The ANGLE project has an "auto-roller" that pulls SPIRV-Tools changes into our repository. A recent change fails to link spirv-reduce.

A link to the auto-roller change: https://chromium-review.googlesource.com/c/angle/angle/+/2406136

A link to one of the build log files: https://logs.chromium.org/logs/angle/buildbucket/cr-buildbucket.appspot.com/8869445363892104208/+/steps/compile_with_ninja/0/stdout?format=raw

Part of the logfile:

[150/197] LINK ./spirv-reduce
FAILED: spirv-reduce
python "../../build/toolchain/gcc_link_wrapper.py" --output="./spirv-reduce" --dwp="dwp" -- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -Wl,--fatal-warnings -Wl,--build-id -fPIC -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,-z,defs -Wl,--as-needed -Wl,-z,dead-reloc-in-nonalloc=*=0 -Wl,-z,dead-reloc-in-nonalloc=.debug_ranges=1 -fuse-ld=lld -Wl,--icf=all -Wl,--color-diagnostics -Wl,--no-call-graph-profile-sort -m64 -Werror -Wl,-O2 -Wl,--gc-sections -rdynamic --sysroot=../../build/linux/debian_sid_amd64-sysroot -L../../build/linux/debian_sid_amd64-sysroot/usr/local/lib/x86_64-linux-gnu -L../../build/linux/debian_sid_amd64-sysroot/lib/x86_64-linux-gnu -L../../build/linux/debian_sid_amd64-sysroot/usr/lib/x86_64-linux-gnu -pie -Wl,--disable-new-dtags -o "./spirv-reduce" -Wl,--start-group @"./spirv-reduce.rsp" -Wl,--end-group -latomic -ldl -lpthread -lrt
ld.lld: error: undefined symbol: spvtools::reduce::ReductionOpportunityFinder::GetTargetFunctions(spvtools::opt::IRContext*, unsigned int)

referenced by merge_blocks_reduction_opportunity_finder.cpp
spvtools_reduce/merge_blocks_reduction_opportunity_finder.o:(spvtools::reduce::MergeBlocksReductionOpportunityFinder::GetAvailableOpportunities(spvtools::opt::IRContext*, unsigned int) const) in archive obj/third_party/spirv-tools/src/libspvtools_reduce.a
referenced by operand_to_const_reduction_opportunity_finder.cpp
spvtools_reduce/operand_to_const_reduction_opportunity_finder.o:(spvtools::reduce::OperandToConstReductionOpportunityFinder::GetAvailableOpportunities(spvtools::opt::IRContext*, unsigned int) const) in archive obj/third_party/spirv-tools/src/libspvtools_reduce.a
referenced by operand_to_undef_reduction_opportunity_finder.cpp
spvtools_reduce/operand_to_undef_reduction_opportunity_finder.o:(spvtools::reduce::OperandToUndefReductionOpportunityFinder::GetAvailableOpportunities(spvtools::opt::IRContext*, unsigned int) const) in archive obj/third_party/spirv-tools/src/libspvtools_reduce.a
referenced 8 more times
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Based on the changes that are referenced, I contacted the author of the suspected change that breaks our build.