OS2 ARM build is no more possible

[jeromecoutant]

Description

I couldn't compile targets with ARM.

Ex:
python ./tools/build.py -m NUCLEO_L476RG -t ARM
The target NUCLEO_L476RG does not support the toolchain ARMC6
NUCLEO_L476RG supports ARM, uARM, IAR, GCC_ARM toolchains

python ./tools/build.py -m NUCLEO_L476RG -t uARM
The target NUCLEO_L476RG does not support the toolchain ARMC6
NUCLEO_L476RG supports ARM, uARM, IAR, GCC_ARM toolchains

Issue request type

[ ] Question
[ ] Enhancement
[x] Bug

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOCUSTRIA-1010

[cmonr]

@ARMmbed/mbed-os-tools @SenRamakri

[0xc0170]

I could reproduce this error as well on master today. Thanks @jeromecoutant for the report.

@theotherjimmy will mbed 2 builds be broken in the online compiler? What is the impact of this issue ?

[theotherjimmy]

@0xc0170 No

[theotherjimmy]

@jeromecoutant This should be resolved. The new error message:

> python ./tools/build.py -m NUCLEO_L476RG -t ARM
------------------------------------------------------------
Warning: We noticed that you are using Arm Compiler 5. We are deprecating the use of Arm Compiler 
5 soon. Please upgrade your environment to Arm Compiler 6 which is free to use with Mbed OS. For 
more information, please visit https://os.mbed.com/docs/mbed-os/latest/tools/index.html
------------------------------------------------------------
Could not find executable for ARMC5.
Currently set search path: No path set

Turns out this is a false positive. My bad.

[theotherjimmy]

I spoke too soon, seems uARM is still buggy WRT toolchain detection logic.