https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116007
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If so, then perhaps
--- libquadmath/math/sqrtq.c.jj 2024-04-09 08:16:54.128737859 +0200
+++ libquadmath/math/sqrtq.c 2024-08-02 23:28:00.862495012 +0200
@@ -9,6 +9,9 @@
&& defined(FE_TOWARDZERO) \
&& defined(FE_INEXACT)
#define USE_SOFT_FP 1
+#if defined(_ARCH_PPC) && !defined(__LONG_DOUBLE_IEEE128__)
+#define TFtype __float128
+#endif
#include "../../libgcc/soft-fp/soft-fp.h"
#include "../../libgcc/soft-fp/quad.h"
#endif
would fix that.
