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bitcoin: re-enable -flto=thin #14051

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Sep 24, 2025
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bitcoin: re-enable -flto=thin #14051

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12 changes: 3 additions & 9 deletions projects/bitcoin-core/build.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -28,17 +28,11 @@ else
export BUILD_TRIPLET="x86_64-pc-linux-gnu"
fi

# Build using ThinLTO, to avoid OOM, and other LLVM issues.
# See https://github.com/google/oss-fuzz/pull/10123.
# Skip CFLAGS for now, to avoid:
# "/usr/bin/ld: error: Failed to link module lib/libevent.a.llvm.17822.buffer.c: Expected at most one ThinLTO module per bitcode file".
# export CFLAGS="$CFLAGS -flto=thin"
# Skip CXXFLAGS for now, to avoid: undefined reference to __sancov_gen_.
# export CXXFLAGS="$CXXFLAGS -flto=thin"
# export LDFLAGS="-flto=thin"

export CFLAGS="$CFLAGS -flto=full"
export CXXFLAGS="$CXXFLAGS -flto=full"
# Use lld to workaround <module> referenced in <section> of /tmp/lto-llvm-*.o: defined in discarded section
export LDFLAGS="-fuse-ld=lld"
export LDFLAGS="-fuse-ld=lld -flto=full"

export CPPFLAGS="-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -DBOOST_MULTI_INDEX_ENABLE_SAFE_MODE"

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