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      1 # ld-output-def.m4 serial 2
      2 dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 dnl From Simon Josefsson
      8 
      9 # gl_LD_OUTPUT_DEF()
     10 # -------------
     11 # Check if linker supports -Wl,--output-def and define automake
     12 # conditional HAVE_LD_OUTPUT_DEF if it is.
     13 AC_DEFUN([gl_LD_OUTPUT_DEF],
     14 [
     15   AC_CACHE_CHECK([if gcc/ld supports -Wl,--output-def],
     16     [gl_cv_ld_output_def],
     17     [if test "$enable_shared" = no; then
     18        gl_cv_ld_output_def="not needed, shared libraries are disabled"
     19      else
     20        gl_ldflags_save=$LDFLAGS
     21        LDFLAGS="-Wl,--output-def,conftest.def"
     22        AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
     23                    [gl_cv_ld_output_def=yes],
     24                    [gl_cv_ld_output_def=no])
     25        rm -f conftest.def
     26        LDFLAGS="$gl_ldflags_save"
     27      fi])
     28   AM_CONDITIONAL([HAVE_LD_OUTPUT_DEF], test "x$gl_cv_ld_output_def" = "xyes")
     29 ])
     30