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9 changes: 5 additions & 4 deletions policies/coding-style.md
Original file line number Diff line number Diff line change
Expand Up @@ -705,10 +705,11 @@ it portable enough to meet our multi-platform support goals.

## Chapter 14: Portability

To maximise portability the version of C defined in ISO/IEC 9899:1990
should be used. This is more commonly referred to as C90. ISO/IEC 9899:1999
(also known as C99) is not supported on some platforms that OpenSSL is
used on and therefore should be avoided.
To maximise portability the version of C defined in ISO/IEC 9899:1999
should be used. This is more commonly referred to as C99. C99 can be
used on code targeting 3.6 and newer branches. Code which is intended
to be backported to 3.5 and earlier branches should use
ISO/IEC 9899:1990 (a.k.a. C90).

## Chapter 15: Expressions

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