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Add -Wno-missing-field-initializers on Mac clang

--- a/tool

+++ b/tool

@@ -236,6 +236,14 @@

   if [[ $cc_id = tcc ]]; then

     add cc_flags -Wunsupported

   fi

+  if [[ $os = mac && $cc_id = clang ]]; then

+    # The clang that's shipped with Mac 10.12 has bad behavior for issuing

+    # warnings for structs initialed with {0} in C99. We have to disable this

+    # warning, or it will issue a bunch of useless warnings. It might be fixed

+    # in later versions, but Apple makes the version of clang/LLVM

+    # indecipherable, so we'll just always turn it off.

+    add cc_flags -Wno-missing-field-initializers

+  fi

   if [[ $lld_detected = 1 ]]; then

     add cc_flags -fuse-ld=lld

   fi