When using -fsearch-include-path, we prepend the result of
search_path_head to the provided filenames, which for non-absolute paths
will return "./". At this point, stdin is represented by the empty
string, and so prepending "./" confuses 'open_file'. This patch fixes
the issue by treating stdin as-if it were an absolute path.
PR c++/119756
libcpp/ChangeLog:
* files.cc (search_path_head): Also treat empty string (stdin)
as an absolute path.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>
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