bug#12057: LT_DLSYM_CONST not defined

[Thien-Thi Nguyen]

Apparently, GNU Libtool 2.4 (2010-09-22) introduced ‘LT_DLSYM_CONST’
to ltdl.h, but that particular #define is requires "manual synching"
(according to this ltmain.sh excerpt):

  /* -*- c -*- /
  /* Keep this code in sync between libtool.m4, ltmain, lt_system.h, and tests. 
 */
  #if defined(_WIN32) || defined(__CYGWIN__) || defined(_WIN32_WCE)
  /* DATA imports from DLLs on WIN32 con't be const, because runtime
     relocations are performed -- see ld's documentation on pseudo-relocs.  */
  # define LT_DLSYM_CONST
  #elif defined(__osf__)
  /* This system does not cope well with relocations in const data.  */
  # define LT_DLSYM_CONST
  #else
  # define LT_DLSYM_CONST const
  #endif

In my code, i do:

  /* -*- c -*- /
  #include "libltdl/ltdl.h"

and this alone results in a "LT_DLSYM_CONST not defined" compilation
error.  However, adding that excerpt immediately prior to the #include
allows the compilation to succeed.  I presume what i've discovered is a
workaround at best and that there should be a better way to either avoid
this, or fully hide it from me (such that the plain old #include will be
sufficient, as before).  What would that way be?

-- 
Thien-Thi Nguyen                                       GPG key: 4C807502

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