Deprecation warnings

[AnHeuermann]

While compiling OMTLMSimulator from OMSimulator I get a bunch of warnings. Some of them are errors under C++17.

clang++ -fPIC    -I../include   -c g2c_w32.c -o LINUX64/g2c_w32.o 
clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]

In file included from ../3rdParty/misc/include/coordTransform.h:599:
../3rdParty/misc/include/coordTransform.icc:149:5: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
    register double tmp;
    ^~~~~~~~~
1 warning generated.

make[3]: Entering directory '/home/aheuermann1/workspace/OMSimulator/OMTLMSimulator/FMIWrapper'
clang++  -std=c++11 -fPIC -pipe -O2 -frtti -Wall -Wextra -fexceptions -DUNICODE -DINTERFACE_TYPES -I. -I"../FMIWrapper" -I"../../3rdParty/FMIL/install/linux/include" -I"../../3rdParty/RegEx" -I"../common" -I"../3rdParty/misc/include" -I"cvode-2.9.0/include" -I"ida-2.9.0/include" -c ../3rdParty/misc/src/double33s.cc -o LINUX64/double33s.o
In file included from ../3rdParty/misc/src/double33s.cc:10:
In file included from ../3rdParty/misc/include/double33s.h:292:
../3rdParty/misc/include/float33s.h:68:22: warning: definition of implicit copy constructor for 'float33s' is deprecated because it has a user-declared copy assignment operator [-Wdeprecated-copy]
    inline float33s& operator=(const float33s& m) ;
                     ^
../3rdParty/misc/include/float33s.inc:28:12: note: in implicit copy constructor for 'float33s' first required here
    return float33s(a.x11+b.x11,a.x22+b.x22,a.x33+b.x33,a.x12+b.x12,a.x23+b.x23,a.x13+b.x13);
           ^
../3rdParty/misc/src/double33s.cc:15:22: warning: unused function 'sqr' [-Wunused-function]
static inline double sqr(const double x) { return x * x; }
                     ^
2 warnings generated.

I have CC=clang, CXX=clang++ defined.

---

OS: Ubuntu 20.04 OMTLMSimulator: cceb7be

[perost]

The solution for the second error is to just remove the assignment operator in float33s.inc, because the class doesn't need it and it it breaks the rule of three. It's a third party library though, so it might be that it should be updated to a never version instead of fixing it on our side.

[AnHeuermann]

I think I found the error for the first warning: https://github.com/OpenModelica/OMSimulator/blob/master/Makefile#L131

[AnHeuermann]

@perost Do you know where the 3rdParty stuff is coming from? misc doesn't tell me much and I don't find anything for double33.

[perost]

@perost Do you know where the 3rdParty stuff is coming from? misc doesn't tell me much and I don't find anything for double33.

double33s.cc contains the comment:

// The eigenvalue/eigensystem solvers are rewritten in C++/lightmat interface by I.Nakhimovski from:
// Joachim Kopp
// Numerical diagonalization of hermitian 3x3 matrices
// arXiv.org preprint: physics/0610206
// http://www.mpi-hd.mpg.de/~jkopp/3x3/

But the link is dead, and it seems the actual C++ code was written by someone else anyway.

[AnHeuermann]

Do you think this could be the cause for segmentation faults described in https://github.com/OpenModelica/OMSimulator/issues/1099#issue-1060261911?

[perost]

Do you think this could be the cause for segmentation faults described in OpenModelica/OMSimulator#1099 (comment)?

No, it's just a warning that relying on the compiler to generate a copy constructor in that situation is deprecated, but the compiler will still do it.