[cpt.py] Tests are failing with "ld: library not found for -lSystem"

[oshadura]

Trying to build and test cling on MacOS 11.1 with cpt.py: ./tools/packaging/cpt.py --check-requirements && ./tools/packaging/cpt.py --create-dev-env Debug --with-workdir=./builds, I am getting 6 test failures:

Failing Tests (6):
    Cling :: CodeGeneration/Symbols.C
    Cling :: Interfaces/address.C
    Cling :: LibraryCall/call.C
    Cling :: LibraryCall/callable_lib.C
    Cling :: Pragmas/add_env_path.C
    Cling :: Pragmas/load.C

  Expected Passes    : 122
  Expected Failures  : 13
  Unsupported Tests  : 12
  Unexpected Failures: 6

One of failures:

********************
FAIL: Cling :: Pragmas/load.C (104 of 153)
******************** TEST 'Cling :: Pragmas/load.C' FAILED ********************
Script:
--
: 'RUN: at line 9';   clang -shared -DCLING_EXPORT= /Users/oshadura/CERN_sources/cling/builds/cling-src/tools/cling/test/Pragmas/call_lib.c -o/Users/oshadura/CERN_sources/cling/builds/builddir/tools/cling/test/Pragmas/Output/libcall_lib.dylib
: 'RUN: at line 10';   cat /Users/oshadura/CERN_sources/cling/builds/cling-src/tools/cling/test/Pragmas/load.C | /Users/oshadura/CERN_sources/cling/builds/builddir/bin/cling --nologo -I/Users/oshadura/CERN_sources/cling/builds/builddir/tools/clang/include -L /Users/oshadura/CERN_sources/cling/builds/builddir/tools/cling/test/Pragmas/Output -Xclang -verify 2>&1 | /Users/oshadura/CERN_sources/cling/builds/builddir/bin/FileCheck /Users/oshadura/CERN_sources/cling/builds/cling-src/tools/cling/test/Pragmas/load.C
--
Exit Code: 1

Command Output (stderr):
--
ld: library not found for -lSystem
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)

[reikdas]

Just an addition - perhaps this is the motivation needed to add the macOS 11.0 runner to Cling's GitHub Actions CI.