Bump LDC-LLVM to v21.1.2

[kinke]

No description provided.

[calvin2021y]

Any updates on this #4943? We'd love to get it merged with llvm21 if possible!

[kinke]

Any help in #4943 would be appreciated, in case you e.g. have the ability to test it locally - it would e.g. be good to know whether the test failures are legit, or specific to the GHA runner container environment. Troubleshooting via CI is a huge PITA and incredibly time-consuming with the poor feedback times.

[calvin2021y]

I am not sure how to test it local, I try to build get this error on x86:

Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %5) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %6) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %6) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %5) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %5) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %6) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %6) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %5) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %7) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %7) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %10) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.start.p0(ptr immarg %11) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %11) #2
Incorrect number of arguments passed to called function!
  call void @llvm.lifetime.end.p0(ptr immarg %10) #2
LLVM ERROR: Broken module found, compilation aborted!
Aborted (core dumped)
ninja: subcommands failed

will update aarch64 late.

[thewilsonator]

I am not sure how to test it local, I try to build get this error on x86:
...
will update aarch64 late.

See ffed803
note that phobos will still fail to build as with #4979

[kinke]

@calvin2021y: I meant testing on Alpine AArch64, using a supported LLVM version < 21.

[kinke]

Oof, pretty discouraging first test results for CI.

[calvin2021y]

@calvin2021y: I meant testing on Alpine AArch64, using a supported LLVM version < 21.

Thanks for the tips. I try build the tests on aarch64. find a problem:

use '-DCMAKE_EXE_LINKER_FLAGS="-static-libstdc++ -fuse-ld=lld"` will blocked by:

ldmd2 -linkonce-templates -O -defaultlib=phobos2-ldc,druntime-ldc -wi -O -inline -release -of/opt/projects/ldc/bin/timetrace2txt /opt/projects/ldc/obj/timetrace2txt.o -gcc=/usr/lib/llvm20/bin/clang++ "-Xcc=-static-libstdc++ -fuse-ld=lld" -Xcc=-static -Xcc=-fuse-ld=lld

clang++: error: unknown argument: '-static-libstdc++ -fuse-ld=lld'

'-static-libstdc++ -fuse-ld=lld' should be 2 arguments here.

[the-horo]

@calvin2021y: I meant testing on Alpine AArch64, using a supported LLVM version < 21.

Thanks for the tips. I try build the tests on aarch64. find a problem:

use '-DCMAKE_EXE_LINKER_FLAGS="-static-libstdc++ -fuse-ld=lld"` will blocked by:

ldmd2 -linkonce-templates -O -defaultlib=phobos2-ldc,druntime-ldc -wi -O -inline -release -of/opt/projects/ldc/bin/timetrace2txt /opt/projects/ldc/obj/timetrace2txt.o -gcc=/usr/lib/llvm20/bin/clang++ "-Xcc=-static-libstdc++ -fuse-ld=lld" -Xcc=-static -Xcc=-fuse-ld=lld

clang++: error: unknown argument: '-static-libstdc++ -fuse-ld=lld'

'-static-libstdc++ -fuse-ld=lld' should be 2 arguments here.

Use -DCMAKE_EXE_LINKER_FLAGS="-static-libstdc++;-fuse-ld=lld". Separate the arguments by ;, not by .