20550e2018-03-06Pontus Östlund ## This is proposed interface in https://github.com/sass/libsass/pull/1288 Additional debugging macros with low overhead are available, `TRACE()` and `TRACEINST()`. Both macros simulate a string stream, so they can be used like this: TRACE() << "Reached."; produces: [LibSass] parse_value parser.cpp:1384 Reached. `TRACE()` logs function name, source filename, source file name to the standard error and the attached stream to the standard error. `TRACEINST(obj)` logs object instance address, function name, source filename, source file name to the standard error and the attached stream to the standard error, for example: TRACEINST(this) << "String_Constant created " << this; produces: [LibSass] 0x8031ba980:String_Constant ./ast.hpp:1371 String_Constant created (0,"auto") The macros generate output only of `LibSass_TRACE` is set in the environment.