tflite-micro is breaking complex.h

[pschatzmann]

Board

Any

Device Description

The issue is with all boards: I tried with the ESP32 and a C6

Hardware Configuration

n/a

Version

latest development Release Candidate (RC-X)

IDE Name

Arduino IDE

Operating System

Linux Mint

Flash frequency

n/a

PSRAM enabled

no

Upload speed

n/a

Description

The new version (4.0.0) contains espressif__esp-tflite-micro which has a complex.h in the src directory:
~/.arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-3662303f312/esp32/include/espressif__esp-tflite-micro/signal/src/complex.h

This is preventing that the regular complex.h from the c and c++ library can be used!
So all libraries containing complex.h are broken and will produce compile errors.

Sketch

#include <complex.h>

std::complex<double> mycomplex(10.0, 2.0);

void setup() {}

void loop() {}

Debug Message

Compile error:

/tmp/.arduinoIDE-unsaved2024315-466177-1nzbc94.mycl/sketch_apr15c/sketch_apr15c.ino:3:6: error: 'complex' in namespace 'std' does not name a template type
    3 | std::complex<double> mycomplex(10.0, 2.0);
      |      ^~~~~~~
/tmp/.arduinoIDE-unsaved2024315-466177-1nzbc94.mycl/sketch_apr15c/sketch_apr15c.ino:2:1: note: 'std::complex' is defined in header '<complex>'; did you forget to '#include <complex>'?
    1 | #include <complex.h>
  +++ |+#include <complex>
    2 | 

exit status 1

Compilation error: 'complex' in namespace 'std' does not name a template type

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[pschatzmann]

I messed up with the version info: of cause it is 3.0.0-rc1

[lucasssvaz]

The CPP STD header name is complex without the .h

This will compile without any issue:

#include <complex>

std::complex<double> mycomplex(10.0, 2.0);

void setup() {}

void loop() {}

[me-no-dev]

#include <complex> not <complex.h>. Would that work?

[pschatzmann]

For the indicated example it would work, but I filed the issue because some sketches which are using c libraries (some audio codecs and fft) are not compiling any more and it was too tedious to demo the issue in c.

I wanted proof the point that complex.h is broken in C!

e.g.
https://github.com/pschatzmann/esp32-fft
https://github.com/pschatzmann/arduino-codec2
https://github.com/pschatzmann/kissfft

[me-no-dev]

If you think that complex.h is broken, maybe file an issue in the toolchain repository: https://github.com/espressif/crosstool-NG/issues

[pschatzmann]

So it is the toolchain and not arduino-esp32 that decides to include and make available tflite-micro ?

[me-no-dev]

@pschatzmann we did resolve your original issue. For the others it's too tedious for you to properly report. I am still trying to offer you a way to resolve the problem, for which I only know that it has to do with complex.h.

[pschatzmann]

I can create an additional simple example (on top of the mentioned libraries that give compile errors) if that helps you to understand the issue. Please let me know!

[me-no-dev]

Yes it will. thanks!

[pschatzmann]

In Arduino, create a new tab: test.c with the following lines:

#include <complex.h> 
double complex  z  = 3.2 + 4.1 * I; 

This gives the following error:

In file included from /tmp/.arduinoIDE-unsaved2024316-5867-1odft3o.2uay/sketch_apr16a/test.c:1:
/home/pschatzmann/.arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-3662303f312/esp32/include/espressif__esp-tflite-micro/signal/src/complex.h:23:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
   23 | template <typename T>
      |          ^
/tmp/.arduinoIDE-unsaved2024316-5867-1odft3o.2uay/sketch_apr16a/test.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'z'
    2 | double complex  z  = 3.2 + 4.1 * I;
      |                 ^

exit status 1

Compilation error: expected '=', ',', ';', 'asm' or '__attribute__' before 'z'

Deleting the file ~/.arduino15/packages/esp32/tools/esp32-arduino-libs/idf-release_v5.1-3662303f312/esp32/include/espressif__esp-tflite-micro/signal/src/complex.h is correcting the issue!

So this is the root cause of the issue! and any Arduino library using complex.h in a c file will not work any more.

This example is working properly in prior versions