Hello Martin, > a user reported a bug in the MinGW version of mpop. After narrowing the > problem down, it seems that after 'fseek(f, 0, SEEK_SET)' is called for > a file 'f' that was opened in mode "r+", subsequent attempts to write to > 'f' (e.g. with fprintf) will fail on MinGW when the gnulib fseek module > is in use. The fseek module uses the fseeko module, which in turn uses > the lseek module. > > Disabling these modules (using --avoid) fixed the problem for the > reporter. I currently do not have access to a Windows system to > investigate this further myself.
We would need a test case. And, moreover, one that does not involve fflush(), ftell(), ftello(), fgetpos(), since these functions are known to not work correctly on text-mode streams on mingw [1]. Bruno [1] http://www.gnu.org/software/gnulib/manual/html_node/ftell.html
