[Bug 1690445] Re: Link failure in trusty/i386

Fri May 12 19:54:40 UTC 2017

** Description changed:

  Thunderbird fails to link on trusty/i386 with the following error:
- /<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/_virtualenv/bin/python /<<BUILDDIR>>/thunderbird-52.1.0+build2/mozilla/config/expandlibs_exec.py --uselist --  /usr/bin/g++ -std=gnu++11  -Wall -Wc++11-compat -Wempty-body -Wignored-qualifiers -Woverloaded-virtual -Wpointer-arith -Wsign-compare -Wtype-limits -Wunreachable-code -Wwrite-strings -Wno-invalid-offsetof -Wno-error=maybe-uninitialized -Wno-error=deprecated-declarations -Wno-error=array-bounds -fno-exceptions -fno-strict-aliasing -fno-rtti -ffunction-sections -fdata-sections -fno-exceptions -fno-math-errno -pthread -pipe  -g -freorder-blocks -Os -fomit-frame-pointer -fPIC -shared -Wl,-z,defs -Wl,--gc-sections -Wl,-h,libprldap60.so -o libprldap60.so  ldappr-dns.o ldappr-error.o ldappr-io.o ldappr-public.o ldappr-threads.o   -lpthread  -Wl,-z,noexecstack -Wl,-z,text -Wl,--build-id    -Wl,-rpath-link,/<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/dist/bin -Wl,-rpath-link,/usr/lib   ../../../../config/external/nspr/libnspr.a  ../../../../ldap/c-sdk/libraries/libldap/libldap60.so ../../../../config/external/nspr/pr/libnspr4.so ../../../../config/external/nspr/libc/libplc4.so ../../../../config/external/nspr/ds/libplds4.so    -ldl  
+ /<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/_virtualenv/bin/python /<<BUILDDIR>>/thunderbird-52.1.0+build2/mozilla/config/expandlibs_exec.py --uselist --  /usr/bin/g++ -std=gnu++11  -Wall -Wc++11-compat -Wempty-body -Wignored-qualifiers -Woverloaded-virtual -Wpointer-arith -Wsign-compare -Wtype-limits -Wunreachable-code -Wwrite-strings -Wno-invalid-offsetof -Wno-error=maybe-uninitialized -Wno-error=deprecated-declarations -Wno-error=array-bounds -fno-exceptions -fno-strict-aliasing -fno-rtti -ffunction-sections -fdata-sections -fno-exceptions -fno-math-errno -pthread -pipe  -g -freorder-blocks -Os -fomit-frame-pointer -fPIC -shared -Wl,-z,defs -Wl,--gc-sections -Wl,-h,libprldap60.so -o libprldap60.so  ldappr-dns.o ldappr-error.o ldappr-io.o ldappr-public.o ldappr-threads.o   -lpthread  -Wl,-z,noexecstack -Wl,-z,text -Wl,--build-id    -Wl,-rpath-link,/<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/dist/bin -Wl,-rpath-link,/usr/lib   ../../../../config/external/nspr/libnspr.a  ../../../../ldap/c-sdk/libraries/libldap/libldap60.so ../../../../config/external/nspr/pr/libnspr4.so ../../../../config/external/nspr/libc/libplc4.so ../../../../config/external/nspr/ds/libplds4.so    -ldl
  Executing: /usr/bin/g++ -std=gnu++11 -Wall -Wc++11-compat -Wempty-body -Wignored-qualifiers -Woverloaded-virtual -Wpointer-arith -Wsign-compare -Wtype-limits -Wunreachable-code -Wwrite-strings -Wno-invalid-offsetof -Wno-error=maybe-uninitialized -Wno-error=deprecated-declarations -Wno-error=array-bounds -fno-exceptions -fno-strict-aliasing -fno-rtti -ffunction-sections -fdata-sections -fno-exceptions -fno-math-errno -pthread -pipe -g -freorder-blocks -Os -fomit-frame-pointer -fPIC -shared -Wl,-z,defs -Wl,--gc-sections -Wl,-h,libprldap60.so -o libprldap60.so /<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/ldap/c-sdk/libraries/libprldap/tmpPoM9m_.list -lpthread -Wl,-z,noexecstack -Wl,-z,text -Wl,--build-id -Wl,-rpath-link,/<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/dist/bin -Wl,-rpath-link,/usr/lib ../libldap/libldap60.so ../../../../config/external/nspr/pr/libnspr4.so ../../../../config/external/nspr/libc/libplc4.so ../../../../config/external/nspr/ds/libplds4.so -ldl
  /<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/ldap/c-sdk/libraries/libprldap/tmpPoM9m_.list:
-     INPUT("ldappr-dns.o")
-     INPUT("ldappr-error.o")
-     INPUT("ldappr-io.o")
-     INPUT("ldappr-public.o")
-     INPUT("ldappr-threads.o")
+     INPUT("ldappr-dns.o")
+     INPUT("ldappr-error.o")
+     INPUT("ldappr-io.o")
+     INPUT("ldappr-public.o")
+     INPUT("ldappr-threads.o")

  /usr/lib/i386-linux-gnu/libc_nonshared.a(stack_chk_fail_local.oS): In function `__stack_chk_fail_local':
  (.text+0x10): undefined reference to `__stack_chk_fail'
  collect2: error: ld returned 1 exit status
  make[5]: *** [libprldap60.so] Error 1
  make[5]: Leaving directory `/<<BUILDDIR>>/thunderbird-52.1.0+build2/obj-i686-linux-gnu/ldap/c-sdk/libraries/libprldap'
  make[4]: *** [ldap/c-sdk/libraries/libprldap/target] Error 2
  make[4]: *** Waiting for unfinished jobs....

  I've worked around this in the past by exporting "LIBS=-lc", but without
  really understanding what the issue is. So I've taken a proper look at
  this issue now.

  Firstly, "-lc" is passed to the linker without the previous workaround.
  This can be observed by adding --verbose to the link command:

  COLLECT_GCC_OPTIONS='-std=gnu++11' '-Wall' '-Wc++0x-compat' '-Wempty-
  body' '-Wignored-qualifiers' '-Woverloaded-virtual' '-Wpointer-arith'
  '-Wsign-compare' '-Wtype-limits' '-Wwrite-strings' '-Wno-invalid-
  offsetof' '-Wno-error=maybe-uninitialized' '-Wno-error=deprecated-
  declarations' '-Wno-error=array-bounds' '-fno-strict-aliasing' '-fno-
  rtti' '-ffunction-sections' '-fdata-sections' '-fno-exceptions' '-fno-
  math-errno' '-pthread' '-pipe' '-g' '-freorder-blocks' '-Os' '-fomit-
  frame-pointer' '-fPIC' '-shared' '-o' 'libprldap60.so' '-v' '-shared-
  libgcc' '-mtune=generic' '-march=i686' /usr/lib/gcc/i686-linux-
  gnu/4.8/collect2 --sysroot=/ --build-id --eh-frame-hdr -m elf_i386
  --hash-style=gnu --as-needed -shared -z relro -o libprldap60.so
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/crti.o
  /usr/lib/gcc/i686-linux-gnu/4.8/crtbeginS.o -L/usr/lib/gcc/i686-linux-
  gnu/4.8 -L/usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu
  -L/usr/lib/gcc/i686-linux-gnu/4.8/../../../../lib -L/lib/i386-linux-gnu
  -L/lib/../lib -L/usr/lib/i386-linux-gnu -L/usr/lib/../lib
  -L/usr/lib/gcc/i686-linux-gnu/4.8/../../.. -z defs --gc-sections -h
  libprldap60.so /build/thunderbird-52.1.1+build1/obj-i686-linux-
  gnu/ldap/c-sdk/libraries/libprldap/tmpPrXe8H.list -lpthread -z
  noexecstack -z text --build-id -rpath-link
  /build/thunderbird-52.1.1+build1/obj-i686-linux-gnu/dist/bin -rpath-link
  /usr/lib ../libldap/libldap60.so
  ../../../../config/external/nspr/pr/libnspr4.so
  ../../../../config/external/nspr/libc/libplc4.so
  ../../../../config/external/nspr/ds/libplds4.so -ldl -lstdc++ -lm
  -lgcc_s -lpthread -lc -lgcc_s /usr/lib/gcc/i686-linux-gnu/4.8/crtendS.o
  /usr/lib/gcc/i686-linux-gnu/4.8/../../../i386-linux-gnu/crtn.o

  The workaround results in "-lc" being passed twice.

  Passing "-Wl,--verbose" to the link command shows that ld loads libc.so
  from /usr/lib/i386-linux-gnu/libc.so. This is actually a linker script
  containing the following line:

  GROUP ( /lib/i386-linux-gnu/libc.so.6 /usr/lib/i386-linux-
  gnu/libc_nonshared.a  AS_NEEDED ( /lib/i386-linux-gnu/ld-linux.so.2 ) )

  So the linker first loads the real libc.so.6. However, none of the
  object files that we are linking use any symbols exported from libc.
  Because our default configuration is to link with --as-needed, this
  means that libc.so is dropped now and is not used for further symbol
  resolution. Then we load libc_nonshared.a, from which we require
  stack_chk_fail_local.oS. This contains a call to stack_chk_fail, which
  is exported from libc. The link now fails because it can't resolve the
  call to stack_chk_fail.

  It seems like libc_nonshared.a should come before libc.so.6.

  I can reproduce this with the attached C++ file (build commands are
- included at the top).
+ included at the top). If I remove -Wl,-z,defs from the test case, I get
+ a .so without any DT_NEEDED entries

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https://bugs.launchpad.net/bugs/1690445

Title:
  Link failure in trusty/i386

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