https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78549
--- Comment #6 from mecej4 at operamail dot com --- (In reply to Jerry DeLisle from comment #5) > > Can you explain what "Windows Subsystem for Linux (Ubuntu 14) on Windows-10" > is? Sorry if I created a bad portmanteau phrase. Here is a link to Microsoft's own description of WSL (Windows Subsystem for Linux) : https://msdn.microsoft.com/en-us/commandline/wsl/about . This beta product for Windows 10-x64 provides a Bash shell in which character I/O, user-mode Linux applications can be run (only 64-bit a.out supported). I found it fairly simple to install, and it worked well for the tests that I tried. Once Bash has been installed, one can install Ubuntu-14 packages using Apt-Get; in particular, there is a Gfortran 6.2 package that works. While browsing the sources of LibGfortran, I found the file which seemed to be a candidate for profiling: write_float.def, which I understand you are currently revising.