Alessandro Bertulli
Reputation: 500
Why can't my custom cross GCC find some libraries in the sysroot, even if it searches in the right place?
I'm trying to cross compile a C/C++ application, and since it needs an old version of libc, I compiled a custom GCC without --with-sysroot flag, and I use as sysroot a copy of the target root filesystem. However, it can't find some libraries as Glog, even if the .so files are present in the sysroot. Using a native compilation, everything is fine (si I guess the CMakeLists is good?), but when cross compiling I get:
/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/bin/ld: warning: libgflags.so.2, needed by /opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so, not found (try using -rpath or -rpath-link)
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so: undefined reference to `google::FlagRegisterer::FlagRegisterer(char const*, char const*, char const*, char const*, void*, void*)'
collect2: error: ld returned 1 exit status
If I use as compiler flag -v:
[ 42%] Linking CXX executable single_lidar_listener
Using built-in specs.
COLLECT_GCC=/opt/cross/bin/arm-linux-gnueabihf-g++
COLLECT_LTO_WRAPPER=/opt/cross/libexec/gcc/arm-linux-gnueabihf/6.3.0/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../gcc-6.3.0/configure --prefix=/opt/cross --target=arm-linux-gnueabihf --enable-languages=c,c++ --disable-multilib -v --enable-shared --enable-linker-build-id --enable-threads=posix --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --enable-default-pie --with-system-zlib --disable-browser-plugin --enable-gtk-cairo --with-arch-directory=arm --enable-multiarch --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb --with-target-system-zlib --disable-sjlj-exceptions --enable-checking=release --without-included-gettext
Thread model: posix
gcc version 6.3.0 (GCC)
COMPILER_PATH=/opt/cross/libexec/gcc/arm-linux-gnueabihf/6.3.0/:/opt/cross/libexec/gcc/arm-linux-gnueabihf/6.3.0/:/opt/cross/libexec/gcc/arm-linux-gnueabihf/:/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/:/opt/cross/lib/gcc/arm-linux-gnueabihf/:/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/bin/
LIBRARY_PATH=/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/:/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/:/opt/box-root-fs/lib/arm-linux-gnueabihf/:/opt/box-root-fs/lib/:/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/:/opt/box-root-fs/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-g' '-o' 'single_lidar_listener' '-L/opt/box-root-fs/lib' '-L/opt/box-root-fs/usr/lib' '-L/opt/box-root-fs/usr/local/lib' '-shared-libgcc' '-march=armv7-a' '-mfloat-abi=hard' '-mfpu=vfpv3-d16' '-mthumb' '-mtls-dialect=gnu'
/opt/cross/libexec/gcc/arm-linux-gnueabihf/6.3.0/collect2 -plugin /opt/cross/libexec/gcc/arm-linux-gnueabihf/6.3.0/liblto_plugin.so -plugin-opt=/opt/cross/libexec/gcc/arm-linux-gnueabihf/6.3.0/lto-wrapper -plugin-opt=-fresolution=/tmp/ccvlXVsC.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --sysroot=/opt/box-root-fs --build-id --eh-frame-hdr -dynamic-linker /lib/ld-linux-armhf.so.3 -X -m armelf_linux_eabi -pie -o single_lidar_listener /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/Scrt1.o /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/crti.o /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/crtbeginS.o -L/opt/box-root-fs/lib -L/opt/box-root-fs/usr/lib -L/opt/box-root-fs/usr/local/lib -L/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0 -L/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib -L/opt/box-root-fs/lib/arm-linux-gnueabihf -L/opt/box-root-fs/lib -L/opt/box-root-fs/usr/lib/arm-linux-gnueabihf -L/opt/box-root-fs/usr/lib CMakeFiles/single_lidar_listener.dir/single_lidar.cpp.o CMakeFiles/single_lidar_listener.dir/sick_scan_xd_api_wrapper.c.o -rpath /lib:/usr/lib:/usr/local/lib -lglog libtoojpeg.a -ldl -lrt -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/crtendS.o /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/crtn.o
/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/bin/ld: warning: libgflags.so.2, needed by /opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so, not found (try using -rpath or -rpath-link)
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so: undefined reference to `google::FlagRegisterer::FlagRegisterer(char const*, char const*, char const*, char const*, void*, void*)'
collect2: error: ld returned 1 exit status
and with -Wl,--verbose
[ 71%] Linking CXX executable single_lidar_listener
GNU ld (GNU Binutils) 2.28
Supported emulations:
armelf_linux_eabi
armelfb_linux_eabi
using internal linker script:
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/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/Scrt1.o
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CMakeFiles/single_lidar_listener.dir/single_lidar.cpp.o
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attempt to open libgcc_s.so.1 failed
attempt to open /opt/box-root-fs/lib/libgcc_s.so.1 failed
attempt to open /opt/box-root-fs/usr/lib/libgcc_s.so.1 failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc_s.so.1 failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc_s.so.1 failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so.1 succeeded
libgcc_s.so.1 (/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so.1)
attempt to open /opt/box-root-fs/lib/libgcc.so failed
attempt to open /opt/box-root-fs/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.so failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.a succeeded
attempt to open /opt/box-root-fs/lib/libgcc.so failed
attempt to open /opt/box-root-fs/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.so failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.a succeeded
attempt to open /opt/box-root-fs/lib/libc.so failed
attempt to open /opt/box-root-fs/lib/libc.a failed
attempt to open /opt/box-root-fs/usr/lib/libc.so failed
attempt to open /opt/box-root-fs/usr/lib/libc.a failed
attempt to open /opt/box-root-fs/usr/local/lib/libc.so failed
attempt to open /opt/box-root-fs/usr/local/lib/libc.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libc.so failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libc.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libc.so succeeded
opened script file /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libc.so
opened script file /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libc.so
attempt to open /opt/cross/arm-linux-gnueabihf/lib/libc.so.6 succeeded
/opt/cross/arm-linux-gnueabihf/lib/libc.so.6
attempt to open /opt/cross/arm-linux-gnueabihf/lib/libc_nonshared.a succeeded
(/opt/cross/arm-linux-gnueabihf/lib/libc_nonshared.a)elf-init.oS
attempt to open /opt/cross/arm-linux-gnueabihf/lib/ld-linux-armhf.so.3 succeeded
/opt/cross/arm-linux-gnueabihf/lib/ld-linux-armhf.so.3
/opt/cross/arm-linux-gnueabihf/lib/ld-linux-armhf.so.3
attempt to open /opt/box-root-fs/lib/libgcc_s.so failed
attempt to open /opt/box-root-fs/lib/libgcc_s.a failed
attempt to open /opt/box-root-fs/usr/lib/libgcc_s.so failed
attempt to open /opt/box-root-fs/usr/lib/libgcc_s.a failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc_s.so failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc_s.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc_s.so failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc_s.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so succeeded
opened script file /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so
opened script file /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so
attempt to open libgcc_s.so.1 failed
attempt to open /opt/box-root-fs/lib/libgcc_s.so.1 failed
attempt to open /opt/box-root-fs/usr/lib/libgcc_s.so.1 failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc_s.so.1 failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc_s.so.1 failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so.1 succeeded
libgcc_s.so.1 (/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/libgcc_s.so.1)
attempt to open /opt/box-root-fs/lib/libgcc.so failed
attempt to open /opt/box-root-fs/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.so failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.a succeeded
attempt to open /opt/box-root-fs/lib/libgcc.so failed
attempt to open /opt/box-root-fs/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/lib/libgcc.a failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.so failed
attempt to open /opt/box-root-fs/usr/local/lib/libgcc.a failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.so failed
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/libgcc.a succeeded
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/crtendS.o succeeded
/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/crtendS.o
attempt to open /opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/crtn.o succeeded
/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/lib/crtn.o
libgflags.so.2 needed by /opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so
attempt to open /opt/cross/arm-linux-gnueabihf/lib/libgflags.so.2 failed
attempt to open /opt/cross/arm-linux-gnueabihf/lib/libgflags.so.2 failed
libpthread.so.0 needed by /opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so
found libpthread.so.0 at /opt/cross/arm-linux-gnueabihf/lib/libpthread.so.0
ld-linux-armhf.so.3 needed by /opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so
found ld-linux-armhf.so.3 at /opt/cross/arm-linux-gnueabihf/lib/ld-linux-armhf.so.3
/opt/cross/lib/gcc/arm-linux-gnueabihf/6.3.0/../../../../arm-linux-gnueabihf/bin/ld: warning: libgflags.so.2, needed by /opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so, not found (try using -rpath or -rpath-link)
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libglog.so: undefined reference to `google::FlagRegisterer::FlagRegisterer(char const*, char const*, char const*, char const*, void*, void*)'
Note that the compilation gives problems too, but goes fine if I manually specify in the CMakeLists.txt ${SYSROOT}/usr/include as an header path.
and I can see the libraries in the correct place:
$ find /opt/box-root-fs/usr/ -name *gflags*
/opt/box-root-fs/usr/include/gflags
/opt/box-root-fs/usr/include/gflags/gflags_completions.h
/opt/box-root-fs/usr/include/gflags/gflags_gflags.h
/opt/box-root-fs/usr/include/gflags/gflags_declare.h
/opt/box-root-fs/usr/include/gflags/gflags.h
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags_nothreads.so
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags_nothreads.so.2
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags_nothreads.a
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags.so
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags.so.2.1.2
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/cmake/gflags
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/cmake/gflags/gflags-config.cmake
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/cmake/gflags/gflags-export.cmake
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/cmake/gflags/gflags-export-release.cmake
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/cmake/gflags/gflags-config-version.cmake
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags_nothreads.so.2.1.2
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags.a
/opt/box-root-fs/usr/lib/arm-linux-gnueabihf/libgflags.so.2
where /opt/box-root-fs is where I copied the sysroot. As a workaround, I can succesfully compile by manually specifying link_libraries(gflags), but I was wondering why GCC stops searching for the libraries, even if they are obviously in the right place? Thanks!
Upvotes: 0
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