Static link libstdc++ using clang

Question

When I use GCC, I can build program on my Ubuntu 15.04 using this:

-static-libgcc -static-libstdc++

And compiled binary can run on "stock" Ubuntu 14.04 without any external packages, only standard updates.

Is there possibility do build with this static linking to library with clang ?

Most common answers:

• using test ubuntu rep ( ppa:ubuntu-toolchain-r/test )
• update server
• recompile on target server
• don't use GCC

is not suitable for me.

Just can I do this with clang for run it on Ubuntu 14.04.3 LTS?

Answer 1

clang is compatible with gcc on this matter. Basically for hello-world program that uses iostream to ensure libstdc++ requirement (actual lib versions may vary between distributions):

$ clang++ test.cpp
$ ldd ./a.out
        linux-vdso.so.1 (0x00007ffec65c0000)
        libstdc++.so.6 => /usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/libstdc++.so.6 (0x00007ff937bb6000)
        libm.so.6 => /lib64/libm.so.6 (0x00007ff9378b6000)
        libgcc_s.so.1 => /usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/libgcc_s.so.1 (0x00007ff93769e000)
        libc.so.6 => /lib64/libc.so.6 (0x00007ff9372fe000)
        /lib64/ld-linux-x86-64.so.2 (0x00007ff937f3e000)

Here is a dependency for libstdc++ and libgcc_s . But if you add -static-libgcc -static-libstdc++ :

$ clang++ test.cpp -static-libgcc -static-libstdc++
$ ldd ./a.out
        linux-vdso.so.1 (0x00007ffe5d678000)
        libm.so.6 => /lib64/libm.so.6 (0x00007fb8e4516000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fb8e4176000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fb8e4816000)

That still leaves dependency on libc , but that is a different question.

clang: warning: argument unused during compilation: '-static-libstdc++' means clang ignored this flag, because flag is useless in current situation. First two examples that coming to mind is compiling C code (which obviously don't depend on libstdc++), or issuing compile-only command without linking ( -c flag). Since .o file cannot hold information about static or dynamic linking, this flag have to be specified on linking phase (and, to avoid warning, only on linking phase).

Answer 2

Instead of using -static-libstdc++ or -static-libgcc, just use clang's -static flag. It will produce a non dynamic executable, with everything it needs linked in statically.

On my test program, it produces:

[root@interserver ogrerobot.com]# ldd ./CppUtilsSpikes  
not a dynamic executable