https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104454
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I did try this:
--- a/libstdc++-v3/src/c++17/fs_ops.cc
+++ b/libstdc++-v3/src/c++17/fs_ops.cc
@@ -164,6 +164,21 @@ fs::canonical(const path& p, error_code& ec)
path result;
#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
const path pa = absolute(p.lexically_normal(), ec);
+#elif defined _AIX
+ // AIX realpath returns ENOENT for paths containing "//.."
+ path pa;
+ auto str = p.native();
+ auto pos = str.find("//..");
+ if (pos == str.npos)
+ pa = absolute(p, ec);
+ else
+ {
+ do {
+ str.erase(pos, 1);
+ pos = str.find("//..", pos);
+ } while (pos != str.npos);
+ pa = absolute(str, ec);
+ }
#else
const path pa = absolute(p, ec);
#endif
But it doesn't solve the trailing slash problem, so isn't a complete fix
anyway. Just avoiding realpath seems simpler.
