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The existing NOTES-ANSI.md are renamed to NOTES-C99.md and updated accordingly. INSTALL.md lists C-99 compiler instead of ANSI-C now. Also moving from ANSI-C to C-99 warrants updates to NEWS.md and CHANGES.md. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Neil Horman <nhorman@openssl.org> Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com> (Merged from https://github.com/openssl/openssl/pull/27751)
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Notes on C-99
This file contains a list of C-99 features we don't allow for OpenSSL. Starting with 3.6 OpenSSL project is going to gradually adopt C-99 features. The plan is to bring those features in small steps. Either with new code where particular C-99 construct makes sense (think of designated initializers), or when refactoring existing code and using C-99 language feature improves readability/maintainability of the code. C-99 seems to be implemented by major compilers (clang, gcc, msvc), therefore we can opt for permissive policy to adopt C-99 standard. This approach means OpenSSL project accepts all C-99 features except those explicitly listed here. The list here is going to be updated by features we either
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find not useful (or not a good match) for OpenSSL
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the feature is not implemented by some non-mainstream compiler which we need to keep supported for benefit of OpenSSL users
The list of C-99 features we don't support in OpenSSL project follows:
- do not use
//for comments, stick to/* ... */