[PATCH 1/6] Build basic shared library framework

[Jes Sorensen <jes.sorensen@gmail.com>]

From: Jes Sorensen <jsorensen@fb.com>

This introduces a dummy shared library to start moving things into.

Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
 Makefile    | 18 +++++++++++++++---
 libverity.c | 10 ++++++++++
 2 files changed, 25 insertions(+), 3 deletions(-)
 create mode 100644 libverity.c

diff --git a/Makefile b/Makefile
index b9c09b9..bb85896 100644
--- a/Makefile
+++ b/Makefile
@@ -1,20 +1,32 @@
 EXE := fsverity
+LIB := libfsverity.so
 CFLAGS := -O2 -Wall
 CPPFLAGS := -D_FILE_OFFSET_BITS=64
 LDLIBS := -lcrypto
 DESTDIR := /usr/local
+LIBDIR := /usr/lib64
 SRC := $(wildcard *.c)
-OBJ := $(SRC:.c=.o)
+OBJ := fsverity.o hash_algs.o cmd_enable.o cmd_measure.o cmd_sign.o util.o
+SSRC := libverity.c
+SOBJ := libverity.so
 HDRS := $(wildcard *.h)
 
 all:$(EXE)
 
-$(EXE):$(OBJ)
+$(EXE):$(OBJ) $(LIB)
+	$(CC) -o $@ $(OBJ) $(LDLIBS) -L . -l fsverity
 
 $(OBJ): %.o: %.c $(HDRS)
+	$(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@
+
+$(SOBJ): %.so: %.c $(HDRS)
+	$(CC) -c -fPIC $(CFLAGS) $(CPPFLAGS) $< -o $@
+
+libfsverity.so: $(SOBJ)
+	$(CC) $(LDLIBS) -shared -o libfsverity.so $(SOBJ)
 
 clean:
-	rm -f $(EXE) $(OBJ)
+	rm -f $(EXE) $(OBJ) $(SOBJ) $(LIB)
 
 install:all
 	install -Dm755 -t $(DESTDIR)/bin $(EXE)
diff --git a/libverity.c b/libverity.c
new file mode 100644
index 0000000..6821aa2
--- /dev/null
+++ b/libverity.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The 'fsverity library'
+ *
+ * Copyright (C) 2018 Google LLC
+ * Copyright (C) 2020 Facebook
+ *
+ * Written by Eric Biggers and Jes Sorensen.
+ */
+
-- 
2.24.1