Bug#1118642: flang doesn't work on arm64

[Matthias Klose]

Package: src:llvm-toolchain-21
Version: 1:21.1.4-2
Severity: serious
Tags: sid forky

the autopkg test for flang fails on arm64, but flang is configured for 
this architecture. Missing runtime library could point at a packaging issue:

395s not ok 76 Test flang Fortran compilation
395s # (in test file debian/debian-llvm-testsuite.bats, line 1602)
395s #   `assert_success' failed
395s #
395s # -- command failed --
395s # status : 1
395s # output (2 lines):
395s #   /usr/bin/ld: cannot find -lflang_rt.runtime: No such file or 
directory
395s #   flang-21: error: linker command failed with exit code 1 (use -v 
to see invocation)
395s # --
395s #
396s not ok 77 Test flang shared library functionality
396s # (in test file debian/debian-llvm-testsuite.bats, line 1624)
396s #   `assert_success' failed
396s #
396s # -- command failed --
396s # status : 1
396s # output (2 lines):
396s #   /usr/bin/ld: cannot find -lflang_rt.runtime: No such file or 
directory
396s #   flang-21: error: linker command failed with exit code 1 (use -v 
to see invocation)
396s # --
396s #