build: test_bitcoin link failure with -flto=thin & address sanitizer #33147

1. 
   fanquake commented at 3:46 pm on August 6, 2025: member

   0clang --version
   1clang version 20.1.8 (Fedora 20.1.8-3.fc43)
   2Target: aarch64-redhat-linux-gnu
   3Thread model: posix
   4InstalledDir: /usr/bin
   5Configuration file: /etc/clang/aarch64-redhat-linux-gnu-clang.cfg
   

    0export CC=clang
    1export CXX=clang++
    2# CMAKE_INTERPROCEDURAL_OPTIMIZATION is -flto=thin for clang
    3cmake -B build -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON -DSANITIZERS=address
    4<snip>
    5[ 54%] Built target bitcoin-util
    6[ 55%] Built target bitcoin-wallet
    7[ 72%] Built target bitcoin_node
    8[ 73%] Built target bitcoind
    9[ 73%] Linking CXX executable ../../bin/test_bitcoin
   10/usr/bin/ld: error: Failed to link module ../../lib/libbitcoin_consensus.a.llvm.20628.arith_uint256.cpp: Expected at most one ThinLTO module per bitcode file
   11clang++: error: linker command failed with exit code 1 (use -v to see invocation)
   

   We have seen the same issue in oss-fuzz: https://github.com/google/oss-fuzz/blob/564805ba6f3d5b3b9386ae68aaa919ffcf8b50da/projects/bitcoin-core/build.sh#L33.

2. fanquake added the label Build system on Aug 6, 2025

Contributors
fanquake

Labels
Build system