Troubleshooting MPSolve Compilation Errors: A Quick Fix Guide

Are you struggling to compile the MPSolve library for polynomial root approximation? You're not alone! Many users encounter compilation errors, especially when using newer C++ compilers. This guide provides a step-by-step solution to get you up and running quickly. We will address the common compilation problems of isnan and isinf errors with MPSolve compilation.

Why MPSolve Fails to Compile and what is MPSolve?

MPSolve is a powerful open-source library that lets you approximate the values of polynomial roots. The core reason for these errors lies in a conflict between macro definitions within MPSolve's types.h header file and standard functions in the C++ cmath library. Specifically, the isnan() and isinf() macros defined in types.h clash with the identically named functions in cmath, leading to compilation errors. This issue has been acknowledged but not yet resolved by the MPSolve developers.

The Quick Fix: Comment Out Conflicting Macros to fix the MPSolve compilation problem in macOS and Linux

The easiest and most reliable solution is to comment out the problematic macro definitions in types.h. Here's how:

1. Locate the types.h file: After extracting the MPSolve tarball, navigate to the mpsolve-3.2.2/include/mps/ directory (the version number may vary).
2. Edit types.h: Open the types.h file in a text editor.
3. Comment out isnan and isinf macros: Find the sections defining the isnan and isinf macros and comment them out using /* and */. Your code should look like this:

#include <math.h>
/*conlfict with std::isnan and std::isinf
#ifndef isnan
# define isnan(x) \
  (sizeof(x) == sizeof(long double)? isnan_ld (x) \
  : sizeof(x) == sizeof(double)? isnan_d (x) \
  : isnan_f (x))
static inline int isnan_f (float x)
{
  return x!= x;
}
static inline int isnan_d (double x)
{
  return x!= x;
}
static inline int isnan_ld (long double x)
{
  return x!= x;
}
#endif
#ifndef isinf
# define isinf(x) \
  (sizeof(x) == sizeof(long double)? isinf_ld (x) \
  : sizeof(x) == sizeof(double)? isinf_d (x) \
  : isinf_f (x))
static inline int isinf_f (float x)
{
  return !isnan (x) && isnan (x - x);
}
static inline int isinf_d (double x)
{
  return !isnan (x) && isnan (x - x);
}
static inline int isinf_ld (long double x)
{
  return !isnan (x) && isnan (x - x);
}
#endif
*/

4. Save the file: Save the modified types.h file.
5. Recompile MPSolve: Retry compiling the library following the instructions in the INSTALL.txt file.

Understanding the Impact

By commenting out these macros, you're allowing the compiler to use the standard isnan and isinf functions from the cmath library. This resolves the naming conflict and enables successful compilation.

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