tools: Add infrastructure to make it easier to run valgrind (envoypro…

…xy#3227)

Signed-off-by: Joshua Marantz <[email protected]>

tools/run-valgrind.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+#
+# Helper script to run tests under valgrind.  Usage:
+#    bazel test --run_under=`pwd`/tools/run-valgrind.sh ...
+#
+
+dir=$(dirname "$0")
+
+# In order to add suppressions, it's helpful to run the tool in a mode
+# where it uses the suppressions file we have so far, but also
+# generates possible new suppressions in the test output, so you can
+# paste them into the suppressions file.
+#yes | exec valgrind --gen-suppressions=yes --suppressions="$dir/valgrind-suppressions.txt" "$@"
+
+# Ordinarily, we run with cleaner output.
+exec valgrind --gen-suppressions=yes --suppressions="$dir/valgrind-suppressions.txt" "$@"

tools/valgrind-suppressions.txt

@@ -0,0 +1,6 @@
+{
+  eliminate new/free mismatch warnings altogether, as something in the current toolchain generates this scenario.
+  Memcheck:Free
+  fun:free
+  ...
+}