diff --git a/libstdc++-v3/testsuite/ext/special_functions/airy_ai/check_nan.cc b/libstdc++-v3/testsuite/ext/special_functions/airy_ai/check_nan.cc
index f6780526bd4..829ad5a5ef1 100644
--- a/libstdc++-v3/testsuite/ext/special_functions/airy_ai/check_nan.cc
+++ b/libstdc++-v3/testsuite/ext/special_functions/airy_ai/check_nan.cc
@@ -3,6 +3,7 @@
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
 // { dg-skip-if "no extensions in strict dialects" { *-*-* } { "-std=c++*" } }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/ext/special_functions/airy_bi/check_nan.cc b/libstdc++-v3/testsuite/ext/special_functions/airy_bi/check_nan.cc
index aa0405f3471..ef6e7c837ed 100644
--- a/libstdc++-v3/testsuite/ext/special_functions/airy_bi/check_nan.cc
+++ b/libstdc++-v3/testsuite/ext/special_functions/airy_bi/check_nan.cc
@@ -3,6 +3,7 @@
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
 // { dg-skip-if "no extensions in strict dialects" { *-*-* } { "-std=c++*" } }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/special_functions/07_cyl_bessel_i/check_nan.cc b/libstdc++-v3/testsuite/special_functions/07_cyl_bessel_i/check_nan.cc
index ecde2469916..c1a6fab1692 100644
--- a/libstdc++-v3/testsuite/special_functions/07_cyl_bessel_i/check_nan.cc
+++ b/libstdc++-v3/testsuite/special_functions/07_cyl_bessel_i/check_nan.cc
@@ -2,6 +2,7 @@
 // { dg-require-c-std "" }
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/special_functions/08_cyl_bessel_j/check_nan.cc b/libstdc++-v3/testsuite/special_functions/08_cyl_bessel_j/check_nan.cc
index 967d9de7144..a9e02119bd2 100644
--- a/libstdc++-v3/testsuite/special_functions/08_cyl_bessel_j/check_nan.cc
+++ b/libstdc++-v3/testsuite/special_functions/08_cyl_bessel_j/check_nan.cc
@@ -2,6 +2,7 @@
 // { dg-require-c-std "" }
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/special_functions/09_cyl_bessel_k/check_nan.cc b/libstdc++-v3/testsuite/special_functions/09_cyl_bessel_k/check_nan.cc
index 27d2bfd05a9..03ae35a1614 100644
--- a/libstdc++-v3/testsuite/special_functions/09_cyl_bessel_k/check_nan.cc
+++ b/libstdc++-v3/testsuite/special_functions/09_cyl_bessel_k/check_nan.cc
@@ -2,6 +2,7 @@
 // { dg-require-c-std "" }
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/special_functions/10_cyl_neumann/check_nan.cc b/libstdc++-v3/testsuite/special_functions/10_cyl_neumann/check_nan.cc
index 9596e28d50b..9ae38918d1f 100644
--- a/libstdc++-v3/testsuite/special_functions/10_cyl_neumann/check_nan.cc
+++ b/libstdc++-v3/testsuite/special_functions/10_cyl_neumann/check_nan.cc
@@ -2,6 +2,7 @@
 // { dg-require-c-std "" }
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/special_functions/19_sph_bessel/check_nan.cc b/libstdc++-v3/testsuite/special_functions/19_sph_bessel/check_nan.cc
index 2d34b365540..35b18bf4028 100644
--- a/libstdc++-v3/testsuite/special_functions/19_sph_bessel/check_nan.cc
+++ b/libstdc++-v3/testsuite/special_functions/19_sph_bessel/check_nan.cc
@@ -2,6 +2,7 @@
 // { dg-require-c-std "" }
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/special_functions/21_sph_neumann/check_nan.cc b/libstdc++-v3/testsuite/special_functions/21_sph_neumann/check_nan.cc
index 691122d846e..8ab311347a4 100644
--- a/libstdc++-v3/testsuite/special_functions/21_sph_neumann/check_nan.cc
+++ b/libstdc++-v3/testsuite/special_functions/21_sph_neumann/check_nan.cc
@@ -2,6 +2,7 @@
 // { dg-require-c-std "" }
 // { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/08_cyl_bessel_i/check_nan.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/08_cyl_bessel_i/check_nan.cc
index 98e2fa0a8a7..e2227e06af4 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/08_cyl_bessel_i/check_nan.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/08_cyl_bessel_i/check_nan.cc
@@ -1,5 +1,6 @@
 // { dg-require-c-std "" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // 2007-01-10  Edward Smith-Rowland <3dw4rd@verizon.net>
 //
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/09_cyl_bessel_j/check_nan.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/09_cyl_bessel_j/check_nan.cc
index bd873ed7c8d..60deae8374e 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/09_cyl_bessel_j/check_nan.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/09_cyl_bessel_j/check_nan.cc
@@ -1,5 +1,6 @@
 // { dg-require-c-std "" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // 2007-01-10  Edward Smith-Rowland <3dw4rd@verizon.net>
 //
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/10_cyl_bessel_k/check_nan.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/10_cyl_bessel_k/check_nan.cc
index 307207b135e..22a8123e739 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/10_cyl_bessel_k/check_nan.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/10_cyl_bessel_k/check_nan.cc
@@ -1,5 +1,6 @@
 // { dg-require-c-std "" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // 2007-01-10  Edward Smith-Rowland <3dw4rd@verizon.net>
 //
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/11_cyl_neumann/check_nan.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/11_cyl_neumann/check_nan.cc
index 828b9a4539b..2fb8ae358d2 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/11_cyl_neumann/check_nan.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/11_cyl_neumann/check_nan.cc
@@ -1,5 +1,6 @@
 // { dg-require-c-std "" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // 2007-01-10  Edward Smith-Rowland <3dw4rd@verizon.net>
 //
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/21_sph_bessel/check_nan.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/21_sph_bessel/check_nan.cc
index c4ae0a2fc1e..4038de62438 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/21_sph_bessel/check_nan.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/21_sph_bessel/check_nan.cc
@@ -1,5 +1,6 @@
 // { dg-require-c-std "" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // 2007-01-10  Edward Smith-Rowland <3dw4rd@verizon.net>
 //
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/23_sph_neumann/check_nan.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/23_sph_neumann/check_nan.cc
index 230f0f956e1..89f89e5ecaf 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/23_sph_neumann/check_nan.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/23_sph_neumann/check_nan.cc
@@ -1,5 +1,6 @@
 // { dg-require-c-std "" }
 // { dg-add-options ieee }
+// { dg-prune-output ".*warning: tgammal has lower than advertised precision" }
 
 // 2007-01-10  Edward Smith-Rowland <3dw4rd@verizon.net>
 //