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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> <tag><tt>__CC65__</tt></tag>
This macro is always defined. Its value is the version number of the 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 compiler in hex: <tt>(VER_MAJOR * 0x100) + VER_MINOR</tt>. The upper 8 bits
defined as <tt/0x02E0/. 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> <tag><tt>__CC65_STD__</tt></tag>