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libcpp: Fix reading from stdin with -fsearch-include-path [PR119756]

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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>
This commit is contained in:
Nathaniel Shead
2026-02-22 00:32:00 +11:00
parent 6412564277
commit 81b437bad0
1 changed files with 1 additions and 1 deletions
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libcpp/files.cc
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@@ -1095,7 +1095,7 @@ search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets,
cpp_dir *dir;
_cpp_file *file;
if (IS_ABSOLUTE_PATH (fname))
if (IS_ABSOLUTE_PATH (fname) || *fname == '\0')
return &pfile->no_search_path;
/* pfile->buffer is NULL when processing an -include command-line flag. */