确定头文件的位置

gcc -v hello.c ^* #include :

$ gcc -v hello.c
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
...
clang -cc1 version 9.1.0 (clang-902.0.39.2) default target x86_64-apple-darwin17.7.0
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /Library/Developer/CommandLineTools/usr/lib/clang/9.1.0/include
 /Library/Developer/CommandLineTools/usr/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.

有没有办法确定使用这些位置中的哪一个? 比如说 hello.c #include <stdio.h> . 我可以手动看到 stdio.h

$ find /usr/local/include -name "stdio.h"
/usr/local/include/c++/5.5.0/tr1/stdio.h

$ find /Library/Developer/CommandLineTools/usr/include -name "stdio.h"
/Library/Developer/CommandLineTools/usr/include/c++/v1/stdio.h

$ find /usr/include -name "stdio.h"
/usr/include/c++/4.2.1/tr1/stdio.h
/usr/include/sys/stdio.h
/usr/include/stdio.h

在Python中,这看起来像:

>>> import math
>>> math.__file__
'/Users/brad/miniconda3/lib/python3.6/lib-dynload/math.cpython-36m-darwin.so'

_{*我在用Macbook,所以 gcc 实际上似乎是 clang ,尽管它看起来是一个真正的可执行文件,而不是符号链接。}