Fix problem on RHEL4U3 when compiling with the PGI 32 bit compiler:

<infiniband/driver.h> cannot be included because it will fail to
compile.  So per advice from Roland, in that case, just put manually
include the one ibv_*() prototype that we need.  Use an undocumented
feature of AC_CHECK_HEADERS to check for <infiniband/driver.h> that I
was told on the autoconf mailing list (see the comment for more
details).

This commit was SVN r19857.

config/ompi_check_openib.m4

@@ -187,6 +187,18 @@ AC_DEFUN([OMPI_CHECK_OPENIB],[
            fi
           ])
 
+    # Check to see if <infiniband/driver.h> works.  It is known to
+    # create problems on some platforms with some compilers (e.g.,
+    # RHEL4U3 with the PGI 32 bit compiler).  Use undocumented (in AC
+    # 2.63) feature of AC_CHECK_HEADERS: if you explicitly pass in
+    # AC_INCLUDES_DEFAULT as the 4th arg to AC_CHECK_HEADERS, the test
+    # will fail if the header is present but not compilable, *but it
+    # will not print the big scary warning*.  See
+    # http://lists.gnu.org/archive/html/autoconf/2008-10/msg00143.html.
+    AS_IF([test "$ompi_check_openib_happy" = "yes"],
+          [AC_CHECK_HEADERS([infiniband/driver.h], [], [], 
+                            [AC_INCLUDES_DEFAULT])])
+
     AC_MSG_CHECKING([if ConnectX XRC support is enabled])
     AC_DEFINE_UNQUOTED([OMPI_HAVE_CONNECTX_XRC], [$$1_have_xrc],
         [Enable features required for ConnectX XRC support])

ompi/mca/btl/openib/btl_openib_component.c

@@ -25,9 +25,19 @@
 #include "ompi_config.h"
 
 #include <infiniband/verbs.h>
+/* This is crummy, but <infiniband/driver.h> doesn't work on all
+   platforms with all compilers.  Specifically, trying to include it
+   on RHEL4U3 with the PGI 32 bit compiler will cause problems because
+   certain 64 bit types are not defined.  Per advice from Roland D.,
+   just include the one prototype that we need in this case
+   (ibv_get_sysfs_path()). */
+#ifdef HAVE_INFINIBAND_DRIVER_H
 #include <infiniband/driver.h>
+#else
+const char *ibv_get_sysfs_path(void);
+#endif
 #include <errno.h>
-#include <string.h>   /* for strerror()*/
+#include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>