> You could refer to GCC's source and test suite
>From the clang code:
...
// If this is a system #include, ignore the user #include locs.
unsigned i = isAngled ? SystemDirIdx : 0;
...
// If this is a #include_next request, start searching after the directory the
// file was found in.
if (FromDir)
i = FromDir-&SearchDirs[0];
...
// Check each directory in sequence to see if it contains this file.
for (; i != SearchDirs.size(); ++i) {
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