From 74bf17bb0dee27a431e2fc6d0e07ee1df833cf1b Mon Sep 17 00:00:00 2001
From: Jeff Epler <jepler@gmail.com>
Date: Sun, 1 Mar 2020 11:48:20 -0600
Subject: [PATCH] Makefiles: add targets to build unix port, mpy-cross for
 fuzzing

This assumes you have properly install afl-fuzz with afl-clang-fast.
Tested with AFLplusplus 2.60c-75-g2c6847b.
---
 mpy-cross/.gitignore    |  1 +
 mpy-cross/Makefile.fuzz |  6 ++++++
 ports/unix/Makefile     | 12 ++++++++++++
 3 files changed, 19 insertions(+)
 create mode 100644 mpy-cross/Makefile.fuzz

diff --git a/mpy-cross/.gitignore b/mpy-cross/.gitignore
index 0681b685fa..80d7acd423 100644
--- a/mpy-cross/.gitignore
+++ b/mpy-cross/.gitignore
@@ -3,4 +3,5 @@
 /mpy-cross.static
 /mpy-cross.static.exe
 /mpy-cross.static-raspbian
+/mpy-cross.fuzz
 /pitools
diff --git a/mpy-cross/Makefile.fuzz b/mpy-cross/Makefile.fuzz
new file mode 100644
index 0000000000..ca59788f4c
--- /dev/null
+++ b/mpy-cross/Makefile.fuzz
@@ -0,0 +1,6 @@
+
+PROG=mpy-cross.fuzz
+BUILD=build-static
+STATIC_BUILD=1
+CC=afl-clang-fast
+include mpy-cross.mk
diff --git a/ports/unix/Makefile b/ports/unix/Makefile
index 7ffa0fd082..63c4980c31 100644
--- a/ports/unix/Makefile
+++ b/ports/unix/Makefile
@@ -277,6 +277,18 @@ coverage_test: coverage
 coverage_clean:
 	$(MAKE) V=2 BUILD=build-coverage PROG=micropython_coverage clean
 
+# build an interpreter for fuzzing
+fuzz:
+	$(MAKE) \
+	    CC=afl-clang-fast DEBUG=1 \
+	    CFLAGS_EXTRA='$(CFLAGS_EXTRA) -ffunction-sections' \
+	    LDFLAGS_EXTRA='$(LDFLAGS_EXTRA)' \
+	    BUILD=build-fuzz PROG=micropython_fuzz
+
+fuzz_clean:
+	$(MAKE) V=2 BUILD=build-fuzz PROG=micropython_fuzz clean
+
+
 # Value of configure's --host= option (required for cross-compilation).
 # Deduce it from CROSS_COMPILE by default, but can be overridden.
 ifneq ($(CROSS_COMPILE),)