<div dir="ltr">Thank you! Removing the -ffast-math flag, I was able to compile both serial and parallel (.sopt and .ssmp) versions on Windows 10 via Cygwin. The next step is to add CUDA support.<br><br>On Tuesday, March 17, 2020 at 4:01:52 AM UTC-7, brhr wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir="ltr"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div dir="ltr"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div><br></div></blockquote></div></blockquote><div><br></div><div><div>Dear Ryan,</div><div>The -ffast-math flag is no longer supported for recent versions as you can see.<br>I've removed the flag from <a href="https://github.com/brhr-iwao/CP2K_for_Windows/blob/master/Cygwin-i686-gfortran-FFTW3-LIBINT2-SIRIUS.sopt" target="_blank" rel="nofollow" onmousedown="this.href='https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Fbrhr-iwao%2FCP2K_for_Windows%2Fblob%2Fmaster%2FCygwin-i686-gfortran-FFTW3-LIBINT2-SIRIUS.sopt\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNGjqVk2ISrMtfmqtlMFlYmsFccvgg';return true;" onclick="this.href='https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Fbrhr-iwao%2FCP2K_for_Windows%2Fblob%2Fmaster%2FCygwin-i686-gfortran-FFTW3-LIBINT2-SIRIUS.sopt\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNGjqVk2ISrMtfmqtlMFlYmsFccvgg';return true;">a arch file</a> for recent versions of cp2k, as shown in my <a href="https://github.com/brhr-iwao/CP2K_for_Windows" target="_blank" rel="nofollow" onmousedown="this.href='https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Fbrhr-iwao%2FCP2K_for_Windows\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNGma9D4nTWoR5ZXb4Q_r8eI8ilvHA';return true;" onclick="this.href='https://www.google.com/url?q\x3dhttps%3A%2F%2Fgithub.com%2Fbrhr-iwao%2FCP2K_for_Windows\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNGma9D4nTWoR5ZXb4Q_r8eI8ilvHA';return true;">github</a>.</div><div>It also should be removed from the <a href="https://www.cp2k.org/howto:compile_on_windows_with_cygwin#compilation_with_cygwin" target="_blank" rel="nofollow" onmousedown="this.href='https://www.google.com/url?q\x3dhttps%3A%2F%2Fwww.cp2k.org%2Fhowto%3Acompile_on_windows_with_cygwin%23compilation_with_cygwin\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHNgv_AUrrwWLjJ7jnt6KFm1-5DKw';return true;" onclick="this.href='https://www.google.com/url?q\x3dhttps%3A%2F%2Fwww.cp2k.org%2Fhowto%3Acompile_on_windows_with_cygwin%23compilation_with_cygwin\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNHNgv_AUrrwWLjJ7jnt6KFm1-5DKw';return true;">example</a> arch in cp2k HOWTOs...</div><div>Regards,</div><div>Aoyama Iwao </div></div></div></blockquote></div>