diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b328289e..61eb799a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,7 +58,7 @@ IF (MSVC)
 	SET(CMAKE_C_FLAGS_DEBUG "/Od /DEBUG /MTd")
 	SET(CMAKE_C_FLAGS_RELEASE "/MT /O2")
 ELSE ()
-	SET(CMAKE_C_FLAGS "-O2 -g -Wall -Wextra")
+	SET(CMAKE_C_FLAGS "-O2 -g -Wall -Wextra -Wstrict-aliasing=2 -Wstrict-prototypes -Wmissing-prototypes")
 	IF (NOT MINGW) # MinGW always does PIC and complains if we tell it to
 		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
 	ENDIF ()
diff --git a/src/cache.c b/src/cache.c
index cb3a4ecc0..79f3eaea2 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -58,12 +58,12 @@ void git_cache_free(git_cache *cache)
 
 void *git_cache_get(git_cache *cache, const git_oid *oid)
 {
-	const uint32_t *hash;
+	uint32_t hash;
 	cache_node *node = NULL;
 	void *result = NULL;
 
-	hash = (const uint32_t *)oid->id;
-	node = &cache->nodes[hash[0] & cache->size_mask];
+	memcpy(&hash, oid->id, sizeof(hash));
+	node = &cache->nodes[hash & cache->size_mask];
 
 	git_mutex_lock(&node->lock);
 	{
@@ -79,13 +79,13 @@ void *git_cache_get(git_cache *cache, const git_oid *oid)
 
 void *git_cache_try_store(git_cache *cache, void *entry)
 {
-	const uint32_t *hash;
+	uint32_t hash;
 	const git_oid *oid;
 	cache_node *node = NULL;
 
 	oid = &((git_cached_obj*)entry)->oid;
-	hash = (const uint32_t *)oid->id;
-	node = &cache->nodes[hash[0] & cache->size_mask];
+	memcpy(&hash, oid->id, sizeof(hash));
+	node = &cache->nodes[hash & cache->size_mask];
 
 	/* increase the refcount on this object, because
 	 * the cache now owns it */
diff --git a/src/commit.c b/src/commit.c
index 460057e7c..0ee3854c4 100644
--- a/src/commit.c
+++ b/src/commit.c
@@ -169,7 +169,7 @@ cleanup:
 	return error;
 }
 
-int commit_parse_buffer(git_commit *commit, const void *data, size_t len)
+int git_commit__parse_buffer(git_commit *commit, const void *data, size_t len)
 {
 	const char *buffer = data;
 	const char *buffer_end = (const char *)data + len;
@@ -236,7 +236,7 @@ int commit_parse_buffer(git_commit *commit, const void *data, size_t len)
 int git_commit__parse(git_commit *commit, git_odb_object *obj)
 {
 	assert(commit);
-	return commit_parse_buffer(commit, obj->raw.data, obj->raw.len);
+	return git_commit__parse_buffer(commit, obj->raw.data, obj->raw.len);
 }
 
 #define GIT_COMMIT_GETTER(_rvalue, _name, _return) \
diff --git a/src/commit.h b/src/commit.h
index 456aa7914..bfc4bba19 100644
--- a/src/commit.h
+++ b/src/commit.h
@@ -30,4 +30,5 @@ struct git_commit {
 void git_commit__free(git_commit *c);
 int git_commit__parse(git_commit *commit, git_odb_object *obj);
 
+int git_commit__parse_buffer(git_commit *commit, const void *data, size_t len);
 #endif
diff --git a/src/config_file.c b/src/config_file.c
index 3804f97c4..f76efed97 100644
--- a/src/config_file.c
+++ b/src/config_file.c
@@ -553,7 +553,7 @@ static char *cfg_readline(diskfile_backend *cfg)
 /*
  * Consume a line, without storing it anywhere
  */
-void cfg_consume_line(diskfile_backend *cfg)
+static void cfg_consume_line(diskfile_backend *cfg)
 {
 	char *line_start, *line_end;
 
diff --git a/src/mwindow.c b/src/mwindow.c
index 76b80d779..c126fa2bd 100644
--- a/src/mwindow.c
+++ b/src/mwindow.c
@@ -113,7 +113,7 @@ void git_mwindow_scan_lru(
  * Close the least recently used window. You should check to see if
  * the file descriptors need closing from time to time.
  */
-int git_mwindow_close_lru(git_mwindow_file *mwf)
+static int git_mwindow_close_lru(git_mwindow_file *mwf)
 {
 	unsigned int i;
 	git_mwindow *lru_w = NULL, *lru_l = NULL;
diff --git a/src/odb_loose.c b/src/odb_loose.c
index 59703ce95..3ca46d1b5 100644
--- a/src/odb_loose.c
+++ b/src/odb_loose.c
@@ -463,7 +463,7 @@ static int locate_object(char *object_location, loose_backend *backend, const gi
 }
 
 /* Explore an entry of a directory and see if it matches a short oid */
-int fn_locate_object_short_oid(void *state, char *pathbuf) {
+static int fn_locate_object_short_oid(void *state, char *pathbuf) {
 	loose_locate_object_state *sstate = (loose_locate_object_state *)state;
 
 	size_t pathbuf_len = strlen(pathbuf);
@@ -559,7 +559,7 @@ static int locate_object_short_oid(char *object_location, git_oid *res_oid, loos
  *
  ***********************************************************/
 
-int loose_backend__read_header(size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
+static int loose_backend__read_header(size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
 {
 	char object_path[GIT_PATH_MAX];
 	git_rawobj raw;
@@ -581,7 +581,7 @@ int loose_backend__read_header(size_t *len_p, git_otype *type_p, git_odb_backend
 	return GIT_SUCCESS;
 }
 
-int loose_backend__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
+static int loose_backend__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
 {
 	char object_path[GIT_PATH_MAX];
 	git_rawobj raw;
@@ -602,7 +602,7 @@ int loose_backend__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_o
 	return GIT_SUCCESS;
 }
 
-int loose_backend__read_prefix(
+static int loose_backend__read_prefix(
 	git_oid *out_oid,
 	void **buffer_p,
 	size_t *len_p,
@@ -643,7 +643,7 @@ int loose_backend__read_prefix(
 	return GIT_SUCCESS;
 }
 
-int loose_backend__exists(git_odb_backend *backend, const git_oid *oid)
+static int loose_backend__exists(git_odb_backend *backend, const git_oid *oid)
 {
 	char object_path[GIT_PATH_MAX];
 
@@ -652,7 +652,7 @@ int loose_backend__exists(git_odb_backend *backend, const git_oid *oid)
 	return locate_object(object_path, (loose_backend *)backend, oid) == GIT_SUCCESS;
 }
 
-int loose_backend__stream_fwrite(git_oid *oid, git_odb_stream *_stream)
+static int loose_backend__stream_fwrite(git_oid *oid, git_odb_stream *_stream)
 {
 	loose_writestream *stream = (loose_writestream *)_stream;
 	loose_backend *backend = (loose_backend *)_stream->backend;
@@ -673,13 +673,13 @@ int loose_backend__stream_fwrite(git_oid *oid, git_odb_stream *_stream)
 	return git_filebuf_commit_at(&stream->fbuf, final_path);
 }
 
-int loose_backend__stream_write(git_odb_stream *_stream, const char *data, size_t len)
+static int loose_backend__stream_write(git_odb_stream *_stream, const char *data, size_t len)
 {
 	loose_writestream *stream = (loose_writestream *)_stream;
 	return git_filebuf_write(&stream->fbuf, data, len);
 }
 
-void loose_backend__stream_free(git_odb_stream *_stream)
+static void loose_backend__stream_free(git_odb_stream *_stream)
 {
 	loose_writestream *stream = (loose_writestream *)_stream;
 
@@ -702,7 +702,7 @@ static int format_object_header(char *hdr, size_t n, size_t obj_len, git_otype o
 	return len+1;
 }
 
-int loose_backend__stream(git_odb_stream **stream_out, git_odb_backend *_backend, size_t length, git_otype type)
+static int loose_backend__stream(git_odb_stream **stream_out, git_odb_backend *_backend, size_t length, git_otype type)
 {
 	loose_backend *backend;
 	loose_writestream *stream;
@@ -754,7 +754,7 @@ int loose_backend__stream(git_odb_stream **stream_out, git_odb_backend *_backend
 	return GIT_SUCCESS;
 }
 
-int loose_backend__write(git_oid *oid, git_odb_backend *_backend, const void *data, size_t len, git_otype type)
+static int loose_backend__write(git_oid *oid, git_odb_backend *_backend, const void *data, size_t len, git_otype type)
 {
 	int error, header_len;
 	char final_path[GIT_PATH_MAX], header[64];
@@ -797,7 +797,7 @@ cleanup:
 	return error;
 }
 
-void loose_backend__free(git_odb_backend *_backend)
+static void loose_backend__free(git_odb_backend *_backend)
 {
 	loose_backend *backend;
 	assert(_backend);
diff --git a/src/odb_pack.c b/src/odb_pack.c
index 1867ada96..4607fb74a 100644
--- a/src/odb_pack.c
+++ b/src/odb_pack.c
@@ -363,7 +363,7 @@ int pack_backend__read_header(git_rawobj *obj, git_odb_backend *backend, const g
 }
 */
 
-int pack_backend__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
+static int pack_backend__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
 {
 	struct git_pack_entry e;
 	git_rawobj raw;
@@ -382,7 +382,7 @@ int pack_backend__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_od
 	return GIT_SUCCESS;
 }
 
-int pack_backend__read_prefix(
+static int pack_backend__read_prefix(
 	git_oid *out_oid,
 	void **buffer_p,
 	size_t *len_p,
@@ -421,13 +421,13 @@ int pack_backend__read_prefix(
 	return GIT_SUCCESS;
 }
 
-int pack_backend__exists(git_odb_backend *backend, const git_oid *oid)
+static int pack_backend__exists(git_odb_backend *backend, const git_oid *oid)
 {
 	struct git_pack_entry e;
 	return pack_entry_find(&e, (struct pack_backend *)backend, oid) == GIT_SUCCESS;
 }
 
-void pack_backend__free(git_odb_backend *_backend)
+static void pack_backend__free(git_odb_backend *_backend)
 {
 	struct pack_backend *backend;
 	size_t i;
diff --git a/src/refs.c b/src/refs.c
index 7cfbe557f..bc8827b46 100644
--- a/src/refs.c
+++ b/src/refs.c
@@ -1548,7 +1548,7 @@ int git_reference_foreach(git_repository *repo, unsigned int list_flags, int (*c
 	return git_futils_direach(refs_path, GIT_PATH_MAX, _dirent_loose_listall, &data);
 }
 
-int cb__reflist_add(const char *ref, void *data)
+static int cb__reflist_add(const char *ref, void *data)
 {
 	return git_vector_insert((git_vector *)data, git__strdup(ref));
 }
diff --git a/src/remote.c b/src/remote.c
index ad9dedc15..f581b973f 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -216,11 +216,6 @@ int git_remote_download(char **filename, git_remote *remote)
 	return git_fetch_download_pack(filename, remote);
 }
 
-git_headarray *git_remote_tips(git_remote *remote)
-{
-	return &remote->refs;
-}
-
 int git_remote_update_tips(struct git_remote *remote)
 {
 	int error = GIT_SUCCESS;
diff --git a/src/repository.c b/src/repository.c
index 15ee67fa4..bb7ef396d 100644
--- a/src/repository.c
+++ b/src/repository.c
@@ -156,7 +156,7 @@ static int quickcheck_repository_dir(const char *repository_path)
 	return GIT_SUCCESS;
 }
 
-static git_repository *repository_alloc()
+static git_repository *repository_alloc(void)
 {
 	int error;
 
diff --git a/src/revwalk.c b/src/revwalk.c
index 768e11089..72eb69aba 100644
--- a/src/revwalk.c
+++ b/src/revwalk.c
@@ -52,7 +52,7 @@ struct git_revwalk {
 	unsigned int sorting;
 };
 
-commit_list *commit_list_insert(commit_object *item, commit_list **list_p)
+static commit_list *commit_list_insert(commit_object *item, commit_list **list_p)
 {
 	commit_list *new_list = git__malloc(sizeof(commit_list));
 	new_list->item = item;
@@ -61,7 +61,7 @@ commit_list *commit_list_insert(commit_object *item, commit_list **list_p)
 	return new_list;
 }
 
-void commit_list_free(commit_list **list_p)
+static void commit_list_free(commit_list **list_p)
 {
 	commit_list *list = *list_p;
 
@@ -74,7 +74,7 @@ void commit_list_free(commit_list **list_p)
 	*list_p = NULL;
 }
 
-commit_object *commit_list_pop(commit_list **stack)
+static commit_object *commit_list_pop(commit_list **stack)
 {
 	commit_list *top = *stack;
 	commit_object *item = top ? top->item : NULL;
diff --git a/src/signature.c b/src/signature.c
index 09915f89e..7cc3733bc 100644
--- a/src/signature.c
+++ b/src/signature.c
@@ -203,7 +203,7 @@ static int parse_timezone_offset(const char *buffer, int *offset_out)
 	return GIT_SUCCESS;
 }
 
-int process_next_token(const char **buffer_out, char **storage,
+static int process_next_token(const char **buffer_out, char **storage,
 	const char *token_end, const char *right_boundary)
 {
 	int error = process_trimming(*buffer_out, storage, token_end, 0);
@@ -218,7 +218,7 @@ int process_next_token(const char **buffer_out, char **storage,
 	return GIT_SUCCESS;
 }
 
-const char *scan_for_previous_token(const char *buffer, const char *left_boundary)
+static const char *scan_for_previous_token(const char *buffer, const char *left_boundary)
 {
 	const char *start;
 
@@ -234,7 +234,7 @@ const char *scan_for_previous_token(const char *buffer, const char *left_boundar
 	return start;
 }
 
-int parse_time(git_time_t *time_out, const char *buffer)
+static int parse_time(git_time_t *time_out, const char *buffer)
 {
 	long time;
 	int error;
diff --git a/src/tree.c b/src/tree.c
index bccc91136..ce399a66a 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -24,7 +24,7 @@ struct tree_key_search {
 	size_t filename_len;
 };
 
-int entry_search_cmp(const void *key, const void *array_member)
+static int entry_search_cmp(const void *key, const void *array_member)
 {
 	const struct tree_key_search *ksearch = key;
 	const git_tree_entry *entry = array_member;
@@ -37,7 +37,7 @@ int entry_search_cmp(const void *key, const void *array_member)
 	return result ? result : ((int)ksearch->filename_len - (int)entry->filename_len);
 }
 
-int entry_sort_cmp(const void *a, const void *b)
+static int entry_sort_cmp(const void *a, const void *b)
 {
 	const git_tree_entry *entry_a = (const git_tree_entry *)(a);
 	const git_tree_entry *entry_b = (const git_tree_entry *)(b);
@@ -157,6 +157,7 @@ static int tree_parse_buffer(git_tree *tree, const char *buffer, const char *buf
 
 	while (buffer < buffer_end) {
 		git_tree_entry *entry;
+		long tmp;
 
 		entry = git__calloc(1, sizeof(git_tree_entry));
 		if (entry == NULL) {
@@ -167,8 +168,10 @@ static int tree_parse_buffer(git_tree *tree, const char *buffer, const char *buf
 		if (git_vector_insert(&tree->entries, entry) < GIT_SUCCESS)
 			return GIT_ENOMEM;
 
-		if (git__strtol32((long *)&entry->attr, buffer, &buffer, 8) < GIT_SUCCESS)
+		if (git__strtol32(&tmp, buffer, &buffer, 8) < GIT_SUCCESS ||
+			!buffer || tmp > UINT_MAX || tmp < 0)
 			return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tree. Can't parse attributes");
+		entry->attr = tmp;
 
 		if (*buffer++ != ' ') {
 			error = git__throw(GIT_EOBJCORRUPTED, "Failed to parse tree. Object it corrupted");
diff --git a/tests/t00-core.c b/tests/t00-core.c
index 6d63d1ce1..5d1a7ac7c 100644
--- a/tests/t00-core.c
+++ b/tests/t00-core.c
@@ -506,7 +506,7 @@ END_TEST
 
 static char *empty_tmp_dir = "test_gitfo_rmdir_recurs_test";
 
-static int setup_empty_tmp_dir()
+static int setup_empty_tmp_dir(void)
 {
 	char path[GIT_PATH_MAX];
 
diff --git a/tests/t04-commit.c b/tests/t04-commit.c
index a8617ed6a..88c7efd81 100644
--- a/tests/t04-commit.c
+++ b/tests/t04-commit.c
@@ -498,9 +498,6 @@ BEGIN_TEST(signature4, "creating a zero character signature")
 END_TEST
 
 
-/* External declaration for testing the buffer parsing method */
-int commit_parse_buffer(git_commit *commit, void *data, size_t len);
-
 BEGIN_TEST(parse2, "parse a whole commit buffer")
 	const int broken_commit_count = sizeof(test_commits_broken) / sizeof(*test_commits_broken);
 	const int working_commit_count = sizeof(test_commits_working) / sizeof(*test_commits_working);
@@ -516,7 +513,7 @@ BEGIN_TEST(parse2, "parse a whole commit buffer")
 		memset(commit, 0x0, sizeof(git_commit));
 		commit->object.repo = repo;
 
-		must_fail(commit_parse_buffer(
+		must_fail(git_commit__parse_buffer(
 					commit,
 					test_commits_broken[i],
 					strlen(test_commits_broken[i]))
@@ -532,7 +529,7 @@ BEGIN_TEST(parse2, "parse a whole commit buffer")
 		memset(commit, 0x0, sizeof(git_commit));
 		commit->object.repo = repo;
 
-		must_pass(commit_parse_buffer(
+		must_pass(git_commit__parse_buffer(
 					commit,
 					test_commits_working[i],
 					strlen(test_commits_working[i]))
@@ -544,7 +541,7 @@ BEGIN_TEST(parse2, "parse a whole commit buffer")
 		memset(commit, 0x0, sizeof(git_commit));
 		commit->object.repo = repo;
 
-		must_pass(commit_parse_buffer(
+		must_pass(git_commit__parse_buffer(
 					commit,
 					test_commits_working[i],
 					strlen(test_commits_working[i]))
diff --git a/tests/t07-hashtable.c b/tests/t07-hashtable.c
index 7313f2cc9..c0e852259 100644
--- a/tests/t07-hashtable.c
+++ b/tests/t07-hashtable.c
@@ -34,7 +34,7 @@ typedef struct _aux_object {
 	int visited;
 } table_item;
 
-uint32_t hash_func(const void *key, int hash_id)
+static uint32_t hash_func(const void *key, int hash_id)
 {
 	uint32_t r;
 	const git_oid *id = key;
@@ -43,7 +43,7 @@ uint32_t hash_func(const void *key, int hash_id)
 	return r;
 }
 
-int hash_cmpkey(const void *a, const void *b)
+static int hash_cmpkey(const void *a, const void *b)
 {
 	return git_oid_cmp(a, b);
 }
diff --git a/tests/t12-repo.c b/tests/t12-repo.c
index 1d9132cfd..de921f9ca 100644
--- a/tests/t12-repo.c
+++ b/tests/t12-repo.c
@@ -34,7 +34,7 @@ typedef struct {
 	int position;
 } fake_backend;
 
-git_odb_backend *new_backend(int position)
+static git_odb_backend *new_backend(int position)
 {
 	fake_backend *b;
 
@@ -47,7 +47,7 @@ git_odb_backend *new_backend(int position)
 	return (git_odb_backend *)b;
 }
 
-int test_backend_sorting(git_odb *odb)
+static int test_backend_sorting(git_odb *odb)
 {
 	unsigned int i;
 
diff --git a/tests/test_lib.h b/tests/test_lib.h
index fc75ed771..9d90e4847 100755
--- a/tests/test_lib.h
+++ b/tests/test_lib.h
@@ -13,6 +13,7 @@
 #define SUITE_NAME(SNAME) libgit2_suite_##SNAME
 
 #define BEGIN_SUITE(SNAME) \
+	git_testsuite *libgit2_suite_##SNAME(void);\
 	git_testsuite *libgit2_suite_##SNAME(void) {\
 		git_testsuite *_gitsuite = git_testsuite_new(#SNAME);