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...has worked. However, on the Release+Asserts version, the third line results in a segmentation fault. The backtrace for the error, up to the method I'm working on, is as follows: // signal handling... #4 0x00005556e48d6120 llvm::ReplaceableMetadataImpl::getOrCreate(llvm::Metadata&) (/home/sjessu/build-no-debug/bin/clang-10+0x2787120) #5 0x00005556e48db8c2 llvm::MetadataTracking::track(void*, llvm::Metadata&, llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>) (/home/sjessu/build-no-debug/bin/clang-10+0x278c8c2) #6 0x00005556e48dbc12 llvm::MDNode::MDNode(llvm::LLVMConte...

...the third line results in a segmentation fault. The backtrace for >> the error, up to the method I'm working on, is as follows: >> >> // signal handling... >> #4 0x00005556e48d6120 >> llvm::ReplaceableMetadataImpl::getOrCreate(llvm::Metadata&) >> (/home/sjessu/build-no-debug/bin/clang-10+0x2787120) >> #5 0x00005556e48db8c2 llvm::MetadataTracking::track(void*, >> llvm::Metadata&, llvm::PointerUnion<llvm::MetadataAsValue*, >> llvm::Metadata*>) (/home/sjessu/build-no-debug/bin/clang-10+0x278c8c2) >> #6 0x00005556e48dbc12...

Adding a couple of lld folks. I helped Shishir debug this, the link line looked like: /home/sjessu/build/bin/clang -O0 -flto -o jcstest jcstest.o ./.libs/libjpeg.a and the issue was that libjpeg.a was created with the system ar instead of llvm-ar. It worked when recreating libjpeg.a with llvm-ar. I noticed that the lld code has some special handling for the case when there is a missing symbol...

Hi, I have tried to build libjpeg-turbo <https://github.com/libjpeg-turbo/libjpeg-turbo> with LTO in LLVM, using both clangbut get many errors in lld that look like the following: ld: error: undefined symbol: jpeg_std_error >>> referenced by jcstest.c:76 >>> lto.tmp:(main) ld: error: undefined symbol: jpeg_CreateCompress >>> referenced by