Superfluous warnings from ranlib about libcellml.a having no symbols on macOS

[agarny]

It doesn't seem to be possible (anymore?) to build a static version of libCellML. Here is what I tried and got on macOS:

cd <libCellML>
mkdir build && cd build && cmake -G Ninja -DLIBCELLML_BINDINGS_PYTHON=OFF -DLIBCELLML_BUILD_SHARED=OFF -DLIBCELLML_BUILD_TYPE=Release -DLIBCELLML_COVERAGE=OFF -DLIBCELLML_LLVM_COVERAGE=OFF -DLIBCELLML_UNIT_TESTS=OFF .. && ninja
-- The CXX compiler identification is AppleClang 11.0.0.11000033
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Python: /usr/local/Frameworks/Python.framework/Versions/3.7/bin/python3.7 (found version "3.7.6") found components: Interpreter Development
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- Found Sphinx: /usr/local/opt/sphinx-doc/bin/sphinx-build
-- Found SWIG: /usr/local/bin/swig (found suitable version "4.0.1", minimum required is "3")
-- Performing Test LLVM_COVERAGE_COMPILER_FLAGS_OK
-- Performing Test LLVM_COVERAGE_COMPILER_FLAGS_OK - Success
-- Performing Test GCC_COVERAGE_COMPILER_FLAGS_OK
-- Performing Test GCC_COVERAGE_COMPILER_FLAGS_OK - Success
-- Found LibXml2: /usr/lib/libxml2.dylib (found version "2.9.4")
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/Alan/libCellML/build
[26/26] Linking CXX static library src/libcellml.a
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: src/libcellml.a(debug.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: src/libcellml.a(debug.cpp.o) has no symbols

[agarny]

FWIW, I have tried using Make rather than Ninja, but no difference.

[hsorby]

[26/26] Linking CXX static library src/libcellml.a

Doesn't that say it has built a static library?

[agarny]

Oops, my bad, you are right. I clearly got confused by those ranlib messages. It might be good to get rid of them. Maybe something like avast/retdec#349. Am going to give it a quick try.