[Nant-users] problem with script task

[Helmut Dipper]

Hello,

I use nant rc1 on Windows XP.

I want to use wrapped functions out of a gcc-generated dll,
but detected following problem:
A function defined via task script doesn't return
when calling a function from a dll created by gcc.

Remarks:
- I attached all test files (zip-file was not possible).
- the build-script finishes when the inner function finishes
  without any error message.
- if the dll is used in a main program, no problem occurs.
- if the test-dll is created by MS Visual C, no problem occurs,
  but due to other reasons I cannot switch to MS VC.
- gcc -v delivers: gcc version 3.3.3 (cygwin special).

Best regards
Helmut Dipper
#if defined(WIN32) 
#   define DLL_EXPORT __declspec(dllexport)
#else
#   define DLL_EXPORT /**/
#endif

#include <stdio.h>
#include <string.h>

DLL_EXPORT char *dll_fct (char *par)
{
   static char buf[1024 + 1];

   printf("executing dll_fct\n");

   buf[0] = 0;
   strcat(buf, "input: ");
   strcat(buf, par);

   return buf;
}


#include <stdio.h>
#include <string.h>

extern char *dll_fct (char *);

main ()
{
   printf("before\n");

   printf("%s\n", dll_fct("hello"));

   printf("after\n");
}


<?xml version="1.0"?>
<project name="test" default="test">

   <script language="C#" prefix="test">
      <imports>
         <import name="System.Runtime.InteropServices"/>
      </imports>
      <code>
         <![CDATA[
         [DllImport("test.dll",
            EntryPoint="dll_fct",ExactSpelling=true,
            CharSet=CharSet.Ansi,
            CallingConvention=CallingConvention.StdCall
         )]
         private static extern string dll_fct(string par);

         [Function("call")]
         public static string call(string par)
         {
            string res;

            res = dll_fct(par);

            return res;
         }
         ]]>
      </code>
   </script>

   <target name="test">
      <echo message="begin"/>
      <echo message="${test::call('test')}"/>
      <echo message="end"/>
   </target>
</project>


cl -IE:/progra~1/visual~1/VC98/include -DDEBUG /Z7 -DWIN32 /nologo /W2 -c fct.c
/e/progra~1/visual~1/VC98/bin/link.exe /DLL /OUT:test.dll 
/LIBPATH:E:/progra~1/visual~1/VC98/lib /pdb:none /machine:I386 /nologo 
/incremental:no /subsystem:console fct.obj kernel32.lib

cl -IE:/progra~1/visual~1/VC98/include -DDEBUG /Z7 -DWIN32 /nologo /W2 -c main.c
/e/progra~1/visual~1/VC98/bin/link.exe /pdb:none /machine:I386 /nologo 
/incremental:no /subsystem:console /OUT:main.exe 
/LIBPATH:E:/progra~1/visual~1/VC98/lib main.obj fct.obj kernel32.lib
/e/progra~1/visual~1/VC98/bin/link.exe /pdb:none /machine:I386 /nologo 
/incremental:no /subsystem:console /OUT:main.exe 
/LIBPATH:E:/progra~1/visual~1/VC98/lib main.obj test.lib kernel32.lib

gcc -O2 -c fct.c
gcc -v -o test.dll -shared fct.o

gcc -O2 -c main.c
gcc -v -o main.exe main.o test.dll