OTP-8323 Cross compilation improvements and other build system

          improvements.

          Most notable:

          Lots of cross compilation improvements. The old cross compilation
          support was more or less non-existing as well as broken. Please,
          note that the cross compilation support should still be
          considered as experimental. Also note that old cross compilation
          configurations cannot be used without modifications. For more
          information on cross compiling Erlang/OTP see the
          $ERL_TOP/xcomp/README file.

          Support for staged install using <url
          href="http://www.gnu.org/prep/standards/html_node/DESTDIR.html">D
          ESTDIR</url>. The old broken INSTALL_PREFIX has also been fixed.
          For more information see the $ERL_TOP/README file.

          Documentation of the release target of the top Makefile. For more
          information see the $ERL_TOP/README file.

          make install now by default creates relative symbolic links
          instead of absolute ones. For more information see the
          $ERL_TOP/README file.

          $ERL_TOP/configure --help=recursive now works and prints help for
          all applications with configure scripts.

          Doing make install, or make release directly after make all no
          longer triggers miscellaneous rebuilds.

          Existing bootstrap system is now used when doing make install, or
          make release without a preceding make all.

          The crypto and ssl applications use the same runtime library path
          when dynamically linking against libssl.so and libcrypto.so. The
          runtime library search path has also been extended.

          The configure scripts of erl_interface and odbc now search for
          thread libraries and thread library quirks the same way as erts
          do.

          The configure script of the odbc application now also looks for
          odbc libraries in lib64 and lib/64 directories when building on a
          64-bit system.

          The config.h.in file in the erl_interface application is now
          automatically generated in instead of statically updated which
          reduces the risk of configure tests without any effect.

1 files changed, 64 insertions, 49 deletions

diff --git a/lib/megaco/configure.in b/lib/megaco/configure.in
index 297d618369..8f94a4efcf 100644
--- a/lib/megaco/configure.in
+++ b/lib/megaco/configure.in
@@ -1,20 +1,20 @@
 dnl Process this file with autoconf to produce a configure script. -*-m4-*-
 dnl
 dnl %CopyrightBegin%
-dnl 
-dnl Copyright Ericsson AB 2001-2009. All Rights Reserved.
-dnl 
+dnl
+dnl Copyright Ericsson AB 2001-2010. All Rights Reserved.
+dnl
 dnl The contents of this file are subject to the Erlang Public License,
 dnl Version 1.1, (the "License"); you may not use this file except in
 dnl compliance with the License. You should have received a copy of the
 dnl Erlang Public License along with this software. If not, it can be
 dnl retrieved online at http://www.erlang.org/.
-dnl 
+dnl
 dnl Software distributed under the License is distributed on an "AS IS"
 dnl basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 dnl the License for the specific language governing rights and limitations
 dnl under the License.
-dnl 
+dnl
 dnl %CopyrightEnd%
 dnl
 
@@ -145,12 +145,14 @@ AC_ARG_ENABLE(megaco_flex_scanner_lineno,
 AC_SUBST(ENABLE_MEGACO_FLEX_SCANNER_LINENO)
 
 
+dnl This is the os flavour, should be unix, vxworks or win32
+if test "X$host" = "Xwin32"; then
+	ERLANG_OSTYPE=win32
+else
+	ERLANG_OSTYPE=unix
+fi
 
-dnl
-dnl C compiler (related) defs
-dnl
-
-AC_PROG_CC
+AC_SUBST(ERLANG_OSTYPE)
 
 dnl Magic test for clearcase.
 if test -d ../../system; then
@@ -158,33 +160,55 @@ if test -d ../../system; then
 else
 	OTP_EXTRA_FLAGS=
 fi
+AC_SUBST(OTP_EXTRA_FLAGS)
+
+dnl
+dnl If ${ERL_TOP}/make/otp_ded.mk.in exists and contains DED_MK_VSN > 0,
+dnl every thing releted to compiling Dynamic Erlang Drivers can be found
+dnl in $(ERL_TOP)/make/$(TARGET)/ded.mk at compile time. If not, try to
+dnl figure these things out.
+dnl
+
+AC_MSG_CHECKING([for usable Dynamic Erlang Driver configuration])
+[
+  ded_mk_in="${ERL_TOP}/make/otp_ded.mk.in"
+  ded_mk_vsn=
+  test -r "$ded_mk_in" &&
+    ded_mk_vsn=`sed -n "s/^DED_MK_VSN[	 ]*=[	 ]*\(.*\)/\1/p" < "$ded_mk_in"`
+  test "$ded_mk_vsn" != "" || ded_mk_vsn=0
+]
+
+if test $ded_mk_vsn -gt 0; then
+
+HAVE_USABLE_OTP_DED_MK=yes
+AC_MSG_RESULT([yes])
 
+CC=false
+AC_SUBST(CC)
+DED_LD=false
+AC_SUBST(DED_LD)
+
+else dnl --- begin no usable otp_ded.mk.in ---
+
+HAVE_USABLE_OTP_DED_MK=no
+AC_MSG_RESULT([no])
 
 dnl
-dnl The ErlDrvEntry struct changed in R13 (another field)
+dnl C compiler (related) defs
 dnl
-AC_CHECK_MEMBERS([struct ErlDrvEntry.stop_select], 
-                 [
-                  CFLAGS="$CFLAGS -DMEGACO_DRV_ENTRY_HAS_STOP_SELECT"
-                 ], 
-                 [],
-                 [
-                  #include "erl_driver.h"
-                 ])
 
+AC_PROG_CC
 
 dnl
 dnl Flags to the C compiler
 dnl
-dnl make sure we find config.h
-CFLAGS="$CFLAGS -I${ERL_TOP}/erts/$host -I${ERL_TOP}/erts/include/$host $OTP_EXTRA_FLAGS"
 
 if test "X$host" = "Xwin32"; then
   DED_CFLAGS="$CFLAGS"
 else
   case $host_os in
     darwin*)
-	CFLAGS="$CFLAGS -no-cpp-precomp"
+	CFLAGS="$CFLAGS -no-cpp-precomp -fno-common"
 	;;
   esac
 
@@ -196,22 +220,10 @@ else
 fi
 
 dnl emulator includes needed
-DED_INCLUDE="-I${ERL_TOP}/erts/emulator/beam -I${ERL_TOP}/erts/include -I${ERL_TOP}/erts/include/$host"
-
-DED_CFLAGS="$DED_INCLUDE $DED_CFLAGS"
-
-
+DED_INCLUDES="-I${ERL_TOP}/erts/emulator/beam -I${ERL_TOP}/erts/include -I${ERL_TOP}/erts/include/$host -I${ERL_TOP}/erts/include/internal -I${ERL_TOP}/erts/include/internal/$host -I${ERL_TOP}/erts/emulator/sys/$ERLANG_OSTYPE"
 
-AC_SUBST(DED_CFLAGS)
-
-
-AC_CHECK_PROGS(DED_LD, [ld.sh ld], no_ld)
-if test "$DED_LD" = no_ld; then
-  AC_MSG_ERROR([ld is required to build the flex scanner!])
-fi
+DED_THR_DEFS="-D_THREAD_SAFE -D_REENTRANT"
 
-
-AC_MSG_CHECKING(for linker flags for loadable drivers)
 case $host_os in
 	win32)
 		DED_LDFLAGS="-dll"
@@ -230,33 +242,36 @@ case $host_os in
 		# Mach-O linker, a shared lib and a loadable
 		# object file is not the same thing.
 		DED_LDFLAGS="-bundle -flat_namespace -undefined suppress"
-		DED_CFLAGS="$DED_CFLAGS -fno-common"
+		DED_LD="$CC"
 	;;
 	*)
 		# assume GNU linker and ELF
 		DED_LDFLAGS="-shared"
 	;;
 esac
+
+AC_CHECK_PROGS(DED_LD, [$LD ld.sh])
+AC_CHECK_TOOL(DED_LD, ld, no_ld)
+if test "$DED_LD" = no_ld; then
+  AC_MSG_ERROR([ld is required to build the flex scanner!])
+fi
+
+AC_MSG_CHECKING(for linker flags for loadable drivers)
 DED_LDFLAGS="$LDFLAGS $DED_LDFLAGS"
 AC_MSG_RESULT([$DED_LDFLAGS])
-AC_SUBST(DED_LDFLAGS)
 
+fi dnl --- end no usable otp_ded.mk.in ---
+
+AC_SUBST(HAVE_USABLE_OTP_DED_MK)
+AC_SUBST(DED_CFLAGS)
+AC_SUBST(DED_INCLUDES)
+AC_SUBST(DED_THR_DEFS)
+AC_SUBST(DED_LDFLAGS)
 
 AC_CHECK_PROG(PERL, perl, perl, no_perl)
 if test "$PERL" = no_perl; then
   AC_MSG_ERROR([Perl is required to build the flex scanner!])
 fi
 
-
-dnl This is the os flavour, should be unix, vxworks or win32
-if test "X$host" = "Xwin32"; then
-	ERLANG_OSTYPE=win32
-else
-	ERLANG_OSTYPE=unix
-fi
-
-AC_SUBST(ERLANG_OSTYPE)
-
-
 AC_OUTPUT(src/flex/$host/Makefile:src/flex/Makefile.in)