[build] add make target "tidy" for running clang-tidy

.clang-tidy

@@ -0,0 +1 @@
+Checks: '-clang-analyzer-security.insecureAPI.rand'

Makefile

@@ -69,6 +69,7 @@ run-valgrind-linux: linux
 
 # Generates a compilation database with ninja for use in clang tooling
 compdb: ; $(RUN) Ninja/compdb
+tidy: ; $(RUN) tidy
 
 .PHONY: android android-lib
 # Builds a particular android architecture.

scripts/clang-tidy.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+export PATH="`pwd`/.mason:${PATH}" MASON_DIR="`pwd`/.mason"
+
+command -v ${CLANG_TIDY:-clang-tidy} >/dev/null 2>&1 || {
+    echo "Can't find ${CLANG_TIDY:-clang-tidy} in PATH."
+    if [ -z ${CLANG_TIDY} ]; then
+        echo "Alternatively, you can set CLANG_TIDY to point to clang-tidy."
+    fi
+    exit 1
+}
+
+cd build/${HOST}-${HOST_VERSION}/${BUILDTYPE}
+
+git ls-files '../../../src/mbgl/*.cpp' '../../../platform/*.cpp' '../../../test/*.cpp' | \
+    xargs -I{} -P ${JOBS} ${CLANG_TIDY:-clang-tidy} -header-filter='\/mbgl\/' {}

scripts/main.mk

@@ -3,12 +3,12 @@ ifeq (,$(V))
 endif
 
 # Determine host platform
-HOST ?= $(BUILD)
+export HOST ?= $(BUILD)
 
 # Defines host defaults
 include scripts/$(HOST)/defaults.mk
 
-HOST_VERSION ?= $(BUILD_VERSION)
+export HOST_VERSION ?= $(BUILD_VERSION)
 
 # Optionally include version-specific host defaults
 -include scripts/$(HOST)/$(HOST_VERSION)/defaults.mk
@@ -20,7 +20,7 @@ ifneq (,$(wildcard scripts/$(HOST)/$(HOST_VERSION)/configure.sh))
 	CONFIGURE_FILES += scripts/$(HOST)/$(HOST_VERSION)/configure.sh
 endif
 
-HOST_SLUG = $(HOST)-$(HOST_VERSION)
+export HOST_SLUG = $(HOST)-$(HOST_VERSION)
 CONFIGURE_FILES = scripts/$(HOST)/configure.sh
 ifneq (,$(wildcard scripts/$(HOST)/$(HOST_VERSION)/configure.sh))
 	CONFIGURE_FILES += scripts/$(HOST)/$(HOST_VERSION)/configure.sh
@@ -153,6 +153,14 @@ Ninja/compdb: Ninja/__project__
 	$(QUIET)$(ENV) deps/ninja/ninja-$(HOST) -C build/$(HOST_SLUG)/$(BUILDTYPE) \
 		-t compdb cc cc_s cxx objc objcxx > $(OUTPUT)
 
+#### Tidy ######################################################################
+
+tidy: Ninja/compdb
+	@printf "$(TEXT_BOLD)$(COLOR_GREEN)* Generating header files...$(FORMAT_END)\n"
+	$(QUIET)$(ENV) deps/ninja/ninja-$(HOST) -C build/$(HOST_SLUG)/$(BUILDTYPE) version shaders
+	@printf "$(TEXT_BOLD)$(COLOR_GREEN)* Running tidy...$(FORMAT_END)\n"
+	@./scripts/clang-tidy.sh
+
 #### Run tests #################################################################
 
 test-%: Makefile/test