Make sure logger levels stay in sync across files

.travis/cmake-linux

@@ -85,6 +85,8 @@ travis_script() {
   # Use () to run in a separate process so the exports are local.
   (run_static_analysis)
 
+  other/analysis/check_logger_levels
+
   cmake -B_build -H. \
     -DCMAKE_C_FLAGS="$C_FLAGS" \
     -DCMAKE_CXX_FLAGS="$CXX_FLAGS" \

other/analysis/check_logger_levels

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# Make sure that logger levels in toxcore/logger.h, CMakeLists.txt and
+# configure.ac stay in sync.
+
+set -ex
+
+TMP_DIR="$(mktemp -d)"
+
+# ^\s+LOGGER_LEVEL_(\w+),?$
+sed -n 's/^\s\+LOGGER_LEVEL_\(\w\+\),\?$/\1/p' toxcore/logger.h > "${TMP_DIR}/logger.h"
+# ^.*\$\{MIN_LOGGER_LEVEL\}" STREQUAL "(\w+)".*$
+sed -n 's/^.*\${MIN_LOGGER_LEVEL}\" STREQUAL \"\(\w\+\)\".*$/\1/p' CMakeLists.txt > "${TMP_DIR}/CMakeLists.txt"
+# ^.*LOGGER_LEVEL_(\w+).*$
+sed -n 's/^.*LOGGER_LEVEL_\(\w\+\).*$/\1/p' configure.ac > "${TMP_DIR}/configure.ac"
+
+diff -u "${TMP_DIR}/CMakeLists.txt" "${TMP_DIR}/logger.h"
+diff -u "${TMP_DIR}/configure.ac" "${TMP_DIR}/logger.h"

toxcore/logger.h

@@ -32,6 +32,7 @@
 #define MIN_LOGGER_LEVEL LOGGER_LEVEL_INFO
 #endif
 
+// NOTE: Don't forget to update build system files after modifying the enum.
 typedef enum Logger_Level {
     LOGGER_LEVEL_TRACE,
     LOGGER_LEVEL_DEBUG,