initial commit

Makefile

@@ -0,0 +1,40 @@
+#!/usr/bin/make -f
+SHELL       :=/bin/sh
+.SHELLFLAGS :=-efc
+MAKEFLAGS   +=--no-print-directory
+
+SRC = main.cc coreutils-sort.cc overlay.cc print.cc sort.cc xxhash.cc
+
+CROSS ?=
+CC    =$(CROSS)gcc
+CXX   =$(CROSS)g++
+STRIP =$(CROSS)strip
+
+CFLAGS_LTO    ?=-flto=2 -fuse-linker-plugin -ffat-lto-objects -flto-partition=none
+CFLAGS_COMMON ?=-O2 -g -fPIE -fstack-protector-strong
+CFLAGS   ?=$(CFLAGS_COMMON) $(CFLAGS_LTO)
+CPPFLAGS ?=-Wall -Wextra -Werror=format-security -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
+CXXFLAGS ?=$(CFLAGS_COMMON) $(CFLAGS_LTO) -std=gnu++20
+LDFLAGS  ?=-Wl,-z,relro -Wl,-z,now -pie
+
+NO_WARN = attributes class-memaccess unused-function unused-result
+CPPFLAGS += $(foreach w,$(NO_WARN),-Wno-$(w))
+
+NO_CXX = rtti exceptions
+CXXFLAGS +=$(foreach f,$(NO_CXX),-fno-$(f))
+
+OBJ = $(SRC:.cc=.cc.o)
+
+.DEFAULT: all
+.PHONY: all build clean
+all build: overlaydirs
+
+%.cc.o: %.cc
+	$(CXX) -c $(CXXFLAGS) $(CPPFLAGS) -o $@ $^
+
+overlaydirs: $(OBJ)
+	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $^ \
+	$(if $(filter $(RELMODE),1),&& $(STRIP) --strip-debug --strip-unneeded $@)
+
+clean:
+	rm -f overlaydirs $(OBJ)