Can't build for Blue Pill with Arduino framework

[vshymanskyy]

Example of failed build task:
https://travis-ci.org/blynkkk/blynk-library/jobs/161392538

[ivankravets]

@ubis, would be thankful for any help on it.

[ubis]

Seems like _sbrk function is in variants/mcu_variant/syscalls.c.
For some reason it's not linking, due that undefined reference appears.
I will look into this tomorrow, I'm really busy today, sorry.

[ubis]

Okay, seems like I found what's causing this. I've added "libc" to builder LIBS(array..?) And it linked properly. However, I found that there are libgcc/libc/libm used in ld scripts, and as I noticed, builder script have:

LIBS=["c", "gcc", "m", "stdc++", "nosys"]

What's the difference? If I remove c from LIBS and add libc it won't link. But, if I add libc and keep c, it does link.

[ivankravets]

Check linker output with pio run --verbose. Is this command correct?

[ubis]

Okay, this is wierd. Without "libc":

-lc -lgcc -lm -lstdc++ -lnosys

With "libc":

-lc -lgcc -lm -lstdc++ -lnosys -lc

So I changed "libc" to "c" and it still worked. I thought, maybe position could be wrong... But, it doesn't work if there is only one "c" in LIBS. Even this one works:

-lgcc -lm -lc -lc

I checked linker params when bulding with Arduino IDE. It has only libm and libgcc, and it includes syscalls object file in linker start/end group.

[ivankravets]

1. libc == c. The same, use c.
2. Double c is very strange. Something is wrong with GCC LD circle finder.

Could you try to replace env.BuildLibrary with env.BuildSources?

• https://github.com/platformio/platform-ststm32/blob/develop/builder/frameworks/arduino.py#L131
• https://github.com/platformio/platform-ststm32/blob/develop/builder/frameworks/arduino.py#L136

[ubis]

So i've changed env.BuildLibrary with env.BuildSources.
Still no luck - won't link with one c and still does with double c.

[ivankravets]

Ok, let's keep env.BuildLibrary and double c. I don't want to waste your time. We will take a look at it later.

[ubis]

Ups, my bad sorry(again, lol). I actually changed it on my fork and I didn't moved it to stm platform folder.

Now, it produces error:

*** [.pioenvs\genericSTM32F103RB\firmware.elf] Implicit dependency .pioenvs\genericSTM32F103RB\None not found, needed by target .pioenvs\genericSTM32F103RB\firmware.elf.

Since now it doesn't make *.a lib, it can't go further, I think..
Eh.. And that's okay. I'm free now, and actually we are wasting your time with this platform ;)

[ivankravets]

Would be good to see build output from Make or Arduino IDE, to compare commands. How do you program STM32Duino without PlatformIO?

[ubis]

You can use Arduino IDE, and get arduino stm32 from repo. It has installation page aswell.

But, I could upload log to pastebin or so.

[ivankravets]

Would be thankful for pastebin log.

[ubis]

Here it is: http://pastebin.com/8MnCWLYv.
It's kinda ugly. And when I was adding support for STM32Duino, I had to compare aswell. It has some duplicate flags.

Ah, I forgot that I'm using compiler toolchain from PlatformIO. I did that to see if there is any changes(Arduino IDE uses older toolchain), but there wasn't any, so I left it.

[ivankravets]

-lm -lgcc -mthumb -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-section-align -Wl,--warn-unresolved-symbols

I don't see here c lib. Maybe this is problem? Need to remove all libs and pass only m and gcc.
Within builder/framework/arduino.py

env.Replace(LIBS=["m", "gcc"])

[ubis]

Yes, I tried, no luck. I updated my comment back then.

[leodesigner]

Hi,
I have exactly the same problem.
At the moment I am fixing this with:

env.Replace(LIBS=["c", "gcc", "m", "stdc++", "nosys", "c"])

in arduino.py (line 124)

[leodesigner]

Also - this may be relevant to compiler/linker options:
The binary file produced by the platformio is a bit bigger comparing to the file compiled by the stm32duino(Arduino 1.6.12). It contains debugging info probably - some text lines like:

.platformio/packages/framework-arduinoststm32/STM32F1/cores/maple/HardwareTimer.cpp

in the resulting binary file.

[vshymanskyy]

Any ideas how this can be fixed?

[ivankravets]

Development platform will be released today.