En esta pagina, un buscador de código fuente en C/C++ http://csourcesearch.net/stats/ me he encontrado con los siguientes datos...
Number of Packages: 3,402
Total Number of Files: 419,967
Total Lines of Code (No comments, no blank lines): 107,086,083
Total of All Lines: 156,962,391
Total Number of Functions: 2,937,286
Total Number of Functions Called: 27,790,597
Total Number of Macros: 2,937,647
Total Number of Classes: 83,815
Total Number of Comments: 13,654,458
Total Number of Structures: 184,610
Total Number of Unions: 3,641
Total Number of Includes: 2,203,220
Y digo yo, de media...