From 3e5f463646823cbb8e14e2ff5d0c7fbc8d830c29 Mon Sep 17 00:00:00 2001
From: "Ian A. Mason" <iam@csl.sri.com>
Date: Mon, 29 Jul 2019 16:47:56 -0700
Subject: [PATCH] bzip2 joins the ranks of the examples.

---
 examples/bzip2/Makefile  | 63 ++++++++++++++++++++++++++++++++++++++++
 examples/bzip2/patch.txt |  4 +++
 2 files changed, 67 insertions(+)
 create mode 100644 examples/bzip2/Makefile
 create mode 100644 examples/bzip2/patch.txt

diff --git a/examples/bzip2/Makefile b/examples/bzip2/Makefile
new file mode 100644
index 0000000..6f2c44a
--- /dev/null
+++ b/examples/bzip2/Makefile
@@ -0,0 +1,63 @@
+all: bzip2.bc bzip2_from_bitcode test
+
+
+./bzip2:
+	git clone git://sourceware.org/git/bzip2.git
+# the patch is to remove the hard coded "CC=gcc". Bad Julian. No biscuit.
+	patch bzip2/Makefile < patch.txt
+
+./bzip2/bzip2: bzip2
+	CC=gclang make -C bzip2
+
+./bzip2.bc: bzip2/bzip2
+	get-bc -o bzip2.bc bzip2/bzip2
+
+# to build an bitcode archive we do not use any additional flags; the '-m' flag writes the manifest (i.e. the ingredients)
+libbz2.bca:
+	get-bc -m -o libbz2.bca bzip2/libbz2.a
+
+# to build a module we just use the '-b' flag; the '-m' flag writes the manifest (i.e. the ingredients)
+libbz2.a.bc:
+	get-bc -m -b -o libbz2.a.bc bzip2/libbz2.a
+
+# groked this list from the manifests
+modules: bzip2/bzip2
+	cp ./bzip2/.bzip2.c.o.bc      bzip2.c.o.bc
+	cp ./bzip2/.blocksort.c.o.bc  blocksort.c.o.bc
+	cp ./bzip2/.huffman.c.o.bc    huffman.c.o.bc
+	cp ./bzip2/.crctable.c.o.bc   crctable.c.o.bc
+	cp ./bzip2/.randtable.c.o.bc  randtable.c.o.bc
+	cp ./bzip2/.compress.c.o.bc   compress.c.o.bc
+	cp ./bzip2/.decompress.c.o.bc decompress.c.o.bc
+	cp ./bzip2/.bzlib.c.o.bc      bzlib.c.o.bc
+
+
+# the override flag is necessary and is there to prevent any complaints about multiple definitions.
+bzip2_from_bitcode: bzip2.bc modules
+	clang bzip2.c.o.bc blocksort.c.o.bc huffman.c.o.bc crctable.c.o.bc randtable.c.o.bc compress.c.o.bc decompress.c.o.bc bzlib.c.o.bc -o bzip2_from_bitcode
+
+test: bzip2_from_bitcode
+	./bzip2_from_bitcode -1  < ./bzip2/sample1.ref > sample1.rb2
+	./bzip2_from_bitcode -2  < ./bzip2/sample2.ref > sample2.rb2
+	./bzip2_from_bitcode -3  < ./bzip2/sample3.ref > sample3.rb2
+	./bzip2_from_bitcode -d  < ./bzip2/sample1.bz2 > sample1.tst
+	./bzip2_from_bitcode -d  < ./bzip2/sample2.bz2 > sample2.tst
+	./bzip2_from_bitcode -ds < ./bzip2/sample3.bz2 > sample3.tst
+	cmp ./bzip2/sample1.bz2 sample1.rb2
+	cmp ./bzip2/sample2.bz2 sample2.rb2
+	cmp ./bzip2/sample3.bz2 sample3.rb2
+	cmp sample1.tst ./bzip2/sample1.ref
+	cmp sample2.tst ./bzip2/sample2.ref
+	cmp sample3.tst ./bzip2/sample3.ref
+
+clean:
+	rm -f *.bc *.bca *.manifest bzip2_from_bitcode *.rb2 *.tst bzip2_slashed
+	rm -rf slash_specialized
+	make -C bzip2 clean
+
+spotless: clean
+	rm -rf bzip2 bzip2_tests
+
+
+
+.PHONY: clean spotless modules
diff --git a/examples/bzip2/patch.txt b/examples/bzip2/patch.txt
new file mode 100644
index 0000000..71cd215
--- /dev/null
+++ b/examples/bzip2/patch.txt
@@ -0,0 +1,4 @@
+18c18
+< CC=gcc
+---
+> CC?=gcc