While using CMake to compile a simple c++ code containing boost library utilization, I encountered the following linkage problem:
For reference, the code I was trying to compile was the following ( a simple zipping and reading from a zipped file).:
#include <fstream>
SET(BOOST_LIBDIR ${BOOST_DIR}/lib64)
main.cpp:(.text._ZN5boost9iostreams6detail9close_allINS0_21basic_gzip_compressorISaIcEEENS1_16linked_streambufIcSt11char_traitsIcEEEEEvRT_RT0_[void
boost::iostreams::detail::close_all
>, boost::iostreams::detail::linked_streambuf > >(boost::iostreams::basic_gzip_compressor
>&, boost::iostreams::detail::linked_streambuf >&)]+0x18e): undefined reference to
`boost::iostreams::detail::zlib_base::reset(bool, bool)'
collect2: ld returned 1 exit status
make[2]: *** [test.exe] Error 1
make[1]: *** [CMakeFiles/test.exe.dir/all] Error 2
make: *** [all] Error 2
For reference, the code I was trying to compile was the following ( a simple zipping and reading from a zipped file).:
#include <fstream>
#include <iostream> #include <boost/iostreams/device/file.hpp> #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/copy.hpp> #include <boost/iostreams/filter/gzip.hpp> using namespace std; using namespace boost::iostreams; int main() { //The following code decompresses data from a file and writes it to standard output. ifstream file("hello.txt.gz", ios_base::in | ios_base::binary); filtering_streambuf<input> in; in.push(gzip_decompressor()); in.push(file); boost::iostreams::copy(in, cout); boost::iostreams::filtering_ostream geometry; geometry.push(boost::iostreams::gzip_compressor(boost::iostreams::gzip::best_compression)); // Generating a Zip file string filename = "example1.txt.gz"; filtering_ostream out; unsigned int compressionLevel = boost::iostreams::gzip::best_compression; out.push(gzip_compressor(compressionLevel)); out.push(file_sink(filename.c_str(), std::ios::binary)); out << "This is a gz file\n"; out << "This is the second line\n"; }
How I solved this problem is as follows:
1) I already had the following setting in the CMakeList.txt file:SET(BOOST_DIR /usr/intel/pkgs/boost/1.54.0-gcc-4.7.2 CACHE PATH "Boost directory")
2) Then, I added the bold and red lines below to have it compile without linkage error (the black lines already existed)
SET(BOOST_LIB -L${BOOST_LIBDIR} boost_thread.a pthread.a )
SET(BOOST_INCLUDE_DIR ${BOOST_DIR}/include )
LINK_DIRECTORIES(${BOOST_LIBDIR})
INCLUDE_DIRECTORIES(${BOOST_INCLUDE_DIR} )
find_package(Boost COMPONENTS system filesystem iostreams regex REQUIRED)
set (EXE test.exe)
add_executable(${EXE} main.cpp )
TARGET_LINK_LIBRARIES(${EXE} ${Boost_LIBRARIES} )
This made the trick and it worked without problems
