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These format strings are used inside the GNU Fortran Compiler sources, that is, the Fortran frontend in the GCC sources. In such a format string, a directive starts with ‘%’ and is finished by a specifier: ‘%’ denotes a literal percent sign, ‘C’ denotes the current source location, ‘L’ denotes a source location, ‘c’ denotes a character, ‘s’ denotes a string, ‘i’ and ‘d’ denote an integer, ‘u’ denotes an unsigned integer. ‘i’, ‘d’, and ‘u’ may be preceded by a size specifier ‘l’.