drop support for llvm < 6.0

GNUmakefile.llvm

@@ -36,7 +36,7 @@ ifeq "$(SYS)" "OpenBSD"
   LLVM_CONFIG ?= $(BIN_PATH)/llvm-config
   HAS_OPT = $(shell test -x $(BIN_PATH)/opt && echo 0 || echo 1)
   ifeq "$(HAS_OPT)" "1"
-    $(warning llvm_mode needs a complete llvm installation (versions 3.4 up to 12) -> e.g. "pkg_add llvm-7.0.1p9")
+    $(warning llvm_mode needs a complete llvm installation (versions 6.0 up to 12) -> e.g. "pkg_add llvm-7.0.1p9")
   endif
 else
   LLVM_CONFIG ?= llvm-config
@@ -45,7 +45,7 @@ endif
 LLVMVER  = $(shell $(LLVM_CONFIG) --version 2>/dev/null | sed 's/git//' | sed 's/svn//' )
 LLVM_MAJOR = $(shell $(LLVM_CONFIG) --version 2>/dev/null | sed 's/\..*//' )
 LLVM_MINOR = $(shell $(LLVM_CONFIG) --version 2>/dev/null | sed 's/.*\.//' | sed 's/git//' | sed 's/svn//' | sed 's/ .*//' )
-LLVM_UNSUPPORTED = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^3\.[0-3]|^[0-2]\.' && echo 1 || echo 0 )
+LLVM_UNSUPPORTED = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^[0-5]\.' && echo 1 || echo 0 )
 LLVM_TOO_NEW = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^1[3-9]' && echo 1 || echo 0 )
 LLVM_NEW_API = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^1[0-9]' && echo 1 || echo 0 )
 LLVM_10_OK = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^1[1-9]|^10\.[1-9]|^10\.0.[1-9]' && echo 1 || echo 0 )
@@ -61,7 +61,7 @@ ifeq "$(LLVMVER)" ""
 endif
 
 ifeq "$(LLVM_UNSUPPORTED)" "1"
-  $(error llvm_mode only supports llvm from version 3.4 onwards)
+  $(error llvm_mode only supports llvm from version 6.0 onwards)
 endif
 
 ifeq "$(LLVM_TOO_NEW)" "1"
@@ -346,7 +346,7 @@ no_build:
 test_deps:
 	@echo "[*] Checking for working 'llvm-config'..."
  ifneq "$(LLVM_APPLE_XCODE)" "1"
-	@type $(LLVM_CONFIG) >/dev/null 2>&1 || ( echo "[-] Oops, can't find 'llvm-config'. Install clang or set \$$LLVM_CONFIG or \$$PATH beforehand."; echo "    (Sometimes, the binary will be named llvm-config-3.5 or something like that.)"; exit 1 )
+	@type $(LLVM_CONFIG) >/dev/null 2>&1 || ( echo "[-] Oops, can't find 'llvm-config'. Install clang or set \$$LLVM_CONFIG or \$$PATH beforehand."; echo "    (Sometimes, the binary will be named llvm-config-11 or something like that.)"; exit 1 )
  endif
 	@echo "[*] Checking for working '$(CC)'..."
 	@type $(CC) >/dev/null 2>&1 || ( echo "[-] Oops, can't find '$(CC)'. Make sure that it's in your \$$PATH (or set \$$CC and \$$CXX)."; exit 1 )

README.md

@@ -84,7 +84,7 @@ behaviours and defaults:
 
 ## Important features of afl++
 
-  afl++ supports llvm up to version 12, very fast binary fuzzing with QEMU 5.1
+  afl++ supports llvm from 6.0 up to version 12, very fast binary fuzzing with QEMU 5.1
   with laf-intel and redqueen, frida mode, unicorn mode, gcc plugin, full *BSD,
   Mac OS, Solaris and Android support and much, much, much more.
 
@@ -293,7 +293,7 @@ anything below 9 is not recommended.
     |
     v
 +---------------------------------+
-| clang/clang++ 3.3+ is available | --> use LLVM mode (afl-clang-fast/afl-clang-fast++)
+| clang/clang++ 6.0+ is available | --> use LLVM mode (afl-clang-fast/afl-clang-fast++)
 +---------------------------------+     see [instrumentation/README.llvm.md](instrumentation/README.llvm.md)
     |
     | if not, or if the target fails with LLVM afl-clang-fast/++

docs/Changelog.md

@@ -30,6 +30,7 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
       -i dir crashes the target or results in a timeout. By default
       afl++ ignores these and uses them for splicing instead.
   - afl-cc:
+    - We do not support llvm versions prior 6.0 anymore
     - Leak Sanitizer (AFL_USE_LSAN) added by Joshua Rogers, thanks!
     - Removed InsTrim instrumentation as it is not as good as PCGUARD
     - Removed automatic linking with -lc++ for LTO mode

instrumentation/README.llvm.md

@@ -6,7 +6,7 @@
 
 ## 1) Introduction
 
-! llvm_mode works with llvm versions 3.4 up to 12 !
+! llvm_mode works with llvm versions 6.0 up to 12 !
 
 The code in this directory allows you to instrument programs for AFL using
 true compiler-level instrumentation, instead of the more crude