[DRE-maint] Bug#876231: ruby-nmatrix: FTBFS with GCC 7: error: call of overloaded 'abs(nm::Rational<short int>&)' is ambiguous

[Andreas Beckmann]

Package: ruby-nmatrix
Version: 0.1.0~rc3-2
Severity: serious
Justification: fails to build from source (but built successfully in the past)

Hi,

ruby-nmatrix FTBFS (at least) since GCC 7 was made the default compiler:

In file included from math.cpp:125:0:
math/idamax.h: In instantiation of 'int nm::math::idamax(size_t, DType*, int) [with DType = nm::Rational<short int>; size_t = long unsigned int]':
math/getrf.h:153:44:   required from 'int nm::math::getrf_nothrow(int, int, DType*, int, int*) [with bool RowMajor = true; DType = nm::Rational<short int>]'
math/getrf.h:211:37:   required from 'int nm::math::getrf(CBLAS_ORDER, int, int, DType*, int, int*) [with DType = nm::Rational<short int>]'
math/getrf.h:234:22:   required from 'int nm::math::clapack_getrf(CBLAS_ORDER, int, int, void*, int, int*) [with DType = nm::Rational<short int>]'
math.cpp:1295:3:   required from here
math/idamax.h:60:15: error: call of overloaded 'abs(nm::Rational<short int>&)' is ambiguous
     dmax = abs(dx[0]);
            ~~~^~~~~~~
In file included from /usr/include/c++/7/cstdlib:75:0,
                 from /usr/include/c++/7/bits/stl_algo.h:59,
                 from /usr/include/c++/7/algorithm:62,
                 from math.cpp:116:
/usr/include/stdlib.h:735:12: note: candidate: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^~~
In file included from /usr/include/c++/7/cstdlib:77:0,
                 from /usr/include/c++/7/bits/stl_algo.h:59,
                 from /usr/include/c++/7/algorithm:62,
                 from math.cpp:116:
/usr/include/c++/7/bits/std_abs.h:56:3: note: candidate: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^~~
/usr/include/c++/7/bits/std_abs.h:61:3: note: candidate: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^~~
/usr/include/c++/7/bits/std_abs.h:70:3: note: candidate: constexpr double std::abs(double)
   abs(double __x)
   ^~~
/usr/include/c++/7/bits/std_abs.h:74:3: note: candidate: constexpr float std::abs(float)
   abs(float __x)
   ^~~
/usr/include/c++/7/bits/std_abs.h:78:3: note: candidate: constexpr long double std::abs(long double)
   abs(long double __x)
   ^~~


Full log attached.

Andreas
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