[uclibc-ng-devel] 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.: 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