Fix warning about functions defined but not used [-Wunused-function]

Fixes the following GCC 5 warnings:
```
core/io/zip_io.h:128:26: warning: 'zlib_filefunc_def zipio_create_io_from_file(FileAccess**)' defined but not used [-Wunused-function]
core/script_debugger_remote.cpp:110:17: warning: 'ObjectID safe_get_instance_id(const Variant&)' defined but not used [-Wunused-function]
drivers/unix/socket_helpers.h:103:12: warning: 'int _socket_create(IP::Type&, int, int)' defined but not used [-Wunused-function]
drivers/unix/socket_helpers.h:45:15: warning: 'size_t _set_sockaddr(sockaddr_storage*, const IP_Address&, int, IP::Type)' defined but not used [-Wunused-function]
drivers/unix/socket_helpers.h:76:15: warning: 'size_t _set_listen_sockaddr(sockaddr_storage*, int, IP::Type, IP_Address)' defined but not used [-Wunused-function]
editor/editor_fonts.cpp:40:24: warning: 'Ref<BitmapFont> make_font(int, int, int, int, const int*, const Ref<Texture>&)' defined but not used [-Wunused-function]
editor/editor_themes.cpp:85:26: warning: 'Ref<StyleBoxFlat> change_border_color(Ref<StyleBoxFlat>, Color)' defined but not used [-Wunused-function]
editor/import/editor_import_collada.cpp:493:13: warning: 'void _generate_normals(const PoolVector<int>&, const PoolVector<Vector3>&, PoolVector<Vector3>&)' defined but not used [-Wunused-function]
editor/import/editor_import_collada.cpp:524:13: warning: 'void _generate_tangents_and_binormals(const PoolVector<int>&, const PoolVector<Vector3>&, const PoolVector<Vector3>&, const PoolVector<Vector3>&, PoolVector<float>&)' defined but not used [-Wunused-function]
editor/pvrtc_compress.cpp:118:13: warning: 'void _compress_etc(Image*)' defined but not used [-Wunused-function]
modules/etc/image_etc.cpp:89:13: warning: 'void _decompress_etc1(Image*)' defined but not used [-Wunused-function]
modules/etc/image_etc.cpp:93:13: warning: 'void _decompress_etc2(Image*)' defined but not used [-Wunused-function]
modules/gdscript/editor/gdscript_highlighter.cpp:46:13: warning: 'bool _is_whitespace(CharType)' defined but not used [-Wunused-function]
scene/2d/cpu_particles_2d.cpp:510:14: warning: 'float rand_from_seed_m1_p1(uint32_t&)' defined but not used [-Wunused-function]
scene/3d/cpu_particles.cpp:474:14: warning: 'float rand_from_seed_m1_p1(uint32_t&)' defined but not used [-Wunused-function]
scene/resources/default_theme/default_theme.cpp:123:20: warning: 'Ref<Shader> make_shader(const char*, const char*, const char*)' defined but not used [-Wunused-function]
scene/resources/default_theme/default_theme.cpp:130:24: warning: 'Ref<BitmapFont> make_font(int, int, int, int, const int*, const Ref<Texture>&)' defined but not used [-Wunused-function]
```

Had to split `core/io/zip_io.h` into header and .cpp file without 'static' keyword.

Not fixed yet (static definition in header used in some files but not all):
```
modules/websocket/lws_helper.h:111:13: warning: 'void _lws_make_protocols(void*, int (*)(lws*, lws_callback_reasons, void*, void*, size_t), PoolVector<String>, _LWSRef**)' defined but not used [-Wunused-function]
```

Also fixed a couple other warnings missed in previous commits.

21 files changed, 165 insertions, 364 deletions

diff --git a/core/io/zip_io.cpp b/core/io/zip_io.cpp
new file mode 100644
index 0000000000..b7f841b66f
--- /dev/null
+++ b/core/io/zip_io.cpp
@@ -0,0 +1,137 @@
+/*************************************************************************/
+/*  zip_io.cpp                                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "zip_io.h"
+
+#include "core/os/copymem.h"
+
+void *zipio_open(void *data, const char *p_fname, int mode) {
+
+	FileAccess *&f = *(FileAccess **)data;
+
+	String fname;
+	fname.parse_utf8(p_fname);
+
+	if (mode & ZLIB_FILEFUNC_MODE_WRITE) {
+		f = FileAccess::open(fname, FileAccess::WRITE);
+	} else {
+
+		f = FileAccess::open(fname, FileAccess::READ);
+	}
+
+	if (!f)
+		return NULL;
+
+	return data;
+}
+
+uLong zipio_read(void *data, void *fdata, void *buf, uLong size) {
+
+	FileAccess *f = *(FileAccess **)data;
+	return f->get_buffer((uint8_t *)buf, size);
+}
+
+uLong zipio_write(voidpf opaque, voidpf stream, const void *buf, uLong size) {
+
+	FileAccess *f = *(FileAccess **)opaque;
+	f->store_buffer((uint8_t *)buf, size);
+	return size;
+}
+
+long zipio_tell(voidpf opaque, voidpf stream) {
+
+	FileAccess *f = *(FileAccess **)opaque;
+	return f->get_position();
+}
+
+long zipio_seek(voidpf opaque, voidpf stream, uLong offset, int origin) {
+
+	FileAccess *f = *(FileAccess **)opaque;
+
+	int pos = offset;
+	switch (origin) {
+
+		case ZLIB_FILEFUNC_SEEK_CUR:
+			pos = f->get_position() + offset;
+			break;
+		case ZLIB_FILEFUNC_SEEK_END:
+			pos = f->get_len() + offset;
+			break;
+		default:
+			break;
+	};
+
+	f->seek(pos);
+	return 0;
+}
+
+int zipio_close(voidpf opaque, voidpf stream) {
+
+	FileAccess *&f = *(FileAccess **)opaque;
+	if (f) {
+		f->close();
+		f = NULL;
+	}
+	return 0;
+}
+
+int zipio_testerror(voidpf opaque, voidpf stream) {
+
+	FileAccess *f = *(FileAccess **)opaque;
+	return (f && f->get_error() != OK) ? 1 : 0;
+}
+
+voidpf zipio_alloc(voidpf opaque, uInt items, uInt size) {
+
+	voidpf ptr = memalloc(items * size);
+	zeromem(ptr, items * size);
+	return ptr;
+}
+
+void zipio_free(voidpf opaque, voidpf address) {
+
+	memfree(address);
+}
+
+zlib_filefunc_def zipio_create_io_from_file(FileAccess **p_file) {
+
+	zlib_filefunc_def io;
+	io.opaque = p_file;
+	io.zopen_file = zipio_open;
+	io.zread_file = zipio_read;
+	io.zwrite_file = zipio_write;
+	io.ztell_file = zipio_tell;
+	io.zseek_file = zipio_seek;
+	io.zclose_file = zipio_close;
+	io.zerror_file = zipio_testerror;
+	io.alloc_mem = zipio_alloc;
+	io.free_mem = zipio_free;
+	return io;
+}
diff --git a/core/io/zip_io.h b/core/io/zip_io.h
index c3314a8990..bba7d67332 100644
--- a/core/io/zip_io.h
+++ b/core/io/zip_io.h
@@ -31,114 +31,28 @@
 #ifndef ZIP_IO_H
 #define ZIP_IO_H
 
-#include "core/os/copymem.h"
 #include "core/os/file_access.h"
 
+// Not direclty used in this header, but assumed available in downstream users
+// like platform/*/export/export.cpp. Could be fixed, but probably better to have
+// thirdparty includes in as little headers as possible.
 #include "thirdparty/minizip/unzip.h"
 #include "thirdparty/minizip/zip.h"
 
-static void *zipio_open(void *data, const char *p_fname, int mode) {
+void *zipio_open(void *data, const char *p_fname, int mode);
+uLong zipio_read(void *data, void *fdata, void *buf, uLong size);
+uLong zipio_write(voidpf opaque, voidpf stream, const void *buf, uLong size);
 
-	FileAccess *&f = *(FileAccess **)data;
+long zipio_tell(voidpf opaque, voidpf stream);
+long zipio_seek(voidpf opaque, voidpf stream, uLong offset, int origin);
 
-	String fname;
-	fname.parse_utf8(p_fname);
+int zipio_close(voidpf opaque, voidpf stream);
 
-	if (mode & ZLIB_FILEFUNC_MODE_WRITE) {
-		f = FileAccess::open(fname, FileAccess::WRITE);
-	} else {
+int zipio_testerror(voidpf opaque, voidpf stream);
 
-		f = FileAccess::open(fname, FileAccess::READ);
-	}
+voidpf zipio_alloc(voidpf opaque, uInt items, uInt size);
+void zipio_free(voidpf opaque, voidpf address);
 
-	if (!f)
-		return NULL;
-
-	return data;
-};
-
-static uLong zipio_read(void *data, void *fdata, void *buf, uLong size) {
-
-	FileAccess *f = *(FileAccess **)data;
-	return f->get_buffer((uint8_t *)buf, size);
-};
-
-static uLong zipio_write(voidpf opaque, voidpf stream, const void *buf, uLong size) {
-
-	FileAccess *f = *(FileAccess **)opaque;
-	f->store_buffer((uint8_t *)buf, size);
-	return size;
-};
-
-static long zipio_tell(voidpf opaque, voidpf stream) {
-
-	FileAccess *f = *(FileAccess **)opaque;
-	return f->get_position();
-};
-
-static long zipio_seek(voidpf opaque, voidpf stream, uLong offset, int origin) {
-
-	FileAccess *f = *(FileAccess **)opaque;
-
-	int pos = offset;
-	switch (origin) {
-
-		case ZLIB_FILEFUNC_SEEK_CUR:
-			pos = f->get_position() + offset;
-			break;
-		case ZLIB_FILEFUNC_SEEK_END:
-			pos = f->get_len() + offset;
-			break;
-		default:
-			break;
-	};
-
-	f->seek(pos);
-	return 0;
-};
-
-static int zipio_close(voidpf opaque, voidpf stream) {
-
-	FileAccess *&f = *(FileAccess **)opaque;
-	if (f) {
-		f->close();
-		f = NULL;
-	}
-	return 0;
-};
-
-static int zipio_testerror(voidpf opaque, voidpf stream) {
-
-	FileAccess *f = *(FileAccess **)opaque;
-	return (f && f->get_error() != OK) ? 1 : 0;
-};
-
-static voidpf zipio_alloc(voidpf opaque, uInt items, uInt size) {
-
-	voidpf ptr = memalloc(items * size);
-	zeromem(ptr, items * size);
-	return ptr;
-}
-
-static void zipio_free(voidpf opaque, voidpf address) {
-
-	memfree(address);
-}
-
-static zlib_filefunc_def zipio_create_io_from_file(FileAccess **p_file) {
-
-	zlib_filefunc_def io;
-	io.opaque = p_file;
-	io.zopen_file = zipio_open;
-	io.zread_file = zipio_read;
-	io.zwrite_file = zipio_write;
-	io.ztell_file = zipio_tell;
-	io.zseek_file = zipio_seek;
-	io.zclose_file = zipio_close;
-	io.zerror_file = zipio_testerror;
-	io.alloc_mem = zipio_alloc;
-	io.free_mem = zipio_free;
-	return io;
-}
+zlib_filefunc_def zipio_create_io_from_file(FileAccess **p_file);
 
 #endif // ZIP_IO_H
diff --git a/core/script_debugger_remote.cpp b/core/script_debugger_remote.cpp
index 00a86d11bd..388e3b77a3 100644
--- a/core/script_debugger_remote.cpp
+++ b/core/script_debugger_remote.cpp
@@ -98,36 +98,6 @@ Error ScriptDebuggerRemote::connect_to_host(const String &p_host, uint16_t p_por
 	return OK;
 }
 
-static int _ScriptDebuggerRemote_found_id = 0;
-static Object *_ScriptDebuggerRemote_find = NULL;
-static void _ScriptDebuggerRemote_debug_func(Object *p_obj) {
-
-	if (_ScriptDebuggerRemote_find == p_obj) {
-		_ScriptDebuggerRemote_found_id = p_obj->get_instance_id();
-	}
-}
-
-static ObjectID safe_get_instance_id(const Variant &p_v) {
-
-	Object *o = p_v;
-	if (o == NULL)
-		return 0;
-	else {
-
-		REF r = p_v;
-		if (r.is_valid()) {
-
-			return r->get_instance_id();
-		} else {
-
-			_ScriptDebuggerRemote_found_id = 0;
-			_ScriptDebuggerRemote_find = NULL;
-			ObjectDB::debug_objects(_ScriptDebuggerRemote_debug_func);
-			return _ScriptDebuggerRemote_found_id;
-		}
-	}
-}
-
 void ScriptDebuggerRemote::_put_variable(const String &p_name, const Variant &p_variable) {
 
 	packet_peer_stream->put_var(p_name);
diff --git a/editor/editor_fonts.cpp b/editor/editor_fonts.cpp
index ea99c882e4..8b1818b595 100644
--- a/editor/editor_fonts.cpp
+++ b/editor/editor_fonts.cpp
@@ -37,33 +37,6 @@
 #include "scene/resources/default_theme/default_theme.h"
 #include "scene/resources/dynamic_font.h"
 
-static Ref<BitmapFont> make_font(int p_height, int p_ascent, int p_valign, int p_charcount, const int *p_chars, const Ref<Texture> &p_texture) {
-
-	Ref<BitmapFont> font(memnew(BitmapFont));
-	font->add_texture(p_texture);
-
-	for (int i = 0; i < p_charcount; i++) {
-
-		const int *c = &p_chars[i * 8];
-
-		int chr = c[0];
-		Rect2 frect;
-		frect.position.x = c[1];
-		frect.position.y = c[2];
-		frect.size.x = c[3];
-		frect.size.y = c[4];
-		Point2 align(c[5], c[6] + p_valign);
-		int advance = c[7];
-
-		font->add_char(chr, 0, frect, align, advance);
-	}
-
-	font->set_height(p_height);
-	font->set_ascent(p_ascent);
-
-	return font;
-}
-
 #define MAKE_FALLBACKS(m_name)          \
 	m_name->add_fallback(FontArabic);   \
 	m_name->add_fallback(FontHebrew);   \
diff --git a/editor/editor_node.cpp b/editor/editor_node.cpp
index 330173a8c3..c9871bf27d 100644
--- a/editor/editor_node.cpp
+++ b/editor/editor_node.cpp
@@ -36,7 +36,6 @@
 #include "core/io/resource_loader.h"
 #include "core/io/resource_saver.h"
 #include "core/io/stream_peer_ssl.h"
-#include "core/io/zip_io.h"
 #include "core/message_queue.h"
 #include "core/os/file_access.h"
 #include "core/os/input.h"
diff --git a/editor/editor_themes.cpp b/editor/editor_themes.cpp
index 8575d7be96..39d2f685b6 100644
--- a/editor/editor_themes.cpp
+++ b/editor/editor_themes.cpp
@@ -81,12 +81,6 @@ static Ref<StyleBoxLine> make_line_stylebox(Color p_color, int p_thickness = 1,
 	return style;
 }
 
-static Ref<StyleBoxFlat> change_border_color(Ref<StyleBoxFlat> p_style, Color p_color) {
-	Ref<StyleBoxFlat> style = p_style->duplicate();
-	style->set_border_color_all(p_color);
-	return style;
-}
-
 Ref<ImageTexture> editor_generate_icon(int p_index, bool p_convert_color, float p_scale = EDSCALE, bool p_force_filter = false) {
 
 	Ref<ImageTexture> icon = memnew(ImageTexture);
diff --git a/editor/import/editor_import_collada.cpp b/editor/import/editor_import_collada.cpp
index 31c1886d32..60ca66e464 100644
--- a/editor/import/editor_import_collada.cpp
+++ b/editor/import/editor_import_collada.cpp
@@ -490,120 +490,6 @@ Error ColladaImport::_create_material(const String &p_target) {
 	return OK;
 }
 
-static void _generate_normals(const PoolVector<int> &p_indices, const PoolVector<Vector3> &p_vertices, PoolVector<Vector3> &r_normals) {
-
-	r_normals.resize(p_vertices.size());
-	PoolVector<Vector3>::Write narrayw = r_normals.write();
-
-	int iacount = p_indices.size() / 3;
-	PoolVector<int>::Read index_arrayr = p_indices.read();
-	PoolVector<Vector3>::Read vertex_arrayr = p_vertices.read();
-
-	for (int idx = 0; idx < iacount; idx++) {
-
-		Vector3 v[3] = {
-			vertex_arrayr[index_arrayr[idx * 3 + 0]],
-			vertex_arrayr[index_arrayr[idx * 3 + 1]],
-			vertex_arrayr[index_arrayr[idx * 3 + 2]]
-		};
-
-		Vector3 normal = Plane(v[0], v[1], v[2]).normal;
-
-		narrayw[index_arrayr[idx * 3 + 0]] += normal;
-		narrayw[index_arrayr[idx * 3 + 1]] += normal;
-		narrayw[index_arrayr[idx * 3 + 2]] += normal;
-	}
-
-	int vlen = p_vertices.size();
-
-	for (int idx = 0; idx < vlen; idx++) {
-		narrayw[idx].normalize();
-	}
-}
-
-static void _generate_tangents_and_binormals(const PoolVector<int> &p_indices, const PoolVector<Vector3> &p_vertices, const PoolVector<Vector3> &p_uvs, const PoolVector<Vector3> &p_normals, PoolVector<real_t> &r_tangents) {
-
-	int vlen = p_vertices.size();
-
-	Vector<Vector3> tangents;
-	tangents.resize(vlen);
-	Vector<Vector3> binormals;
-	binormals.resize(vlen);
-
-	int iacount = p_indices.size() / 3;
-
-	PoolVector<int>::Read index_arrayr = p_indices.read();
-	PoolVector<Vector3>::Read vertex_arrayr = p_vertices.read();
-	PoolVector<Vector3>::Read narrayr = p_normals.read();
-	PoolVector<Vector3>::Read uvarrayr = p_uvs.read();
-
-	for (int idx = 0; idx < iacount; idx++) {
-
-		Vector3 v1 = vertex_arrayr[index_arrayr[idx * 3 + 0]];
-		Vector3 v2 = vertex_arrayr[index_arrayr[idx * 3 + 1]];
-		Vector3 v3 = vertex_arrayr[index_arrayr[idx * 3 + 2]];
-
-		Vector3 w1 = uvarrayr[index_arrayr[idx * 3 + 0]];
-		Vector3 w2 = uvarrayr[index_arrayr[idx * 3 + 1]];
-		Vector3 w3 = uvarrayr[index_arrayr[idx * 3 + 2]];
-
-		real_t x1 = v2.x - v1.x;
-		real_t x2 = v3.x - v1.x;
-		real_t y1 = v2.y - v1.y;
-		real_t y2 = v3.y - v1.y;
-		real_t z1 = v2.z - v1.z;
-		real_t z2 = v3.z - v1.z;
-
-		real_t s1 = w2.x - w1.x;
-		real_t s2 = w3.x - w1.x;
-		real_t t1 = w2.y - w1.y;
-		real_t t2 = w3.y - w1.y;
-
-		real_t r = (s1 * t2 - s2 * t1);
-
-		Vector3 tangent;
-		Vector3 binormal;
-
-		if (r == 0) {
-
-			binormal = Vector3();
-			tangent = Vector3();
-		} else {
-			tangent = Vector3((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r,
-					(t2 * z1 - t1 * z2) * r)
-							  .normalized();
-			binormal = Vector3((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r,
-					(s1 * z2 - s2 * z1) * r)
-							   .normalized();
-		}
-
-		tangents.write[index_arrayr[idx * 3 + 0]] += tangent;
-		binormals.write[index_arrayr[idx * 3 + 0]] += binormal;
-		tangents.write[index_arrayr[idx * 3 + 1]] += tangent;
-		binormals.write[index_arrayr[idx * 3 + 1]] += binormal;
-		tangents.write[index_arrayr[idx * 3 + 2]] += tangent;
-		binormals.write[index_arrayr[idx * 3 + 2]] += binormal;
-	}
-
-	r_tangents.resize(vlen * 4);
-	PoolVector<real_t>::Write tarrayw = r_tangents.write();
-
-	for (int idx = 0; idx < vlen; idx++) {
-		Vector3 tangent = tangents[idx];
-		Vector3 bingen = narrayr[idx].cross(tangent);
-		float dir;
-		if (bingen.dot(binormals[idx]) < 0)
-			dir = -1.0;
-		else
-			dir = +1.0;
-
-		tarrayw[idx * 4 + 0] = tangent.x;
-		tarrayw[idx * 4 + 1] = tangent.y;
-		tarrayw[idx * 4 + 2] = tangent.z;
-		tarrayw[idx * 4 + 3] = dir;
-	}
-}
-
 Error ColladaImport::_create_mesh_surfaces(bool p_optimize, Ref<ArrayMesh> &p_mesh, const Map<String, Collada::NodeGeometry::Material> &p_material_map, const Collada::MeshData &meshdata, const Transform &p_local_xform, const Vector<int> &bone_remap, const Collada::SkinControllerData *p_skin_controller, const Collada::MorphControllerData *p_morph_data, Vector<Ref<ArrayMesh> > p_morph_meshes, bool p_use_compression, bool p_use_mesh_material) {
 
 	bool local_xform_mirror = p_local_xform.basis.determinant() < 0;
diff --git a/editor/plugins/shader_editor_plugin.cpp b/editor/plugins/shader_editor_plugin.cpp
index 775fca308e..17f93b55a1 100644
--- a/editor/plugins/shader_editor_plugin.cpp
+++ b/editor/plugins/shader_editor_plugin.cpp
@@ -448,7 +448,6 @@ void ShaderEditor::_text_edit_gui_input(const Ref<InputEvent> &ev) {
 			int col, row;
 			TextEdit *tx = shader_editor->get_text_edit();
 			tx->_get_mouse_pos(mb->get_global_position() - tx->get_global_position(), row, col);
-			Vector2 mpos = mb->get_global_position() - tx->get_global_position();
 			tx->set_right_click_moves_caret(EditorSettings::get_singleton()->get("text_editor/cursor/right_click_moves_caret"));
 
 			if (tx->is_right_click_moving_caret()) {
diff --git a/editor/pvrtc_compress.cpp b/editor/pvrtc_compress.cpp
index b1c847570c..30e78aa32b 100644
--- a/editor/pvrtc_compress.cpp
+++ b/editor/pvrtc_compress.cpp
@@ -115,11 +115,6 @@ static void _compress_pvrtc4(Image *p_image) {
 	_compress_image(Image::COMPRESS_PVRTC4, p_image);
 }
 
-static void _compress_etc(Image *p_image) {
-
-	_compress_image(Image::COMPRESS_ETC, p_image);
-}
-
 void _pvrtc_register_compressors() {
 
 	_base_image_compress_pvrtc2_func = Image::_image_compress_pvrtc2_func;
@@ -127,5 +122,4 @@ void _pvrtc_register_compressors() {
 
 	Image::_image_compress_pvrtc2_func = _compress_pvrtc2;
 	Image::_image_compress_pvrtc4_func = _compress_pvrtc4;
-	//Image::_image_compress_etc_func=_compress_etc; //use the built in one for ETC
 }
diff --git a/modules/etc/image_etc.cpp b/modules/etc/image_etc.cpp
index 57f5b68c61..fbbc765bf2 100644
--- a/modules/etc/image_etc.cpp
+++ b/modules/etc/image_etc.cpp
@@ -88,14 +88,6 @@ static Etc::Image::Format _image_format_to_etc2comp_format(Image::Format format)
 	}
 }
 
-static void _decompress_etc1(Image *p_img) {
-	// not implemented, to be removed
-}
-
-static void _decompress_etc2(Image *p_img) {
-	// not implemented, to be removed
-}
-
 static void _compress_etc(Image *p_img, float p_lossy_quality, bool force_etc1_format, Image::CompressSource p_source) {
 	Image::Format img_format = p_img->get_format();
 	Image::DetectChannels detected_channels = p_img->get_detected_channels();
@@ -245,8 +237,5 @@ static void _compress_etc2(Image *p_img, float p_lossy_quality, Image::CompressS
 void _register_etc_compress_func() {
 
 	Image::_image_compress_etc1_func = _compress_etc1;
-	//Image::_image_decompress_etc1 = _decompress_etc1;
-
 	Image::_image_compress_etc2_func = _compress_etc2;
-	//Image::_image_decompress_etc2 = _decompress_etc2;
 }
diff --git a/modules/gdscript/editor/gdscript_highlighter.cpp b/modules/gdscript/editor/gdscript_highlighter.cpp
index a1163b5d8d..c199667270 100644
--- a/modules/gdscript/editor/gdscript_highlighter.cpp
+++ b/modules/gdscript/editor/gdscript_highlighter.cpp
@@ -43,10 +43,6 @@ static bool _is_text_char(CharType c) {
 	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_';
 }
 
-static bool _is_whitespace(CharType c) {
-	return c == '\t' || c == ' ';
-}
-
 static bool _is_char(CharType c) {
 
 	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_';
diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index 55bc3d2359..ddd9e6b01c 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -51,12 +51,6 @@ void GDScriptLanguage::get_string_delimiters(List<String> *p_delimiters) const {
 	p_delimiters->push_back("\"\"\" \"\"\"");
 }
 Ref<Script> GDScriptLanguage::get_template(const String &p_class_name, const String &p_base_class_name) const {
-#ifdef TOOLS_ENABLED
-	bool th = EDITOR_DEF("text_editor/completion/add_type_hints", false);
-#else
-	bool th = false;
-#endif
-
 	String _template = "extends %BASE%\n"
 					   "\n"
 					   "# Declare member variables here. Examples:\n"
diff --git a/modules/stb_vorbis/SCsub b/modules/stb_vorbis/SCsub
index 897d05961c..d14939a3b1 100644
--- a/modules/stb_vorbis/SCsub
+++ b/modules/stb_vorbis/SCsub
@@ -3,8 +3,14 @@
 Import('env')
 Import('env_modules')
 
+env_stb_vorbis = env_modules.Clone()
+
 # Thirdparty source files
+thirdparty_sources = ["#thirdparty/misc/stb_vorbis.c"]
 
-env_stb_vorbis = env_modules.Clone()
+env_thirdparty = env_stb_vorbis.Clone()
+env_thirdparty.disable_warnings()
+env_thirdparty.add_source_files(env.modules_sources, thirdparty_sources)
 
+# Godot's own source files
 env_stb_vorbis.add_source_files(env.modules_sources, "*.cpp")
diff --git a/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp b/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp
index 57b6b5343e..5dbe0b4b00 100644
--- a/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp
+++ b/modules/stb_vorbis/audio_stream_ogg_vorbis.cpp
@@ -32,11 +32,6 @@
 
 #include "core/os/file_access.h"
 
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
-#include "thirdparty/misc/stb_vorbis.c"
-#pragma GCC diagnostic pop
-
 void AudioStreamPlaybackOGGVorbis::_mix_internal(AudioFrame *p_buffer, int p_frames) {
 
 	ERR_FAIL_COND(!active);
diff --git a/modules/stb_vorbis/audio_stream_ogg_vorbis.h b/modules/stb_vorbis/audio_stream_ogg_vorbis.h
index 71a957a6af..8b42111847 100644
--- a/modules/stb_vorbis/audio_stream_ogg_vorbis.h
+++ b/modules/stb_vorbis/audio_stream_ogg_vorbis.h
@@ -34,12 +34,7 @@
 #include "core/io/resource_loader.h"
 #include "servers/audio/audio_stream.h"
 
-#define STB_VORBIS_HEADER_ONLY
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
-#include "thirdparty/misc/stb_vorbis.c"
-#pragma GCC diagnostic pop
-#undef STB_VORBIS_HEADER_ONLY
+#include "thirdparty/misc/stb_vorbis.h"
 
 class AudioStreamOGGVorbis;
 
diff --git a/scene/2d/cpu_particles_2d.cpp b/scene/2d/cpu_particles_2d.cpp
index a8e0f0d07f..d29c6b37d5 100644
--- a/scene/2d/cpu_particles_2d.cpp
+++ b/scene/2d/cpu_particles_2d.cpp
@@ -507,10 +507,6 @@ static float rand_from_seed(uint32_t &seed) {
 	return float(seed % uint32_t(65536)) / 65535.0;
 }
 
-static float rand_from_seed_m1_p1(uint32_t &seed) {
-	return rand_from_seed(seed) * 2.0 - 1.0;
-}
-
 void CPUParticles2D::_particles_process(float p_delta) {
 
 	p_delta *= speed_scale;
diff --git a/scene/3d/cpu_particles.cpp b/scene/3d/cpu_particles.cpp
index 712f0ba78b..ec51c31674 100644
--- a/scene/3d/cpu_particles.cpp
+++ b/scene/3d/cpu_particles.cpp
@@ -471,10 +471,6 @@ static float rand_from_seed(uint32_t &seed) {
 	return float(seed % uint32_t(65536)) / 65535.0;
 }
 
-static float rand_from_seed_m1_p1(uint32_t &seed) {
-	return rand_from_seed(seed) * 2.0 - 1.0;
-}
-
 void CPUParticles::_particles_process(float p_delta) {
 
 	p_delta *= speed_scale;
diff --git a/scene/gui/link_button.cpp b/scene/gui/link_button.cpp
index 8560efdde5..d38a067fef 100644
--- a/scene/gui/link_button.cpp
+++ b/scene/gui/link_button.cpp
@@ -91,6 +91,7 @@ void LinkButton::_notification(int p_what) {
 					do_underline = underline_mode != UNDERLINE_MODE_NEVER;
 
 				} break;
+				case DRAW_HOVER_PRESSED: break; // Not used in this class
 				case DRAW_DISABLED: {
 
 					color = get_color("font_color_disabled");
diff --git a/scene/gui/texture_button.cpp b/scene/gui/texture_button.cpp
index a6a57b010f..413f9dbbe6 100644
--- a/scene/gui/texture_button.cpp
+++ b/scene/gui/texture_button.cpp
@@ -150,6 +150,7 @@ void TextureButton::_notification(int p_what) {
 					} else
 						texdraw = hover;
 				} break;
+				case DRAW_HOVER_PRESSED: break; // Not used in this class
 				case DRAW_DISABLED: {
 
 					if (disabled.is_null()) {
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index 0dc2ef105b..4de47b2cb0 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -120,41 +120,7 @@ static Ref<Texture> make_icon(T p_src) {
 	return texture;
 }
 
-static Ref<Shader> make_shader(const char *vertex_code, const char *fragment_code, const char *lighting_code) {
-	Ref<Shader> shader = (memnew(Shader()));
-	//shader->set_code(vertex_code, fragment_code, lighting_code);
-
-	return shader;
-}
-
-static Ref<BitmapFont> make_font(int p_height, int p_ascent, int p_valign, int p_charcount, const int *p_chars, const Ref<Texture> &p_texture) {
-
-	Ref<BitmapFont> font(memnew(BitmapFont));
-	font->add_texture(p_texture);
-
-	for (int i = 0; i < p_charcount; i++) {
-
-		const int *c = &p_chars[i * 8];
-
-		int chr = c[0];
-		Rect2 frect;
-		frect.position.x = c[1];
-		frect.position.y = c[2];
-		frect.size.x = c[3];
-		frect.size.y = c[4];
-		Point2 align(c[5], c[6] + p_valign);
-		int advance = c[7];
-
-		font->add_char(chr, 0, frect, align, advance);
-	}
-
-	font->set_height(p_height);
-	font->set_ascent(p_ascent);
-
-	return font;
-}
-
-static Ref<BitmapFont> make_font2(int p_height, int p_ascent, int p_charcount, const int *p_char_rects, int p_kerning_count, const int *p_kernings, int p_w, int p_h, const unsigned char *p_img) {
+static Ref<BitmapFont> make_font(int p_height, int p_ascent, int p_charcount, const int *p_char_rects, int p_kerning_count, const int *p_kernings, int p_w, int p_h, const unsigned char *p_img) {
 
 	Ref<BitmapFont> font(memnew(BitmapFont));
 
@@ -209,8 +175,6 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 
 	tex_cache = memnew(TexCacheMap);
 
-	//Ref<BitmapFont> default_font = make_font(_bi_font_normal_height,_bi_font_normal_ascent,_bi_font_normal_valign,_bi_font_normal_charcount,_bi_font_normal_characters,make_icon(font_normal_png));
-
 	// Font Colors
 
 	Color control_font_color = Color::html("e0e0e0");
@@ -913,9 +877,9 @@ void make_default_theme(bool p_hidpi, Ref<Font> p_font) {
 	if (p_font.is_valid()) {
 		default_font = p_font;
 	} else if (p_hidpi) {
-		default_font = make_font2(_hidpi_font_height, _hidpi_font_ascent, _hidpi_font_charcount, &_hidpi_font_charrects[0][0], _hidpi_font_kerning_pair_count, &_hidpi_font_kerning_pairs[0][0], _hidpi_font_img_width, _hidpi_font_img_height, _hidpi_font_img_data);
+		default_font = make_font(_hidpi_font_height, _hidpi_font_ascent, _hidpi_font_charcount, &_hidpi_font_charrects[0][0], _hidpi_font_kerning_pair_count, &_hidpi_font_kerning_pairs[0][0], _hidpi_font_img_width, _hidpi_font_img_height, _hidpi_font_img_data);
 	} else {
-		default_font = make_font2(_lodpi_font_height, _lodpi_font_ascent, _lodpi_font_charcount, &_lodpi_font_charrects[0][0], _lodpi_font_kerning_pair_count, &_lodpi_font_kerning_pairs[0][0], _lodpi_font_img_width, _lodpi_font_img_height, _lodpi_font_img_data);
+		default_font = make_font(_lodpi_font_height, _lodpi_font_ascent, _lodpi_font_charcount, &_lodpi_font_charrects[0][0], _lodpi_font_kerning_pair_count, &_lodpi_font_kerning_pairs[0][0], _lodpi_font_img_width, _lodpi_font_img_height, _lodpi_font_img_data);
 	}
 	Ref<Font> large_font = default_font;
 	fill_default_theme(t, default_font, large_font, default_icon, default_style, p_hidpi ? 2.0 : 1.0);
diff --git a/thirdparty/misc/stb_vorbis.h b/thirdparty/misc/stb_vorbis.h
new file mode 100644
index 0000000000..357efcd5fc
--- /dev/null
+++ b/thirdparty/misc/stb_vorbis.h
@@ -0,0 +1,2 @@
+#define STB_VORBIS_HEADER_ONLY
+#include "stb_vorbis.c"