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document changes to __CC65__

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mrdudz 2022-05-10 01:13:24 +02:00
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doc/cc65.sgml
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@ -1102,8 +1102,20 @@ The compiler defines several macros at startup:
<tag><tt>__CC65__</tt></tag>
This macro is always defined. Its value is the version number of the
compiler in hex. For example, version 2.14 of the compiler has this macro
defined as <tt/0x02E0/.
compiler in hex: <tt>(VER_MAJOR * 0x100) + VER_MINOR</tt>. The upper 8 bits
are the major-, the lower 8 bits are the minor version. For example, version
47.11 of the compiler would have this macro defined as <tt/0x2f0b/.
Note: until 2.19 this macro was defined as <tt>(VER_MAJOR * 0x100) + VER_MINOR * 0x10</tt> -
which resulted in broken values starting at version 2.16 of the compiler. For
this reason the value of this macro is considered purely informal - you should
not use it to check for a specific compiler version and use different code
according to the detected version - please update your code to work with the
recent version of the compiler instead (There is very little reason to not use
the most recent version - and even less to support older versions in your code).
Should you still insist on doing this for some reason - look at <tt>checkversion.c</tt>
in the samples directory for some preprocessor kludges that might help.
<tag><tt>__CC65_STD__</tt></tag>