Linking error on minimal example with Boost Iostreams. Looks like I have not linked with libboost_iostream, however CMake reports that library is found and other applications with Boost compile and link without any problems.
Using Cmake for build:
cmake_minimum_required(VERSION 3.0)
project(mmap_example CXX)
set(TARGET mmap_example)
set(BOOST_MIN_VERSION "1.61.0")
set(Boost_ADDITIONAL_VERSIONS "1.61.0" "1.61")
set(Boost_USE_STATIC_LIBS ON)
set(BOOST_ROOT ${MY_BOOST_DIR})
find_package(Boost ${BOOST_MIN_VERSION} COMPONENTS iostreams REQUIRED)
set(CMAKE_CXX_FLAGS "-std=c++11 -std=gnu++1y -pthread")
set(CMAKE_EXE_LINKER_FLAGS "-std=c++11 -std=gnu++1y -pthread")
file(GLOB SOURCES *.cpp)
include_directories(${Boost_INCLUDE_DIRS})
add_executable(${TARGET} ${SOURCES})
target_link_libraries(${TARGET} ${Boost_IOSTREAMS})
C++ itself:
#include <boost/iostreams/device/mapped_file.hpp>
namespace boost_io = boost::iostreams;
int main(int argc, char** argv) {
boost_io::mapped_file_source file(argv[1]);
return 0;
}
GCC output:
Linking CXX executable mmap_example
CMakeFiles/mmap_example.dir/mmap.cpp.o: In function boost::iostreams::mapped_file_source::mapped_file_source<char*>(char* const&, unsigned int, long long):
mmap.cpp:(.text._ZN5boost9iostreams18mapped_file_sourceC2IPcEERKT_jx[_ZN5boost9iostreams18mapped_file_sourceC5IPcEERKT_jx]+0x43): undefined reference to boost::iostreams::mapped_file_source::init()
gcc (Debian 4.9.2-10) 4.9.2
Cmake 3.0.2
Boost 1.61
I'm not sure that
${Boost_IOSTREAMS}
is the correct variable to use, AFAIK it should be${Boost_LIBRARIES}
(at least that is what I always use).You can check if the variable is really set by using
in your cmake file.
You can also use
to list all the commands, to check what libraries are present on the linker command line.