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, 235 insertions, 197 deletions

diff --git a/xcomp/erl-xcomp.conf.template b/xcomp/erl-xcomp.conf.template
index bed365e754..9242318577 100644
--- a/xcomp/erl-xcomp.conf.template
+++ b/xcomp/erl-xcomp.conf.template
@@ -1,198 +1,236 @@
-###
-### %CopyrightBegin%
-### 
-### Copyright Ericsson AB 2009. All Rights Reserved.
-### 
-### The contents of this file are subject to the Erlang Public License,
-### Version 1.1, (the "License"); you may not use this file except in
-### compliance with the License. You should have received a copy of the
-### Erlang Public License along with this software. If not, it can be
-### retrieved online at http://www.erlang.org/.
-### 
-### Software distributed under the License is distributed on an "AS IS"
-### basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
-### the License for the specific language governing rights and limitations
-### under the License.
-### 
-### %CopyrightEnd%
-###
-### File: erl-xcomp.conf
-### Author: Rickard Green
-###
-
-### ----------------------------------------------------------------------------
-### When cross compiling Erlang/OTP, copy this file and set the variables
-### needed below. Then pass the path to the copy of this file as an argument
-### to "eval `otp_build env_cross <absolute path to erl-xcomp.conf file>`".
-### ----------------------------------------------------------------------------
-
-### ----------------------------------------------------------------------------
-### Variables in the following section *have* to be set.
-###
-
-##
-## Target system. The value will be passed as '--host' argument to the configure
-## script. It does not have to be a full CPU-VENDOR-OS tripplet, but can be. The
-## full CPU-VENDOR-OS tripplet will be created by:
-##  $ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host
-##
-erl_xcomp_host=
-
-### ----------------------------------------------------------------------------
-### To override the configure flags for a special target system, You
-### can set this variable which overrides configure parameters on the 
-### command line and instead uses the specified options. The variable
-### leaves the build-host system untouched.
-### ----------------------------------------------------------------------------
-erl_xcomp_configure_flags=
-
-###-----------------------------------------------------------------------------
-### You can specify a specific CC or LD for the build target (the cross 
-### compiler) here along with magic CFLAGS and/or LDFLAGS if needed
-### ar and ranlib might also be specified if needed.
-###-----------------------------------------------------------------------------
-
-erl_xcomp_cc=
-
-erl_xcomp_ld=
-
-erl_xcomp_cflags=
-
-erl_xcomp_cpp=
-
-erl_xcomp_ldflags=
-
-erl_xcomp_ranlib=
-
-erl_xcomp_ar=
-
-###-----------------------------------------------------------------------------
-### The ded_ls and ded_ldflags variables control linking of dynamically loaded
-### erlang drivers. On i.e. Linux these are set to
-### $(CC) and "-shared" respectively, but other OS'es might need other
-### programs and flags to build a dynamic library. 
-### erl_xcomp_ded_ld_runtime_library_path is the flag to set a
-### specific runtime library path for the shared library at link time, 
-### usually this should be left empty.
-###-----------------------------------------------------------------------------
-
-erl_xcomp_ded_ld=
-
-erl_xcomp_ded_ldflags=
-
-erl_xcomp_ded_ld_runtime_library_path=
-
-###
-### Optional feature, or bug tests
-###
-### These tests cannot (always) be done automatically when cross compiling.
-### You usually does not need to set these variables. Only set these if you
-### really know what you are doing.
-###
-
-##
+#### -*-shell-script-*-
+####
+#### %CopyrightBegin%
+####
+#### Copyright Ericsson AB 2009-2010. All Rights Reserved.
+####
+#### The contents of this file are subject to the Erlang Public License,
+#### Version 1.1, (the "License"); you may not use this file except in
+#### compliance with the License. You should have received a copy of the
+#### Erlang Public License along with this software. If not, it can be
+#### retrieved online at http://www.erlang.org/.
+####
+#### Software distributed under the License is distributed on an "AS IS"
+#### basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+#### the License for the specific language governing rights and limitations
+#### under the License.
+####
+#### %CopyrightEnd%
+####
+#### File: erl-xcomp.conf.template
+#### Author: Rickard Green
+####
+#### --------------------------------------------------------------------------
+#### When cross compiling Erlang/OTP using `otp_build', copy this file and set
+#### the variables needed below. Then pass the path to the copy of this file as
+#### an argument to `otp_build' in the configure stage:
+####   `otp_build configure --xcomp-conf=<FILE>'
+#### --------------------------------------------------------------------------
+
+### Note that you cannot define arbitrary variables in a cross compilation
+### configuration file. Only the ones listed below will be guaranteed to be
+### visible throughout the whole execution of all `configure' scripts. Other
+### variables needs to be defined as arguments to `configure' or exported in
+### the environment.
+
+### ---- `otp_build' only variables -------------------------------------------
+
+### Variables in this section are only used, when configuring Erlang/OTP for
+### cross compilation using `$ERL_TOP/otp_build configure'.
+
+### NOTE! These variables currently have *no* effect if you configure using the
+### `configure' script directly.
+
+## erl_xcomp_build - Build system.
+##    This value will be passed as `--build=$erl_xcomp_build' argument to the
+##    `configure' script. It does not have to be a full CPU-VENDOR-OS triplet,
+##    but can be. The full CPU-VENDOR-OS triplet will be created by:
+##      `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'
+##    If `erl_xcomp_build=guess', the build system will be guessed using:
+##      `$ERL_TOP/erts/autoconf/config.guess'. 
+#erl_xcomp_build=
+
+## erl_xcomp_host - Cross host system.
+##    This value will be passed as `--host=$erl_xcomp_host' argument to the
+##    `configure' script. It does not have to be a full CPU-VENDOR-OS triplet,
+##    but can be. The full CPU-VENDOR-OS triplet will be created by:
+##      `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'
+#erl_xcomp_host=
+
+## erl_xcomp_configure_flags - Extra configure flags.
+##    Extra flags to pass to the `configure' script.
+#erl_xcomp_configure_flags=
+
+### ---- Cross compiler and other tools to use --------------------------------
+
+### If the cross compilation tools are prefixed by `<HOST>-' you probably do
+### not need to set these variables (where `<HOST>' is what has been passed as
+### `--host=<HOST>' argument to `configure').
+
+## CC - C compiler.
+#CC=
+
+## CFLAGS - C compiler flags.
+#CFLAGS=
+
+## STATIC_CFLAGS - Static C compiler flags.
+#STATIC_CFLAGS=
+
+## CFLAG_RUNTIME_LIBRARY_PATH - C compiler runtime library path flag.
+##    This flag should set a specific runtime library path for the shared
+##    library at link time. Note that this is actually a linker flag, but it
+##    needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+## CPP - C pre-processor.
+#CPP=
+
+## CPPFLAGS - C pre-processor flags.
+#CPPFLAGS=
+
+## CXX - C++ compiler.
+#CXX=
+
+## CXXFLAGS - C++ compiler flags.
+#CXXFLAGS=
+
+## LD - Linker
+#LD=
+
+## LDFLAGS - Linker flags.
+#LDFLAGS=
+
+### -- Dynamic Erlang Driver linker flags. --
+
+### NOTE! Either define all or non of the DED_LD* variables.
+
+## DED_LD - Linker.
+#DED_LD=
+
+## DED_LDFLAGS - Linker flags.
+#DED_LDFLAGS=
+
+## DED_LD_FLAG_RUNTIME_LIBRARY_PATH - Linker runtime library path flag.
+##    This flag should set a specific runtime library path for the shared
+##    library at link time.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+### -- Other tools --
+
+## RANLIB - ranlib
+#RANLIB=
+
+## AR - ar
+#AR=
+
+### ---- Cross System Root Locations ------------------------------------------
+
+## erl_xcomp_sysroot - Absolute cross system root path.
+##    The absolute path to the system root of the cross compilation
+##    environment. Currently, the `crypto', `odbc', `ssh' and `ssl'
+##    applications need the system root. These applications will be skipped
+##    if the system root has not been set. The system root might be needed
+##    for other things too. If this is the case and the system root has not
+##    been set, `configure' will fail and request you to set it.
+#erl_xcomp_sysroot=
+
+## erl_xcomp_isysroot - Absolute cross include system root path.
+##    The absolute path to the system root for includes of the cross
+##    compilation environment. If not set, this value defaults to
+##    `$erl_xcomp_sysroot', i.e., only set this value if the include system
+##    root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+### ---- Optional feature, or bug tests ---------------------------------------
+
+### These tests cannot (always) be done automatically when cross compiling. You
+### usually does not need to set these variables. Only set these if you really
+### know what you are doing.
+
+### The `configure' script will issue a warning when a default value is used.
+### When a variable has been set, no warning will be issued.
+
 ## erl_xcomp_bigendian - yes|no
-##  If yes, the target system must be big endian. If no, little endian. This
-##  can often be automatically detected, but not always. If not automatically
-##  detected, configure will fail unless this variable is set. No default value
-##  is used, i.e., configure will try to figure this out automatically.
-erl_xcomp_bigendian=
-
-##
-## erl_xcomp_linux_clock_gettime_correction - yes|no (defaults to yes)
-##  If yes, clock_gettime(CLOCK_MONOTONIC, _) on the target system must work.
-##  This variable is recommended to be set to no on Linux systems with kernel
-##  versions less than 2.6.
-##
-erl_xcomp_linux_clock_gettime_correction=
-
-##
-## erl_xcomp_linux_nptl - yes|no (defaults to yes on Linux; otherwise, no)
-##  If yes, the target system must have NPTL (Native POSIX Thread Library).
-##  Older Linux systems have LinuxThreads instead of NPTL (Linux kernel
-##  versions typically less than 2.6).
-##
-erl_xcomp_linux_nptl=
-
-##
-## erl_xcomp_linux_usable_sigusrx - yes|no (defaults to yes)
-##  If yes, the SIGUSR1 and SIGUSR2 must be usable by the ERTS. Old
-##  LinuxThreads thread libraries (Linux kernel versions less than 2.2) used
-##  these signals and made them unusable by the ERTS.
-##
-erl_xcomp_linux_usable_sigusrx=
-
-##
-## erl_xcomp_linux_usable_sigaltstack - yes|no (defaults to yes)
-##  If yes, sigaltstack() must be usable on the target system. sigaltstack()
-##  on Linux kernel versions less than 2.4 are broken.
-##
-erl_xcomp_linux_usable_sigaltstack=
-
-##
-## erl_xcomp_poll - yes|no (defaults to no on Darwin/MacOSX; otherwise, yes)
-##  If yes, the target system must have a working poll() implementation that
-##  also can handle devices. If no, select() will be used instead of poll().
-##
-erl_xcomp_poll=
-
-##
-## erl_xcomp_kqueue - yes|no (defaults to no)
-##  If yes, the target system must have a working kqueue() implementation that
-##  returns a file descriptor which can be used by poll() and/or select().
-##  If no and the target system has not got epoll() or /dev/poll, the
-##  kernel-poll feature will be disabled.
-##
-erl_xcomp_kqueue=
-
-##
-## erl_xcomp_putenv_copy - yes|no (defaults to no)
-##  If yes, the target system must have a putenv() implementation that stores a
-##  copy of the key/value pair.
-##
-erl_xcomp_putenv_copy=
-
-##
-## erl_xcomp_reliable_fpe - yes|no (defaults to no)
-##  If yes, the target system must have reliable floating point exceptions.
-##
-erl_xcomp_reliable_fpe=
-
-##
-## erl_xcomp_getaddrinfo - yes|no (defaults to no)
-##  If yes, the target system must have a working getaddrinfo() implementation
-##  that can handle both IPv4 and IPv6.
-##
-erl_xcomp_getaddrinfo=
-
-##
-## erl_xcomp_gethrvtime_procfs_ioctl - yes|no (defaults to no)
-##  If yes, the target system must have a working gethrvtime() implementation
-##  and is used with procfs ioctl().
-##
-erl_xcomp_gethrvtime_procfs_ioctl=
-
-##
-## erl_xcomp_clock_gettime - yes|no (defaults to no)
-##  If yes, the target system must have a working clock_gettime()
-##  implementation that can be used for retrieving process CPU time.
-##
-erl_xcomp_clock_gettime=
-
-##
-## erl_xcomp_after_morecore_hook - yes|no (defaults to no)
-##  If yes, the target system must have a working __after_morecore_hook that
-##  can be used for tracking used malloc() implementations core memory usage.
-##
-erl_xcomp_after_morecore_hook=
-
-##
-## erl_xcomp_dlsym_brk_wrappers - yes|no (defaults to no)
-##  If yes, the target system must have a working dlsym(RTLD_NEXT, <S>)
-##  implementation that can be used on 'brk' and 'sbrk' symbols used by the
-##  malloc() implementation in use, and by this track the malloc()
-##  implementations core memory usage.
-##
-erl_xcomp_dlsym_brk_wrappers=
-
-### ----------------------------------------------------------------------------
+##    If `yes', the target system must be big endian. If `no', little endian.
+##    This can often be automatically detected, but not always. If not
+##    automatically detected, `configure' will fail unless this variable is
+##    set. No default value is used, i.e., `configure' will try to figure
+##    this out automatically.
+#erl_xcomp_bigendian=
+
+## erl_xcomp_linux_clock_gettime_correction - yes|no (defaults to `yes' on
+##                                                    Linux; otherwise, `no')
+##    If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on the target system must
+##    work. This variable is recommended to be set to `no' on Linux systems
+##    with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+## erl_xcomp_linux_nptl - yes|no (defaults to `yes' on Linux; otherwise, `no')
+##    If `yes', the target system must have NPTL (Native POSIX Thread Library).
+##    Older Linux systems have LinuxThreads instead of NPTL (Linux kernel
+##    versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+## erl_xcomp_linux_usable_sigusrx - yes|no (defaults to `yes')
+##    If `yes', the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS.
+##    Old LinuxThreads thread libraries (Linux kernel versions less than 2.2)
+##    used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+## erl_xcomp_linux_usable_sigaltstack - yes|no (defaults to `yes' on Linux;
+##                                              otherwise, `no')
+##    If `yes', `sigaltstack()' must be usable on the target system.
+##    `sigaltstack()' on Linux kernel versions less than 2.4 are broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+## erl_xcomp_poll - yes|no (defaults to `no' on Darwin/MacOSX; otherwise, `yes')
+##    If `yes', the target system must have a working `poll()' implementation
+##    that also can handle devices. If `no', `select()' will be used instead of
+##    `poll()'.
+#erl_xcomp_poll=
+
+## erl_xcomp_kqueue - yes|no (defaults to `no')
+##    If `yes', the target system must have a working `kqueue()' implementation
+##    that returns a file descriptor which can be used by `poll()' and/or
+##    `select()'. If `no' and the target system has not got `epoll()' or
+##    `/dev/poll', the kernel-poll feature will be disabled.
+#erl_xcomp_kqueue=
+
+## erl_xcomp_putenv_copy - yes|no (defaults to `no')
+##    If `yes', the target system must have a `putenv()' implementation that
+##    stores a copy of the key/value pair.
+#erl_xcomp_putenv_copy=
+
+## erl_xcomp_reliable_fpe - yes|no (defaults to `no')
+##    If `yes', the target system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## erl_xcomp_getaddrinfo - yes|no (defaults to `no')
+##    If `yes', the target system must have a working `getaddrinfo()'
+##    implementation that can handle both IPv4 and IPv6.
+#erl_xcomp_getaddrinfo=
+
+## erl_xcomp_gethrvtime_procfs_ioctl - yes|no (defaults to `no')
+##    If `yes', the target system must have a working `gethrvtime()'
+##    implementation and is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+## erl_xcomp_clock_gettime_cpu_time - yes|no (defaults to `no')
+##    If `yes', the target system must have a working `clock_gettime()'
+##    implementation that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+## erl_xcomp_after_morecore_hook - yes|no (defaults to `no')
+##    If `yes', the target system must have a working `__after_morecore_hook'
+##    that can be used for tracking used `malloc()' implementations core memory
+##    usage.
+#erl_xcomp_after_morecore_hook=
+
+## erl_xcomp_dlsym_brk_wrappers - yes|no (defaults to `no')
+##    If `yes', the target system must have a working `dlsym(RTLD_NEXT, <S>)'
+##    implementation that can be used on `brk' and `sbrk' symbols used by the
+##    `malloc()' implementation in use, and by this track the `malloc()'
+##    implementations core memory usage.
+#erl_xcomp_dlsym_brk_wrappers=
+
+#### --------------------------------------------------------------------------