autoconf: Move export_dynamic determination to configure

Previously export_dynamic was set in src/makefiles/Makefile.$port. For solaris
this required exporting with_gnu_ld. The determination of with_gnu_ld would be
nontrivial to copy for meson PGXS compatibility.  It's also nice to delete
libtool.m4.

This uses -Wl,--export-dynamic on all platforms, previously all platforms but
FreeBSD used -Wl,-E. The likelihood of a name conflict seems lower with the
longer spelling.

Discussion: https://postgr.es/m/20221005200710.luvw5evhwf6clig6@awork3.anarazel.de

aclocal.m4

@@ -4,7 +4,6 @@ m4_include([config/c-compiler.m4])
 m4_include([config/c-library.m4])
 m4_include([config/check_decls.m4])
 m4_include([config/general.m4])
-m4_include([config/libtool.m4])
 m4_include([config/llvm.m4])
 m4_include([config/perl.m4])
 m4_include([config/pkg.m4])

config/c-compiler.m4

@@ -468,29 +468,38 @@ AC_DEFUN([PGAC_PROG_CXX_CFLAGS_OPT],
 
 
 
-# PGAC_PROG_CC_LDFLAGS_OPT
+# PGAC_PROG_CC_LD_VARFLAGS_OPT
 # ------------------------
 # Given a string, check if the compiler supports the string as a
-# command-line option. If it does, add the string to LDFLAGS.
+# command-line option. If it does, add to the given variable.
 # For reasons you'd really rather not know about, this checks whether
 # you can link to a particular function, not just whether you can link.
 # In fact, we must actually check that the resulting program runs :-(
-AC_DEFUN([PGAC_PROG_CC_LDFLAGS_OPT],
+AC_DEFUN([PGAC_PROG_CC_LD_VARFLAGS_OPT],
-[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_ldflags_$1])])dnl
+[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_$1_$2])])dnl
-AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
+AC_CACHE_CHECK([whether $CC supports $2, for $1], [Ac_cachevar],
 [pgac_save_LDFLAGS=$LDFLAGS
-LDFLAGS="$pgac_save_LDFLAGS $1"
+LDFLAGS="$pgac_save_LDFLAGS $2"
-AC_RUN_IFELSE([AC_LANG_PROGRAM([extern void $2 (); void (*fptr) () = $2;],[])],
+AC_RUN_IFELSE([AC_LANG_PROGRAM([extern void $3 (); void (*fptr) () = $3;],[])],
               [Ac_cachevar=yes],
               [Ac_cachevar=no],
               [Ac_cachevar="assuming no"])
 LDFLAGS="$pgac_save_LDFLAGS"])
 if test x"$Ac_cachevar" = x"yes"; then
-  LDFLAGS="$LDFLAGS $1"
+  $1="${$1} $2"
 fi
 undefine([Ac_cachevar])dnl
+])# PGAC_PROG_CC_LD_VARFLAGS_OPT
+
+# PGAC_PROG_CC_LDFLAGS_OPT
+# ------------------------
+# Convenience wrapper around PGAC_PROG_CC_LD_VARFLAGS_OPT that adds to
+# LDFLAGS.
+AC_DEFUN([PGAC_PROG_CC_LDFLAGS_OPT],
+[PGAC_PROG_CC_LD_VARFLAGS_OPT(LDFLAGS, [$1], [$2])
 ])# PGAC_PROG_CC_LDFLAGS_OPT
 
+
 # PGAC_HAVE_GCC__SYNC_CHAR_TAS
 # ----------------------------
 # Check if the C compiler understands __sync_lock_test_and_set(char),

config/libtool.m4

@@ -1,119 +0,0 @@
-## libtool.m4 - Configure libtool for the host system. -*-Shell-script-*-
-## Copyright (C) 1996-1999,2000 Free Software Foundation, Inc.
-## Originally by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996
-##
-## This program is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation; either version 2 of the License, or
-## (at your option) any later version.
-##
-## This program is distributed in the hope that it will be useful, but
-## WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-## General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with this program; if not, write to the Free Software
-## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-##
-## As a special exception to the GNU General Public License, if you
-## distribute this file as part of a program that contains a
-## configuration script generated by Autoconf, you may include it under
-## the same distribution terms that you use for the rest of that program.
-
-# No, PostgreSQL doesn't use libtool (yet), we just borrow stuff from it.
-# This file was taken on 2000-10-20 from the multi-language branch (since
-# that is the branch that PostgreSQL would most likely adopt anyway).
-# --petere
-
-# ... bunch of stuff removed here ...
-
-# PGAC_PROG_LD - find the path to the GNU or non-GNU linker
-AC_DEFUN([PGAC_PROG_LD],
-[AC_ARG_WITH(gnu-ld,
-[  --with-gnu-ld           assume the C compiler uses GNU ld [[default=no]]],
-test "$withval" = no || with_gnu_ld=yes, with_gnu_ld=no)
-AC_REQUIRE([AC_PROG_CC])dnl
-AC_REQUIRE([AC_CANONICAL_HOST])dnl
-dnl ###not for PostgreSQL### AC_REQUIRE([AC_CANONICAL_BUILD])dnl
-ac_prog=ld
-if test "$GCC" = yes; then
-  # Check if gcc -print-prog-name=ld gives a path.
-  AC_MSG_CHECKING([for ld used by GCC])
-  case $host in
-  *-*-mingw*)
-    # gcc leaves a trailing carriage return which upsets mingw
-    ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
-  *)
-    ac_prog=`($CC -print-prog-name=ld) 2>&5` ;;
-  esac
-  case "$ac_prog" in
-    # Accept absolute paths.
-changequote(,)dnl
-    [\\/]* | [A-Za-z]:[\\/]*)
-      re_direlt='/[^/][^/]*/\.\./'
-changequote([,])dnl
-      # Canonicalize the path of ld
-      ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
-      while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
-	ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
-      done
-      test -z "$LD" && LD="$ac_prog"
-      ;;
-  "")
-    # If it fails, then pretend we aren't using GCC.
-    ac_prog=ld
-    ;;
-  *)
-    # If it is relative, then search for the first ld in PATH.
-    with_gnu_ld=unknown
-    ;;
-  esac
-elif test "$with_gnu_ld" = yes; then
-  AC_MSG_CHECKING([for GNU ld])
-else
-  AC_MSG_CHECKING([for non-GNU ld])
-fi
-AC_CACHE_VAL(ac_cv_path_LD,
-[if test -z "$LD"; then
-  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
-  for ac_dir in $PATH; do
-    test -z "$ac_dir" && ac_dir=.
-    if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
-      ac_cv_path_LD="$ac_dir/$ac_prog"
-      # Check to see if the program is GNU ld.  I'd rather use --version,
-      # but apparently some GNU ld's only accept -v.
-      # Break only if it was the GNU/non-GNU ld that we prefer.
-      if "$ac_cv_path_LD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
-	test "$with_gnu_ld" != no && break
-      else
-	test "$with_gnu_ld" != yes && break
-      fi
-    fi
-  done
-  IFS="$ac_save_ifs"
-else
-  ac_cv_path_LD="$LD" # Let the user override the test with a path.
-fi])
-LD="$ac_cv_path_LD"
-if test -n "$LD"; then
-  AC_MSG_RESULT($LD)
-else
-  AC_MSG_RESULT(no)
-fi
-test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
-PGAC_PROG_LD_GNU
-])
-
-AC_DEFUN([PGAC_PROG_LD_GNU],
-[AC_CACHE_CHECK([if the linker ($LD) is GNU ld], ac_cv_prog_gnu_ld,
-[# I'd rather use --version here, but apparently some GNU ld's only accept -v.
-if $LD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
-  ac_cv_prog_gnu_ld=yes
-else
-  ac_cv_prog_gnu_ld=no
-fi])
-with_gnu_ld=$ac_cv_prog_gnu_ld
-])
-
-# ... more stuff removed ...

configure

@@ -629,6 +629,7 @@ ac_subst_vars='LTLIBOBJS
 vpath_build
 PG_SYSROOT
 PG_VERSION_NUM
+LDFLAGS_EX_BE
 PROVE
 DBTOEPUB
 FOP
@@ -692,7 +693,6 @@ AR
 STRIP_SHARED_LIB
 STRIP_STATIC_LIB
 STRIP
-with_gnu_ld
 LDFLAGS_SL
 LDFLAGS_EX
 ZSTD_LIBS
@@ -871,7 +871,6 @@ with_system_tzdata
 with_zlib
 with_lz4
 with_zstd
-with_gnu_ld
 with_ssl
 with_openssl
 enable_largefile
@@ -1582,7 +1581,6 @@ Optional Packages:
   --without-zlib          do not use Zlib
   --with-lz4              build with LZ4 support
   --with-zstd             build with ZSTD support
-  --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
   --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
@@ -9545,105 +9543,6 @@ LDFLAGS="$LDFLAGS $LIBDIRS"
 
 
 
-# Check whether --with-gnu-ld was given.
-if test "${with_gnu_ld+set}" = set; then :
-  withval=$with_gnu_ld; test "$withval" = no || with_gnu_ld=yes
-else
-  with_gnu_ld=no
-fi
-
-ac_prog=ld
-if test "$GCC" = yes; then
-  # Check if gcc -print-prog-name=ld gives a path.
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ld used by GCC" >&5
-$as_echo_n "checking for ld used by GCC... " >&6; }
-  case $host in
-  *-*-mingw*)
-    # gcc leaves a trailing carriage return which upsets mingw
-    ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
-  *)
-    ac_prog=`($CC -print-prog-name=ld) 2>&5` ;;
-  esac
-  case "$ac_prog" in
-    # Accept absolute paths.
-    [\\/]* | [A-Za-z]:[\\/]*)
-      re_direlt='/[^/][^/]*/\.\./'
-      # Canonicalize the path of ld
-      ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
-      while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
-	ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
-      done
-      test -z "$LD" && LD="$ac_prog"
-      ;;
-  "")
-    # If it fails, then pretend we aren't using GCC.
-    ac_prog=ld
-    ;;
-  *)
-    # If it is relative, then search for the first ld in PATH.
-    with_gnu_ld=unknown
-    ;;
-  esac
-elif test "$with_gnu_ld" = yes; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GNU ld" >&5
-$as_echo_n "checking for GNU ld... " >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for non-GNU ld" >&5
-$as_echo_n "checking for non-GNU ld... " >&6; }
-fi
-if ${ac_cv_path_LD+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test -z "$LD"; then
-  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
-  for ac_dir in $PATH; do
-    test -z "$ac_dir" && ac_dir=.
-    if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
-      ac_cv_path_LD="$ac_dir/$ac_prog"
-      # Check to see if the program is GNU ld.  I'd rather use --version,
-      # but apparently some GNU ld's only accept -v.
-      # Break only if it was the GNU/non-GNU ld that we prefer.
-      if "$ac_cv_path_LD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
-	test "$with_gnu_ld" != no && break
-      else
-	test "$with_gnu_ld" != yes && break
-      fi
-    fi
-  done
-  IFS="$ac_save_ifs"
-else
-  ac_cv_path_LD="$LD" # Let the user override the test with a path.
-fi
-fi
-
-LD="$ac_cv_path_LD"
-if test -n "$LD"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $LD" >&5
-$as_echo "$LD" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-test -z "$LD" && as_fn_error $? "no acceptable ld found in \$PATH" "$LINENO" 5
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if the linker ($LD) is GNU ld" >&5
-$as_echo_n "checking if the linker ($LD) is GNU ld... " >&6; }
-if ${ac_cv_prog_gnu_ld+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  # I'd rather use --version here, but apparently some GNU ld's only accept -v.
-if $LD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
-  ac_cv_prog_gnu_ld=yes
-else
-  ac_cv_prog_gnu_ld=no
-fi
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_gnu_ld" >&5
-$as_echo "$ac_cv_prog_gnu_ld" >&6; }
-with_gnu_ld=$ac_cv_prog_gnu_ld
-
-
-
-
   if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}strip", so it can be a program name with args.
 set dummy ${ac_tool_prefix}strip; ac_word=$2
@@ -19213,15 +19112,15 @@ else
 fi
 
 if test "$PORTNAME" = "darwin"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,-dead_strip_dylibs" >&5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,-dead_strip_dylibs, for LDFLAGS" >&5
-$as_echo_n "checking whether $CC supports -Wl,-dead_strip_dylibs... " >&6; }
+$as_echo_n "checking whether $CC supports -Wl,-dead_strip_dylibs, for LDFLAGS... " >&6; }
-if ${pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs+:} false; then :
+if ${pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   pgac_save_LDFLAGS=$LDFLAGS
 LDFLAGS="$pgac_save_LDFLAGS -Wl,-dead_strip_dylibs"
 if test "$cross_compiling" = yes; then :
-  pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs="assuming no"
+  pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs="assuming no"
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -19235,9 +19134,9 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-  pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs=yes
+  pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs=yes
 else
-  pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs=no
+  pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs=no
 fi
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
   conftest.$ac_objext conftest.beam conftest.$ac_ext
@@ -19245,22 +19144,23 @@ fi
 
 LDFLAGS="$pgac_save_LDFLAGS"
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs" >&5
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs" >&5
-$as_echo "$pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs" >&6; }
+$as_echo "$pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs" >&6; }
-if test x"$pgac_cv_prog_cc_ldflags__Wl__dead_strip_dylibs" = x"yes"; then
+if test x"$pgac_cv_prog_cc_LDFLAGS__Wl__dead_strip_dylibs" = x"yes"; then
-  LDFLAGS="$LDFLAGS -Wl,-dead_strip_dylibs"
+  LDFLAGS="${LDFLAGS} -Wl,-dead_strip_dylibs"
 fi
 
+
 elif test "$PORTNAME" = "openbsd"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,-Bdynamic" >&5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,-Bdynamic, for LDFLAGS" >&5
-$as_echo_n "checking whether $CC supports -Wl,-Bdynamic... " >&6; }
+$as_echo_n "checking whether $CC supports -Wl,-Bdynamic, for LDFLAGS... " >&6; }
-if ${pgac_cv_prog_cc_ldflags__Wl__Bdynamic+:} false; then :
+if ${pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   pgac_save_LDFLAGS=$LDFLAGS
 LDFLAGS="$pgac_save_LDFLAGS -Wl,-Bdynamic"
 if test "$cross_compiling" = yes; then :
-  pgac_cv_prog_cc_ldflags__Wl__Bdynamic="assuming no"
+  pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic="assuming no"
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -19274,9 +19174,9 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-  pgac_cv_prog_cc_ldflags__Wl__Bdynamic=yes
+  pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic=yes
 else
-  pgac_cv_prog_cc_ldflags__Wl__Bdynamic=no
+  pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic=no
 fi
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
   conftest.$ac_objext conftest.beam conftest.$ac_ext
@@ -19284,22 +19184,23 @@ fi
 
 LDFLAGS="$pgac_save_LDFLAGS"
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_ldflags__Wl__Bdynamic" >&5
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic" >&5
-$as_echo "$pgac_cv_prog_cc_ldflags__Wl__Bdynamic" >&6; }
+$as_echo "$pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic" >&6; }
-if test x"$pgac_cv_prog_cc_ldflags__Wl__Bdynamic" = x"yes"; then
+if test x"$pgac_cv_prog_cc_LDFLAGS__Wl__Bdynamic" = x"yes"; then
-  LDFLAGS="$LDFLAGS -Wl,-Bdynamic"
+  LDFLAGS="${LDFLAGS} -Wl,-Bdynamic"
 fi
 
+
 else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,--as-needed" >&5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,--as-needed, for LDFLAGS" >&5
-$as_echo_n "checking whether $CC supports -Wl,--as-needed... " >&6; }
+$as_echo_n "checking whether $CC supports -Wl,--as-needed, for LDFLAGS... " >&6; }
-if ${pgac_cv_prog_cc_ldflags__Wl___as_needed+:} false; then :
+if ${pgac_cv_prog_cc_LDFLAGS__Wl___as_needed+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   pgac_save_LDFLAGS=$LDFLAGS
 LDFLAGS="$pgac_save_LDFLAGS -Wl,--as-needed"
 if test "$cross_compiling" = yes; then :
-  pgac_cv_prog_cc_ldflags__Wl___as_needed="assuming no"
+  pgac_cv_prog_cc_LDFLAGS__Wl___as_needed="assuming no"
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -19313,9 +19214,9 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-  pgac_cv_prog_cc_ldflags__Wl___as_needed=yes
+  pgac_cv_prog_cc_LDFLAGS__Wl___as_needed=yes
 else
-  pgac_cv_prog_cc_ldflags__Wl___as_needed=no
+  pgac_cv_prog_cc_LDFLAGS__Wl___as_needed=no
 fi
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
   conftest.$ac_objext conftest.beam conftest.$ac_ext
@@ -19323,14 +19224,58 @@ fi
 
 LDFLAGS="$pgac_save_LDFLAGS"
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_ldflags__Wl___as_needed" >&5
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_LDFLAGS__Wl___as_needed" >&5
-$as_echo "$pgac_cv_prog_cc_ldflags__Wl___as_needed" >&6; }
+$as_echo "$pgac_cv_prog_cc_LDFLAGS__Wl___as_needed" >&6; }
-if test x"$pgac_cv_prog_cc_ldflags__Wl___as_needed" = x"yes"; then
+if test x"$pgac_cv_prog_cc_LDFLAGS__Wl___as_needed" = x"yes"; then
-  LDFLAGS="$LDFLAGS -Wl,--as-needed"
+  LDFLAGS="${LDFLAGS} -Wl,--as-needed"
 fi
 
+
 fi
 
+# For linkers that understand --export-dynamic, add that to the LDFLAGS_EX_BE
+# (backend specific ldflags). One some platforms this will always fail (e.g.,
+# windows), but on others it depends on the choice of linker (e.g., solaris).
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wl,--export-dynamic, for LDFLAGS_EX_BE" >&5
+$as_echo_n "checking whether $CC supports -Wl,--export-dynamic, for LDFLAGS_EX_BE... " >&6; }
+if ${pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  pgac_save_LDFLAGS=$LDFLAGS
+LDFLAGS="$pgac_save_LDFLAGS -Wl,--export-dynamic"
+if test "$cross_compiling" = yes; then :
+  pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic="assuming no"
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+extern void $link_test_func (); void (*fptr) () = $link_test_func;
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+  pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic=yes
+else
+  pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+LDFLAGS="$pgac_save_LDFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic" >&5
+$as_echo "$pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic" >&6; }
+if test x"$pgac_cv_prog_cc_LDFLAGS_EX_BE__Wl___export_dynamic" = x"yes"; then
+  LDFLAGS_EX_BE="${LDFLAGS_EX_BE} -Wl,--export-dynamic"
+fi
+
+
+
 # Create compiler version string
 if test x"$GCC" = x"yes" ; then
   cc_string=`${CC} --version | sed q`

configure.ac

@@ -1131,8 +1131,6 @@ LDFLAGS="$LDFLAGS $LIBDIRS"
 AC_ARG_VAR(LDFLAGS_EX, [extra linker flags for linking executables only])
 AC_ARG_VAR(LDFLAGS_SL, [extra linker flags for linking shared libraries only])
 
-PGAC_PROG_LD
-AC_SUBST(with_gnu_ld)
 PGAC_CHECK_STRIP
 AC_CHECK_TOOL(AR, ar, ar)
 if test "$PORTNAME" = "win32"; then
@@ -2372,6 +2370,12 @@ else
   PGAC_PROG_CC_LDFLAGS_OPT([-Wl,--as-needed], $link_test_func)
 fi
 
+# For linkers that understand --export-dynamic, add that to the LDFLAGS_EX_BE
+# (backend specific ldflags). One some platforms this will always fail (e.g.,
+# windows), but on others it depends on the choice of linker (e.g., solaris).
+PGAC_PROG_CC_LD_VARFLAGS_OPT(LDFLAGS_EX_BE, [-Wl,--export-dynamic], $link_test_func)
+AC_SUBST(LDFLAGS_EX_BE)
+
 # Create compiler version string
 if test x"$GCC" = x"yes" ; then
   cc_string=`${CC} --version | sed q`

src/Makefile.global.in

@@ -289,7 +289,6 @@ LDAP_LIBS_FE = @LDAP_LIBS_FE@
 LDAP_LIBS_BE = @LDAP_LIBS_BE@
 UUID_LIBS = @UUID_LIBS@
 LLVM_LIBS=@LLVM_LIBS@
-with_gnu_ld = @with_gnu_ld@
 
 # It's critical that within LDFLAGS, all -L switches pointing to build-tree
 # directories come before any -L switches pointing to external directories.
@@ -313,6 +312,7 @@ endif
 LDFLAGS = $(LDFLAGS_INTERNAL) @LDFLAGS@
 
 LDFLAGS_EX = @LDFLAGS_EX@
+LDFLAGS_EX_BE = @LDFLAGS_EX_BE@
 # LDFLAGS_SL might have already been assigned by calling makefile
 LDFLAGS_SL += @LDFLAGS_SL@
 WINDRES = @WINDRES@

src/backend/Makefile

@@ -55,6 +55,8 @@ ifeq ($(with_systemd),yes)
 LIBS += -lsystemd
 endif
 
+override LDFLAGS := $(LDFLAGS) $(LDFLAGS_EX) $(LDFLAGS_EX_BE)
+
 ##########################################################################
 
 all: submake-libpgport submake-catalog-headers submake-utils-headers postgres $(POSTGRES_IMP)
@@ -64,7 +66,7 @@ ifneq ($(PORTNAME), win32)
 ifneq ($(PORTNAME), aix)
 
 postgres: $(OBJS)
-	$(CC) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) $(LIBS) -o $@
+	$(CC) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LIBS) -o $@
 
 endif
 endif
@@ -73,7 +75,7 @@ endif
 ifeq ($(PORTNAME), cygwin)
 
 postgres: $(OBJS)
-	$(CC) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) -Wl,--stack,$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@
+	$(CC) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) -Wl,--stack,$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@
 
 # libpostgres.a is actually built in the preceding rule, but we need this to
 # ensure it's newer than postgres; see notes in src/backend/parser/Makefile
@@ -86,7 +88,7 @@ ifeq ($(PORTNAME), win32)
 LIBS += -lsecur32
 
 postgres: $(OBJS) $(WIN32RES)
-	$(CC) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(WIN32RES) $(LDFLAGS) $(LDFLAGS_EX) -Wl,--stack=$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@$(X)
+	$(CC) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(WIN32RES) $(LDFLAGS) -Wl,--stack=$(WIN32_STACK_RLIMIT) -Wl,--export-all-symbols -Wl,--out-implib=libpostgres.a $(LIBS) -o $@$(X)
 
 # libpostgres.a is actually built in the preceding rule, but we need this to
 # ensure it's newer than postgres; see notes in src/backend/parser/Makefile
@@ -98,7 +100,7 @@ endif # win32
 ifeq ($(PORTNAME), aix)
 
 postgres: $(POSTGRES_IMP)
-	$(CC) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(LDFLAGS) $(LDFLAGS_EX) -Wl,-bE:$(top_builddir)/src/backend/$(POSTGRES_IMP) $(LIBS) -Wl,-brtllib -o $@
+	$(CC) $(CFLAGS) $(call expand_subsys,$(OBJS)) $(LDFLAGS) -Wl,-bE:$(top_builddir)/src/backend/$(POSTGRES_IMP) $(LIBS) -Wl,-brtllib -o $@
 
 # Linking to a single .o with -r is a lot faster than building a .a or passing
 # all objects to MKLDEXPORT.
@@ -320,4 +322,4 @@ maintainer-clean: distclean
 # are up to date.  It saves the time of doing all the submakes.
 .PHONY: quick
 quick: $(OBJS)
-	$(CC) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LDFLAGS_EX) $(export_dynamic) $(LIBS) -o postgres
+	$(CC) $(CFLAGS) $(call expand_subsys,$^) $(LDFLAGS) $(LIBS) -o postgres

src/makefiles/Makefile.freebsd

@@ -1,4 +1,3 @@
-export_dynamic = -Wl,-export-dynamic
 rpath = -Wl,-R'$(rpathdir)'
 
 # extra stuff for $(with_temp_install)

src/makefiles/Makefile.linux

@@ -1,4 +1,3 @@
-export_dynamic = -Wl,-E
 # Use --enable-new-dtags to generate DT_RUNPATH instead of DT_RPATH.
 # This allows LD_LIBRARY_PATH to still work when needed.
 rpath = -Wl,-rpath,'$(rpathdir)',--enable-new-dtags

src/makefiles/Makefile.netbsd

@@ -1,4 +1,3 @@
-export_dynamic = -Wl,-E
 rpath = -Wl,-R'$(rpathdir)'
 
 

src/makefiles/Makefile.openbsd

@@ -1,4 +1,3 @@
-export_dynamic = -Wl,-E
 rpath = -Wl,-R'$(rpathdir)'
 
 

src/makefiles/Makefile.solaris

@@ -1,10 +1,6 @@
 # src/makefiles/Makefile.solaris
 rpath = -Wl,-rpath,'$(rpathdir)'
 
-ifeq ($(with_gnu_ld), yes)
-export_dynamic = -Wl,-E
-endif
-
 # Rule for building a shared library from a single .o file
 %.so: %.o
 	$(CC) $(CFLAGS) $< $(LDFLAGS) $(LDFLAGS_SL) -shared -o $@