Why target program depends from system GCC

Why target program depends from system GCC

[niXman]

Hi,

I have built & installed GCC-4.9.2 in '/usr/local'.
When I build some program, it depends from libstdc++ provided by system, 
but not installed GCC-4.9.2. Why?

gcc flags:
--prefix=/usr/local
--host=x86_64-linux-gnu
--build=x86_64-linux-gnu
--target=x86_64-linux-gnu
--enable-bootstrap
--disable-nls
--disable-multilib
--enable-languages=c,c++
--enable-threads=posix
--enable-libstdcxx-time=yes
--disable-werror
--with-tune=generic
--enable-checking=release


program compiled:
g++ hello.cpp -ohello

show deps:
ldd ./hello
linux-vdso.so.1 =>  (0x00007fff60bfe000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 
(0x00007f5793bb1000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f57938ab000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 
(0x00007f5793694000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f57932ce000)
/lib64/ld-linux-x86-64.so.2 (0x00007f5793ee2000)


Ubuntu-14.10-x86_64 is used.


-- 
Regards, niXman
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Re: Why target program depends from system GCC

[Jonathan Wakely]

On 9 November 2014 17:13, niXman wrote:
>
> Hi,
>
> I have built & installed GCC-4.9.2 in '/usr/local'.
> When I build some program, it depends from libstdc++ provided by system, but
> not installed GCC-4.9.2. Why?

Because you didn't say you wanted something different, so the dynamic
linker looks in the normal places it looks to find library
dependencies.

https://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.how_to_set_paths