IAR: Fixed #6670

[TTornblom]

Description

This fix implements preprocessing of assembler files similar to the ARM toolchain.

The fix has been tested on the mbed-os-example-blinky example, with the same configuration
changes as described in #6670.

Pull request type

[x] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

[theotherjimmy]

@TTornblom How does this export?

[TTornblom]

As far as I know this is only related to building, not exporting.

It adds an intermediate preprocessor step for assembler files, similar to what is used for the ARM toolchain. Parts of the change was pulled from the arm.py file.

[TTornblom]

I can't check why the continuous-integration/jenkins/pr-head failed as the details appears to be on an internal system. Can anyone provide the details?

[0xc0170]

I can't check why the continuous-integration/jenkins/pr-head failed as the details appears to be on an internal system. Can anyone provide the details?

We will look at this and report back

[0xc0170]

Restarted jenkins CI, failure to report back status to github

[theotherjimmy]

As far as I know this is only related to building, not exporting.

The exporters must mimic what the build system does, so any changes to build system behaviors must come with an exporter update. This changes something in building, so it mush come with a change to exporting to match it.

It adds an intermediate preprocessor step for assembler files, similar to what is used for the ARM toolchain.

If a user were to use this new behavior in mbed compile they would be stumped if it did not work correctly when exporting. Could you update the iar based exporters (IAR and make_iar, last I checked) to implement the same feature?

Edit: tone.

[theotherjimmy]

Please add similar functionality to the IAR based exporters.

[ashok-rao]

@TTornblom , are you OK to address the comments above? Thanks!

[TTornblom]

Will rework this, closing PR

[TTornblom]

Resubmitting. Will also submit a doc PR describing what needs to be done when exporting to IAR Embedded Workbench

[TTornblom]

A new paragraph has been added to https://github.com/TTornblom/Handbook/blob/new_engine/docs/tools/toolchains/export_to_third_party.md to address the issues with exporting to IAR Embedded Workbench

[TTornblom]

Reworking this to fix exporter