Re: New compilation errors building Cygwin DLL

["Mark A. Engel" <mark dot engel at comcast dot net>]

Hi, I have been trying to build the cross unix/linux compiler and using 
the following document;
   http://preshing.com/20141119/how-to-build-a-gcc-cross-compiler/
and all is good until I get to step 6 (of the document and I get this 
error.  I'm not sure where I need to go to fix this error.  I have put in

#ifndef RTLD_PRIVATE_ERRNO
#define RTLD_PRIVATE_ERRNO 1
#endif

in the sysdep.h and dl-sysdep.h header files which cleared some of the 
undefined rtld_errno but not all.  Please help and steer me in the right 
direction.

   make[2]: Entering directory '/home/MarkEngel/downloads/glibc-2.26/elf'
   make -f /home/MarkEngel/downloads/build-glibc/elf/librtld.mk -f
   rtld-Rules
   make[3]: Entering directory '/home/MarkEngel/downloads/glibc-2.26/elf'
   make subdir=dirent -C ../dirent ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-closedir.os
   rtld-readdir.os rtld-rewinddir.os rtld-getdents64.os rtld-fdopendir.os'
   make subdir=elf -C ../elf ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-dl-addr-obj.os'
   make subdir=gmon -C ../gmon ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-profil.os
   rtld-prof-freq.os'
   make subdir=io -C ../io ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-xstat.os
   rtld-fxstat.os rtld-lxstat.os rtld-open64.os rtld-read.os
   rtld-write.os rtld-lseek64.os rtld-access.os rtld-fcntl.os
   rtld-close.os'
   make[4]: Entering directory '/home/MarkEngel/downloads/glibc-2.26/elf'
   make subdir=misc -C ../misc ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-mmap64.os
   rtld-munmap.os rtld-mprotect.os'
   make subdir=nptl -C ../nptl ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-libc-lowlevellock.os
   rtld-libc-cancellation.os rtld-libc_multiple_threads.os rtld-forward.os'
   make subdir=posix -C ../posix ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-uname.os rtld-_exit.os
   rtld-getpid.os rtld-environ.os'
   make[4]: Leaving directory '/home/MarkEngel/downloads/glibc-2.26/elf'
   make subdir=setjmp -C ../setjmp ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-setjmp.os
   rtld-__longjmp.os'
   make subdir=signal -C ../signal ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-sigaction.os'
   make subdir=stdlib -C ../stdlib ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-exit.os
   rtld-cxa_atexit.os rtld-cxa_thread_atexit_impl.os'
   make subdir=string -C ../string ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-strchr.os
   rtld-strcmp.os rtld-strcspn.os rtld-strdup.os rtld-strlen.os
   rtld-strnlen.os rtld-memchr.os rtld-memcmp.os rtld-memmove.os
   rtld-memset.os rtld-mempcpy.os rtld-stpcpy.os rtld-memcpy.os
   rtld-rawmemchr.os rtld-strchrnul.os rtld-memcpy_generic.os
   rtld-memcpy_thunderx.os'
   make subdir=time -C ../time ..=../
   objdir=/home/MarkEngel/downloads/build-glibc -f Makefile -f
   ../elf/rtld-Rules rtld-all rtld-modules='rtld-setitimer.os'
   make[4]: Entering directory '/home/MarkEngel/downloads/glibc-2.26/nptl'
   make[4]: Leaving directory '/home/MarkEngel/downloads/glibc-2.26/nptl'
   make[3]: Leaving directory '/home/MarkEngel/downloads/glibc-2.26/elf'
   aarch64-linux-gcc   -nostdlib -nostartfiles -shared -o
   /home/MarkEngel/downloads/build-glibc/elf/ld.so.new \
              -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both
   -Wl,-z,defs       \
              /home/MarkEngel/downloads/build-glibc/elf/librtld.os
   -Wl,--version-script=/home/MarkEngel/downloads/build-glibc/ld.map \
   -Wl,-soname=ld-linux-aarch64.so.1                     \
              -Wl,-defsym=_begin=0
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os: In function
   `_dl_map_object_from_fd':
   /home/MarkEngel/downloads/glibc-2.26/elf/dl-load.c:890: undefined
   reference to `rtld_errno'
   /home/MarkEngel/downloads/glibc-2.26/elf/dl-load.c:890: undefined
   reference to `rtld_errno'
   /home/MarkEngel/downloads/glibc-2.26/elf/dl-load.c:890: undefined
   reference to `rtld_errno'
   /home/MarkEngel/downloads/glibc-2.26/elf/dl-load.c:890: undefined
   reference to `rtld_errno'
   /home/MarkEngel/downloads/glibc-2.26/elf/dl-load.c:890: undefined
   reference to `rtld_errno'
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os:/home/MarkEngel/downloads/glibc-2.26/elf/dl-load.c:890:
   more undefined references to `rtld_errno' follow
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os: In function
   `_dl_sysdep_start':
   /home/MarkEngel/downloads/glibc-2.26/elf/../elf/dl-sysdep.c:251:
   undefined reference to `__libc_check_standard_fds'
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os: In function
   `__brk':
   /home/MarkEngel/downloads/glibc-2.26/elf/../sysdeps/unix/sysv/linux/generic/brk.c:39:
   undefined reference to `rtld_errno'
   /home/MarkEngel/downloads/glibc-2.26/elf/../sysdeps/unix/sysv/linux/generic/brk.c:39:
   undefined reference to `rtld_errno'
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os: In function
   `__sbrk':
   /home/MarkEngel/downloads/glibc-2.26/elf/../misc/sbrk.c:54:
   undefined reference to `rtld_errno'
   /home/MarkEngel/downloads/glibc-2.26/elf/../misc/sbrk.c:54:
   undefined reference to `rtld_errno'
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os: In function
   `__getcwd':
   /home/MarkEngel/downloads/glibc-2.26/elf/../sysdeps/unix/sysv/linux/getcwd.c:129:
   undefined reference to `rtld_errno'
   /home/MarkEngel/downloads/build-glibc/elf/librtld.os:/home/MarkEngel/downloads/glibc-2.26/elf/../sysdeps/unix/sysv/linux/getcwd.c:129:
   more undefined references to `rtld_errno' follow
   /opt/cross/lib/gcc/aarch64-linux/7.2.0/../../../../aarch64-linux/bin/ld:
   /home/MarkEngel/downloads/build-glibc/elf/ld.so.new: hidden symbol
   `__libc_check_standard_fds' isn't defined
   /opt/cross/lib/gcc/aarch64-linux/7.2.0/../../../../aarch64-linux/bin/ld:
   final link failed: Bad value
   collect2: error: ld returned 1 exit status
   make[2]: *** [Makefile:464:
   /home/MarkEngel/downloads/build-glibc/elf/ld.so] Error 1
   make[2]: Leaving directory '/home/MarkEngel/downloads/glibc-2.26/elf'
   make[1]: *** [Makefile:215: elf/subdir_lib] Error 2
   make[1]: Leaving directory '/home/MarkEngel/downloads/glibc-2.26'
   make: *** [Makefile:9: all] Error 2

   Mark Engel@Mark-Development ~/downloads/build-glibc



--
Mark Engel
Software Engineer
630 960-5300
mark.engel@comcast.net