Max length of path on Windows is 255, which is easy to exceed in a complicated project. Ultimate solution may be complex but canonizing the path and skipping the ".."s in path is helpful.
Relative discussion in gcc-patches: http://gcc.gnu.org/ml/gcc-patches/2013-11/msg00582.html OK to trunk stage 1? ChangeLog.libcpp: * files.c (find_file_in_dir): Always try to shorten for DOS. diff --git a/libcpp/files.c b/libcpp/files.c index 7e88778..9dcc71f 100644 --- a/libcpp/files.c +++ b/libcpp/files.c @@ -386,9 +386,18 @@ find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) hashval_t hv; char *copy; void **pp; + bool do_canonical; +#ifdef HAVE_DOS_BASED_FILE_SYSTEM + /* For DOS based file system, we always try to shorten file path + * to as it has a shorter constraint on max path length. */ + do_canonical = true; +#else /* We try to canonicalize system headers. */ - if (CPP_OPTION (pfile, canonical_system_headers) && file->dir->sysp) + do_canonical = (CPP_OPTION (pfile, canonical_system_headers) + && file->dir->sysp); +#endif + if ( do_canonical ) { char * canonical_path = maybe_shorter_path (path); if (canonical_path)
max_path_joey-140109-1.patch
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