[foxy backport] Added Doxyfile and fixed related warnings (#42)

rcl_logging_spdlog/Doxyfile

@@ -0,0 +1,28 @@
+# All settings not listed here will use the Doxygen default values.
+
+PROJECT_NAME           = "rcl_logging_spdlog"
+PROJECT_NUMBER         = master
+PROJECT_BRIEF          = "Implementation of rcl_logging API for an spdlog backend."
+
+# Use these lines to include the generated logging_macro.h (update install path if needed)
+INPUT                  = README.md ../../../../install/rcl_logging_interface/include ./QUALITY_DECLARATION.md
+
+# Otherwise just generate for the local (non-generated header files)
+USE_MDFILE_AS_MAINPAGE = README.md
+RECURSIVE              = YES
+OUTPUT_DIRECTORY       = doc_output
+
+EXTRACT_ALL            = YES
+SORT_MEMBER_DOCS       = NO
+
+GENERATE_LATEX         = NO
+
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = YES
+EXPAND_ONLY_PREDEF     = YES
+
+# Tag files that do not exist will produce a warning and cross-project linking will not work.
+TAGFILES += "../../../doxygen_tag_files/cppreference-doxygen-web.tag.xml=http://en.cppreference.com/w/"
+TAGFILES += "../../../doxygen_tag_files/rcutils.tag=http://docs.ros2.org/latest/api/rcutils/"
+# Uncomment to generate tag files for cross-project linking.
+GENERATE_TAGFILE = "../../../doxygen_tag_files/rcl_logging_spdlog.tag"

rcl_logging_spdlog/QUALITY_DECLARATION.md

@@ -1,6 +1,6 @@
 This document is a declaration of software quality for the `rcl_logging_spdlog` package, based on the guidelines in [REP-2004](https://github.com/ros-infrastructure/rep/blob/rep-2004/rep-2004.rst).
 
-# `rcl_logging_spdlog` Quality Declaration
+# rcl_logging_spdlog Quality Declaration
 
 The package `rcl_logging_spdlog` claims to be in the **Quality Level 4** category.
 

rcl_logging_spdlog/README.md

@@ -14,4 +14,4 @@ Some useful internal abstractions and utilities:
 
 ## Quality Declaration
 
-This package claims to be in the **Quality Level 4** category, see the [Quality Declaration](./Quality_Declaration.md) for more details.
+This package claims to be in the **Quality Level 4** category, see the [Quality Declaration](./QUALITY_DECLARATION.md) for more details.