Bug#1118647: LLVM 21 ftbfs on sparc64 with lld, ld.lld: error: unknown argument '-relax'

Package: src:llvm-toolchain-21
Version: 1:21.1.4-2
Severity: important
Tags: sid forky
X-Debbugs-CC: [email protected]

ld.lld: error: unknown argument '-relax':

         Run Build Command(s): /usr/bin/ninja -v cmTC_d3b28
         [1/2] /usr/bin/g++ -DCXX_SUPPORTS_CUSTOM_LINKER -D_GNU_SOURCE 
-fstack-protector-strong -Wformat -Werror=format-security 
-Wno-unused-command-line-argument -Wdate-time -D_FORTIFY_SOURCE=2  -O3 
-DNDEBUG -std=c++17 -o CMakeFiles/cmTC_d3b28.dir/src.cxx.o -c 
/build/reproducible-path/llvm-toolchain-21-21.1.4/build-llvm/CMakeFiles/CMakeScratch/TryCompile-vJboAh/src.cxx
         [2/2] : && /usr/bin/g++ -fstack-protector-strong -Wformat 
-Werror=format-security -Wno-unused-command-line-argument -Wdate-time 
-D_FORTIFY_SOURCE=2  -O3 -DNDEBUG -Wl,-z,relro -Wl,--build-id 
-fuse-ld=lld CMakeFiles/cmTC_d3b28.dir/src.cxx.o -o cmTC_d3b28  -lm && :
         FAILED: cmTC_d3b28
         : && /usr/bin/g++ -fstack-protector-strong -Wformat 
-Werror=format-security -Wno-unused-command-line-argument -Wdate-time 
-D_FORTIFY_SOURCE=2  -O3 -DNDEBUG -Wl,-z,relro -Wl,--build-id 
-fuse-ld=lld CMakeFiles/cmTC_d3b28.dir/src.cxx.o -o cmTC_d3b28  -lm && :
         ld.lld: error: unknown argument '-relax', did you mean '--relax'
         collect2: error: ld returned 1 exit status
         ninja: build stopped: subcommand failed.


it looks like it is building with the BFD linker, but it still builds 
lld on sparc64, so maybe that linker doesn't work at all on sparc64.