------- Comment #2 from jvdelisle at gcc dot gnu dot org 2007-08-25 16:20 ------- >From 9.4.1
R913 format is default-char-expr or label or ∗ >From 10.1.2 A character expression used as a format specifier in a formatted input/output statement shall evaluate to a character string whose leading part is a valid format specification. NOTE 10.2 The format specification begins with a left parenthesis and ends with a right parenthesis. IMHO This is invalid. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33189