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How to use --build and --parallel?

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Heng Zhou

How to use --build and --parallel?

Hi,

I want to build a project using all cores of the machine. After cmake .., I have tried

cmake --build --parallel .

and

cmake --build . --parallel

, but none of them works. So, what is the correct usage of --build and --parallel when using them together? I have read the documentation https://cmake.org/cmake/help/latest/manual/cmake.1.html#build-tool-mode but still could not figure out. Thanks for your help.

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Eric Noulard

Re: How to use --build and --parallel?

Le ven. 9 août 2019 à 04:40, Heng Zhou <[hidden email]> a écrit :

Hi,

I want to build a project using all cores of the machine. After cmake .., I have tried

cmake --build --parallel .

and

cmake --build . --parallel

, but none of them works. So, what is the correct usage of --build and --parallel when using them together? I have read the documentation https://cmake.org/cmake/help/latest/manual/cmake.1.html#build-tool-mode but still could not figure out. Thanks for your help.

Try providing a number of parallel job after the --parallel option.

Depending on the native build tool used you won't get automatic number of parallel jobs.

Which CMake generator are you using?

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Eric Noulard

Re: How to use --build and --parallel?

Le ven. 9 août 2019 à 06:44, Heng Zhou <[hidden email]> a écrit :

I am working on ubuntu 16.04, so the generator is the default "Unix Makefiles" which I did not specify. I don't think it is related to the lack of the parallel job number (I added 4 but with the same error). I just wanna confirm whether I wrote the syntax correctly. An example would suffice.

this sequence works for me on Debian 9 and CMake 3.13.2:

cd buildir

cmake -G /path/to/srcdir

cmake --build --parallel .

What kind or error do you get when you do that?

On Fri, Aug 9, 2019 at 12:25 AM Eric Noulard <[hidden email]> wrote:

Le ven. 9 août 2019 à 04:40, Heng Zhou <[hidden email]> a écrit :
Hi,

I want to build a project using all cores of the machine. After cmake .., I have tried

cmake --build --parallel .

and

cmake --build . --parallel

, but none of them works. So, what is the correct usage of --build and --parallel when using them together? I have read the documentation https://cmake.org/cmake/help/latest/manual/cmake.1.html#build-tool-mode but still could not figure out. Thanks for your help.

Try providing a number of parallel job after the --parallel option.
Depending on the native build tool used you won't get automatic number of parallel jobs.
Which CMake generator are you using?
--

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Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ

Kitware offers various services to support the CMake community. For more information on each offering, please visit:

CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
CMake Training Courses: http://cmake.org/cmake/help/training.html

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Follow this link to subscribe/unsubscribe:
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Eric