Decide at config time if natdynlink is supported or not, but always compile/install dynlink.cmxa to simplify 3rd party packages. A runtime exception signals an unsupported natdynlink.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@10461 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

config/Makefile.mingw

@@ -70,6 +70,7 @@ DEBUGGER=ocamldebugger
 CC_PROFILE=
 SYSTHREAD_SUPPORT=true
 EXTRALIBS=
+NATDYNLINK=true
 CMXS=cmxs
 
 ########## Configuration for the bytecode compiler

config/Makefile.msvc

@@ -70,6 +70,7 @@ CC_PROFILE=
 SYSTHREAD_SUPPORT=true
 EXTRALIBS=
 CMXS=cmxs
+NATDYNLINK=true
 
 ########## Configuration for the bytecode compiler
 

config/Makefile.msvc64

@@ -70,6 +70,7 @@ DEBUGGER=ocamldebugger
 CC_PROFILE=
 SYSTHREAD_SUPPORT=true
 CMXS=cmxs
+NATDYNLINK=true
 
 ########## Configuration for the bytecode compiler
 

configure

@@ -511,17 +511,17 @@ mksharedlib=''
 byteccrpath=''
 mksharedlibrpath=''
 natdynlinkopts=""
-cmxs="cmxa"
+natdynlink=false
 
 if test $withsharedlibs = "yes"; then
   case "$host" in
     *-*-cygwin*)
-      cmxs="cmxs"
+      natdynlink=true
       mksharedlib="$flexlink"
       mkmaindll="$flexlink -maindll"
       shared_libraries_supported=true;;
     *-*-linux-gnu|*-*-linux|*-*-freebsd[3-9]*|*-*-openbsd*|*-*-netbsd*|*-*-gnu*)
-      cmxs="cmxs"
+      natdynlink=true
       sharedcccompopts="-fPIC"
       mksharedlib="$bytecc -shared"
       bytecclinkopts="$bytecclinkopts -Wl,-E"
@@ -614,6 +614,12 @@ if test -z "$mkmaindll"; then
   mkmaindll=$mksharedlib
 fi
 
+if test $natdynlink = "true"; then
+  cmxs="cmxs"
+else
+  cmxs="cmxa"
+fi
+
 # Configure the native-code compiler
 
 arch=none
@@ -1618,6 +1624,7 @@ echo "EXT_DLL=.so" >> Makefile
 echo "EXTRALIBS=" >> Makefile
 echo "CCOMPTYPE=cc" >> Makefile
 echo "TOOLCHAIN=cc" >> Makefile
+echo "NATDYNLINK=$natdynlink" >> Makefile
 echo "CMXS=$cmxs" >> Makefile
 echo "MKEXE=$mkexe" >> Makefile
 echo "MKDLL=$mksharedlib" >> Makefile
@@ -1666,6 +1673,7 @@ else
   echo "        options for linking....... $nativecclinkopts $cclibs"
   echo "        assembler ................ $as"
   echo "        preprocessed assembler ... $aspp"
+  echo "        native dynlink ........... $natdynlink"
   if test "$profiling" = "prof"; then
   echo "        profiling with gprof ..... supported"
   else

otherlibs/dynlink/Makefile

@@ -58,9 +58,9 @@ dynlinkaux.cmo: $(COMPILEROBJS)
 dynlinkaux.cmi: dynlinkaux.cmo
 
 dynlink.cmx: dynlink.cmi natdynlink.ml
-	cp natdynlink.ml dynlink.mlopt
+	sed -e 's|%%NATDYNLINK%%|$(NATDYNLINK)|' natdynlink.ml > dynlink.mlopt
 	$(CAMLOPT) -c $(COMPFLAGS) -impl dynlink.mlopt
-	rm -f dynlink.mlopt
+#	rm -f dynlink.mlopt
 
 extract_crc: dynlink.cma extract_crc.cmo
 	$(CAMLC) $(COMPFLAGS) -o extract_crc dynlink.cma extract_crc.cmo

otherlibs/dynlink/dynlink.ml

@@ -18,6 +18,8 @@
 open Dynlinkaux  (* REMOVE_ME for ../../debugger/dynlink.ml *)
 open Cmo_format
 
+let supported = true
+
 type linking_error =
     Undefined_global of string
   | Unavailable_primitive of string
@@ -33,6 +35,7 @@ type error =
   | File_not_found of string
   | Cannot_open_dll of string
   | Inconsistent_implementation of string
+  | Dynlink_not_supported
 
 exception Error of error
 
@@ -268,6 +271,8 @@ let error_message = function
       "error loading shared library: " ^ reason
   | Inconsistent_implementation name ->
       "implementation mismatch on " ^ name
+  | Dynlink_not_supported ->
+      "dynlink not supported"
 
 let is_native = false
 let adapt_filename f = f

otherlibs/dynlink/dynlink.mli

@@ -19,6 +19,10 @@ val is_native: bool
 (** [true] if the program is native,
     [false] if the program is bytecode. *)
 
+val supported: bool
+(** [true] if dynlink is supported for the current platform (always
+    [true] in bytecode, can be [false] for native code). *)
+
 (** {6 Dynamic loading of compiled files} *)
 
 val loadfile : string -> unit
@@ -127,6 +131,7 @@ type error =
   | File_not_found of string
   | Cannot_open_dll of string
   | Inconsistent_implementation of string
+  | Dynlink_not_supported
 
 exception Error of error
 (** Errors in dynamic linking are reported by raising the [Error]

otherlibs/dynlink/natdynlink.ml

@@ -15,6 +15,8 @@
 
 (* Dynamic loading of .cmx files *)
 
+let supported = %%NATDYNLINK%%
+
 type handle
 
 external ndl_open: string -> bool -> handle * string = "caml_natdynlink_open"
@@ -37,6 +39,7 @@ type error =
   | File_not_found of string
   | Cannot_open_dll of string
   | Inconsistent_implementation of string
+  | Dynlink_not_supported
 
 exception Error of error
 
@@ -93,6 +96,7 @@ let allow_extension = ref true
 let inited = ref false
 
 let default_available_units () =
+  if not supported then raise (Error Dynlink_not_supported);
   let map : (string*Digest.t*Digest.t*string list) list =
     Marshal.from_string (ndl_getmap ()) 0 in
   let exe = Sys.executable_name in
@@ -244,6 +248,8 @@ let error_message = function
       "error loading shared library: " ^ reason
   | Inconsistent_implementation name ->
       "implementation mismatch on " ^ name
+  | Dynlink_not_supported ->
+      "dynlink not supported"
 
 let is_native = true
 let adapt_filename f = Filename.chop_extension f ^ ".cmxs"