Subscribing doko, as I'm not sure if there's a subtle glibc bug here
(with the ordering of libraries in the libc.so linker script).
I can only reproduce this on trusty's toolchain in any case, so not
particularly important. And only on x86 (the compiler doesn't appear to
emit calls to stack_chk_fail_local on x86-64).
** Also affects: thunderbird (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: thunderbird (Ubuntu)
Status: New => Invalid
** Changed in: thunderbird (Ubuntu Trusty)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1690445
Title:
Link failure in trusty/i386
Status in thunderbird package in Ubuntu:
Invalid
Status in thunderbird source package in Trusty:
Fix Committed
Bug description:
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/exter
nal/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/libpl
ds4.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")
/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).
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