feat: add keyboard layout support

programs/src/keyboard/Makefile

@@ -0,0 +1,44 @@
+# Makefile for the Keyboard settings applet on MontaukOS
+
+MAKEFLAGS += -rR
+.SUFFIXES:
+
+TOOLCHAIN_PREFIX := $(shell cd ../../.. && pwd)/toolchain/local/bin/x86_64-montauk-
+ifeq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
+    CXX = $(error x86_64-montauk toolchain not found. Run ./toolchain/build-montauk-toolchain.sh first)
+else
+    CXX := $(TOOLCHAIN_PREFIX)g++
+endif
+
+PROG_INC := ../../include
+LINK_LD  := ../../link.ld
+BINDIR   := ../../bin
+OBJDIR   := obj
+LIBDIR   := ../../lib
+
+CXXFLAGS := -std=gnu++20 -g -O2 -pipe -Wall -Wextra -Wno-unused-parameter \
+    -Wno-unused-function -ffreestanding -fno-stack-protector -fno-stack-check \
+    -fno-rtti -fno-exceptions -ffunction-sections -fdata-sections -msse -msse2 \
+    -MMD -MP -I $(PROG_INC) -isystem $(PROG_INC)/libc
+LDFLAGS := -nostdlib -Wl,--gc-sections -T $(LINK_LD)
+
+SRCS := main.cpp stb_truetype_impl.cpp
+OBJS := $(addprefix $(OBJDIR)/,$(SRCS:.cpp=.o))
+TARGET := $(BINDIR)/apps/keyboard/keyboard.elf
+LIBS := $(LIBDIR)/libc/liblibc.a
+
+.PHONY: all clean
+all: $(TARGET)
+
+$(TARGET): $(OBJS) $(LINK_LD) Makefile $(LIBS)
+	mkdir -p $(BINDIR)/apps/keyboard
+	$(CXX) $(CXXFLAGS) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
+
+$(OBJDIR)/%.o: %.cpp Makefile
+	mkdir -p $(dir $@)
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+-include $(OBJS:.o=.d)
+
+clean:
+	rm -rf $(OBJDIR) $(TARGET)