gettext: gcc-internal-format

 
 15.3.25 GCC internal Format Strings
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    These format strings are used inside the GCC sources.  In such a
 format string, a directive starts with ‘%’, is optionally followed by a
 size specifier ‘l’, an optional flag ‘+’, another optional flag ‘#’, and
 is finished by a specifier: ‘%’ denotes a literal percent sign, ‘c’
 denotes a character, ‘s’ denotes a string, ‘i’ and ‘d’ denote an
 integer, ‘o’, ‘u’, ‘x’ denote an unsigned integer, ‘.*s’ denotes a
 string preceded by a width specification, ‘H’ denotes a ‘location_t *’
 pointer, ‘D’ denotes a general declaration, ‘F’ denotes a function
 declaration, ‘T’ denotes a type, ‘A’ denotes a function argument, ‘C’
 denotes a tree code, ‘E’ denotes an expression, ‘L’ denotes a
 programming language, ‘O’ denotes a binary operator, ‘P’ denotes a
 function parameter, ‘Q’ denotes an assignment operator, ‘V’ denotes a
 const/volatile qualifier.