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Hi Pirama, I can't reproduce with either lld or gold, using a compiler built from head. What version is your clang? Thanks, Teresa On Tue, May 8, 2018 at 7:50 PM Pirama Arumuga Nainar via llvm-dev < llvm-dev at lists.llvm.org> wrote: > The duplicate symbol errors are for __llvm_profile_filename and __llvm_profile_raw_version. > IIUC, these are supposed to be weak symbols but

The duplicate symbol errors are for __llvm_profile_filename and __llvm_profile_raw_version. IIUC, these are supposed to be weak symbols but Thin LTO seems to break this in some way. This does't happen with gold or no LTO or full LTO. $ cat > a.c extern int foo(); int main() { return foo(); } $ cat > b.c int foo() { return 0; } $ clang a.c -fprofile-generate -flto=thin -c $ clang

...ftware Engineer | tejohnson at google.com | > 408-460-2413 > -- Teresa Johnson | Software Engineer | tejohnson at google.com | 408-460-2413 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180509/d6c95e84/attachment-0001.html>