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# Important changes in AFL++
This document lists important changes in AFL++, for example, major behavior changes.
## From version 3.00 onwards
With AFL++ 3.13-3.20 we introduce frida_mode (-O) to have an alternative for
binary-only fuzzing. It is slower than Qemu mode but works on MacOS, Android,
iOS etc.
With AFL++ 3.15 we introduced the following changes from previous behaviors:
* Also -M main mode does not do deterministic fuzzing by default anymore
* afl-cmin and afl-showmap -Ci now descent into subdirectories like
afl-fuzz -i does (but note that afl-cmin.bash does not)
With AFL++ 3.14 we introduced the following changes from previous behaviors:
* afl-fuzz: deterministic fuzzing it not a default for -M main anymore
* afl-cmin/afl-showmap -i now descends into subdirectories (afl-cmin.bash,
however, does not)
With AFL++ 3.10 we introduced the following changes from previous behaviors:
* The '+' feature of the '-t' option now means to auto-calculate the timeout
with the value given being the maximum timeout. The original meaning of
"skipping timeouts instead of abort" is now inherent to the -t option.
With AFL++ 3.00 we introduced changes that break some previous AFL and AFL++
behaviors and defaults:
* There are no llvm_mode and gcc_plugin subdirectories anymore and there is
only one compiler: afl-cc. All previous compilers now symlink to this one.
All instrumentation source code is now in the `instrumentation/` folder.
* The gcc_plugin was replaced with a new version submitted by AdaCore that
supports more features. Thank you!
* qemu_mode got upgraded to QEMU 5.1, but to be able to build this a current
ninja build tool version and python3 setuptools are required.
qemu_mode also got new options like snapshotting, instrumenting specific
shared libraries, etc. Additionally QEMU 5.1 supports more CPU targets so
this is really worth it.
* When instrumenting targets, afl-cc will not supersede optimizations anymore
if any were given. This allows to fuzz targets build regularly like those
for debug or release versions.
* afl-fuzz:
* if neither -M or -S is specified, `-S default` is assumed, so more
fuzzers can easily be added later
* `-i` input directory option now descends into subdirectories. It also
does not fatal on crashes and too large files, instead it skips them
and uses them for splicing mutations
* -m none is now default, set memory limits (in MB) with e.g. -m 250
* deterministic fuzzing is now disabled by default (unless using -M) and
can be enabled with -D
* a caching of test cases can now be performed and can be modified by
editing config.h for TESTCASE_CACHE or by specifying the environment
variable `AFL_TESTCACHE_SIZE` (in MB). Good values are between 50-500
(default: 50).
* -M mains do not perform trimming
* examples/ got renamed to utils/
* libtokencap/ libdislocator/ and qdbi_mode/ were moved to utils/
* afl-cmin/afl-cmin.bash now search first in PATH and last in AFL_PATH
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