lint: add dash extended cpp linter

Signed-off-by: pasta <pasta@dashboost.org>

ci/Dockerfile.builder

@@ -40,7 +40,7 @@ RUN apt-get update && apt-get install $APT_ARGS g++-mingw-w64-i686 && rm -rf /va
 RUN apt-get update && apt-get install $APT_ARGS g++-mingw-w64-x86-64 && rm -rf /var/lib/apt/lists/*
 RUN apt-get update && apt-get install $APT_ARGS wine-stable wine32 wine64 bc nsis && rm -rf /var/lib/apt/lists/*
 RUN apt-get update && apt-get install $APT_ARGS python3-zmq && rm -rf /var/lib/apt/lists/*
-RUN apt-get update && apt-get install $APT_ARGS shellcheck && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install $APT_ARGS shellcheck cppcheck && rm -rf /var/lib/apt/lists/*
 RUN apt-get update && apt-get install $APT_ARGS imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools && rm -rf /var/lib/apt/lists/*
 
 # This is a hack. It is needed because gcc-multilib and g++-multilib are conflicting with g++-arm-linux-gnueabihf. This is

test/lint/lint-cppcheck-dash.sh

@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+
+export LC_ALL=C
+
+ENABLED_CHECKS=(
+    "Class '.*' has a constructor with 1 argument that is not explicit."
+    "Struct '.*' has a constructor with 1 argument that is not explicit."
+    "Function parameter '.*' should be passed by const reference."
+    "Comparison of modulo result is predetermined"
+    "Local variable '.*' shadows outer argument"
+    "Redundant initialization for '.*'. The initialized value is overwritten before it is read."
+    "Dereferencing '.*' after it is deallocated / released"
+    "The scope of the variable '.*' can be reduced."
+    "Parameter '.*' can be declared with const"
+    "Variable '.*' can be declared with const"
+    "Variable '.*' is assigned a value that is never used."
+    "Unused variable"
+    "The function '.*' overrides a function in a base class but is not marked with a 'override' specifier."
+# Enabale to catch all warnings
+#    ".*"
+# We may choose to enable these in the future
+#    "Variable '.*' is assigned in constructor body. Consider performing initialization in initialization list."
+#    "Member variable '.*' is not initialized in the constructor."
+#    "Consider using std::copy algorithm instead of a raw loop."
+#    "Consider using std::any_of algorithm instead of a raw loop."
+#    "Consider using std::accumulate algorithm instead of a raw loop."
+#    "Consider using std::copy algorithm instead of a raw loop."
+#    "Consider using std::transform algorithm instead of a raw loop."
+#    "Consider using std::find_if algorithm instead of a raw loop."
+)
+
+IGNORED_WARNINGS=(
+    "src/bls/bls.h:.* Struct 'CBLSIdImplicit' has a constructor with 1 argument that is not explicit."
+    "src/llmq/quorums_init.cpp:.* warning: Variable 'llmqDbTmp' is assigned a value that is never used."
+    "src/llmq/quorums.cpp:.* warning: Parameter '_blsWorker' can be declared with const"
+
+# General catchall, for some reason any value named 'hash' is viewed as never used.
+    "Variable 'hash' is assigned a value that is never used."
+
+# The following can be useful to ignore when the catch all is used
+#    "Consider performing initialization in initialization list."
+#    "Consider using std::transform algorithm instead of a raw loop."
+#    "Consider using std::accumulate algorithm instead of a raw loop."
+#    "Consider using std::any_of algorithm instead of a raw loop."
+#    "Consider using std::count_if algorithm instead of a raw loop."
+#    "Member variable '.*' is not initialized in the constructor."
+#    "Consider using std::find_if algorithm instead of a raw loop."
+)
+
+# We should attempt to update this with all dash specific code
+FILES=$(git ls-files -- "src/bls/*.cpp" "src/bls/*.h" "src/coinjoin/*.cpp" "src/coinjoin/*.h" "src/evo/*.cpp" \
+                        "src/evo/*.h" "src/governance/*.cpp" "src/governance/*.h" "src/llmq/*.cpp" "src/llmq/*.h" \
+                        "src/masternode/*.cpp" "src/masternode/*.h" "src/dsnotificationinterface.*" "src/spork.*" \
+                        "src/rpc/coinjoin.cpp" "src/rpc/governance.cpp" "src/rpc/masternode.cpp" "src/rpc/rpcevo.cpp" \
+                        "src/rpc/rpcquorums.cpp")
+
+
+if ! command -v cppcheck > /dev/null; then
+    echo "Skipping cppcheck linting since cppcheck is not installed."
+    exit 0
+fi
+
+function join_array {
+    local IFS="$1"
+    shift
+    echo "$*"
+}
+
+ENABLED_CHECKS_REGEXP=$(join_array "|" "${ENABLED_CHECKS[@]}")
+IGNORED_WARNINGS_REGEXP=$(join_array "|" "${IGNORED_WARNINGS[@]}")
+FILES_REGEXP=$(join_array "|" "${FILES[@]}")
+WARNINGS=$(echo "${FILES}" | \
+    xargs cppcheck --enable=all -j "$(getconf _NPROCESSORS_ONLN)" --language=c++ --std=c++14 --template=gcc -D__cplusplus -DENABLE_WALLET -DCLIENT_VERSION_BUILD -DCLIENT_VERSION_IS_RELEASE -DCLIENT_VERSION_MAJOR -DCLIENT_VERSION_MINOR -DCLIENT_VERSION_REVISION -DCOPYRIGHT_YEAR -DDEBUG -DHAVE_WORKING_BOOST_SLEEP_FOR -DCHAR_BIT=8 -I src/ -q 2>&1 | sort -u | \
+    grep -E "${ENABLED_CHECKS_REGEXP}" | \
+    grep -vE "${IGNORED_WARNINGS_REGEXP}" | \
+    grep -E "${FILES_REGEXP}")
+
+if [[ ${WARNINGS} != "" ]]; then
+    echo "${WARNINGS}"
+    echo
+    echo "Advice not applicable in this specific case? Add an exception by updating"
+    echo "IGNORED_WARNINGS in $0"
+    # Uncomment to enforce the linter / comment to run locally
+    exit 1
+fi
+exit 0