Mbed-os: Re-compile fails with ARM Compiler 5 and REALTEK_RTL8195AM

[jamesbeyond]

Description

• Type: Bug
• Priority: Minor

---

Bug

Target
REALTEK_RTL8195AM

Toolchain:
ARM

Toolchain version:
ARM Compiler 5 update 3

mbed-cli version:
1.3.0

mbed-os sha:
6ff720302 (mbed-os-5.8.0-rc1)

DAPLink version:

Expected behavior
Re-compile mbed-os-example-wifi example should not throw errors.

Actual behavior
Re-compile mbed-os-example-wifi example on REALTEK_RTL8195AM thrown errors:

Elf2Bin: mbed-os-example-wifi
Error: Q0147E: Failed to create Directory .\BUILD\REALTEK_RTL8195AM\ARM\mbed-os-example-wifi.bin\IMAGE2_TABLE: File exists
Finished: 0 information, 0 warning and 1 error messages.
[ERROR] Error: Q0147E: Failed to create Directory .\BUILD\REALTEK_RTL8195AM\ARM\mbed-os-example-wifi.bin\IMAGE2_TABLE: File exists
Finished: 0 information, 0 warning and 1 error messages.

Steps to reproduce

1. import example and update to mbed-os 5.8.0-oob
   mbed import mbed-os-example-wifi
cd mbed-os-example-wifi
mbed update mbed-os-5.8.0-oob
2. Compiler the example first time
   mbed compile -t ARM -m REALTEK_RTL8195AM
3. modify wifi password in mbed_app.json
4. Re-compile the example again
   mbed compile -t ARM -m REALTEK_RTL8195AM

The problem only happens on Re-compile. if I do a clean first, the compiling would be fine.
Only with REALTEK_RTL8195AM board, other boards are fine.
Only with ARM Compiler 5. Gcc and IAR are fine.

[theotherjimmy]

@jamesbeyond Is this bug specific to example wifi? does this affect any other examples?

[jamesbeyond]

Just had a quick try, other examples have the same problem. @theotherjimmy

[theotherjimmy]

Thanks!

[theotherjimmy]

@0xc0170 This is not related to online deployment. What gave you that impression?

[adbridge]

@theotherjimmy It doesn't look like a fix for this will make it into RC2 so we may need a known issue adding to the docs for this ?

[theotherjimmy]

That's true. Known issue coming.

[samchuarm]

@ARMmbed/team-realtek

[yangkunming99]

Hi, this is because ARM compiler always create a temp folder with the same name as the output binary. from my observation, the only way is to os.path.exists() and remove() in arm.py:link(). @0xc0170 @samchuarm

[tung7970]

I can think of two solutions:

1. like @yangkunming99 mentioned, a path removal call such as shutil.rmtree() before elf2bin
2. add --bincombined option to fromelf so it generates plain file instead of directory for multi-load regions

I personally prefer option 2 since it solves the problem and also makes armcc behave like the rest

[tung7970]

Is this ok ?

https://github.com/ARMmbed/mbed-os/pull/6344

[theotherjimmy]

@thegecko FYI, Realtek will likely download more than one file in the online compiler. I don't know if you were aware, or if you handle it.

[thegecko]

I'm not aware of a way to serve more than one binary, is this a new requirement?

[theotherjimmy]

@tung7970 I'm not able to answer @thegecko 's question. Could you?

[tung7970]

@thegecko Still one download. Binary files are post-processed beforehand.

[theotherjimmy]

Thanks! @thegecko Sorry for the noise.

[adbridge]

fixed by #6344