3 files changed, 62 insertions, 7 deletions
diff --git a/docs/Changelog.md b/docs/Changelog.md
index facf2196..c52ddd56 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -3,7 +3,7 @@
   This is the list of all noteworthy changes made in every public
   release of the tool. See README.md for the general instruction manual.
 
-### Version ++4.07a (dev)
+### Version ++4.07c (release)
   - afl-fuzz:
     - reverse reading the seeds only on restarts (increases performance)
     - new env `AFL_POST_PROCESS_KEEP_ORIGINAL` to keep the orignal
@@ -18,6 +18,7 @@
     - rewrote our PCGUARD pass to be compatible with LLVM 15+ shenanigans,
       requires LLVM 13+ now instead of 10.0.1+
     - fallback to native LLVM PCGUARD if our PCGUARD is unavailable
+    - fixed a crash in GCC CMPLOG
   - afl-showmap:
     - added custom mutator post_process and send support
     - add `-I filelist` option, an alternative to `-i in_dir`
diff --git a/docs/FAQ.md b/docs/FAQ.md
index 8178db46..9275eb94 100644
--- a/docs/FAQ.md
+++ b/docs/FAQ.md
@@ -279,3 +279,54 @@ If you find an interesting or important question missing, submit it via
 
   Solution: just do an `export AFL_MAP_SIZE=(the value in the warning)`.
 </p></details>
+
+<details>
+  <summary id="linker-errors">Linker errors.</summary><p>
+
+  If you compile C++ harnesses and see `undefined reference` errors for
+  variables named `__afl_...`, e.g.:
+
+  ```
+  /usr/bin/ld: /tmp/test-d3085f.o: in function `foo::test()':
+  test.cpp:(.text._ZN3fooL4testEv[_ZN3fooL4testEv]+0x35): undefined reference to `foo::__afl_connected'
+  clang: error: linker command failed with exit code 1 (use -v to see invocation)
+  ```
+
+  Then you use AFL++ macros like `__AFL_LOOP` within a namespace and this
+  will not work.
+
+  Solution: Move that harness portion to the global namespace, e.g. before:
+  ```
+  #include <cstdio>
+  namespace foo {
+    static void test() {
+      while(__AFL_LOOP(1000)) {
+        foo::function();
+      }
+    }
+  }
+
+  int main(int argc, char** argv) {
+    foo::test();
+    return 0;
+  }
+  ```
+  after:
+  ```
+  #include <cstdio>
+  static void mytest() {
+    while(__AFL_LOOP(1000)) {
+      foo::function();
+    }
+  }
+  namespace foo {
+    static void test() {
+      mytest();
+    }
+  }
+  int main(int argc, char** argv) {
+    foo::test();
+    return 0;
+  }
+  ```
+</p></details>
diff --git a/docs/custom_mutators.md b/docs/custom_mutators.md
index 3f7e9e6e..c5a64622 100644
--- a/docs/custom_mutators.md
+++ b/docs/custom_mutators.md
@@ -145,12 +145,15 @@ def deinit():  # optional for Python
 
 - `fuzz` (optional):
 
-    This method performs custom mutations on a given input. It also accepts an
-    additional test case. Note that this function is optional - but it makes
-    sense to use it. You would only skip this if `post_process` is used to fix
-    checksums etc. so if you are using it, e.g., as a post processing library.
-    Note that a length > 0 *must* be returned!
-    The returned output buffer is under **your** memory management!
+    This method performs your custom mutations on a given input.
+    The add_buf is the contents of another queue item that can be used for
+    splicing - or anything else - and can also be ignored. If you are not
+    using this additional data then define `splice_optout` (see above).
+    This function is optional.
+    Returing a length of 0 is valid and is interpreted as skipping this
+    one mutation result.
+    For non-Python: the returned output buffer is under **your** memory
+    management!
 
 - `describe` (optional):