Add a makefile

Replace the python scripts for building the shared lib and tests with a
Makefile, which makes it easier to handle a mix of C and C++.

Makefile

+#!/usr/bin/make -f
+
+BUILD_DIR := build
+OPTIMIZE_FLAGS ?= -g -O3
+TEST_OPTIMIZE_FLAGS ?= -g -O0
+CC = gcc
+TARGET := $(BUILD_DIR)/libolm.so
+
+SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c)
+OBJECTS := $(patsubst src/%,$(BUILD_DIR)/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
+TEST_SOURCES := $(wildcard tests/test_*.cpp) $(wildcard tests/test_*.c)
+TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/%,$(patsubst %.c,%,$(patsubst %.cpp,%,$(TEST_SOURCES))))
+
+CPPFLAGS += -Iinclude -Ilib
+CFLAGS += -Wall --std=c89 -fPIC
+CXXFLAGS += -Wall --std=c++11 -fPIC
+LDFLAGS += -Wall
+
+# generate .d files when compiling
+CPPFLAGS += -MMD
+
+### per-target variables
+
+$(OBJECTS): CFLAGS += $(OPTIMIZE_FLAGS)
+$(OBJECTS): CXXFLAGS += $(OPTIMIZE_FLAGS)
+$(TARGET): LDFLAGS += $(OPTIMIZE_FLAGS)
+
+$(TEST_BINARIES): CPPFLAGS += -Itests/include
+$(TEST_BINARIES): LDLIBS += -lolm
+$(TEST_BINARIES): LDFLAGS += $(TEST_OPTIMIZE_FLAGS) -L$(BUILD_DIR)
+
+### top-level targets
+
+$(TARGET): $(OBJECTS)
+	$(CXX) $(LDFLAGS) --shared -fPIC $^ $(OUTPUT_OPTION)
+
+clean:;
+	rm -rf $(OBJECTS) $(OBJECTS:.o=.d) \
+               $(TEST_BINARIES) $(TEST_BINARIES:=.d) \
+               $(TARGET)
+
+build_tests: $(TEST_BINARIES)
+
+test: build_tests
+	for i in $(TEST_BINARIES); do \
+	    echo $$i; \
+	    LD_LIBRARY_PATH=$(BUILD_DIR) $$i || exit $$?; \
+	done
+
+### rules for building objects
+$(BUILD_DIR)/%.o: src/%.c
+	$(COMPILE.c) $(OUTPUT_OPTION) $<
+
+$(BUILD_DIR)/%.o: src/%.cpp
+	$(COMPILE.cc) $(OUTPUT_OPTION) $<
+
+$(BUILD_DIR)/%: tests/%.c
+	$(LINK.c) $< $(LOADLIBES) $(LDLIBS) -o $@
+
+$(BUILD_DIR)/%: tests/%.cpp
+	$(LINK.cc) $< $(LOADLIBES) $(LDLIBS) -o $@
+
+
+### dependencies
+
+$(TEST_BINARIES): $(TARGET)
+
+-include $(OBJECTS:.o=.d)
+-include $(TEST_BINARIES:=.d)

README.rst

@@ -14,14 +14,13 @@ To build olm as a shared library run:
 
 .. code:: bash
 
-    ./build_shared_library.py
+    make
 
 To run the tests run:
 
 .. code:: bash
 
-   ./test.py
-
+    make test
 
 To build the javascript bindings, install emscripten from http://kripken.github.io/emscripten-site/ and then run:
 
@@ -43,6 +42,11 @@ Design
 Olm is designed to be easy port to different platforms and to be easy
 to write bindings for.
 
+It was originally implemented in C++, with a plain-C layer providing the public
+API. As development has progressed, it has become clear that C++ gives little
+advantage, and new functionality is being added in C, with C++ parts being
+rewritten as the need ariases.
+
 Error Handling
 ~~~~~~~~~~~~~~
 
@@ -78,13 +82,13 @@ the ratchet. While this decreases the performance it makes it much easier
 to compile the library for different architectures.
 
 What's an olm?
-~~~~~~~~~~~~~~
+--------------
 
 It's a really cool species of European troglodytic salamander.
 http://www.postojnska-jama.eu/en/come-and-visit-us/vivarium-proteus/
 
 Legal Notice
-~~~~~~~~~~~~
+------------
 
 The software may be subject to the U.S. export control laws and regulations
 and by downloading the software the user certifies that he/she/it is

build_shared_library.py

-#! /usr/bin/env python
-# Copyright 2015 OpenMarket Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import subprocess
-import glob
-import os
-import sys
-
-if not os.path.exists("build"):
-    os.mkdir("build")
-
-source_files = glob.glob("src/*.cpp")
-
-compile_args = "g++ -Wall -O3 -Iinclude -Ilib --std=c++11 --shared -fPIC".split()
-compile_args += source_files
-compile_args += sys.argv[1:]
-
-library = "build/libolm.so"
-
-def run(args):
-    print " ".join(args)
-    subprocess.check_call(args)
-
-run(compile_args + ["-o", library])

test.py

-#! /usr/bin/env python
-# Copyright 2015 OpenMarket Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import glob
-import os
-import subprocess
-import sys
-
-if not os.path.exists("build/libolm.so"):
-    print >> sys.stderr, \
-        "libolm has not been built. Run ./build_shared_library.py first."
-    exit(1)
-
-test_files = glob.glob("tests/test_*.cpp")
-
-compile_args = ("g++ -g -O0 -Itests/include -Iinclude -Ilib --std=c++11 "+
-                "-L build").split()
-
-def run(args, *xargs, **kwargs):
-    print " ".join(args)
-    subprocess.check_call(args, *xargs, **kwargs)
-
-for test_file in test_files:
-    exe_file = "build/" + test_file[6:-4]
-    run(compile_args + [test_file, "-lolm", "-o", exe_file])
-    run([exe_file], env={'LD_LIBRARY_PATH':'./build'})