Define _LINUX_SOURCE_COMPAT for AIX build.

This takes care of the conflict between GTK+ headers and #define of func_data
in AIX sys/timer.h.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69625 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure

@@ -19583,10 +19583,14 @@ case "${host}" in
 esac
 
 
-if test "x$XLCXX" = "xyes" -a "x$USE_AIX" = "x1"; then
+if test "x$USE_AIX" = "x1"; then
+            if test "x$XLCXX" = "xyes"; then
         CXXFLAGS="-qunique $CXXFLAGS"
     fi
 
+                                CPPFLAGS="-D_LINUX_SOURCE_COMPAT $CPPFLAGS"
+fi
+
 case "${host}" in
   powerpc-*-darwin* )
     { echo "$as_me:$LINENO: checking if __POWERPC__ is already defined" >&5

configure.in

@@ -1384,12 +1384,23 @@ dnl ------------------------------------------------------------------------
 dnl Platform specific tests
 dnl ------------------------------------------------------------------------
 
+if test "x$USE_AIX" = "x1"; then
     dnl xlC needs -qunique under AIX so that one source file can be
     dnl compiled to multiple object files and safely linked together.
-if test "x$XLCXX" = "xyes" -a "x$USE_AIX" = "x1"; then
+    if test "x$XLCXX" = "xyes"; then
         CXXFLAGS="-qunique $CXXFLAGS"
     fi
 
+    dnl AIX sys/timer.h header #defines func_data as t_union.data breaking the
+    dnl compilation of GTK+ headers that use func_data as parameter name in
+    dnl several places. We could work around this by inserting "#undef
+    dnl func_data" in the code but IBM provides a possibility to disable this
+    dnl #define by pre-defining the symbol below and this seems to be simpler.
+    dnl And if we have any problems because of it we can always remove it and
+    dnl use the #undef approach.
+    CPPFLAGS="-D_LINUX_SOURCE_COMPAT $CPPFLAGS"
+fi
+
 dnl This case is for PowerPC OS X vs. everything else
 case "${host}" in
   powerpc-*-darwin* )