I want to know if my following thought is correct: The default include paths 
have priority over the -I<path>. On the other hand, -L<path> has priority over 
default lib paths. Am I right?

I'm asking this because I read the following doc:
https://libcxx.llvm.org/docs/UsingLibcxx.html
which has the following advice:

-------------------- Pasting 
-------------------------------------------------------------
If you want to select an alternate installation of libc++ you can use the 
following options.

$ clang++ -std=c++11 -stdlib=libc++ -nostdinc++ \
          -I<libcxx-install-prefix>/include/c++/v1 \
          -L<libcxx-install-prefix>/lib \
          -Wl,-rpath,<libcxx-install-prefix>/lib \
          test.cpp
--------------------------------------------------------------------------------------------

As you can see he puts the option: -nostdinc++ because (I think) the "default 
include path" has priority over the I<path>.
At same time, there is not a similar option there to remove "default lib path"s 
so that make me think that the L<path> has priority over "default lib path".
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