Bug#968807: llvm-toolchain-11: FTBS on Bulleye

[Christophe CT. TROPHIME]

Package: llvm-toolchain-11
Version: 11.0.0~+rc1-2
Severity: important

Dear Maintainer,

Hi,
Trying to build the package on Debian testing with pbuilder I run into an error
at link time:

[ 57%] Linking C shared library ../../../../lib/libomp.so.5
cd "/build/llvm-toolchain-11-11.0.0~+rc1/build-
llvm/projects/openmp/runtime/src" && /usr/bin/cmake -E cmake_link_script
CMakeFiles/omp.dir/link.txt --verbose=1
/usr/bin/gcc-10 -fPIC -g -O2 -fdebug-prefix-map=/build/llvm-
toolchain-11-11.0.0~+rc1=. -fstack-protector-strong -Wformat -Werror=format-
security -fPIC -Werror=date-time -Wall -Wextra
-Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -pedantic
-Wno-long-long -Wimplicit-fallthrough -Wno-comment -ffunction-sections -fdata-
sections -Wall -Wcast-qua
l -Wimplicit-fallthrough -Wsign-compare -Wno-extra -Wno-pedantic -Wno-maybe-
uninitialized -O2 -g -DNDEBUG -Wl,--warn-shared-textrel -Wl,--as-needed -Wl,--
version-script=/build/llvm-to
olchain-11-11.0.0~+rc1/openmp/runtime/src/exports_so.txt -static-libgcc
-Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,defs -Wl,-z,nodelete -shared
-Wl,-soname,libomp.so.5 -o ../../../../lib/
libomp.so.5 CMakeFiles/omp.dir/kmp_alloc.cpp.o
CMakeFiles/omp.dir/kmp_atomic.cpp.o CMakeFiles/omp.dir/kmp_csupport.cpp.o
CMakeFiles/omp.dir/kmp_debug.cpp.o CMakeFiles/omp.dir/kmp_itt.
cpp.o CMakeFiles/omp.dir/kmp_environment.cpp.o
CMakeFiles/omp.dir/kmp_error.cpp.o CMakeFiles/omp.dir/kmp_global.cpp.o
CMakeFiles/omp.dir/kmp_i18n.cpp.o CMakeFiles/omp.dir/kmp_io.cpp.o
 CMakeFiles/omp.dir/kmp_runtime.cpp.o CMakeFiles/omp.dir/kmp_settings.cpp.o
CMakeFiles/omp.dir/kmp_str.cpp.o CMakeFiles/omp.dir/kmp_tasking.cpp.o
CMakeFiles/omp.dir/kmp_threadprivate.
cpp.o CMakeFiles/omp.dir/kmp_utility.cpp.o CMakeFiles/omp.dir/kmp_barrier.cpp.o
CMakeFiles/omp.dir/kmp_wait_release.cpp.o CMakeFiles/omp.dir/kmp_affinity.cpp.o
CMakeFiles/omp.dir/kmp_
dispatch.cpp.o CMakeFiles/omp.dir/kmp_lock.cpp.o
CMakeFiles/omp.dir/kmp_sched.cpp.o CMakeFiles/omp.dir/z_Linux_util.cpp.o
CMakeFiles/omp.dir/kmp_gsupport.cpp.o CMakeFiles/omp.dir/thir
dparty/ittnotify/ittnotify_static.cpp.o CMakeFiles/omp.dir/kmp_taskdeps.cpp.o
CMakeFiles/omp.dir/kmp_cancel.cpp.o CMakeFiles/omp.dir/kmp_ftn_cdecl.cpp.o
CMakeFiles/omp.dir/kmp_ftn_ext
ra.cpp.o CMakeFiles/omp.dir/kmp_version.cpp.o CMakeFiles/omp.dir/ompt-
general.cpp.o CMakeFiles/omp.dir/z_Linux_asm.S.o  -lpthread -ldl -Wl,--version-
script=/build/llvm-toolchain-11-11
.0.0~+rc1/openmp/runtime/src/exports_so.txt
/usr/bin/ld: duplicate version tag `VERSION'
/usr/bin/ld: duplicate version tag `OMP_1.0'
/usr/bin/ld: duplicate version tag `OMP_2.0'
/usr/bin/ld: duplicate version tag `OMP_3.0'
/usr/bin/ld: duplicate version tag `OMP_3.1'
/usr/bin/ld: duplicate version tag `OMP_4.0'
/usr/bin/ld: duplicate version tag `OMP_4.5'
/usr/bin/ld: duplicate version tag `GOMP_1.0'
/usr/bin/ld: duplicate version tag `GOMP_2.0'
/usr/bin/ld: duplicate version tag `GOMP_3.0'
/usr/bin/ld: duplicate version tag `GOMP_4.0'
/usr/bin/ld: duplicate version tag `GOMP_4.5'
/usr/bin/ld: duplicate version tag `GOMP_5.0'
collect2: error: ld returned 1 exit status
make[2]: *** [projects/openmp/runtime/src/CMakeFiles/omp.dir/build.make:552:
lib/libomp.so.5] Error 1
make[2]: Target 'projects/openmp/runtime/src/CMakeFiles/omp.dir/build' not
remade because of errors.
make[2]: Leaving directory '/build/llvm-toolchain-11-11.0.0~+rc1/build-llvm'

No idea how to fix this.
Best
C.



-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.7.0-2-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled