Added notes about Solaris Studio and Ubuntu. Also added check for gccfss being the compiler and abort configure if it is.

This commit was SVN r25903.

README

@@ -236,6 +236,16 @@ Compiler Notes
   Therefore  the make install fails.  So we suggest that one should
   use CXX=CC, which works, instead of CXX=sunCC.
 
+- If one tries to build OMPI on Ubuntu with Solaris Studio using the C++
+  compiler and the -m32 option  you might see a warning:
+  "CC: Warning: failed to detect system linker version, falling back to
+   custom linker usage"
+  Then the build will fail.  One can overcome this error by either 
+  setting LD_LIBRARY_PATH to the location of the 32 bit libraries (most
+  likely /lib32) or giving LDFLAGS="-L/lib32 -R/lib32" to the configure
+  command.  Officially Solaris Studio is not supported on Ubuntu Linux
+  distributions so additional problems might be incurred.
+
 - At least some versions of the Intel 8.1 compiler seg fault while
   compiling certain Open MPI source code files.  As such, it is not
   supported.

config/ompi_check_vendor.m4

@@ -10,6 +10,7 @@ dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 dnl                         University of Stuttgart.  All rights reserved.
 dnl Copyright (c) 2004-2005 The Regents of the University of California.
 dnl                         All rights reserved.
+dnl Copyright (c) 2012      Oracle and/or its affiliates.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -110,7 +111,25 @@ AC_DEFUN([_OMPI_CHECK_COMPILER_VENDOR], [
     # GNU
     AS_IF([test "$ompi_check_compiler_vendor_result" = "unknown"],
           [OMPI_IFDEF_IFELSE([__GNUC__], 
-               [ompi_check_compiler_vendor_result="gnu"])])
+               [ompi_check_compiler_vendor_result="gnu"
+
+               # We do not support gccfss as a compiler so die if 
+               # someone tries to use said compiler.  gccfss (gcc 
+               # for SPARC Systems) is a compiler that is no longer 
+               # supported by Oracle and it has some major flaws
+               # that prevents it from actually compiling OMPI code. 
+               # So if we detect it we automatically bail.
+
+               if ($CC --version | grep gccfss) >/dev/null 2>&1; then
+                   AC_MSG_RESULT([gccfss])
+                   AC_MSG_WARN([Detected gccfss being used to compile Open MPI.])
+                   AC_MSG_WARN([Because of several issues Open MPI does not support])
+                   AC_MSG_WARN([the gccfss compiler.  Please use a different compiler.])
+                   AC_MSG_WARN([If you didn't think you used gccfss you may want to])
+                   AC_MSG_WARN([check to see if the compiler you think you used is])
+                   AC_MSG_WARN([actually a link to gccfss.])
+                   AC_MSG_ERROR([Cannot continue])
+               fi])])
 
     # Borland Turbo C
     AS_IF([test "$ompi_check_compiler_vendor_result" = "unknown"],