Between GCC 9 and 10, the following code now errors out: integer function fcn(x) implicit none integer, intent(in) :: x fcn = x * '0100'X end function fcn
Error: BOZ constant at (1) uses nonstandard postfix syntax [see '-fno-allow-invalid-boz'] Compiler returned: 1 First, the error message is wrong regarding the option to go see: gfortran: error: unrecognized command-line option '-fno-allow-invalid-boz'; did you mean '-fallow-invalid-boz'? Second, that option doesn't protect against the aforementioned case. Third, and the main point of this email I guess, is that the porting-to page should mention this: https://www.gnu.org/software/gcc/gcc-10/porting_to.html It talks about argument mismatches, but it doesn't talk about BOZ literals in expressions, which used to be (perhaps incorrectly) accepted. There is no new command line option to accept this legacy code, so the webpage should be updated at a minimum.
