Re: [Offtopic] C++-coded-packages
On 28 Aug 1997, Guy Maor wrote:
> Jason Gunthorpe <jgg@gpu.srv.ualberta.ca> writes:
>
> > That reminds me, why do a number of programs use libg++ when they never
> > call any of the special GNU C++ functions?
>
> g++ links in libg++ and stdc++ by default. Link with gcc to prevent
> this.
I suppose I should restate the question to what I was really thinking,
why does the linker link to shared libraries that are not used in any way
in the code?
If I can compile code with gcc and the proper -L lines, shouldn't the
linker be smart enough to remove unneeded files?
Look at your example below, g++ included libm and libg++, neither of them
are used.
Jason
> $ cat a.cc
> #include <iostream.h>
> int main() { cout << "hello, world\n"; }
> $ g++ -c a.cc
> $ g++ a.o
> $ ldd a.out
> libg++.so.272 => /usr/lib/libg++-dbg/libg++.so.272 (0x4000e000)
> libstdc++.so.272 => /usr/lib/libg++-dbg/libstdc++.so.272 (0x40047000)
> libm.so.6 => /lib/libm.so.6 (0x4007e000)
> libc.so.6 => /lib/libc.so.6 (0x40097000)
> /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
> $ ./a.out
> hello, world
> $ gcc a.o -lstdc++
> $ ldd a.out
> libstdc++.so.272 => /usr/lib/libg++-dbg/libstdc++.so.272 (0x4000e000)
> libc.so.6 => /lib/libc.so.6 (0x40045000)
> /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
> $ ./a.out
> hello, world
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