Brendan McDonnell

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7 years ago.

C++11 in exported projects

How can I use mbed-cli to set the language standard compiler option (e.g. -std=gnu++11) in my exported project? Is this settable via command line options? And/or via .json files?

Currently I'm using mbed export -m LPC4088 -i mcuxpresso.

If possible, please include an explanation and a link to references, so I can learn more. Thanks.

1 Answer

Jan Jongboom
6 years, 12 months ago.

You can do so using a build profile. Add -std=gnu++11 to your local build profile then export via:

mbed export -m LPC4088 -i mcuxpresso --profile=./path/to/local/profile.json

Accepted Answer

By default, the exported project includes debug and release build configurations. Can I give multiple build profiles to mbed export to have it create multiple build configs in the output project file(s)?

Also, I'm running mbed-cli v1.2.2. mbed export -h gives no indication of a --profile option. Is it missing from the help text?

$ mbed export -h
usage: mbed export [-h] [-i IDE] [-m TARGET] [--source SOURCE] [-c]
                   [-S [{matrix,ides}]] [--app-config APP_CONFIG] [-v] [-vv]

Generate IDE project files for the current program.

optional arguments:
  -h, --help            show this help message and exit
  -i IDE, --ide IDE     IDE to create project files for. Example: UVISION4,
                        UVISION5, GCC_ARM, IAR, COIDE
  -m TARGET, --target TARGET
                        Export for target MCU. Example: K64F, NUCLEO_F401RE,
                        NRF51822...
  --source SOURCE       Source directory. Default: . (current dir)
  -c, --clean           Clean the build directory before compiling
  -S [{matrix,ides}], --supported [{matrix,ides}]
                        Shows supported matrix of targets and toolchains
  --app-config APP_CONFIG
                        Path of an app configuration file (Default is to look
                        for 'mbed_app.json')
  -v, --verbose         Verbose diagnostic output
  -vv, --very_verbose   Very verbose diagnostic output
posted by Brendan McDonnell 20 Dec 2017

Not sure how it works exactly for LPCXpresso. Are you sure DEBUG and RELEASE actually create different builds? You can only export one profile at a time, and yes, apparently the docs are missing. Default profile is debug. How I do it for Makefiles is that I export with different profiles and just rename Makefile to Makefile-debug / Makefile-release, and go from there. But no experience with Xpresso.

Probably you can also configure the IDE to build with Mbed CLI by setting the build command. Then you can just include the --profile switch in the build command, and call a different one when creating a release build.

posted by Jan Jongboom 20 Dec 2017

Quote:

You can only export one profile at a time

I posted an issue here: https://github.com/ARMmbed/mbed-cli/issues/588

Thanks.

posted by Brendan McDonnell 20 Dec 2017

I may have spoken too soon.

https://os.mbed.com/forum/mbed/topic/28583/

posted by Brendan McDonnell 18 Jan 2018