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To:	khan AT NanoTech DOT Wisc DOT EDU, cygwin AT sourceware DOT cygnus DOT com,
	bug-gnu-utils AT gnu DOT org
Cc:	abegel AT cs DOT Berkeley DOT EDU
Subject:	g++/linker bug on cygwin1.1.0 (win32)
From:	Marat Boshernitsan <maratb AT cs DOT Berkeley DOT EDU>
Date:	08 May 2000 23:50:05 -0700
Message-ID:	<tfvr9bcjjz6.fsf@sequoia.cs.berkeley.edu>
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Hello,

I've hit upon an obscure g++/linker bug on Cygwin1.1.0 which causes the
resulting executable to have "call 0x0" instructions in a few places
instead of proper calls.  The attached testcase (together with the
Makefile) demonstrates the problem: just do make and run one of the
resulting "bug*" executables to get a runtime error.

Few points of interest:

- the test case is fairly obscure, but it is distilled from a much
larger system.

- if the return type of the argument type of "void* __stdcall
I_RpcAllocate(unsigned int);" declaration in dlltest.cc are modified in
any way the problem goes away.  (This declaration is not random: I
actually pulled it out of one of the cygwin header files -- rpcdcep.h --
after several hours of chasing this down).

- if the order of object files is changed during linking the problem
goes away


My environment is:

uname -a:
CYGWIN_NT-4.0 DOGWOOD 1.1.0(0.17/3/2) 2000-03-01 00:15:19 i686 unknown

gcc -v:
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2/specs
gcc version 2.95.2 19991024 (release)

ld -v:
GNU ld version 19990818 (with BFD 19990818)

as -v:
GNU assembler version 19990818 (i686-pc-cygwin) using BFD version 19990818


Any help, hints, or workarounds will be greatly appreciated.

Thanks,

Marat.


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