Has anyone tried compiling FindLib with the visual studio 2012 or later.

 

This is ok with visual studio 2008 and an old version of ocaml 3.11.

I have also tried the most recent release tar balls of ocaml and flex without any success.

 

FindLib package has a prebuild configuration to test loading dlls as:   

 

ocaml unix.cma  - > fails with Reason: .\dllunix.dll: Invalid access to memory location.

 

(This command line routine has a dependency of ocamlrun.exe, pervasive.cma and dllunix.dll

which I have compiled all from src code using vs 2012. I have tried both static and dynamic linkage to no avail.)

 

This error originates from  flexdll.c in the FlexDLL package. It tries to call LoadLibraryEx and is returning null.

 

Further Testing

 

// A test to load dllunix dynamically ….

#include <flexdll.h>

#include <stdio.h>

#include <windows.h>

 

int main(int argc, char *argv[]) {

    void *handle;

    printf("Try open: %s\n", argv[1]);

    handle = flexdll_dlopen(argv[1], FLEXDLL_RTLD_GLOBAL);

    printf("Handle: %p\n", handle);

    if (handle == NULL) {

            printf("Error code: %d\n", GetLastError());

            printf("Error message: %s\n", flexdll_dlerror());

    }

    return 0;

}

 

cl -nologo -MD -I"D:\external\OCaml\FlexDLL_034" -c Testdll.c

flexlink -v -merge-manifest -exe -o testdll Testdll.obj

 

Direct test of dllunix.dll

 

$./testdll dllunix.dll

 

Try open:dllunix.dll

Error code: 998

Error message: Invalid access to memory location.

 

Instead of using dllunix.dll I have tried to compile a simple program for testing

 

A simplified test

 

#include <stdio.h>

int x = 10;

void dump_x(void) {

printf("myplugin finds the value : \nx=%i\n", x); fflush( stdout );

}

 

cl -nologo -MD  -I.. -c myplug.c

flexlink.exe -chain msvc -merge-manifest  -v -o myplug.dll  myplug.obj -link ws2_32.lib

 

$./testdll  myplug.dll

 

Try open: myplug.dll

Error code: 998

Error message: Invalid access to memory location.

 

Note that   the dump exe in flexdll fails in the same manner

 

In vs2008 build this is ok

 

 

$./testdll  myplug.dll

 

Try open: myplug.dll

Handle: 01F6DB78

 

Even running the test/dump.exe from flexDLL is ok

 

$ ./dump myplug.dll

 

INIT

Dynamic symbol at 00412000 (size = 12)

[0]  00402227: __iob_func

[1]  00401BA0: api

[2]  00402E7C: fflush

[3]  004017F0: flexdll_dlclose

[4]  004018B0: flexdll_dlerror

[5]  00401580: flexdll_dlopen

[6]  00401860: flexdll_dlsym

[7]  00401900: flexdll_dump_exports

[8]  00401A60: flexdll_dump_relocations

[9]  00401000: flexdll_relocate

[10]  00401BC0: main

[11]  00401D0E: printf

OK

** Loading myplug.dll

** handle = 01FEDB78

Dynamic symbol at 004C0000 (size = 4)

[0]  004B1000: FlexDLLiniter@12

[1]  004B1170: dump_x

[2]  004B11A0: torun

[3]  004BC014: x

myplugin finds the value :

x=10

 

 

 

 

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