### Description
The `mbed compile` would traceback when no linker script is found.
This PR changes that behavior to make that into a NotSupportedException,
which has decent user behavior.
Fixes#7723
### Pull request type
[x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change
### Description
I noticed that there was quite a bit missing from the mbed2 release of
the microbit today. That's because the microbit uses ARM by default and
the GCC_ARM small library. The release script was trying to release for
ARM using scan rules for uARM. Turns out we're stuck with 2 configuration
parameters for the same thing: `default_lib` for GCC and `default_toolchain`
for ARM. Dang
### Pull request type
[x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change
### Description
2 calls to `notify.cc_verbose` used the a FileRef object in place of
the file's name. Other calls to `notify.cc_info` would use just the
file name. This PR changes these 2 calls to be consistant with the rest.
### Pull request type
[x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change
IAR assembler 7.80 has some problems handling difficult macros, leading
to immediate exit with return value -11.
In particular, a URL string has been causing problems, presumably due to
the "//" resembling a comment.
A previous escaping workaround in 0d97803 seemed to work, but the crash
has still been seen with a particular target.
Previous creation of the extended command line file for the IAR
assembler was stripping quotes from macros. This rendered the resulting
definitions for string-containing macros incorrect, which means that we
can assume no assembler code is currently relying on them.
Therefore, as a precautionary measure to avoid the crash, simply remove
all macros containing strings when creating them for IAR. This
apparently clears the crashes seen during testing of
https://github.com/ARMmbed/mbed-os/pull/8023
-mcpu option if set for v8M CPU;s it will add DSP feature as default
which is optional. Hence setting just the architecture for Cortex-M23
and Cortex-M33
".cc" --> C++ source code
".hh" --> header
This change allows existing source code with this naming
convention (e.g. my company's) to be used in mbed.os projects.