What Did That Macro Expand to? - Video

Did you know that your compiler likely is parsing its way through close to 100,000 lines of code for a simple "Hello World!" in Qt? Let's give it a standing applause for its hard work.

Did you also know you easily can see what exactly is given to the compiler for each source file you ask it to compile? You can, and, in this episode, we will show you how.

We will, of course, also discuss when this is useful knowledge at all.

Links:
* ninja doesn't support .cpp.i files: https://gitlab.kitware.com/cmake/cmake/-/issues/13838
* The meaning of the flags at the end of the preprocessed files: https://stackoverflow.com/questions/5370539/what-is-the-meaning-of-lines-starting-with-a-hash-sign-and-number-like-1-a-c/5370592#5370592

0:00 Introduction
0:50 Compiler and pre-processor, and especially -E option
1:37 A really weird compile error
5:05 qmake - and manually adding -E
7:24 qmake and "-save-temps" option
8:18 CMake + make
8:52 make Foo.cpp.i
9:33 CMake + ninja
12:28 Macro expansion in Qt Creator

All QML tips and tricks videos : https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

All Qt Widgets and more videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI