tpoechtrager
commented
7 years ago Seems like you must use Apple's LLVM/Clang version due to lto_codegen_hide_symbols not being present in upstream LLVM/Clang.
wget https://opensource.apple.com/tarballs/clang/clang-800.0.42.1.tar.gz
tar xf clang-800.0.42.1.tar.gz
cd clang-800.0.42.1
mkdir build
cd build
cmake ../src -DCMAKE_INSTALL_PREFIX=/opt/compiler/apple-clang -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=OFF -DLLVM_INCLUDE_TESTS=OFF
make clang LTO llvm-dsymutil llvm-config -j8
[sudo] make install-clang install-clang-headers install-LTO install-llvm-dsymutil install-llvm-config
export PATH=/opt/compiler/apple-clang/bin:$PATH$ which llvm-config clang
/opt/compiler/apple-clang/bin/llvm-config
/opt/compiler/apple-clang/bin/clang
$ nm /opt/compiler/apple-clang/lib/libLTO.so |grep lto_codegen_hide_symbols
000000000027f820 T lto_codegen_hide_symbols=> Re-build cctools and ld64 (not tested).
=> Ensure ld64 uses the correct libLTO.so:
$ ldd [...]-ld | grep /opt/compiler/apple-clang/lib
muratmat
Hello,
I downloaded and compiled successfuly the last version of cctools. I'm trying to pre-link some object files (containing bitcode) into a single one:
ld -r -x -bitcode_bundle -bitcode_hide_symbols -arch armv7 -o prelinked_mylib.a
and I'm getting the following error: "ld: loaded libLTO doesn't support -bitcode_hide_symbols: LLVM version 3.9.1 for architecture armv7"
Is there a way to get support for 'bitcode_hide_symbols' features? Any idea/switch?
Many thanks in advance, Matteo.