I am trying to make a CMake project for code that uses Boost libraries. I want to build it for Android, and I am using this project as a reference: https://code.google.com/p/android-cmake/.
I want to use Boost static libraries that I previously built for android and not make them part of the project to compile.
This is my CMakeLists.txt for the project part that uses Boost
#BOOST
set(BOOST_ROOT /home/neb/workspace/SDLActivityCMAKE/jni/boost)
set(Boost_INCLUDE_DIR /home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53)
set(BOOST_INCLUDEDIR /home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53)
set(Boost_LIBRARY_DIR /home/neb/workspace/SDLActivityCMAKE/jni/boost/lib)
set(BOOST_LIBRARYDIR /home/neb/workspace/SDLActivityCMAKE/jni/boost/lib)
set(Boost_USE_STATIC_LIBS ON)
set(USE_STATIC_BOOST ON)
set(Boost_USE_STATIC_RUNTIME ON)
set(BOOST_COMPILER gcc)
find_package(Boost COMPONENTS "thread-gcc-mt-1_53" "date_time-gcc-mt-1_53" REQUIRED)
include_directories(${Boost_INCLUDE_DIR})
link_directories(${Boost_LIBRARY_DIR})
#BOOSTEND
add_executable(main main.cpp)
target_link_libraries( main ${Boost_LIBRARIES} )
When I run regular cmake command (cmake .. from subdir of the jni folder in android project) there is no problem, cmake finds libraries. When I am making cmake to use android.toolchain.cmake provided by the project mentioned above I get this (I am using -DBoost_DEBUG option).
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:566 ] _boost_TEST_VERSIONS = 1.56.0;1.56;1.55.0;1.55;1.54.0;1.54;1.53.0;1.53;1.52.0;1.52;1.51.0;1.51;1.50.0;1.50;1.49.0;1.49;1.48.0;1.48;1.47.0;1.47;1.46.1;1.46.0;1.46;1.45.0;1.45;1.44.0;1.44;1.43.0;1.43;1.42.0;1.42;1.41.0;1.41;1.40.0;1.40;1.39.0;1.39;1.38.0;1.38;1.37.0;1.37;1.36.1;1.36.0;1.36;1.35.1;1.35.0;1.35;1.34.1;1.34.0;1.34;1.33.1;1.33.0;1.33
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:568 ] Boost_USE_MULTITHREADED = TRUE
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:570 ] Boost_USE_STATIC_LIBS = ON
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:572 ] Boost_USE_STATIC_RUNTIME = ON
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:574 ] Boost_ADDITIONAL_VERSIONS =
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:576 ] Boost_NO_SYSTEM_PATHS =
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:644 ] Declared as CMake or Environmental Variables:
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:646 ] BOOST_ROOT = /home/neb/workspace/SDLActivityCMAKE/jni/boost
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:648 ] BOOST_INCLUDEDIR = /home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:650 ] BOOST_LIBRARYDIR = /home/neb/workspace/SDLActivityCMAKE/jni/boost/lib
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:652 ] _boost_TEST_VERSIONS = 1.56.0;1.56;1.55.0;1.55;1.54.0;1.54;1.53.0;1.53;1.52.0;1.52;1.51.0;1.51;1.50.0;1.50;1.49.0;1.49;1.48.0;1.48;1.47.0;1.47;1.46.1;1.46.0;1.46;1.45.0;1.45;1.44.0;1.44;1.43.0;1.43;1.42.0;1.42;1.41.0;1.41;1.40.0;1.40;1.39.0;1.39;1.38.0;1.38;1.37.0;1.37;1.36.1;1.36.0;1.36;1.35.1;1.35.0;1.35;1.34.1;1.34.0;1.34;1.33.1;1.33.0;1.33
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:734 ] location of version.hpp: /home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53/boost/version.hpp
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:754 ] version.hpp reveals boost 1.53.0
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:786 ] guessed _boost_COMPILER = -gcc46
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:796 ] _boost_MULTITHREADED = -mt
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:839 ] _boost_RELEASE_ABI_TAG = -s
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:841 ] _boost_DEBUG_ABI_TAG = -sd
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:884 ] _boost_LIBRARY_SEARCH_DIRS = /home/neb/workspace/SDLActivityCMAKE/jni/boost/lib;/home/neb/workspace/SDLActivityCMAKE/jni/boost/lib;/home/neb/workspace/SDLActivityCMAKE/jni/boost/stage/lib;/home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53/lib;/home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53/../lib;/home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53/stage/lib;C:/boost/lib;C:/boost;/boost/boost_1_53_0/lib;/boost/boost_1_53/lib;/boost/lib;/boost;/sw/local/lib
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:962 ] Searching for THREAD-GCC-MT-1_53_LIBRARY_RELEASE: boost_thread-gcc-mt-1_53-gcc46-mt-s-1_53;boost_thread-gcc-mt-1_53-gcc46-mt-s;boost_thread-gcc-mt-1_53-mt-s-1_53;boost_thread-gcc-mt-1_53-mt-s;boost_thread-gcc-mt-1_53
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:994 ] Searching for THREAD-GCC-MT-1_53_LIBRARY_DEBUG: boost_thread-gcc-mt-1_53-gcc46-mt-sd-1_53;boost_thread-gcc-mt-1_53-gcc46-mt-sd;boost_thread-gcc-mt-1_53-mt-sd-1_53;boost_thread-gcc-mt-1_53-mt-sd;boost_thread-gcc-mt-1_53-mt;boost_thread-gcc-mt-1_53
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:962 ] Searching for DATE_TIME-GCC-MT-1_53_LIBRARY_RELEASE: boost_date_time-gcc-mt-1_53-gcc46-mt-s-1_53;boost_date_time-gcc-mt-1_53-gcc46-mt-s;boost_date_time-gcc-mt-1_53-mt-s-1_53;boost_date_time-gcc-mt-1_53-mt-s;boost_date_time-gcc-mt-1_53
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:994 ] Searching for DATE_TIME-GCC-MT-1_53_LIBRARY_DEBUG: boost_date_time-gcc-mt-1_53-gcc46-mt-sd-1_53;boost_date_time-gcc-mt-1_53-gcc46-mt-sd;boost_date_time-gcc-mt-1_53-mt-sd-1_53;boost_date_time-gcc-mt-1_53-mt-sd;boost_date_time-gcc-mt-1_53-mt;boost_date_time-gcc-mt-1_53
-- [ /usr/share/cmake-2.8/Modules/FindBoost.cmake:1108 ] Boost_FOUND = FALSE
CMake Error at /usr/share/cmake-2.8/Modules/FindBoost.cmake:1195 (message):
Unable to find the requested Boost libraries.
Boost version: 1.53.0
Boost include path:
/home/neb/workspace/SDLActivityCMAKE/jni/boost/include/boost-1_53
The following Boost libraries could not be found:
boost_thread-gcc-mt-1_53
boost_date_time-gcc-mt-1_53
No Boost libraries were found. You may need to set BOOST_LIBRARYDIR to the
directory containing Boost libraries or BOOST_ROOT to the location of
Boost.
Call Stack (most recent call first):
src/CMakeLists.txt:15 (find_package)
-- Configuring incomplete, errors occurred!
So I see that CMake is searching for libraries in this exact directory:
/home/neb/workspace/SDLActivityCMAKE/jni/boost/lib
In which there are compiled static libraries:
neb@neb-VirtualBox:~/workspace/SDLActivityCMAKE/jni/boost/lib$ ls -l
total 24440
-rwxrwxrwx 1 neb neb 557190 sie 27 12:36 libboost_date_time-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 1348474 sie 27 12:36 libboost_filesystem-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 827216 sie 27 12:36 libboost_iostreams-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 6813972 sie 27 12:36 libboost_program_options-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 12927086 sie 27 12:37 libboost_regex-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 1197696 sie 27 12:37 libboost_signals-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 159462 sie 27 12:36 libboost_system-gcc-mt-1_53.a
-rwxrwxrwx 1 neb neb 1177994 sie 27 12:37 libboost_thread-gcc-mt-1_53.a`
I set all variables pointing to BOOST directories I could find, I set variables saying that Boost libraries should be static, but it still doesn't find them. What else can I do?
Let me start by saying getting CMake to find Boost can be difficult because the automagic in FindBoost.cmake will bite you and KitWare the makers of CMake have some of the worst documentation of any popular project I've ever encountered. You'll have to walk through the source of FindBoost.cmake to debug it if it fails.
The directory you installed cross-compiled boost looks like this assuming 1.62.0
boost-arm-build/include
boost-arm-build/include/boost-1_62
boost-arm-build/lib
The call to CMake from Project-Build directory
cmake \
-DBoost_NO_SYSTEM_PATHS=TRUE \
-DBoost_ADDITIONAL_VERSIONS="1.62" \
-DCMAKE_TOOLCHAIN_FILE=../android.toolchain \
-DBOOST_ROOT="../boost-arm-build" \
../Project/
-DBoost_ADDITIONAL_VERSIONS - CMake looks for Boost using a hardcoded list of strings, if your CMake is older than the Boost version you're building it won't know where to look in the include directory so you'll need to pass it along. Although the version is actually 1.62.0, boost put the includes in boost-1_62 so I use 1.62 instead. In FindBoost.cmake you'll find each version is added twice, as in "1.62.0" "1.62" for this very reason.
You should also inspect the file names of the libraries you built, for my example let's look at system:
libboost_system-gcc-mt-1_62.a
libboost_system-gcc-mt-1_62.so # Symbolic link to libboost_system-gcc-mt-1_62.so.1.62.0
libboost_system-gcc-mt-1_62.so.1.62.0
libboost_system-gcc-mt-d-1_62.a
libboost_system-gcc-mt-d-1_62.so # Symbolic link to libboost_system-gcc-mt-d-1_62.so.1.62.0
libboost_system-gcc-mt-d-1_62.so.1.62.0
gcc - the compiler usedmt - multithreadedd - debug1_62 - the version of boost, obviouslyIf you see libboost_system.a instead it means you failed to build boost with --with-layout=versioned and should probably check out my SO Answer on building boost using the NDK. If you see clang instead of gcc it's great you've built boost with clang, but you'll probably need to inform CMake that clang exists using the Boost_COMPILER flag.
-DBoost_COMPILER="-clang"
set(CMAKE_SYSTEM_NAME Android)
set(CROSS_COMPILER_DIR /opt/ndk-R13-standalone)
set(CMAKE_C_COMPILER ${CROSS_COMPILER_DIR}/bin/arm-linux-androideabi-gcc)
set(CMAKE_CXX_COMPILER ${CROSS_COMPILER_DIR}/bin/arm-linux-androideabi-g++)
set(ANDROID_NATIVE_API_LEVEL android-19)
set(ANDROID_ABI armeabi-v7a)
set(ANDROID_STL gnustl_static)
set(CMAKE_SYSROOT ${CROSS_COMPILER_DIR}/sysroot)
set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
# search for programs in the build host directories
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)