OTP-8484 Fix minor cross compilation issues

The use of mmap() was unnecessarily disabled when cross compiling.

The configure arguments --with-ssl, and --with-odbc refused to accept
libraries outside of $erl_xcomp_sysroot when cross compiling for no good
reason.

The configure argument --with-odbc didn't handle the value yes correct.

The configure arguments --with-odbc, and --without-odbc have also been
added to the configure help.

(Thanks to Steve Vinoski for reporting these issues)

erts/configure.in

@@ -1693,7 +1693,7 @@ AC_CHECK_FUNCS([getnameinfo getipnodebyname getipnodebyaddr gethostbyname2])
 
 AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlopen \
 		pread pwrite writev memmove strerror strerror_r strncasecmp \
-		gethrtime localtime_r gmtime_r mremap memcpy mallopt \
+		gethrtime localtime_r gmtime_r mmap mremap memcpy mallopt \
 		sbrk _sbrk __sbrk brk _brk __brk \
 		flockfile fstat strlcpy strlcat setsid posix2time setlocale nl_langinfo poll])
 if test "X$host" = "Xwin32"; then
@@ -1725,7 +1725,6 @@ if test $disable_vfork = true; then
 fi
 
 AC_FUNC_VPRINTF
-AC_FUNC_MMAP
 
 dnl The AC_DEFINEs are necessary for autoheader to work. :-(
 dnl for gzio
@@ -3729,13 +3728,6 @@ dnl		so it is - be adoptable
     fi
     ;;
   *)
-    if test "$cross_compiling" = "yes"; then
-	case "$with_ssl" in
-	    "$erl_xcomp_sysroot"*) ;;
-	    *) AC_MSG_ERROR([Invalid path to option --with-ssl=PATH (not a subdirectory to cross system root)]);;
-	esac
-    fi
-
     # Option given with PATH to package
     if test ! -d "$with_ssl" ; then
        AC_MSG_ERROR(Invalid path to option --with-ssl=PATH)

lib/odbc/configure.in

@@ -1,3 +1,21 @@
+dnl
+dnl %CopyrightBegin%
+dnl
+dnl Copyright Ericsson AB 2005-2010. 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 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 %CopyrightEnd%
+dnl
 
 dnl define([AC_CACHE_LOAD], )dnl
 dnl define([AC_CACHE_SAVE], )dnl
@@ -25,6 +43,11 @@ else
     host_os=win32
 fi
 
+AC_ARG_WITH(odbc,
+[  --with-odbc=PATH        specify location of ODBC include and lib
+  --with-odbc             use ODBC (default)
+  --without-odbc          don't use ODBC])
+
 if test "$with_odbc" = "no"; then
 
    rm -f "$ERL_TOP/lib/odbc/SKIP"
@@ -116,7 +139,7 @@ AC_SUBST(TARGET_FLAGS)
     case $host_os in
         darwin*)
                 TARGET_FLAGS="-DUNIX"
-	        if test ! -d "$with_odbc" || test "$with_odbc" = "yes" ; then				
+	        if test ! -d "$with_odbc" || test "$with_odbc" = "yes"; then
 		    ODBC_LIB= -L"/usr/lib"
 		    ODBC_INCLUDE="-I/usr/lib/include"
 		else
@@ -129,7 +152,7 @@ AC_SUBST(TARGET_FLAGS)
         win32|cygwin)
 		TARGET_FLAGS="-DWIN32"
 		AC_CHECK_LIB(ws2_32, main)
-		if test ! -d "$with_odbc"; then				
+		if test ! -d "$with_odbc" || test "$with_odbc" = "yes"; then
 		    ODBC_LIB=""   
 		    ODBC_INCLUDE=""
 		else
@@ -147,7 +170,7 @@ AC_SUBST(TARGET_FLAGS)
 			echo "$msg" > "$ERL_TOP/lib/odbc/SKIP"
 			odbc_lib_link_success=wont_try
 			;;
-		    no- )
+		    no-yes | no- )
 			AC_CHECK_SIZEOF(void *)
 			AC_MSG_CHECKING([for odbc in standard locations])
 			for rdir in /usr/local/odbc /usr/local /usr/odbc \
@@ -177,7 +200,7 @@ AC_SUBST(TARGET_FLAGS)
 			fi
 			;;
 
-		    no-*)
+		    *)
 			ODBC_LIB=-L"$with_odbc/lib"
 			ODBC_INCLUDE="-I$with_odbc/include"
 			AC_CHECK_LIB(odbc, SQLAllocHandle,[ODBC_LIB="$ODBC_LIB -lodbc"; odbc_lib_link_success=yes])