Bug#996802: llvm-toolchain-12: FTBFS on s390x since 1:12.0.1-10: Cannot find builtins library for the target architecture

[Simon McVittie]

Control: retitle -1 llvm-toolchain-12: FTBFS on s390x since 1:12.0.1-10 and armhf since 1:12.0.1-11: Cannot find builtins library for the target architecture

On Mon, 18 Oct 2021 at 22:43:35 +0100, Simon McVittie wrote:
> The restructuring in 1:12.0.1-10 seems to have caused a regression on s390x:
> 
> https://buildd.debian.org/status/fetch.php?pkg=llvm-toolchain-12&arch=s390x&ver=1%3A12.0.1-10&stamp=1634250418&raw=0
> > -- Compiler-RT supported architectures: s390x
> > CMake Error at /<<PKGBUILDDIR>>/compiler-rt/cmake/Modules/AddCompilerRT.cmake:243 (message):
> >   Cannot find builtins library for the target architecture
> > Call Stack (most recent call first):
> >   /<<PKGBUILDDIR>>/compiler-rt/lib/stats/CMakeLists.txt:23 (add_compiler_rt_runtime)

1:12.0.1-11 has a similar issue on armhf, presumably exposed by fixing
#996828.

    smcv