FYI: Unable to build -r501994 ports' devel/llvm60 on clang 8 based powerpc64 system: "BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935"

[Mark Millard]

[I finally provide a small source file and steps for
processing it to produce the BFD_ASSERT notices.]

On 2019-May-19, at 11:06, Dimitry Andric <dim at FreeBSD.org> wrote:

> On 19 May 2019, at 16:56, Mark Millard via freebsd-toolchain <freebsd-toolchain at freebsd.org> wrote:
>> This was in a poudriere bulk build on a head -r347549 based powerpc64
>> system with system clang 8 for cc and c++ and base/binutils
>> for the likes of ld. (The system has the llvm libunwind patches
>> for powerpc64 so throwing c++ exceptions work.)
>> 
>> [4397/4552] : && /usr/bin/c++ -fPIC -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fcolor-diagnostics -ffunction-sections -fdata-sections -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include  -fstack-protector-strong   -Wl,-z,origin  -Wl,-O3 -Wl,--gc-sections  -Wl,--version-script,/wrkdirs/usr/ports/devel/llvm60/work/.build/tools/lto/LTO.exports -shared -Wl,-soname,libLTO.so.6 -o lib/libLTO.so.6.0.1 tools/lto/CMakeFiles/LTO.dir/LTODisassembler.cpp.o tools/lto/CMakeFiles/LTO.dir/lto.cpp.o -L/usr/local/lib -Wl,-rpath,"\$ORIGIN/../
>> lib:/usr/local/lib" lib/libLLVM-6.0.so && :
>> FAILED: lib/libLTO.so.6.0.1
>> : && /usr/bin/c++ -fPIC -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fcolor-diagnostics -ffunction-sections -fdata-sections -O2 -pipe -DNDEBUG -fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  -DNDEBUG -isystem /usr/local/include  -fstack-protector-strong   -Wl,-z,origin  -Wl,-O3 -Wl,--gc-sections  -Wl,--version-script,/wrkdirs/usr/ports/devel/llvm60/work/.build/tools/lto/LTO.exports -shared -Wl,-soname,libLTO.so.6 -o lib/libLTO.so.6.0.1 tools/lto/CMakeFiles/LTO.dir/LTODisassembler.cpp.o tools/lto/CMakeFiles/LTO.dir/lto.cpp.o -L/usr/local/lib -Wl,-rpath,"\$ORIGIN/../lib:/usr/loc
>> al/lib" lib/libLLVM-6.0.so && :
>> /usr/bin/powerpc64-unknown-freebsd13.0-ld: BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935
>> /usr/bin/powerpc64-unknown-freebsd13.0-ld: BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935
> 
> See <https://bugs.freebsd.org/237068>.  I think this is a BFD ld bug,
> but I still haven't been able to come up with a small test case.  Any
> help appreciated. :-)

NOTE: Only tested in the powerpc64 context, with system clang 8
for c++ and base/binutil for ld and such.

I used the simple_version_script.map from llvm60 in my environment.

(Also noted in bugzilla comment #13:)

The following small source code file and the few steps
to build/link it produce the message:

# more small_link_failure.cpp
unsigned long fixed_seed_override= 0xdeadc0de;

inline unsigned long get_execution_seed()
{
  const  unsigned long seed_prime = 0xff51afd7ed558ccdULL;
  static unsigned long seed = fixed_seed_override ? fixed_seed_override
                                           : (unsigned long)seed_prime;
  return seed;
}

unsigned long f()
{
  return get_execution_seed();
}

# c++ -c small_link_failure.cpp

# rm -f small_link_failure.a
# /usr/bin/ar qc small_link_failure.a small_link_failure.o

# "/usr/bin/powerpc64-unknown-freebsd13.0-ld" \
"-Bshareable" \
"-o" "small_link_failure-1.0.so" \
"/usr/lib/crtbeginS.o" \
"--version-script" "/wrkdirs/usr/ports/devel/llvm60/work/.build/./lib/tools/llvm-shlib/simple_version_script.map" \
"--whole-archive" \
"small_link_failure.a" \
"--no-whole-archive" \
"-lm"

# /usr/bin/powerpc64-unknown-freebsd13.0-ld \
"-Bshareable" \
"-o" "small_link_failure.so.1.0.1" \
"small_link_failure-1.0.so"

The resultant output is:

/usr/bin/powerpc64-unknown-freebsd13.0-ld: BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935
/usr/bin/powerpc64-unknown-freebsd13.0-ld: BFD (GNU Binutils) 2.32 assertion fail elflink.c:2935



===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)