------- Comment #1 from burnus at gcc dot gnu dot org 2009-02-13 10:34 ------- For completeness, the F2003 standard has in "4.4.4 Character type"
"The length is a type parameter; its value is greater than or equal to zero." and later "If the character length parameter value evaluates to a negative value, the length of character entities declared is zero." Thus len=-1 is valid and equivalent to len=0. The warning is OK in my opinion as I cannot see any reason why one would like to have it negative at compile-time (init expression). (Maybe generated code/preprocessor expressions, but even then a warning might be helpful.) Whether the warning should be on by default or only with -W... is another question. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39171
