How can I redirect the output of the CMake “execute_process” command to STDOUT in real-time?












1















I am working on a project that needs to execute a system process from a CMake script that may take a while to run. The problem is the entire time the process is running I get no feedback about whether it is succeeding or not. Since the process may take a few minutes to run it may appear as though it froze even though it is still silently working.



At the end of the process I can get the output in a CMake variable and print all of the things that happened during that time:



execute_process(COMMAND some system command

    OUTPUT_VARIABLE command_output

)



# ... nothing happens for a few minutes while the process executes



# All of the output from the past few minutes is printed all at once.

message(STATUS ${command_output})


It would be much nicer if I could just redirect the process output directly to STDOUT so I could see output of the process while it is executing... Is there any way to do this?






cmake io system stdout io-redirection







share|improve this question























  • Simple execute_process(COMMAND some system command) without additional options will use standard output and error streams. Have you tried that?

    – Tsyvarev
    Nov 16 '18 at 7:56
















1















I am working on a project that needs to execute a system process from a CMake script that may take a while to run. The problem is the entire time the process is running I get no feedback about whether it is succeeding or not. Since the process may take a few minutes to run it may appear as though it froze even though it is still silently working.



At the end of the process I can get the output in a CMake variable and print all of the things that happened during that time:



execute_process(COMMAND some system command

    OUTPUT_VARIABLE command_output

)



# ... nothing happens for a few minutes while the process executes



# All of the output from the past few minutes is printed all at once.

message(STATUS ${command_output})


It would be much nicer if I could just redirect the process output directly to STDOUT so I could see output of the process while it is executing... Is there any way to do this?






cmake io system stdout io-redirection







share|improve this question























  • Simple execute_process(COMMAND some system command) without additional options will use standard output and error streams. Have you tried that?

    – Tsyvarev
    Nov 16 '18 at 7:56














1












1








1








I am working on a project that needs to execute a system process from a CMake script that may take a while to run. The problem is the entire time the process is running I get no feedback about whether it is succeeding or not. Since the process may take a few minutes to run it may appear as though it froze even though it is still silently working.



At the end of the process I can get the output in a CMake variable and print all of the things that happened during that time:



execute_process(COMMAND some system command

    OUTPUT_VARIABLE command_output

)



# ... nothing happens for a few minutes while the process executes



# All of the output from the past few minutes is printed all at once.

message(STATUS ${command_output})


It would be much nicer if I could just redirect the process output directly to STDOUT so I could see output of the process while it is executing... Is there any way to do this?






cmake io system stdout io-redirection







share|improve this question














I am working on a project that needs to execute a system process from a CMake script that may take a while to run. The problem is the entire time the process is running I get no feedback about whether it is succeeding or not. Since the process may take a few minutes to run it may appear as though it froze even though it is still silently working.



At the end of the process I can get the output in a CMake variable and print all of the things that happened during that time:



execute_process(COMMAND some system command

    OUTPUT_VARIABLE command_output

)



# ... nothing happens for a few minutes while the process executes



# All of the output from the past few minutes is printed all at once.

message(STATUS ${command_output})


It would be much nicer if I could just redirect the process output directly to STDOUT so I could see output of the process while it is executing... Is there any way to do this?






cmake io system stdout io-redirection




cmake io system stdout io-redirection






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 16 '18 at 3:25









tjwrona1992tjwrona1992

3,92421647




3,92421647













  • Simple execute_process(COMMAND some system command) without additional options will use standard output and error streams. Have you tried that?

    – Tsyvarev
    Nov 16 '18 at 7:56



















  • Simple execute_process(COMMAND some system command) without additional options will use standard output and error streams. Have you tried that?

    – Tsyvarev
    Nov 16 '18 at 7:56

















Simple execute_process(COMMAND some system command) without additional options will use standard output and error streams. Have you tried that?

– Tsyvarev
Nov 16 '18 at 7:56





Simple execute_process(COMMAND some system command) without additional options will use standard output and error streams. Have you tried that?

– Tsyvarev
Nov 16 '18 at 7:56












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