am trying to copy dll files from my bin folder to a different folder. I want to copy files from bin/Debug when building in Debug and from bin/Release when building in Release. This is what I currently use (and which does not work).
file(GLOB library_files_debug ${outputdirectory_root}/Debug/*.dll)
file(GLOB library_files_release ${outputdirectory_root}/Release/*.dll)
add_custom_target(copy_dlls_to_wheel ALL
DEPENDS setup.py
COMMAND ${CMAKE_COMMAND} -E echo "Debug files: $<$<CONFIG:Debug>:${library_files_debug}>"
COMMAND ${CMAKE_COMMAND} -E echo "Release files: $<$<CONFIG:Release>:${library_files_release}>"
COMMAND ${CMAKE_COMMAND} -E echo "Destination dir: ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}"
COMMAND ${CMAKE_COMMAND} -E copy $<$<CONFIG:Debug>:${library_files_debug}> $<$<CONFIG:Release>:${library_files_release}> ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}
)
I am running on Windows 10, and use Visual Studio to build. When the above target copy_dlls_to_wheel is built in Debug, the first echo statement prints out the correct dll files, and the second echo is empty. However, no files are copied. Instead I get the error message The system cannot find the path specified.
I have also tried to replace the last line with
COMMAND ${CMAKE_COMMAND} -E copy $<$<CONFIG:Debug>:${library_files_debug}> ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}
, but I get the same result.
However, when I remove the generator expression, and use
COMMAND ${CMAKE_COMMAND} -E copy ${library_files_debug} ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}
the files are copied correctly to my output folder. I am pretty confident my generator expression is correct, since I get the expected output from the echo commands. Are generator expressions not supported when using cmake -E copy, or is there something else I am doing wrong?
CMake's command line copy is able to process multiple files when you simply provide a list, which is why this works:
COMMAND ${CMAKE_COMMAND} -E copy ${library_files_debug} ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}
This is expanded to a space-separated list of files when the copy command is ultimately executed, which is the expected syntax.
cmake.exe -E copy mylib1.dll mylib2.dll /your/binary/dir/python/proj
However, when wrapped in a generator expression, the list will not be interpreted correctly by CMake. While the generator expression will be evaluated correctly, the list will be kept as a semicolon-separated list of files, which is the incorrect syntax:
cmake.exe -E copy "mylib1.dll;mylib2.dll" /your/binary/dir/python/proj
This causes the copy command to fail.
To work-around this issue, you could loop over each DLL file you want to copy, if there aren't too many. Something like this could work:
# Loop through the Debug files.
foreach(cur_file ${library_files_debug})
get_filename_component(file_name ${cur_file} NAME)
add_custom_target(copy_dlls_to_wheel_debug_${file_name} ALL
DEPENDS setup.py
COMMAND ${CMAKE_COMMAND} -E echo "DLL file: ${cur_file}"
COMMAND ${CMAKE_COMMAND} -E echo "Destination dir: ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}"
COMMAND ${CMAKE_COMMAND} -E copy $<$<CONFIG:Debug>:${cur_file}> ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}
)
endforeach()
# Loop through the Release files.
foreach(cur_file ${library_files_release})
get_filename_component(file_name ${cur_file} NAME)
add_custom_target(copy_dlls_to_wheel_release_${file_name} ALL
DEPENDS setup.py
COMMAND ${CMAKE_COMMAND} -E echo "DLL file: ${cur_file}"
COMMAND ${CMAKE_COMMAND} -E echo "Destination dir: ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}"
COMMAND ${CMAKE_COMMAND} -E copy $<$<CONFIG:Release>:${cur_file}> ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME}
)
endforeach()
A quicker solution might be to bundle up your DLLs, using CMake's tar command line utility, copy them, then extract them, as suggested in this answer. CMake's tar command does not seem to accept lists wrapped in generator expressions either, so the list of files to bundle together is written to a file.
file(GLOB library_files_debug ${outputdirectory_root}/Debug/*.dll)
file(GLOB library_files_release ${outputdirectory_root}/Release/*.dll)
# Write the filenames (not full path) of the files to pack to file
set(debug_content "")
set(release_content "")
foreach(lib_file ${library_files_debug})
get_filename_component(file_name ${lib_file} NAME)
set(debug_content "${debug_content}${file_name}\n")
endforeach(lib_file ${library_files_debug})
foreach(lib_file ${library_files_release})
get_filename_component(file_name ${lib_file} NAME)
set(release_content "${release_content}${file_name}\n")
endforeach(lib_file ${library_files_release})
set(filenames_debug ${outputdirectory_root}/debug_files.txt)
set(filenames_release ${outputdirectory_root}/release_files.txt)
file(WRITE ${filenames_debug} ${debug_content})
file(WRITE ${filenames_release} ${release_content})
# Read either the list of debug or release files, and pack files
add_custom_command(
TARGET bdist PRE_BUILD
COMMAND ${CMAKE_COMMAND} -E tar "cfj" ${outputdirectory_root}/temp.tar --files-from="$<IF:$<CONFIG:Debug>,${filenames_debug},${filenames_release}>"
WORKING_DIRECTORY ${outputdirectory_root}/$<CONFIG>)
# Unpack the files in the folder building the python wheel
add_custom_command(
TARGET bdist PRE_BUILD
COMMAND ${CMAKE_COMMAND} -E rename ${outputdirectory_root}/temp.tar temp.tar
COMMAND ${CMAKE_COMMAND} -E tar "xfj" temp.tar
COMMAND ${CMAKE_COMMAND} -E remove temp.tar
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/python/${PROJECT_NAME})
Suppose I have a custom target in CMake for unit tests like the below
add_custom_target(
test
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/ATest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/BTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/CTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/DTest)
but I want to add an additional test to the target based on whether an external dependency is found. Currently, I did it with
if(EXTERNAL_FOUND)
add_custom_target(
test
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/ATest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/BTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/CTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/DTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/ETest)
else()
add_custom_target(
test
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/ATest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/BTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/CTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/DTest)
endif()
This is not very elegant and it quickly becomes unmanageable when there are multiple conditions. Is there something like append to custom target so we can write the below instead?
add_custom_target(
test
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/ATest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/BTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/CTest
COMMAND ${CMAKE_CURRENT_BINARY_DIR}/DTest)
if(EXTERNAL_FOUND)
# I can't seem to find something like this
append_custom_target(test COMMAND ${CMAKE_CURRENT_BINARY_DIR}/ETest)
else()
Or is there a better way to do this?
You can use add_custom_command and use it as dependency to your target. With the custom command you can APPEND commands with same OUTPUT:
add_custom_target(
test
DEPENDS test-cmd
)
add_custom_command(
OUTPUT test-cmd
COMMAND ${CMAKE_COMMAND} -E echo "ATest"
COMMAND ${CMAKE_COMMAND} -E echo "BTest"
COMMAND ${CMAKE_COMMAND} -E echo "CTest"
COMMAND ${CMAKE_COMMAND} -E echo "DTest"
)
if(EXTERNAL_FOUND)
add_custom_command(
OUTPUT test-cmd APPEND
COMMAND ${CMAKE_COMMAND} -E echo "ETest"
)
endif()
# test-cmd is not actually generated so set it to symbolic
set_source_files_properties(test-cmd PROPERTIES SYMBOLIC "true")
See SYMBOLIC for the artifical source file property.
I'm using a CMakeLists.txt file to generate (among others) some tests. Therefore I have something like
ENABLE_TESTING()
ADD_TEST(NAME my_name COMMAND my_command)
I'd like to add somme commands after the test is run. I found ADD_CUSTOM_COMMAND which seems to do exactly what I need but unfortunately it doesn't work.
Here is what I have tried
ADD_CUSTOM_COMMAND(
TARGET my_name
POST_BUILD
COMMAND my_other_command
)
It seems that I'm not using the right TARGET.
Could you help me by telling me what I'm supposed to do?
Many thanks in advance,
My goal was to execute a diff command after the test execution finished. This is very similar to the problem you are facing. I used this cmake script technique. Leaving it as an answer in case it helps someone else.
In the original CMakeLists.txt file I added a test
add_test(NAME testCommand
COMMAND ${CMAKE_COMMAND}
-DCMD1=$<TARGET_FILE:target>
-DTEST_DATA_DIR=${CMAKE_SOURCE_DIR}
-P ${CMAKE_SOURCE_DIR}/runtests.cmake)
Create a file called runtests.cmake in the directory which has the CMakeLists.txt file. This new file will hold the commands to execute the test and run commands after
include(FindUnixCommands)
macro(EXEC_CHECK CMD)
execute_process(COMMAND ${CMD} ${TEST_DATA_DIR}/test_input.txt RESULT_VARIABLE CMD_RESULT)
if(CMD_RESULT)
message(FATAL_ERROR "Error running ${CMD}")
else()
if (BASH)
execute_process(COMMAND ${BASH} -c "diff -b ${TEST_DATA_DIR}/test_input.txt ${TEST_DATA_DIR}/test_output.txt" RESULT_VARIABLE RES)
if(RES)
message(FATAL_ERROR "Diff is not clean")
endif()
else(BASH)
message(FATAL_ERROR "BASH not found : no diff script run")
endif(BASH)
endif()
endmacro()
exec_check(${CMD1})
From the build directory I can now issue make test and it picks up the cmake script properly.
I have a header only library, that I include in my project using ExternalProject_Add. The install command should just copy a folder. Since this should work on Windows and Linux, I tried to use file(COPY ...).
INSTALL_COMMAND "file(COPY ../src/include DESTINATION ../install/include)"
This gives an error since INSTALL_COMMAND gets executed as shell command. How can I use a CMake macro instead?
CMake has a "command mode", i.e. cmake -E ... which provides some cross-platform filesystem commands. To see all -E options, just run cmake -E.
To invoke CMake itself from within a CMakeLists.txt file, you can use the variable CMAKE_COMMAND:
INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory ../src/include ../install/include