On 01/05/2019 01:09, Jonathan Wakely wrote: > The current generic implementation of __complex_proj used when cproj is > not available calculates the wrong projection, giving a different result > than given by C99's cproj. > > When C99 cproj is not available but isinf and copysign are, use those to > give correct results for float, double and long double. Otherwise, and > for other specializations of std::complex, just use a generic version > that returns its argument, and so doesn't support infinities. > > We might want to consider adding additional overloads of __complex_proj > to support extended types such as _Float64x, _Float128 etc. > > PR libstdc++/61761 > * include/std/complex (__complex_proj): Return parameter unchanged. > [_GLIBCXX_USE_C99_COMPLEX] (__complex_proj): Change overloads for > floating-point types to take std::complex arguments. > [_GLIBCXX_USE_C99_MATH_TR1] (__complex_proj): Add overloads for > floating-point types. > * testsuite/26_numerics/complex/proj.cc: New test. > > Tested powerpc64le-linux, powerpc-aix7.2.0.0, x86_64-freebsd11.2, > committed to trunk.
fails on aarch64-none-elf (newlib) with FAIL: 26_numerics/complex/proj.cc (test for excess errors) Excess errors: /work/b/src/gcc/libstdc++-v3/testsuite/26_numerics/complex/proj.cc:32: error: 'copysign' is not a member of 'std'; did you mean 'copy_n'? /work/b/src/gcc/libstdc++-v3/testsuite/26_numerics/complex/proj.cc:32: error: 'copysign' is not a member of 'std'; did you mean 'copy_n'? /work/b/src/gcc/libstdc++-v3/testsuite/26_numerics/complex/proj.cc:34: error: 'copysign' is not a member of 'std'; did you mean 'copy_n'? /work/b/src/gcc/libstdc++-v3/testsuite/26_numerics/complex/proj.cc:34: error: 'copysign' is not a member of 'std'; did you mean 'copy_n'? i assume std::copysign should be visible in <complex> via <cmath> but cmath does not have it.
