diff --git a/libcxx/test/libcxx/debug/extern-templates.sh.cpp b/libcxx/test/libcxx/debug/extern-templates.sh.cpp
--- a/libcxx/test/libcxx/debug/extern-templates.sh.cpp
+++ b/libcxx/test/libcxx/debug/extern-templates.sh.cpp
@@ -21,10 +21,8 @@
 // option which clang doesn't accept on Windows.)
 // UNSUPPORTED: windows
 
-// XFAIL: LIBCXX-AIX-FIXME
-
-// RUN: %{cxx} %{flags} %{compile_flags} %s %{link_flags} -fPIC -DTU1 -D_LIBCPP_DEBUG=1 -fvisibility=hidden -shared -o %t.lib
-// RUN: cd %T && %{cxx} %{flags} %{compile_flags} %s ./%basename_t.tmp.lib %{link_flags} -DTU2 -D_LIBCPP_DEBUG=1 -fvisibility=hidden -o %t.exe
+// RUN: %{cxx} %{flags} %{compile_flags} %s %{link_flags} -fPIC -DTU1 -D_LIBCPP_DEBUG=1 %{hiddenvisibility} -shared -o %t.lib
+// RUN: cd %T && %{cxx} %{flags} %{compile_flags} %s ./%basename_t.tmp.lib %{link_flags} -DTU2 -D_LIBCPP_DEBUG=1 %{hiddenvisibility} -o %t.exe
 // RUN: %{exec} %t.exe
 
 #include <cassert>
diff --git a/libcxx/utils/libcxx/test/features.py b/libcxx/utils/libcxx/test/features.py
--- a/libcxx/utils/libcxx/test/features.py
+++ b/libcxx/utils/libcxx/test/features.py
@@ -85,6 +85,13 @@
           }
           """)),
 
+  # Substitue the hidden visibility to empty string if unsupported.
+  Feature(name='hidden-visibility-if-support',
+          actions=lambda cfg:
+          [AddSubstitution('%{hiddenvisibility}', '-fvisibility=hidden')]
+          if hasCompileFlag(cfg, '-fvisibility=hidden') else
+          [AddSubstitution('%{hiddenvisibility}', '')]),
+
   # Whether Bash can run on the executor.
   # This is not always the case, for example when running on embedded systems.
   #