Unable to install the library using provided CMakeLists.txt

[alphahmed]

Library installation instructions would be greatly appreciated!

Upon trying to install the library using cmake... The following results:

-- The CXX compiler identification is GNU 8.4.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/local/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found ZLIB: /usr/lib64/libz.so (found version "1.2.7")
-- Found BZip2: /usr/lib64/libbz2.so (found version "1.0.6")
-- Looking for BZ2_bzCompressInit
-- Looking for BZ2_bzCompressInit - found
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
CMake Error at CMakeLists.txt:17 (add_library):
  add_library INTERFACE library requires no source arguments.


CMake Error at CMakeLists.txt:19 (target_sources):
  Cannot specify sources for target "kseq++" which is not built by this
  project.


CMake Error at CMakeLists.txt:21 (target_include_directories):
  Cannot specify include directories for target "kseq++" which is not built
  by this project.


CMake Error at CMakeLists.txt:28 (target_link_libraries):
  Cannot specify link libraries for target "kseq++" which is not built by
  this project.


-- Configuring incomplete, errors occurred!

[cartoonist]

add_library call at line 17 of CMakeLists.txt does not specify any source arguments:

add_library(kseq++ INTERFACE)

So, I cannot understand why it complains about it. Other three errors (lines 19, 21, and 28) are because of failing to define target kseq++ at line 17.

Which version of CMake are you using? What happens if you comment out line 19 since this line is the only line providing source arguments?

[cartoonist]

Regarding installation guide, I am going to include some guides and examples. Meanwhile, the usual way should work with CMake 3.13+:

$ mkdir build
$ cd build
$ cmake /path/to/kseq++
$ make
$ sudo make install

Since it is a header-only library, there is nothing to build except generating the config.h for version management and pkg-config file kseq++.pc. And, make install only copies required files to the usual destinations.

If you are using CMake in your project, you can alternatively include the library in your source tree as a git submodule. Then, calling add_subdirectory(/path/to/kseq++) in your CMakeLists.txt will define kseq++::kseq++ target which can be used to link kseq++ library to your executable or library. For example:

add_subdirectory(ext/kseq++)
add_executable(your_target main.cpp)
target_include_directories(your_target PUBLIC kseq++::kseq++)
target_link_libraries(your_target PUBLIC kseq++::kseq++)

[alphahmed]

Thank you!
It all worked out fine, using cmake 3.18.0-rc1