How to tell ld where to find libc

3
votes

So I created a static library with some basic assistance functions in C++ today. I built it with Clang 3.2 (SVN snapshot). However when I try to run a test program that links to it (prog.cpp), I get the following error:

~/Projects/CPP/AssisterLib> g++ prog.cpp -o program -static -L. -lassister
/usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../x86_64-suse-linux/bin/ld: cannot find -lm
/usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../x86_64-suse-linux/bin/ld: cannot find -lc
collect2: ld returned 1 exit status

I get the same error with G++ and Clang++. Apparently it can't find libc.a and libm.a, which are both in /usr/lib64 (provided by glibc-devel in OpenSUSE). Adding -L/usr/lib64 does nothing for the error.

Why can't ld find those libraries? Is there a flag that I'm missing?

1
c++gcclinkerclangopensuse
try adding -Wl,--verbose, this will tell linker show its attempts to find library. - Lol4t0

1 Answers

3
votes

The problem is likely the use of -static. I would conclude you do not have static version of the libm and libc installed. You can try removing -static to confirm.

The -static flag signals to the compiler that you want your executable to be entirely statically linked, and so it fails if not all the libraries have static versions available.