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.

2 files changed, 78 insertions, 19 deletions

diff --git a/erts/aclocal.m4 b/erts/aclocal.m4
index 8002ed3d34..8052b2d67d 100644
--- a/erts/aclocal.m4
+++ b/erts/aclocal.m4
@@ -42,11 +42,16 @@ AC_ARG_VAR(CXX, [C++ compiler])
 AC_ARG_VAR(CXXFLAGS, [C++ compiler flags])
 AC_ARG_VAR(LD, [linker (is often overridden by configure)])
 AC_ARG_VAR(LDFLAGS, [linker flags (can be risky to set since LD may be overriden by configure)])
+AC_ARG_VAR(LIBS, [libraries])
 AC_ARG_VAR(DED_LD, [linker for Dynamic Erlang Drivers (set all DED_LD* variables or none)])
 AC_ARG_VAR(DED_LDFLAGS, [linker flags for Dynamic Erlang Drivers (set all DED_LD* variables or none)])
 AC_ARG_VAR(DED_LD_FLAG_RUNTIME_LIBRARY_PATH, [runtime library path linker flag for Dynamic Erlang Drivers (set all DED_LD* variables or none)])
+AC_ARG_VAR(LFS_CFLAGS, [large file support C compiler flags (set all LFS_* variables or none)])
+AC_ARG_VAR(LFS_LDFLAGS, [large file support linker flags (set all LFS_* variables or none)])
+AC_ARG_VAR(LFS_LIBS, [large file support libraries (set all LFS_* variables or none)])
 AC_ARG_VAR(RANLIB, [ranlib])
 AC_ARG_VAR(AR, [ar])
+AC_ARG_VAR(GETCONF, [getconf])
 
 dnl Cross system root
 AC_ARG_VAR(erl_xcomp_sysroot, [Absolute cross system root path (only used when cross compiling)])
@@ -82,6 +87,29 @@ else
 fi
 ])
 
+AC_DEFUN(LM_CHECK_GETCONF,
+[
+if test "$cross_compiling" != "yes"; then
+    AC_CHECK_PROG([GETCONF], [getconf], [getconf], [false])
+else
+    dnl First check if we got a `<HOST>-getconf' in $PATH
+    host_getconf="$host_alias-getconf"
+    AC_CHECK_PROG([GETCONF], [$host_getconf], [$host_getconf], [false])
+    if test "$GETCONF" = "false" && test "$erl_xcomp_sysroot" != ""; then
+	dnl We should perhaps give up if we have'nt found it by now, but at
+	dnl least in one Tilera MDE `getconf' under sysroot is a bourne
+	dnl shell script which we can use. We try to find `<HOST>-getconf'
+    	dnl or `getconf' under sysconf, but only under sysconf since
+	dnl `getconf' in $PATH is almost guaranteed to be for the build
+	dnl machine.
+	GETCONF=
+	prfx="$erl_xcomp_sysroot"
+        AC_PATH_TOOL([GETCONF], [getconf], [false],
+	             ["$prfx/usr/bin:$prfx/bin:$prfx/usr/local/bin"])
+    fi
+fi
+])
+
 dnl ----------------------------------------------------------------------
 dnl
 dnl LM_FIND_EMU_CC
@@ -533,19 +561,22 @@ dnl On ofs1 the '-pthread' switch should be used
 	    linux*)
 		THR_DEFS="$THR_DEFS -D_POSIX_THREAD_SAFE_FUNCTIONS"
 
+		LM_CHECK_GETCONF
 		AC_MSG_CHECKING(for Native POSIX Thread Library)
-		if test	X$cross_compiling = Xyes; then
-		    case X$erl_xcomp_linux_nptl in
-			X) nptl=cross;;
-			Xyes|Xno) nptl=$erl_xcomp_linux_nptl;;
+		libpthr_vsn=`$GETCONF GNU_LIBPTHREAD_VERSION 2>/dev/null`
+		if test $? -eq 0; then
+		    case "$libpthr_vsn" in
+			*nptl*|*NPTL*) nptl=yes;;
+			*) nptl=no;;
+		    esac
+		elif test "$cross_compiling" = "yes"; then
+		    case "$erl_xcomp_linux_nptl" in
+			"") nptl=cross;;
+			yes|no) nptl=$erl_xcomp_linux_nptl;;
 			*) AC_MSG_ERROR([Bad erl_xcomp_linux_nptl value: $erl_xcomp_linux_nptl]);;
 		    esac
 		else
-		    case `getconf GNU_LIBPTHREAD_VERSION 2>/dev/null` in
-			nptl*) nptl=yes;;
-			NPTL*) nptl=yes;;
-			*)  nptl=no;;
-		    esac
+		    nptl=no
 		fi
 		AC_MSG_RESULT($nptl)
 		if test $nptl = cross; then
diff --git a/erts/configure.in b/erts/configure.in
index 1892a7a1f4..3d57c2307e 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -449,16 +449,44 @@ case $host_os in
 	;;
 esac
 
+lfs_conf=ok
+lfs_source=none
+if test "${LFS_CFLAGS+set}" = "set" || \
+   test "${LFS_LDFLAGS+set}" = "set" || \
+   test "${LFS_LIBS+set}" = "set"; then
+    lfs_source=user
+else
+   LM_CHECK_GETCONF
+   test "$GETCONF" = "false" || lfs_source=getconf
+fi
 
-dnl
-dnl Use the getconf utility if it exists
-dnl to find large file support flags.
-dnl
-if type getconf >/dev/null 2>&1; then
-	CFLAGS="$CFLAGS `getconf LFS_CFLAGS 2>/dev/null`"
-	DEBUG_CFLAGS="$DEBUG_CFLAGS `getconf LFS_CFLAGS 2>/dev/null`"
-	LDFLAGS="$LDFLAGS `getconf LFS_LDFLAGS 2>/dev/null`"
-	LIBS="$LIBS `getconf LFS_LIBS 2>/dev/null`"
+if test "$lfs_source" = "none"; then
+    AC_MSG_WARN([Do not know how to check for large file support flags; no getconf is available])
+else
+    for var in CFLAGS LDFLAGS LIBS; do
+	AC_MSG_CHECKING([for large file support $var])
+	if test $lfs_source = user; then
+	    eval "lfs_val=\"\$LFS_$var\""
+	else
+	    eval "lfs_var=LFS_$var"
+	    lfs_val=`$GETCONF $lfs_var 2>/dev/null` || lfs_conf=failed
+	    if test $lfs_conf = failed; then
+		AC_MSG_RESULT([failed])
+		break
+	    fi
+	    eval "$lfs_var=\"$lfs_val\""
+	fi
+	test "$lfs_val" != "" || lfs_val=none
+	AC_MSG_RESULT([$lfs_val])
+    done
+    if test $lfs_conf = failed; then
+	AC_MSG_WARN([Check for large file support flags failed; $GETCONF failed])
+    else
+	CFLAGS="$CFLAGS $LFS_CFLAGS"
+	DEBUG_CFLAGS="$DEBUG_CFLAGS $LFS_CFLAGS"
+	LDFLAGS="$LDFLAGS $LFS_LDFLAGS"
+	LIBS="$LIBS $LFS_LIBS"
+    fi
 fi
 
 if test "x$GCC" = xyes; then
@@ -664,7 +692,7 @@ fi
 AC_PROG_LN_S
 
 
-AC_CHECK_PROG(AR, ar, ar, false)
+AC_CHECK_TOOL([AR], [ar], [false])
 if test "$ac_cv_prog_AR" = false; then
   AC_MSG_ERROR([No 'ar' command found in PATH])
 fi