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) ?

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