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Date: Thu, 24 Jan 2002 10:29:32 -0800
From: "H . J . Lu" <address@hidden>
To: Carlo Wood <address@hidden>
Cc: GNU C Library <address@hidden>,
	address@hidden
Subject: Re: Symbol versioning problem?  Different versions of same symbol being called.
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In-Reply-To: <address@hidden>; from address@hidden on Thu, Jan 24, 2002 at 07:25:23PM +0100

On Thu, Jan 24, 2002 at 07:25:23PM +0100, Carlo Wood wrote:
> 
> 4) Linking semwrapper.o --> libcwd.so.0.99.16 libcwd.so
> =======================================================
> 
> # mv -f semwrapper.o semwrapper.lo
> # gcc-3.0.3 -shared  threading.lo elf32.lo bfd.lo debug.lo debugmalloc.lo demangle.lo demangle3.lo semwrapper.lo strerrno.lo type_info.lo -Wl,--whole-archive utils/.libs/libutils.al -Wl,--no-whole-archive  utils/.libs/libutils.al -ldl   -Wl,-soname -Wl,libcwd.so.0 -o .libs/libcwd.so.0.99.16 -v -save-temps
> Reading specs from /usr/local/gcc-3.0.3/lib/gcc-lib/i686-pc-linux-gnu/3.0.3/specs
> Configured with: /usr/src/gcc/gcc-3.0.3/configure --prefix=/usr/local/gcc-3.0.3 --enable-shared --with-gnu-as --with-gnu-ld --enable-languages=c++ --enable-debug --enable-threads
> Thread model: posix
> gcc version 3.0.3
>  /usr/local/gcc-3.0.3/lib/gcc-lib/i686-pc-linux-gnu/3.0.3/collect2 -m elf_i386 -shared -o .libs/libcwd.so.0.99.16 /usr/lib/crti.o /usr/local/gcc-3.0.3/lib/gcc-lib/i686-pc-linux-gnu/3.0.3/crtbeginS.o -L/usr/local/gcc-3.0.3/lib/gcc-lib/i686-pc-linux-gnu/3.0.3 -L/usr/local/gcc-3.0.3/lib/gcc-lib/i686-pc-linux-gnu/3.0.3/../../.. -rpath /usr/local/gcc-3.0.3/lib: threading.lo elf32.lo bfd.lo debug.lo debugmalloc.lo demangle.lo demangle3.lo semwrapper.lo strerrno.lo type_info.lo --whole-archive utils/.libs/libutils.al --no-whole-archive utils/.libs/libutils.al -ldl -soname libcwd.so.0 -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/local/gcc-3.0.3/lib/gcc-lib/i686-pc-linux-gnu/3.0.3/crtendS.o /usr/lib/crtn.o
> 
> As you see, -lc is present.
> 

I know why. All threaded applications, include shared libraries, have
to be linked against -lpthread. Otherwise, you won't get the right
symbol version.


H.J.