[Bug java/12987] New: Problems with linking application that calls JVM

[Bug java/12987] New: Problems with linking application that calls JVM

[oyvind dot harboe at zylin dot com]

This problem is described in:

http://gcc.gnu.org/ml/java/2003-11/msg00055.html

I tried the patch referred to in this thread, and my application links, but it 
crashes when I try to call one of the functions in the DLL.

-- 
           Summary: Problems with linking application that calls JVM
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: oyvind dot harboe at zylin dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] Problems with linking application that calls JVM

[oyvind dot harboe at zylin dot com]

------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 08:06 -------
More info:

http://gcc.gnu.org/ml/java/2003-11/msg00112.html

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] [Mingw] Problems with linking application that calls JVM

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Problems with linking       |[Mingw] Problems with
                   |application that calls JVM  |linking application that
                   |                            |calls JVM


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] Incompatibility with VC++

[oyvind dot harboe at zylin dot com]

------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 14:08 -------
This appears to be a more general(not Java specific) compatibility problem 
between Visual C++ 6.0 and GCC. 

I'll attach foo.c and bar.c

1. gcc -shared -o bar.dll -Wl,--out-implib,foo.lib bar.c
2. gcc -o foo foo.c bar.lib

When I compile 2. from VC++, I get an error message and the application crashes 
when it tries to invoke bar():

--------------------Configuration: test2 - Win32 Debug--------------------
Compiling...
foo.c
Linking...
bar.lib(d000001.o) : warning LNK4078: multiple ".text" sections found with 
different attributes (E0000020)

test2.exe - 0 error(s), 1 warning(s)

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[Mingw] Problems with       |Incompatibility with VC++
                   |linking application that    |
                   |calls JVM                   |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] Incompatibility with VC++

[oyvind dot harboe at zylin dot com]

------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 14:09 -------
Created an attachment (id=5106)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5106&action=view)
First example file


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] Incompatibility with VC++

[oyvind dot harboe at zylin dot com]

------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 14:09 -------
Created an attachment (id=5107)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5107&action=view)
Second example file


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] Incompatibility with VC++ in -Wl,--out-implib code

[oyvind dot harboe at zylin dot com]

------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 14:12 -------
I tested with GCC 3.3 and the VC++ application still crashes when it tries to 
invoke bar().

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Incompatibility with VC++   |Incompatibility with VC++ in
                   |                            |-Wl,--out-implib code


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug java/12987] Incompatibility with VC++ in -Wl,--out-implib code

[oyvind dot harboe at zylin dot com]

------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 14:48 -------
Created an attachment (id=5108)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5108&action=view)
If I generate bar.lib from VC++, everything works


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug target/12987] Incompatibility with VC++ in -Wl,--out-implib code

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-11-10 18:44 -------
The --out-implib part is not a gcc bug but rather a binutils bug, report it to them also.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|java                        |target
     Ever Confirmed|                            |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2003-11-10 18:44:19
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug target/12987] Incompatibility with VC++ in -Wl,--out-implib code

[dannysmith at gcc dot gnu dot org]

------- Additional Comments From dannysmith at gcc dot gnu dot org  2003-11-10 19:42 -------
This is a known bug in the MS linker: it does not understand  GNU ld import 
libs.

To workaround, build an import lib for MS using a .def file containing the 
exports and the MS programme (I think it is called lib.exe) that does what
GNU dlltool does.

I think that this also applies in general to any other windows linker 
programme. 

Danny

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug target/12987] Incompatibility with VC++ in -Wl,--out-implib code

[oyvind dot harboe at zylin dot com]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 577 bytes --]


------- Additional Comments From oyvind dot harboe at zylin dot com  2003-11-10 19:48 -------
>This is a known bug in the MS linker: it does not understand  GNU ld import 
>libs.

Will this be fixed at some point? 

(If not, shouldn't this option be removed from GCC?)

>To workaround, build an import lib for MS using a .def file containing the 
>exports and the MS programme (I think it is called lib.exe) that does what
>GNU dlltool does.

For now I just used GetProcAddress() explicitly, moving on. :-)

Øyvind



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987

[Bug target/12987] Incompatibility with VC++ in -Wl,--out-implib code

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-11-15 09:02 -------
Not a GCC bug but rather a binutils bug, report it to them.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12987