undefined reference to `dl_iterate_phdr'
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/96807eda8a4b5a25225a82d7dd2b352b84fc3... xtensa | berkeleydb-5.3.28 | http://autobuild.buildroot.net/results/886aecbbd664d11383c11c6cd9434a52f9c82... xtensa | dvblast-3.0 | http://autobuild.buildroot.net/results/29ad877562d27896e3d68c06b8c1e3970750b...
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' and is caused by the reference to dl_iterate_phdr from the DWARF unwinder in the libgcc. The linker command line parameters are the following (irrelevant paths stripped): -o autossh crt1.o crti.o crtbegin.o autossh.o -lnsl -lgcc -lc -lgcc crtend.o crtn.o The chain of dependencies is the following: usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(init.os) is requested by usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(__uClibc_main.os) (__pthread_initialize_minimal) usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(unwind.os) is requested by usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(init.os) (__GI___pthread_unwind) usr/lib/gcc/xtensa-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-xtensa.o) is requested by usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(unwind.os) (_Unwind_GetCFA) usr/lib/gcc/xtensa-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-fde-dip.o) is requested by usr/lib/gcc/xtensa-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-xtensa.o) (_Unwind_Find_FDE) the following line only appears if extra -lc is given to the linker (so that its parameters become -o autossh crt1.o crti.o crtbegin.o autossh.o -lnsl -lgcc -lc -lgcc crtend.o crtn.o): usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(dl-iterate-phdr.os) is requested by usr/lib/gcc/xtensa-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-fde-dip.o) (dl_iterate_phdr) Prior to uclibc-1.0.18 release it used to work because a call to __pthread_initialize_minimal was being resolved to function defined in libpthread/nptl/sysdeps/generic/libc-tls.c which does not reference pthread_unwind. Any idea how to fix this? -- Thanks. -- Max
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/96807eda8a4b5a25225a82d7dd2b352b84fc3... xtensa | berkeleydb-5.3.28 | http://autobuild.buildroot.net/results/886aecbbd664d11383c11c6cd9434a52f9c82... xtensa | dvblast-3.0 | http://autobuild.buildroot.net/results/29ad877562d27896e3d68c06b8c1e3970750b...
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
participants (2)
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Max Filippov -
Waldemar Brodkorb