app-laptop/msi-keyboard: fix build with GCC 12; respect CXX

Closes: https://bugs.gentoo.org/840329
Closes: https://bugs.gentoo.org/722324
Signed-off-by: Sam James <sam@gentoo.org>

app-laptop/msi-keyboard/files/msi-keyboard-1.0-gcc12.patch

@@ -0,0 +1,9 @@
+https://bugs.gentoo.org/840329
+--- a/main.cpp
++++ b/main.cpp
+@@ -1,4 +1,5 @@
+ #include "Keyboard.h"
++#include <cstring>
+ #include <regex>
+ #include <iostream>
+ 

app-laptop/msi-keyboard/files/msi-keyboard-1.0-r1-makefile.patch

@@ -0,0 +1,24 @@
+--- a/Makefile
++++ b/Makefile
+@@ -1,6 +1,7 @@
+-CC=g++
+-CFLAGS=-c -Wall
+-LDFLAGS=-lhidapi-libusb
++CXX?=g++
++COMMON_FLAGS=-Wall
++CXXFLAGS+=$(COMMON_FLAGS)
++LIBS=-lhidapi-libusb
+ SOURCES=main.cpp Keyboard.cpp Color.cpp
+ OBJECTS=$(SOURCES:.cpp=.o)
+ EXECUTABLE=msi-keyboard
+@@ -11,8 +12,8 @@ clean:
+ 	rm $(OBJECTS) $(EXECUTABLE)
+ 
+ $(EXECUTABLE): $(OBJECTS)
+-	$(CC) $(LDFLAGS) $(OBJECTS) -o $@
++	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) $(OBJECTS) $(LIBS) -o $@
+ 
+ .cpp.o:
+-	$(CC) $(CFLAGS) $< -o $@
++	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
+ 

app-laptop/msi-keyboard/msi-keyboard-1.0-r1.ebuild

@@ -0,0 +1,39 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit toolchain-funcs udev
+
+DESCRIPTION="Control backlight of MSI laptop keyboards"
+HOMEPAGE="https://github.com/makkarpov/msi-keyboard"
+SRC_URI="https://github.com/makkarpov/msi-keyboard/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64"
+
+RDEPEND="dev-libs/hidapi"
+DEPEND="${RDEPEND}"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-r1-makefile.patch
+	"${FILESDIR}"/${P}-gcc12.patch
+)
+
+src_configure() {
+	tc-export CXX
+}
+
+src_install() {
+	udev_dorules 99-msi-keyboard.rules
+	dobin msi-keyboard
+}
+
+pkg_prerm() {
+	udev_reload
+}
+
+pkg_postrm() {
+	udev_reload
+}