the build system recognises armhf as armv7 (which it usually is..)
but for us that is wrong. it compiles anyway since clang is a cross compiler.
diff --git a/compiler-rt/cmake/base-config-ix.cmake b/compiler-rt/cmake/base-config-ix.cmake
index 0ad95d57f..795ca5deb 100644
--- a/compiler-rt/cmake/base-config-ix.cmake
+++ b/compiler-rt/cmake/base-config-ix.cmake
@@ -236,10 +236,7 @@ macro(test_targets)
       if(WIN32)
         test_target_arch(arm "" "" "")
       else()
-        test_target_arch(armv4t "" "-march=armv4t" "-mfloat-abi=soft")
-        test_target_arch(armv6m "" "-march=armv6m" "-mfloat-abi=soft")
-        test_target_arch(arm "" "-march=armv7-a" "-mfloat-abi=soft")
-        test_target_arch(armhf "" "-march=armv7-a" "-mfloat-abi=hard")
+        test_target_arch(armhf "" "-march=armv6zk" "-mfloat-abi=hard")
       endif()
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "avr")
       test_target_arch(avr "__AVR__" "--target=avr")