BIND 10 #1558: configure.ac check for rpath -R flag

[BIND 10 Development]

#1558: configure.ac check for rpath -R flag
-------------------------------------+-------------------------------------
            Reporter:  jreed         |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  major         |                       Status:  new
           Component:  build system  |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  Core          |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 configure.ac has wrong code for checking if linked accepts -R flag. It
 assumes that the compiler has it, but
 g++ 4.6.2 on haikuo's system doesn't support it. It is a linker switch not
 a compiler switch.

 The existing autoconf code is:

 {{{

 # check -R rather than gcc specific -rpath to be as portable as possible.
 AC_MSG_CHECKING([whether -R flag is available in linker])
 LDFLAGS_SAVED="$LDFLAGS"
 LDFLAGS="$LDFLAGS -R/usr/lib"
 AC_TRY_LINK([],[],
         [ AC_MSG_RESULT(yes)
                 rpath_available=yes
         ],[ AC_MSG_RESULT(no)
         rpath_available=no
         ])
 LDFLAGS=$LDFLAGS_SAVED

 }}}

 Proper way for gcc is -Wl,-R, but SunStudio doesn't have that.

 The problem is that rpath_available=no causes -R not to be set so -R is
 not added and can't find dependency libraries in custom locations (as see
 on Haikuo's system).

-- 
Ticket URL: <http://bind10.isc.org/ticket/1558>
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