CODEWITHSUNDEEP
cmake
Reuben Morais
Reuben Morais

Reputation: 1021

How to stop CMake from linking against libstdc++

I have a very simple CMakeLists.txt for a C++ project, which builds a shared library:

add_library(foo SHARED
    ${HDR_PUBLIC}
    ${SOURCES})

When linking the library, CMake automatically uses -lstdc++. How can I stop it from doing this?

Upvotes: 16

Views: 21592

Answers (2)

andrewrk
andrewrk

Reputation: 31142

set(CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "")
set(CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES "")
set_target_properties(yourtarget PROPERTIES LINKER_LANGUAGE C)

Source: http://cmake.3232098.n2.nabble.com/setting-LINKER-LANGUAGE-still-adds-lstdc-td7581940.html

Upvotes: 6

user2288008
user2288008

Reputation:

You can add -stdlib=libc++ to compiler flags.

Simple example:

cmake_minimum_required(VERSION 2.8.4)
project(test)
set(CMAKE_VERBOSE_MAKEFILE TRUE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -v -stdlib=libc++")
add_executable(test main.cpp)

Give output:

"/usr/bin/ld" ... -o test ... -lc++ ...

By default:

cmake_minimum_required(VERSION 2.8.4)
project(test)
set(CMAKE_VERBOSE_MAKEFILE TRUE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -v")
add_executable(test main.cpp)

Link to stdc++:

"/usr/bin/ld" ... -o test ... -lstdc++ ...

[update]

If you don't need to link to c++ lib at all - use '-nodefaultlibs' as linker flag and '-nostdinc++' to compiler flag. You may need to link some default libraries, like '-lSystem'.

Upvotes: 10

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