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tool/set_analyzer_env: disable implicit-integer-truncation

with clang-7 this causes additional warnings in x86 intrinsics and
elsewhere. disabling for now to unblock new changes.

BUG=webm:1615

Change-Id: Ide9cacee5547ed432f980f6804e1414f32639121

--- a/tools/set_analyzer_env.sh

+++ b/tools/set_analyzer_env.sh

@@ -82,6 +82,17 @@

   export AR="llvm-ar"

 fi

+# TODO(http://crbug.com/webm/1615): -fsanitize=implicit-integer-truncation

+# causes conversion warnings in many of the x86 intrinsics and elsewhere.

+if [ "${sanitizer}" = "integer" ]; then

+  major_version=$(clang --version | head -n 1 \

+    | grep -o -E "[[:digit:]]\.[[:digit:]]\.[[:digit:]]" | cut -f1 -d.)

+  if [ ${major_version} -ge 7 ]; then

+    cflags="${cflags} -fno-sanitize=implicit-integer-truncation"

+    ldflags="${ldflags} -fno-sanitize=implicit-integer-truncation"

+  fi

+fi

+

 set -x

 export CC="clang"

 export CXX="clang++"