Update walkthrough-creating-and-using-a-dynamic-link-library-cpp.md

[garlfield]

Add description of precompiler steps in case the project name does not match.

[PRMerger17]

@garlfield : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[opbld33]

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[Jak-MS]

@corob-msft

Can you review this PR?

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[colin-home]

@garlfield
Thanks for being extremely patient.

Looking at your addition, it's good to know how to set preprocessor definitions in your project properties. However, I'm having trouble with the idea that you'd ever need to change the <PROJECTNAME>_EXPORTS value in the middle of this walkthrough. If you create a new project with your preferred name, say, MyNewLibrary, that name will also be used in the preprocessor macros generated by the template, such as MYNEWLIBRARY_EXPORTS. You won't need to edit them after the fact. The only time you'd need the step you described is if you've decided to change the project name after creating the project, and you want everything to match - which is outside of the scope of the walkthrough.

It pains me to reject a submission, and the generous work it represents, but I'll need more convincing about its utility before I adopt this change. Feel free to make your case in comments below. For now, I'm closing the PR.

[opbld30]

Docs Build status updates of commit ae5424d:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/build/walkthrough-creating-and-using-a-dynamic-link-library-cpp.md	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel