1 files changed, 25 insertions, 0 deletions
diff --git a/tools/conf_tests/can_use_namespaces_inside_externc.cc b/tools/conf_tests/can_use_namespaces_inside_externc.cc
new file mode 100644
index 00000000..6d303cf0
--- /dev/null
+++ b/tools/conf_tests/can_use_namespaces_inside_externc.cc
@@ -0,0 +1,25 @@
+// Configuration-time test program, used in Meson build.
+// Check whether the compiler puts extern "C" functions in the global
+// namespace, even inside a namespace declaration. The AIX xlC compiler does
+// this, and also gets confused if we declare the namespace again inside the
+// extern "C" block.
+// Corresponds to the M4 macro GLIBMM_CXX_CAN_USE_NAMESPACES_INSIDE_EXTERNC.
+
+namespace test
+{
+
+extern "C" { void do_something(); }
+
+class Something
+{
+  int i;
+  friend void do_something();
+};
+
+void do_something()
+{
+  Something something;
+  something.i = 1;
+}
+
+} // namespace test