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The only solution for mitigating ambiguity of a file, such as my_libraryOLD.h, is to rename old files with either a prefix (that would fall within the first eight characters) or add an extension (such as my_library.h.old).
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Related Guidelines
CERT C++ Secure Coding Standard: PRE08-CPP. Guarantee that header file names are unique
Bibliography
unmigrated-wiki-markup
\[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\] Section 6.10.2, "Source file inclusion" \[[MISRA 2004|AA. Bibliography#MISRA 04]\] Rule
MISRA Rule 19.5
Bibliography
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