Re: [uclibc-ng-devel] undefined reference to `dl_iterate_phdr'

Hi Max, Max Filippov wrote,

Hi Waldemar,

I see a number of buildroot build issues with the post-unification uclibc-ng versions (1.0.18 and 1.0.19) related to dl_iterate_phdr used in static builds. E.g.:

...

  xtensa |                   autossh-1.4e | http://autobuild.buildroot.net/results/96807eda8a4b5a25225a82d7dd2b352b84fc3ddf
  xtensa |              berkeleydb-5.3.28 | http://autobuild.buildroot.net/results/886aecbbd664d11383c11c6cd9434a52f9c82b46
  xtensa |                    dvblast-3.0 | http://autobuild.buildroot.net/results/29ad877562d27896e3d68c06b8c1e3970750b51a

In fact the toolchain cannot produce static executable image unless extra -lc is given to the linker.

The failure looks like this:

xtensa-buildroot-linux-uclibc-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -o autossh autossh.o -lnsl xtensa-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-fde-dip.o): In function `__gthread_mutex_lock': xtensa-buildroot-linux-uclibc/libgcc/./gthr-default.h:748: undefined reference to `dl_iterate_phdr'

A short test with OpenADK gives a working autossh binary: wbx@helium:~/openadk $ file root_qemu-xtensa_uclibc-ng_dc233c/usr/bin/autossh root_qemu-xtensa_uclibc-ng_dc233c/usr/bin/autossh: ELF 32-bit LSB executable, Tensilica Xtensa, version 1 (SYSV), statically linked, stripped

/toolchain_qemu-xtensa_uclibc-ng_dc233c/usr/bin/xtensa-openadk-linux-uclibc-gcc -v < Using built-in specs. COLLECT_GCC=./toolchain_qemu-xtensa_uclibc-ng_dc233c/usr/bin/xtensa-openadk-linux-uclibc-gcc COLLECT_LTO_WRAPPER=/home/wbx/openadk/toolchain_qemu-xtensa_uclibc-ng_dc233c/usr/libexec/gcc/xtensa-openadk-linux-uclibc/6.2.0/lto-wrapper Target: xtensa-openadk-linux-uclibc Configured with: /home/wbx/openadk/toolchain_build_qemu-xtensa_uclibc-ng_dc233c/w-gcc-6.2.0-1/gcc-6.2.0/configure --prefix=/home/wbx/openadk/toolchain_qemu-xtensa_uclibc-ng_dc233c/usr --with-bugurl=http://www.openadk.org/ --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=xtensa-openadk-linux-uclibc --with-gmp=/home/wbx/openadk/host_x86_64-linux-gnu/usr --with-mpfr=/home/wbx/openadk/host_x86_64-linux-gnu/usr --with-libelf=/home/wbx/openadk/host_x86_64-linux-gnu/usr --disable-__cxa_atexit --with-system-zlib --with-gnu-ld --with-gnu-as --disable-libsanitizer --disable-install-libiberty --disable-libitm --disable-libmudflap --disable-libgomp --disable-libcilkrts --disable-libquadmath --disable-libquadmath-support --disable-decimal-float --disable-libstdcxx-pch --disable-ppl-version-check --disable-cloog-version-check --without-ppl --without-cloog --without-isl --disable-werror --disable-nls --disable-lto --enable-tls --enable-threads --enable-libatomic --disable-shared --disable-libssp --disable-biarch --disable-multilib --enable-languages=c --with-build-sysroot='/../../target_qemu-xtensa_uclibc-ng_dc233c' --with-sysroot='/../../target_qemu-xtensa_uclibc-ng_dc233c' Thread model: posix gcc version 6.2.0 (GCC)

I recheck later with autossh 1.4e, as I only used 1.4b. Latest uClibc-ng git used. But I don't see relevant changes to 1.0.19 release.

best regards Waldemar