[svn-r27752] Merge of r27751 from 1.8 branch

Added a comment to config/ibm-flags that describes the purpose of the
-qflag=w:w compiler flag.

Tested on: N/A (no access to AIX, comment only)

config/ibm-flags

@@ -57,6 +57,9 @@ if test "XL" = "$cc_vendor"; then
     enable_shared="${enable_shared:-no}"
     # Make sure this is applied to other API compile options such as C++.
     AM_CFLAGS="$AM_CFLAGS"
+    # -qflag=w:w makes the lowest level of reported compile issues to be "warning"
+    # instead of "information". This suppresses a very large number of messages
+    # concerning the portability of __inline__.
     H5_CFLAGS="-qlanglvl=stdc99 -qflag=w:w $H5_CFLAGS"
     DEBUG_CFLAGS="-g -qfullpath"
     DEBUG_CPPFLAGS=