Clarified configuration and license aspects of libreadline and libedit

README

@@ -98,11 +98,18 @@ Several alias links point to the xorriso binary:
     xorrecord  starts xorriso with -as cdrecord emulation already enabled
     osirrox    starts with -osirrox image-to-disk copying already enabled
 
-By default xorriso will depend on libreadline if the readline-dev headers
-are present. This dependcy can be avoided by running
+By default libisoburn will depend on libreadline if the library and its
+development header files are present at compile time. If not, then it will
+try to depend on libedit and its header file.
+Both conditional dependencies can be avoided by running
     ./configure --prefix=/usr --disable-libreadline
     make clean ; make
-Never omit the "make clean" command after switching libreadline enabling.
+Never omit the "make clean" command after switching enabling of libreadline.
+Note that depending on libreadline-6 will cause libisoburn's license to
+become "GPL version 3 or later".
+If you want to explictely allow only the use of libedit, then do
+    ./configure --prefix=/usr --disable-libreadline --enable-libedit
+
 Other deliberate dependency reduction options of ./configure are:
     --disable-libacl   avoid use of ACL functions like acl_to_text()
     --disable-xattr    avoid use of xattr functions like listxattr() on Linux

configure.ac

@@ -143,20 +143,26 @@ dnl The X= in the yes case prevents that -lreadline gets linked twice
     fi
 else
     READLINE_DEF=
+    echo "disabled libreadline"
 fi
 if test x$READLINE_DEF = x; then
+    if test x$enable_libreadline = xyes; then
+        libedit_deflt=yes
+    else
+        libedit_deflt=no
+    fi
     AC_ARG_ENABLE(libedit,
-    [  --enable-libedit    Enable use of libedit by xorriso if not libreadline, default=yes],
-                   , enable_libedit=yes)
+[  --enable-libedit        Enable use of libedit by xorriso if not libreadline,
+                          default= setting of --enable-libreadline],
+                   , enable_libedit=$libedit_deflt)
     if test x$enable_libedit = xyes; then
-dnl Check whether there is development and runtime support.
-dnl If not, erase this macro which would enable use of el_*(), history*()
         READLINE_DEF="-DXorriso_with_editlinE"
 
         LIBBURNIA_ASSERT_EDITLINE
 
     else
         READLINE_DEF=
+        echo "disabled libedit"
     fi
 fi
 AC_SUBST(READLINE_DEF)

xorriso/README_gnu_xorriso

@@ -41,7 +41,8 @@ components:
    libc, libpthread
    plus on FreeBSD: libiconv, libcam, IDE and SATA drives need atapicam
 Optional at compile time are:
-   libreadline and the readline-dev headers make dialog mode more convenient.
+   libreadline and the readline-dev headers, or libedit and its header,
+   make dialog mode more convenient.
    zlib and zlib-devel allow zisofs compression.
    on GNU/Linux: libacl and libacl-devel allow getting and setting ACLs.
 If they were present at compile time, then the optional libraries have to
@@ -90,11 +91,16 @@ The installation creates several alias links pointing to the xorriso binary:
     osirrox    starts with -osirrox image-to-disk copying already enabled
 
 
-If you want to avoid dependecy on libreadline although the libreadline
-development package is installed, then rather build xorriso by:
-    ./configure --prefix=/usr --disable-libreadline 
+By default xorriso will depend on libreadline if the library and its
+development header files are present at compile time. If not, then it will
+try to depend on libedit and its header file.
+Both conditional dependencies can be avoided by running
+    ./configure --prefix=/usr --disable-libreadline
     make clean ; make
-Never omit the "make clean" command after switching libreadline enabling.
+Never omit the "make clean" command after switching enabling of libreadline.
+If you want to explictely allow only the use of libedit, then do
+    ./configure --prefix=/usr --disable-libreadline --enable-libedit
+
 Other deliberate dependency reduction options of ./configure are:
     --disable-libacl   avoid use of ACL functions like acl_to_text()
     --disable-xattr    avoid use of xattr functions like listxattr() on Linux

xorriso/configure_ac.txt

@@ -173,22 +173,27 @@ dnl The X= in the yes case prevents that -lreadline gets linked twice
     fi
 else
     READLINE_DEF=
+    echo "disabled libreadline"
 fi
 if test x$READLINE_DEF = x; then
     AH_TEMPLATE([Xorriso_with_editlinE],
                 [Define to use libedit if not libreadline])
+    if test x$enable_libreadline = xyes; then
+        libedit_deflt=yes
+    else
+        libedit_deflt=no
+    fi
     AC_ARG_ENABLE(libedit,
-    [  --enable-libedit    Enable use of libedit by xorriso if not libreadline, default=yes],
-                   , enable_libedit=yes)
+[  --enable-libedit        Enable use of libedit by xorriso if not libreadline,                           default= setting of --enable-libreadline],
+                   , enable_libedit=$libedit_deflt)
     if test x$enable_libedit = xyes; then
-dnl Check whether there is development and runtime support.
-dnl If not, erase this macro which would enable use of el_*(), history*()
         READLINE_DEF="-DXorriso_with_editlinE"
 
         LIBBURNIA_ASSERT_EDITLINE
 
     else
         READLINE_DEF=
+        echo "disabled libedit"
     fi
 fi
 if test x$READLINE_DEF = x-DXorriso_with_readlinE

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2014.06.15.094311"
+#define Xorriso_timestamP "2014.06.15.125555"