https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121759
--- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> --- (In reply to ParkerLewis from comment #3) > I confirm I get the error with the 15.2.0 build > > D:\Work\toto>gcc --version > gcc (MinGW-W64 x86_64-ucrt-posix-seh, built by Brecht Sanders, r1) 15.2.0 > > WRITE ASCII FILE > writetxt : 123.456001 456.789001 ipb= 0 > > READ ASCII FILE TO CHECK > t= 123.456001 456.789001 > raw line= 123.456001 456.789001 > tline= 123.456001 456.789001 > > (DO SOME BINARY FILE ACCESS) > writebin : x= 234.567001 ipb= 0 > > READ ASCII FILE AGAIN TO EXHIBIT ISSUE > t= 123.000000 456.000000 > raw line= 123.456001 456.789001 > tline= 123.000000 456.000000 > > The same test with an older version of gcc (14.2.0) does not exhibit the > issue. Can you try with the 16 branch (experimental) ?