Clean up annoying warnings

The indexer code was generating warnings on Windows 64-bit.  I
looked closely at the logic and was able to simplify it a bit.

Also this fixes some other Windows and Linux warnings.

src/indexer.c

@@ -50,7 +50,7 @@ struct git_indexer_stream {
 
 	/* Fields for calculating the packfile trailer (hash of everything before it) */
 	char inbuf[GIT_OID_RAWSZ];
-	int inbuf_len;
+	size_t inbuf_len;
 	git_hash_ctx trailer;
 };
 
@@ -378,13 +378,13 @@ static int do_progress_callback(git_indexer_stream *idx, git_transfer_progress *
 /* Hash everything but the last 20B of input */
 static void hash_partially(git_indexer_stream *idx, const uint8_t *data, size_t size)
 {
-	int to_expell, to_keep;
+	size_t to_expell, to_keep;
 
 	if (size == 0)
 		return;
 
 	/* Easy case, dump the buffer and the data minus the last 20 bytes */
-	if (size >= 20) {
+	if (size >= GIT_OID_RAWSZ) {
 		git_hash_update(&idx->trailer, idx->inbuf, idx->inbuf_len);
 		git_hash_update(&idx->trailer, data, size - GIT_OID_RAWSZ);
 
@@ -402,8 +402,8 @@ static void hash_partially(git_indexer_stream *idx, const uint8_t *data, size_t
 	}
 
 	/* We need to partially drain the buffer and then append */
-	to_expell = abs(size - (GIT_OID_RAWSZ - idx->inbuf_len));
-	to_keep = abs(idx->inbuf_len - to_expell);
+	to_keep   = GIT_OID_RAWSZ - size;
+	to_expell = idx->inbuf_len - to_keep;
 
 	git_hash_update(&idx->trailer, idx->inbuf, to_expell);
 

src/repository.c

@@ -890,6 +890,8 @@ static bool are_symlinks_supported(const char *wd_path)
 	return symlinks_supported;
 }
 
+#ifdef GIT_USE_ICONV
+
 static const char *nfc_file = "\xC3\x85\x73\x74\x72\xC3\xB6\x6D.XXXXXX";
 static const char *nfd_file = "\x41\xCC\x8A\x73\x74\x72\x6F\xCC\x88\x6D.XXXXXX";
 
@@ -938,6 +940,8 @@ fail:
 	return need_precompose;
 }
 
+#endif
+
 static int create_empty_file(const char *path, mode_t mode)
 {
 	int fd;
@@ -994,7 +998,7 @@ static int repo_init_config(
 	SET_REPO_CONFIG(
 		bool, "core.filemode", is_chmod_supported(git_buf_cstr(&cfg_path)));
 
-#if __APPLE__
+#ifdef GIT_USE_ICONV
 	SET_REPO_CONFIG(
 		bool, "core.precomposeunicode",
 		should_precompose_unicode_paths(is_bare ? repo_dir : work_dir));

tests-clar/core/iconv.c

@@ -21,6 +21,7 @@ void test_core_iconv__unchanged(void)
 	size_t datalen = strlen(data);
 
 	cl_git_pass(git_path_iconv(&ic, &data, &datalen));
+	GIT_UNUSED(datalen);
 
 	/* There are no high bits set, so this should leave data untouched */
 	cl_assert(data == original);
@@ -32,6 +33,7 @@ void test_core_iconv__decomposed_to_precomposed(void)
 	size_t datalen = strlen(nfd);
 
 	cl_git_pass(git_path_iconv(&ic, &data, &datalen));
+	GIT_UNUSED(datalen);
 
 	/* The decomposed nfd string should be transformed to the nfc form
 	 * (on platforms where iconv is enabled, of course).
@@ -49,6 +51,7 @@ void test_core_iconv__precomposed_is_unmodified(void)
 	size_t datalen = strlen(nfc);
 
 	cl_git_pass(git_path_iconv(&ic, &data, &datalen));
+	GIT_UNUSED(datalen);
 
 	/* data is already in precomposed form, so even though some bytes have
 	 * the high-bit set, the iconv transform should result in no change.