diff --git a/CMake/PickyWarnings.cmake b/CMake/PickyWarnings.cmake
index de5ae84fc7..7e70d75a0f 100644
--- a/CMake/PickyWarnings.cmake
+++ b/CMake/PickyWarnings.cmake
@@ -138,7 +138,7 @@ if(PICKY_COMPILER)
          (CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 6.3))
         list(APPEND _picky_enable
           ${_picky_common}
-          -Wunreachable-code-break         # clang  3.5            appleclang  6.0
+        # -Wunreachable-code-break         # clang  3.5            appleclang  6.0  # Not used: Silent in "unity" builds
           -Wheader-guard                   # clang  3.4            appleclang  5.1
           -Wsometimes-uninitialized        # clang  3.2            appleclang  4.6
         )
diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index c70cbf2fd7..79242faca7 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -879,7 +879,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
           dnl Only clang 3.5 or later
           if test "$compiler_num" -ge "305"; then
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [pragmas])
-            CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unreachable-code-break])
+          # CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [unreachable-code-break])  # Not used: Silent in "unity" builds
           fi
           #
           dnl Only clang 3.6 or later