[Bug preprocessor/69391] Incorrect __LINE__ expansion with -ftrack-macro-expansion=0 on g++5.2

[mail at bobah dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69391

--- Comment #2 from mail at bobah dot net ---
And if I make this change it works even with '-ftrack-macro-expansion=0'

- #define LINE STR(__LINE__) STR(__LINE__)
+ #define LINE() STR(__LINE__) STR(__LINE__)
-     std::cout << LINE << "\n";
+     std::cout << LINE() << "\n";