[test suite] support afl-fuzz on Mac OS X which uses afl-clang

Makefile.am

@@ -366,6 +366,7 @@ EXTRA_DIST = \
     test/asan/Makefile \
     test/afl/compile/afl-compile-code-coverage.sh \
     test/afl/compile/afl-compile.sh \
+    test/afl/compile/fcns \
     test/afl/doc/AFL_status_screen.png \
     test/afl/README.md \
     test/afl/fuzzing-wrappers/client-rc.sh \

test/afl/compile/afl-asan-compile.sh

@@ -1,8 +1,13 @@
 #!/bin/sh -x
 
+. ./compile/fcns
+
+### set either afl-gcc or afl-clang (defaults to afl-gcc)
+set_afl_cc
+
 cd ../../
 
-AFL_USE_ASAN=1 CC=afl-gcc ./extras/apparmor/configure_args.sh --enable-afl-fuzzing --without-gpgme --enable-32bit-mode --enable-asan-support $@
+AFL_USE_ASAN=1 CC=$AFL_CC ./extras/apparmor/configure_args.sh --enable-afl-fuzzing --without-gpgme --enable-32bit-mode --enable-asan-support $@
 
 if [ $? -ne 0 ]
 then

test/afl/compile/afl-compile.sh

@@ -1,8 +1,13 @@
 #!/bin/sh -x
 
+. ./compile/fcns
+
+### set either afl-gcc or afl-clang (defaults to afl-gcc)
+set_afl_cc
+
 cd ../../
 
-CC=afl-gcc ./extras/apparmor/configure_args.sh --enable-afl-fuzzing $@
+CC=$AFL_CC ./extras/apparmor/configure_args.sh --enable-afl-fuzzing $@
 
 if [ $? -ne 0 ]
 then

test/afl/compile/fcns

@@ -0,0 +1,11 @@
+
+AFL_CC=afl-gcc
+
+set_afl_cc() {
+    $AFL_CC /dev/null 2>&1 | grep -q -i "On Apple systems.*wrapper for clang"
+    if [ $? -eq 0 ]
+    then
+        ### Need to switch to afl-clang
+        AFL_CC=afl-clang
+    fi
+}