Fix deprecation warnings for message constants (backport #750) #751
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Fixes #743 This patch fixes two issues: 1. Code generation for `rosidl_typesupport_introspection_cpp` was overriding user-provided compile definitons, hiding the `-Wdeprecated` warnings in generated code, that users did see in `rosidl_typesupport_fastrtps_cpp`, which was not overriding those compile flags. This inconsistent result confused the issue of why we were seeing deprecation warnings in some portion of the build but not others 1. `#ifdef`s out a variable definition for message constant members that is now deprecated in C++17. In C++14 it was still necessary to define a `static constexpr` member variable outside the class, but as of C++17 those `static constexpr` vars are now automatically inlined so the declaration and definiton are the same line, making the external definition redundant. Signed-off-by: Emerson Knapp <emerson.b.knapp@gmail.com> (cherry picked from commit 1228f54)
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Running against one PR at a time, since they are independent Pulls: #751
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This is an automatic backport of pull request #750 done by Mergify.
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