c++ - CMake cross compile -


i'm having problem cmake cross compiler project.

my cross compiler did not find used libraries. setup cross compiler tutorial cross compiler.

now need libs installed on raspberrypi. have snychronised /lib , /usr direcotry pi computer in /opt/cross/rasp. toolchain file:

# 1 important set(cmake_system_name linux) #this 1 not set(cmake_system_version 1)  # specify cross compiler set(cmake_c_compiler /opt/cross/x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc)  set(cmake_cxx_compiler /opt/cross/x-tools/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-g++)  # target environment set(cmake_find_root_path /opt/cross/rasp)  # search programs in build host directories set(cmake_find_root_path_mode_program never) # libraries , headers in target directories set(cmake_find_root_path_mode_library only) set(cmake_find_root_path_mode_include only)

but when try compile program following linking error:

/opt/cross/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.9.1/../../../../arm-unknown-linux-gnueabi/bin/ld: warning: libltdl.so.7, needed /opt/cross/rasp/usr/local/lib/libgphoto2.so, not found (try using -rpath or -rpath-link) /opt/cross/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/4.9.1/../../../../arm-unknown-linux-gnueabi/bin/ld: warning: libexif.so.12, needed /opt/cross/rasp/usr/local/lib/libgphoto2.so, not found (try using -rpath or -rpath-link)

on raspberrpi compiling without errors possible.

the problem seems link misinterpretation of etc/ld.so.conf see fixing-rpath-link-issues-with-cross-compilers

in order add missing rpath-link, can append toolchain cmake file :

set(cmake_exe_linker_flags "-wl,-rpath-link=/opt/cross/rasp/lib/arm-linux-gnueabihf:/opt/cross/rasp/usr/lib/arm-linux-gnueabihf")

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