CODEWITHSUNDEEP
c++cmakeantlrld
warran
warran

Reputation: 184

C++ dynamic and static libraries linking with CMake

I need some help with C++ compilation, as I'm obviously missing something.

I've created .so library (let's call it mylib) depending on other .so library I wrote (mylib2) and some simple program using it. Also the second library depends on ANTLR. I use CMake for building both libs and they are compiling and installing just fine. But when I try to compile the program:

cmd> g++ program.cpp -lmylib

I get 

/usr/local/lib/libmylib2.so.0: undefined reference to `antlr::CharScanner::traceOut(char const*)'

ANTLR appears to be static lib, so I tried

cmd> g++ program.cpp -lmylib -Wl,-Bstatic -lantlr

But then all I get is

/usr/bin/ld: cannot find -lgcc_s

I've got two questions here:

1) Why can't mylib2 see antlr? I should mention, that I use my own cmake find script, can this be a problem?

find_package(ANTLR REQUIRED)
include_directories(${ANTLR_INCLUDE_DIR})

2) What does the second error mean? Why can't ld find libgcc_s?

I will really appreciate any help.

EDIT

I should mention I am using ANTLR 2.7

Upvotes: 0

Views: 1143

Answers (1)

user3159253
user3159253

Reputation: 17455

From man ld (GNU ld): -Bstatic - Do not link against shared libraries. You may use this option multiple times on the command line: it affects library searching for -l options which follow it. So you should manually enable using dynamic libraries after -lantlr. Please remember, that linking a static library not being compiled with -fPIC option may result in non-relocatable code and longer application startup time http://www.airs.com/blog/archives/41

Upvotes: 1

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