Disable the install of libomp in sub arch Following 1977404d20ab29ff78a58d8c0f1f4c5e7aef6b16

debian/patches/disable-openmp-per-target.diff

@@ -0,0 +1,23 @@
+Index: llvm-toolchain-snapshot_19~++20240229092005+22f5e30c1798/openmp/CMakeLists.txt
+===================================================================
+--- llvm-toolchain-snapshot_19~++20240229092005+22f5e30c1798.orig/openmp/CMakeLists.txt
++++ llvm-toolchain-snapshot_19~++20240229092005+22f5e30c1798/openmp/CMakeLists.txt
+@@ -48,13 +48,13 @@ else()
+   set(OPENMP_ENABLE_WERROR ${LLVM_ENABLE_WERROR})
+ 
+   # When building in tree we install the runtime according to the LLVM settings.
+-  if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+-    set(OPENMP_INSTALL_LIBDIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE STRING
+-        "Path where built openmp libraries should be installed.")
+-  else()
++#  if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
++#    set(OPENMP_INSTALL_LIBDIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE STRING
++#        "Path where built openmp libraries should be installed.")
++#  else()
+     set(OPENMP_INSTALL_LIBDIR "lib${LLVM_LIBDIR_SUFFIX}" CACHE STRING
+         "Path where built OpenMP libraries should be installed.")
+-  endif()
++#  endif()
+ 
+   if (NOT MSVC)
+     set(OPENMP_TEST_C_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang)

debian/patches/series

@@ -148,3 +148,4 @@ libclang-major-version-only.diff
 D148945-revert.diff
 arm32-defaults.diff
 mips/D154390-pre-R6.diff
+disable-openmp-per-target.diff