Often I have used the option "-ffast-math", but now:
$ gfortran -O3 -ffast-math nbody.f90 -o nbody.out
/usr/lib/gcc/x86_64-pc-msys/6.3.0/../../../../x86_64-pc-msys/bin/ld:
impossibile trovare crtfastmath.o: No such file or directory
collect2: error: ld returned 1 exit status
This only occurs for the MSYS2-x86_64 version of the compiler. The
MinGW64 (and the WSL, which is 5.4.0 20160609) work as expected.
Angelo
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