Solved: iostream problems

annosauer1 · ‎02-08-2019

Vivado 2018.3, Zynq UltraScale, using EIGEN library

The following program works perfectly fine in MS Visual Studio

#include <iostream>
#include <Eigen/Dense>
using Eigen::MatrixXd;

int main()
{
  MatrixXd m(2,2);
  m(0,0) = 3;
  m(1,0) = 2.5;
  m(0,1) = -1;
  m(1,1) = m(1,0) + m(0,1);
  std::cout << m << std::endl;
}

But in Vivado SDK I get the following error messages

'std::log1p' has not been declared
'std::round' has not been declared

This is clearly related to the iostream functions.

The Eigen library apparently use some "newer" iostream features

I have tried to add

-std=g++11
//or
-std=g++0x

(as was suggested in some posts) to the compiler flags (Properties/Settings)

just to get another error message

Cannot find -lstdc++11

Has anybody ever successfuly used the EIGEN library in VIVADO SDK and what compiler flags do I have to set or

what do I have to do to make this work?

THANKS

annosauer1 · ‎02-09-2019

After a few hours of trying all sorts of silly things...

First my application is obviously a lot more complex than the example above.

I am using freeRTOS, lwIP and the Eigen library and the application is C++.

Mixing C and C++ has its own unique problems... however

1. Properties/Settings/C/C++ Build/ARM v8 g++ compiler/Directories..... add <path to Eigen library>

2. Properties/Settings/C/C++ Build/ARM v8 g++ compiler/Inferred Options/Software Platform/ .... Software Platform Inferred Flags ... add -std=g++11

3. Then you must add the include files to the Eigen library BEFORE everything else. (only took me 8 hours to figure this out).

4. These are my other properties settings... for freeRTOS and lwIP

Properties/Settings/C/C++ Build/ARM v8 g++ linker/Inferred Options/Software Platform/ .... Software Platform Inferred Flags ... add

-Wl,--start-group,-lxil,-lfreertos,-lgcc,-lc,-lstdc++,--end-group

-Wl,--start-group,-lxil,-llwip4,-lgcc,-lc,-lstdc++,--end-group

5. in FreeRtosConfig.h you may want to change a few default values

#define configTOTAL_HEAP_SIZE ( ( size_t ) ( 16777216 ) )

6. Then the lwIP default settings are also good for nothing, just copy the settings from one of the provided demo programs

What tripped me up was:

Under tcp_options / tcp_snd_buf the maximum value is 65535 NOT 65536 (as I had to find out the hard way)

good luck

View solution in original post

xilinxacct · ‎02-09-2019

@annosauer1

Here is one thing to try... #include <cmath> before including Eigen/Dense

Hope this helps

If so, please mark as solution accepted. Kudos also weclomed. :-)

annosauer1 · ‎02-09-2019