# lib-ld.m4 serial 7

dnl Copyright (C) 1996-2003, 2009-2017 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl Subroutines of libtool.m4,

dnl with replacements s/_*LT_PATH/AC_LIB_PROG/ and s/lt_/acl_/ to avoid

dnl collision with libtool.m4.

dnl From libtool-2.4. Sets the variable with_gnu_ld to yes or no.

AC_DEFUN([AC_LIB_PROG_LD_GNU],

[AC_CACHE_CHECK([if the linker ($LD) is GNU ld], [acl_cv_prog_gnu_ld],

[# I'd rather use --version here, but apparently some GNU lds only accept -v.

case `$LD -v 2>&1 

*GNU* | *'with BFD'*)

  acl_cv_prog_gnu_ld=yes

  ;;

*)

  acl_cv_prog_gnu_ld=no

  ;;

esac])

with_gnu_ld=$acl_cv_prog_gnu_ld

])

dnl From libtool-2.4. Sets the variable LD.

AC_DEFUN([AC_LIB_PROG_LD],

[AC_REQUIRE([AC_PROG_CC])dnl

AC_REQUIRE([AC_CANONICAL_HOST])dnl

AC_ARG_WITH([gnu-ld],

    [AS_HELP_STRING([--with-gnu-ld],

        [assume the C compiler uses GNU ld [default=no]])],

    [test "$withval" = no || with_gnu_ld=yes],

    [with_gnu_ld=no])dnl

# Prepare PATH_SEPARATOR.

# The user is always right.

if test "${PATH_SEPARATOR+set}" != set; then

  # Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which

  # contains only /bin. Note that ksh looks also at the FPATH variable,

  # so we have to set that as well for the test.

  PATH_SEPARATOR=:

  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \

    && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \

           || PATH_SEPARATOR=';'

       }

fi

if test -n "$LD"; then

  AC_MSG_CHECKING([for ld])

elif test "$GCC" = yes; then

  AC_MSG_CHECKING([for ld used by $CC])

elif test "$with_gnu_ld" = yes; then

  AC_MSG_CHECKING([for GNU ld])

else

  AC_MSG_CHECKING([for non-GNU ld])

fi

if test -n "$LD"; then

  # Let the user override the test with a path.

  :

else

  AC_CACHE_VAL([acl_cv_path_LD],

  [

    acl_cv_path_LD= # Final result of this test

    ac_prog=ld # Program to search in $PATH

    if test "$GCC" = yes; then

      # Check if gcc -print-prog-name=ld gives a path.

      case $host in

        *-*-mingw*)

          # gcc leaves a trailing carriage return which upsets mingw

          acl_output=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;

        *)

          acl_output=`($CC -print-prog-name=ld) 2>&5` ;;

      esac

      case $acl_output in

        # Accept absolute paths.

        [[\\/]]* | ?:[[\\/]]*)

          re_direlt='/[[^/]][[^/]]*/\.\./'

          # Canonicalize the pathname of ld

          acl_output=`echo "$acl_output" | sed 's%\\\\%/%g'`

          while echo "$acl_output" | grep "$re_direlt" > /dev/null 2>&1; do

            acl_output=`echo $acl_output | sed "s%$re_direlt%/%"`

          done

          # Got the pathname. No search in PATH is needed.

          acl_cv_path_LD="$acl_output"

          ac_prog=

          ;;

        "")

          # If it fails, then pretend we aren't using GCC.

          ;;

        *)

          # If it is relative, then search for the first ld in PATH.

          with_gnu_ld=unknown

          ;;

      esac

    fi

    if test -n "$ac_prog"; then

      # Search for $ac_prog in $PATH.

      acl_save_ifs="$IFS"; IFS=$PATH_SEPARATOR

      for ac_dir in $PATH; do

        IFS="$acl_save_ifs"

        test -z "$ac_dir" && ac_dir=.

        if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then

          acl_cv_path_LD="$ac_dir/$ac_prog"

          # Check to see if the program is GNU ld.  I'd rather use --version,

          # but apparently some variants of GNU ld only accept -v.

          # Break only if it was the GNU/non-GNU ld that we prefer.

          case `"$acl_cv_path_LD" -v 2>&1 

            *GNU* | *'with BFD'*)

              test "$with_gnu_ld" != no && break

              ;;

            *)

              test "$with_gnu_ld" != yes && break

              ;;

          esac

        fi

      done

      IFS="$acl_save_ifs"

    fi

    case $host in

      *-*-aix*)

        AC_EGREP_CPP([yes],

          [#if defined __powerpc64__ || defined _ARCH_PPC64

           yes

           #endif

          ],

          [# The compiler produces 64-bit code. Add option '-b64' so that the

           # linker groks 64-bit object files.

           case "$acl_cv_path_LD " in

             *" -b64 "*) ;;

             *) acl_cv_path_LD="$acl_cv_path_LD -b64" ;;

           esac

          ], [])

        ;;

    esac

  ])

  LD="$acl_cv_path_LD"

fi

if test -n "$LD"; then

  AC_MSG_RESULT([$LD])

else

  AC_MSG_RESULT([no])

  AC_MSG_ERROR([no acceptable ld found in \$PATH])

fi

AC_LIB_PROG_LD_GNU

])