Simplify and Improve error/warning parser for gcc_arm

[DBS06]

Description

Simplify parsing of error and warning messages for GCC_ARM.

First, the parsing method is a little bit confusing and hacky and sometimes the column parsing by calculating the ^ position fails and on the output it shows "0" instead of the correct warning/error column. Instead I am parsing the column out of the gcc_arm output.
Second, the regex for the "INDEX_PATTERN" is not necessary anymore.

Status

READY

Migrations

NO

Steps to test or reproduce

mbed compile -t GCC_ARM --profile release
note: mcu (TARGET) must/should be configured in ".mbed"

[mbed-ci]

Automatic CI verification build not done, please verify manually.

[0xc0170]

Hi, can you please sign https://os.mbed.com/contributor_agreement/

[DBS06]

Hi, I signed, I thought the pdf per mail was enough

[cmonr]

@theotherjimmy Think you could take a quick look at this?

[theotherjimmy]

I think the old style of parsing was done to skip over lines and find the ^ character indicating the column number of the error. I don't think this new regex does the same thing. Could you show an example of it parsing a multi-line error before and after?

The new code just reads that from the line, doesn't it?

[theotherjimmy]

note: mcu (TARGET) must/should be configured in ".mbed"

note: mcu can be provided on the CLI with -m.

[theotherjimmy]

as this must be profile agnostic, why did you include --profile release in the command line? is that required?

[theotherjimmy]

Supposing this is confirmed to work with more than --profile release (it should, I just want to check)

[0xc0170]

/morph build

[0xc0170]

as this must be profile agnostic, why did you include --profile release in the command line? is that required?

@DBS06 How did you test (all profiles) ?

[mbed-ci]

Build : SUCCESS

Build number : 1086
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5915/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 763
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5915/

[mbed-ci]

Test : SUCCESS

Build number : 893
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5915/893

[cmonr]

Waiting on reply from @DBS06

[0xc0170]

Passed all tests, green