使用cmake的共享库的未定义引用 [英] undefined reference with shared library using cmake
问题描述
我看了很多地方找到这个答案，但我还没有找到任何关于我的情况。这似乎很容易，这就是为什么这是如此令人沮丧。
I have looked a lot of placed to find this answer, but I have not been able to find anything that pertains to my situation. It seems so easy, which is why this is so frustrating.
我正在用CMAKE建立一个项目。我生成两个共享库。一个包括另一个。我也生成一个可执行文件。可执行文件链接到封装另一个的共享库。以下是代码的相关部分：
I am building a project with CMAKE. I am generating two shared libraries. One includes the other. I am also generating an executable. The executable is linking to the shared library that encapsulates the other one. Here is the relevant portion of the code:
################################################################################
# Make the shared libraries
################################################################################
# Standard stuff
add_library(er SHARED src/std_math.cc src/snapshot.cc)
include_directories(hdr)
target_link_libraries(er rt)
# DSP library
add_library(dsp SHARED src/dsp.cc)
include_directories(hdr)
target_link_libraries(dsp er /usr/lib/libfftw3f.so /usr/lib/libfftw3.so)
################################################################################
# Make an Executable
################################################################################
message("-- Making executable for testing --")
add_executable(er_test test/dsp_test.cc)
include_directories(hdr)
target_link_libraries(er_test dsp)
################################################################################
# What to do with make install
################################################################################
message ("-- Writting install scripts --")
# See if there is an install directory already assigned. If not, set it to the
# system default.
if (NOT DEFINED INSTALL_DIR)
set (INSTALL_DIR /usr/local/)
endif (NOT DEFINED INSTALL_DIR)
message (" -- install_dir = ${INSTALL_DIR}")
# Install the libraries and header files to the appropriate places
install (TARGETS er dsp DESTINATION ${INSTALL_DIR}/bin)
install (FILES hdr/dsp.hh hdr/snapshot.hh hdr/std_math.hh DESTINATION ${INSTALL_DIR}/include)
得到。
CMakeFiles/er_test.dir/test/dsp_test.cc.o: In function `main':
dsp_test.cc:(.text.startup+0x11e): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& operator<< <int>(std::basic_ostream<char, std::char_traits<char> >&, std::vector<int, std::allocator<int> > const&)'
dsp_test.cc:(.text.startup+0x142): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& operator<< <int>(std::basic_ostream<char, std::char_traits<char> >&, std::vector<int, std::allocator<int> > const&)'
dsp_test.cc:(.text.startup+0x166): undefined reference to `std::vector<int, std::allocator<int> > subvec<int>(std::vector<int, std::allocator<int> > const&, int, int, int)'
dsp_test.cc:(.text.startup+0x182): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& operator<< <int>(std::basic_ostream<char, std::char_traits<char> >&, std::vector<int, std::allocator<int> > const&)'
dsp_test.cc:(.text.startup+0x1b6): undefined reference to `std::vector<int, std::allocator<int> > subvec<int>(std::vector<int, std::allocator<int> > const&, int, int, int)'
还有更多的人来自那里。我已经尝试使用静态库，但后来它只是延迟问题，直到下一个可执行文件，我试图包括这些库。我也试过使用g ++而不是c ++。我试过交换图书馆订单。此外，它不是一个模板问题，因为它不能找到的至少一个引用不是模板函数。我已经搜索了图书馆的符号，我可以找到他们，虽然他们是前置和后置的随机字符。
and there are many more where those came from. I have tried using static libraries, but then it just delays the problem until the next executable I try to include these libraries into. I have also tried using g++ instead of c++. I've tried swapping around library orders. Also, it is not a template issue since at least one of the references it can't find is not a templated function. I have searched the libraries for the symbols, and I was able to find them, although they were prepended and postpended by random characters.
我不明白发生了什么。请帮助。
I don't understand what's going on. Please help.
感谢，
UPDATE
我找到了另一个链接，特别是这一个，提到了add_subdirectory的潜在问题。这是另一个项目的子项目。所以我送进了这个项目并建在那里。有效！它仍然不工作在父目录尽管。也许这可以给某人的线索。
I found another link, specifically this one, that mentioned potential problems with add_subdirectory. This is a subproject to another project. So I sent into the project and built there. It worked! It still doesn't work in the parent directory though. Maybe that can give clues to someone.
再次感谢，
推荐答案
包含CMakeLists.txt是运行时的当前目录。相反，每当需要相对于CMakeLists.txt的路径时，使用 $ {CMAKE_CURRENT_SOURCE_DIR} 。例如：
Don't assume that the directory containing CMakeLists.txt is the current directory at runtime. Instead, use ${CMAKE_CURRENT_SOURCE_DIR} whenever you want a path relative to the CMakeLists.txt. For example:
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/hdr)
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