在 2021-04-21 16:59, Xi Ruoyao via Gcc-help 写道:
GCC is never designed to be a tool for teaching or learning. It's a compiler, for compiling programs in real-life. Basically -v is only intended to debug GCC itself.
May be GCC isn't, but it *happens to*, and I think it is a good one, because it's free software and comes with a huge community.
Unfortunately, while every physics teacher knows he/she shouldn't use a car to teach mechanics, many CS101 teachers keep telling the student "if you don't understand something, just do a experiment". IMO it's pure laziness.
The purpose of the topic of this thread is a bit dubious. As you have pointed out, as a driver (not a compiler or front-end whatsoever!), how GCC invokes other programs (cc1, cc1plus, collect2, as, ld, and so on) is purely implementation details, which users shouldn't care about. But save for that, I fail to see anything wrong with the question itself, and I disagree with you: It is almost always better for students to learn from their experiences, their mistakes, their failures, rather than textbooks. Nonetheless, there are still metaphysical things that people can't learn from experiences (e.g. undefined behavior).
You can read libtool code, for example. Libtool is basically a compatibility wrapper for gcc/ld/ar. I'm sure everyone will feel disgusting by reading 12562 lines of shell code in it.
Modern libtool uses `$(CXXLD)` for linking, which is usually the same as `$(CXX)`.Shell is less favorable because 0) it may not be available on some hosts (note: mingw), and 1) it is too error-prone especially on arguments that contain spaces, and 2) it is undesirable to have to place more incompatibility and limitation (e.g. number of bytes in a single command line) just because of the shell being used, but not of GCC itself, and 3) it is indeed very slow if `fork()` is either slow or unavailable completely.
[And please don't deviate from the topic.] -- Best regards, Liu Hao
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