Message A character string literal was concatenated with a wide string literal. Description The C99 standard defines the behavior of adjacent string concatenation between character string literals and wide string literals, basically promoting the character string to a wide string before forming the wide string result. The older C90 standard gave this construct undefined behavior - it only defined concatenation between adjacent strings of the same kind (all character or all wide). Although this version of HP C always gives the C99 behavior with diagnostics optional, some compilers (including previous versions of HP C) may give more severe diagnostics and/or different behaviors. User Action Be aware of this if you wish to port the program.