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[bug #23709] NSProxy test fails on Ubuntu with ffcall

From: Fred Kiefer
Subject: [bug #23709] NSProxy test fails on Ubuntu with ffcall
Date: Wed, 25 Jun 2008 23:20:31 +0000
User-agent: Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.7 (like Gecko) SUSE


                 Summary: NSProxy test fails on Ubuntu with ffcall
                 Project: GNUstep
            Submitted by: FredKiefer
            Submitted on: Mittwoch 25.06.2008 um 23:20
                Category: Base/Foundation
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any



I am using Ubuntu 8.04 (32-bit) in a VMWareFusion environment. I jsut update
to this release and also updated GNUstep to latest SVN. Now an application
that use to work give segmentation faults for both ffi and ffcall.

When trying to trac down the problem for ffcall further I ran the testsuite
for base and got the following problem there (This works fine on my desktop

address@hidden:/usr/src/gnustep/modules/tests/testsuite/base/NSProxy$ gdb
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...
(gdb) r
Starting program:
[Thread debugging using libthread_db enabled]
[New Thread 0xb77bb6b0 (LWP 895)]
PASS: Proxy signed char
PASS: Proxy unsigned char
PASS: Proxy signed short
PASS: Proxy unsigned short
PASS: Proxy singed int
PASS: Proxy unsigned int
PASS: Proxy signed long
PASS: Proxy unsigned long
PASS: Proxy signed long long
PASS: Proxy unsigned long long
PASS: Proxy float
PASS: Proxy float
PASS: Proxy id
PASS: Proxy enum
PASS: Proxy NSRange
PASS: Proxy NSPoint
PASS: Proxy NSDecimal
FAIL: Proxy GSFinePoint

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb77bb6b0 (LWP 895)]
0xb7c4c0f8 in mframe_next_arg (typePtr=0x0, info=0x809f1b0, 
    outTypes=0x809f1f9 "") at mframe.m:229
229           switch (*typePtr)
(gdb) bt
#0  0xb7c4c0f8 in mframe_next_arg (typePtr=0x0, info=0x809f1b0, 
    outTypes=0x809f1f9 "") at mframe.m:229
#1  0xb7d3e06e in -[NSMethodSignature(GNUstep) methodInfo] (self=0x809f108, 
    _cmd=0xb7f86658) at NSMethodSignature.m:189
#2  0xb7e00b08 in -[GSFFCallInvocation initWithMethodSignature:] (
    self=0x809f170, _cmd=0xb7f866a8, aSignature=0x809f108)
    at GSFFCallInvocation.m:547
#3  0xb7e0270a in GSInvocationCallback (callback_data=0x80710b8, 
    args=0xbfe52c94) at GSFFCallInvocation.m:957
#4  0xb785d6d5 in __vacall_r () from /usr/lib/libcallback.so.0
#5  0x080710b8 in ?? ()
#6  0xb7a3f450 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#7  0x08048ba1 in _start ()

The config.log for ffi and ffcall reads like this:
configure:16312: checking ffi.h presence
configure:16327: gcc -E  -I/usr/GNUstep/System/Library/Headers conftest.c
configure:16333: $? = 0
configure:16347: result: yes
configure:16375: checking for ffi.h
configure:16382: result: yes
configure:16408: checking callback.h usability
configure:16425: gcc -c -g -O2  -I/usr/GNUstep/System/Library/Headers
conftest.c >&5
configure:16431: $? = 0
configure:16445: result: yes
configure:16449: checking callback.h presence
configure:16464: gcc -E  -I/usr/GNUstep/System/Library/Headers conftest.c
configure:16470: $? = 0
configure:16484: result: yes
configure:16512: checking for callback.h
configure:16520: result: yes
configure:16549: checking for forwarding callback in runtime
configure:16560: gcc -c -g -O2  -I/usr/GNUstep/System/Library/Headers
-fgnu-runtime -x objective-c conftest.c >&5
In file included from conftest.c:1:
./config/config.forward2.m: In function 'main':
./config/config.forward2.m:5: error: '__objc_msg_forward2' undeclared (first
use in this function)
./config/config.forward2.m:5: error: (Each undeclared identifier is reported
only once
./config/config.forward2.m:5: error: for each function it appears in.)
configure:16566: $? = 1
configure: failed program was:
| #include "./config/config.forward2.m"
configure:16596: gcc -c -g -O2  -I/usr/GNUstep/System/Library/Headers
-fgnu-runtime -x objective-c conftest.c >&5
configure:16602: $? = 0
configure:16617: result: yes
configure:16625: checking FFI library usage
configure:16716: gcc -o conftest -g -O2 
-I/usr/GNUstep/System/Library/Headers  -L/usr/GNUstep/System/Library/Libraries
conftest.c -lcallback -lavcall -lnsl -ldl  -lz >&5
configure:16722: $? = 0
configure:16739: result: ffcall
configure:16751: checking if ffcall trampolines work
configure:16765: gcc -o conftest -g -O2 
-I/usr/GNUstep/System/Library/Headers  -L/usr/GNUstep/System/Library/Libraries
conftest.c -lcallback -lavcall -lnsl -ldl  -lz >&5
configure:16768: $? = 0
configure:16774: ./conftest
configure:16777: $? = 0
configure:16792: result: yes

And to make it complete. My original error was:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb713a6c0 (LWP 27073)]
0xb77965c4 in objc_msg_lookup () from /usr/lib/libobjc.so.2
(gdb) bt
#0  0xb77965c4 in objc_msg_lookup () from /usr/lib/libobjc.so.2
#1  0xb79ec040 in GSInvocationCallback (callback_data=0xb7b87330, 
    args=0xbff89694) at GSFFCallInvocation.m:1050
#2  0xb72bb6d5 in __vacall_r () from /usr/lib/libcallback.so.0
#3  0xb7b87330 in returnTypeInfo ()
   from /usr/GNUstep/System/Library/Libraries/libgnustep-base.so.1.17
#4  0xbff89694 in ?? ()
#5  0x0805c376 in -[MainController awakeFromNib] (self=0x8562e28, 
    _cmd=0xb7f3e508) at Source/MainController.m:199


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