Makefile

# use this to disable flto optimizations:
#   make NO_FLTO=1
# and this to enable verbose mode:
#   make V=1
# an example how to build with CFI (https://en.wikipedia.org/wiki/Control-flow_integrity)
#   CC=clang-17 CFLAGS="-fsanitize=cfi -fno-sanitize-trap -fvisibility=hidden" make
# and this to run the clang static analyzer on a clean build:
#   make scan
# or with another version of it:
#   make scan SCANBUILD=scan-build

#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2014  Vyacheslav Trushkin
# Copyright (C) 2020-2026  Boian Bonev
#
# This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#

TARGET=iotop

SRCS:=$(wildcard src/*.c)
OBJS:=$(patsubst %c,%o,$(patsubst src/%,bld/%,$(SRCS)))
DEPS:=$(OBJS:.o=.d)

ifndef NO_FLTO
CFLAGS?=-O3 -fno-stack-protector -mno-stackrealign
CFLAGS+=-flto=auto
else
CFLAGS?=-O3 -fno-stack-protector -mno-stackrealign
endif

ifdef GCCFANALIZER
CFLAGS+=-fanalyzer
endif

PREFIX?=$(DESTDIR)/usr
BINDIR?=$(PREFIX)/sbin
INSTALL?=install
STRIP?=strip

PKG_CONFIG?=pkg-config
SCANBUILD?=scan-build-23
NCCC?=$(shell $(PKG_CONFIG) --cflags ncursesw)
NCLD?=$(shell $(PKG_CONFIG) --libs ncursesw)
ifeq ("$(NCLD)","")
NCCC:=$(shell $(PKG_CONFIG) --cflags ncurses)
NCLD:=$(shell $(PKG_CONFIG) --libs ncurses)
endif
ifeq ("$(NCLD)","")
NCCC:=
NCLD:=-lncursesw
endif

# for glibc < 2.17, -lrt is required for clock_gettime
NEEDLRT:=$(shell if $(CC) -E glibcvertest.h -o -|grep IOTOP_NEED_LRT|grep -q yes;then echo need; fi)
# some architectures do not have -mno-stackrealign
HAVESREA:=$(shell if $(CC) -mno-stackrealign -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old comiplers do not have -Wdate-time
HAVEWDTI:=$(shell if $(CC) -Wdate-time -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old compilers can not generate dependencies
HAVEDEPS:=$(shell if $(CC) -MM -MT /dev/null -MF /dev/null /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old compilers do not understand C standard
HAVECSTD:=$(shell if $(CC) --std=gnu89 -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old compilers do not have -Wformat-signedness; clang only warns on unknown warning options
HAVEWFSN:=$(shell if $(CC) -Werror -Wformat-signedness -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old compilers do not understand -flto=auto
HAVEFLTA:=$(shell if $(CC) -flto=auto -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old compilers do not understand -flto at all
HAVEFLTO:=$(shell if $(CC) -flto -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# gcc needs fat lto objects to emit the late warnings (e.g. -Wformat-truncation) at compile time; clang only warns on unsupported optimization flags
HAVEFFLO:=$(shell if $(CC) -Werror -ffat-lto-objects -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)
# old compilers do not understand -pie; clang yields error when stderr is redirected :(
HAVELPIE:=$(shell if $(CC) -Wno-unused-command-line-argument -pie -xc -c /dev/null -o /dev/null >/dev/null 2>/dev/null;then echo yes;else echo no;fi)

MYCFLAGS:=$(CPPFLAGS) $(CFLAGS) $(NCCC) -Wall -Wextra -Wformat -Wformat-signedness -Werror=format-security -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wundef -Wdate-time -D_FORTIFY_SOURCE=2 --std=gnu89 -fPIE
MYLIBS:=$(NCLD) $(LIBS)
MYLDFLAGS:=$(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -fPIE -pie

ifeq ("$(HAVESREA)","no")
MYCFLAGS:=$(filter-out -mno-stackrealign,$(MYCFLAGS))
MYLDFLAGS:=$(filter-out -mno-stackrealign,$(MYLDFLAGS))
endif

ifeq ("$(HAVEWDTI)","no")
MYCFLAGS:=$(filter-out -Wdate-time,$(MYCFLAGS))
MYLDFLAGS:=$(filter-out -Wdate-time,$(MYLDFLAGS))
endif

ifeq ("$(HAVEWFSN)","no")
MYCFLAGS:=$(filter-out -Wformat-signedness,$(MYCFLAGS))
endif

ifeq ("$(HAVECSTD)","no")
MYCFLAGS:=$(filter-out --std=gnu89,$(MYCFLAGS))
MYLDFLAGS:=$(filter-out --std=gnu89,$(MYLDFLAGS))
MYCFLAGS:=$(filter-out -D_FORTIFY_SOURCE=2,$(MYCFLAGS))
MYLDFLAGS:=$(filter-out -D_FORTIFY_SOURCE=2,$(MYLDFLAGS))
endif

ifeq ("$(HAVEFLTA)","no")
ifndef NO_FLTO
ifeq ("$(HAVEFLTO)","no")
MYCFLAGS:=$(filter-out -flto=auto,$(MYCFLAGS))
MYLDFLAGS:=$(filter-out -flto=auto,$(MYLDFLAGS))
else
MYCFLAGS:=$(filter-out -flto=auto,$(MYCFLAGS))
MYLDFLAGS:=$(filter-out -flto=auto,$(MYLDFLAGS))
MYCFLAGS+=-flto
MYLDFLAGS+=-flto
endif
endif
endif

ifndef NO_FLTO
ifeq ("$(HAVEFFLO)","yes")
MYCFLAGS+=-ffat-lto-objects
endif
endif

ifeq ("$(HAVELPIE)","no")
MYLDFLAGS:=$(filter-out -pie,$(MYLDFLAGS))
endif

ifeq ("$(NEEDLRT)","need")
# with the libraries after the objects, or --as-needed drops it
MYLIBS+=-lrt
endif

ifeq ("$(V)","1")
Q:=
E:=@true
else
Q:=@
E:=@echo
endif

ifeq ("$(HAVEDEPS)","no")
NDEP:=@true
else
NDEP:=
endif

all: $(TARGET)

$(TARGET): $(OBJS)
	$(E) LD $@
	$(Q)$(CC) -o $@ $(MYLDFLAGS) $^ $(MYLIBS)

bld/%.o: src/%.c bld/.mkdir
	$(NDEP) $(E) DE $@
	$(NDEP) $(Q)$(CC) $(MYCFLAGS) -MM -MT $@ -MF $(patsubst %.o,%.d,$@) $<
	$(E) CC $@
	$(Q)$(CC) $(MYCFLAGS) -c -o $@ $<

clean:
	$(E) CLEAN
	$(Q)rm -rf ./bld $(TARGET)

check: $(TARGET)
	$(E) CHECK
	$(Q)fail=0; \
	for t in tests/tests-*.sh; do \
		printf "%s..." "$$t"; \
		if IOTOP="$${IOTOP:-./$(TARGET)}" "./$$t"; then \
			echo "OK"; \
		else \
			rc=$$?; \
			echo "ERROR($$rc)"; \
			fail=1; \
		fi; \
	done; \
	exit $$fail

scan:
	$(E) SCAN
	$(Q)$(SCANBUILD) $(MAKE) --no-print-directory re

install: $(TARGET)
	$(E) STRIP $(TARGET)
	$(Q)$(STRIP) $(TARGET)
	$(E) INSTALL $(TARGET)
	$(Q)$(INSTALL) -D -m 0755 $(TARGET) $(BINDIR)/$(TARGET)
	$(Q)$(INSTALL) -D -m 0644 iotop.8 $(PREFIX)/share/man/man8/iotop.8

uninstall:
	$(E) UNINSTALL $(TARGET)
	$(Q)rm -f $(BINDIR)/$(TARGET)
	$(Q)rm -f $(PREFIX)/share/man/man8/iotop.8

bld/.mkdir:
	$(Q)mkdir -p bld
	$(Q)touch bld/.mkdir

VER:=$(shell grep ' VERSION ' src/iotop.h|tr -d '\"'|awk '{print $$3}')
mkotar:
	$(MAKE) clean
	-dh_clean
	tar \
		--xform 's,^[.],iotop-$(VER),' \
		--exclude ./.git \
		--exclude ./.gitignore \
		--exclude ./debian \
		-Jcvf ../iotop-c_$(VER).orig.tar.xz .
	-rm -f ../iotop-c_$(VER).orig.tar.xz.asc
	gpg -a --detach-sign ../iotop-c_$(VER).orig.tar.xz
	cp -fa ../iotop-c_$(VER).orig.tar.xz ../iotop-$(VER).tar.xz
	cp -fa ../iotop-c_$(VER).orig.tar.xz.asc ../iotop-$(VER).tar.xz.asc

re:
	$(Q)$(MAKE) --no-print-directory clean
	$(Q)$(MAKE) --no-print-directory -j

pv:
	@echo CC: $(CC)
	@echo SCANBUILD: $(SCANBUILD)
	@echo CFLAGS: $(CFLAGS)
	@echo LDFLAGS: $(LDFLAGS)
	@echo LIBS: $(LIBS)
	@echo NCCC: $(NCCC)
	@echo NCLD: $(NCLD)
	@echo NEEDLRT: $(NEEDLRT)
	@echo HAVESREA: $(HAVESREA)
	@echo HAVEWDTI: $(HAVEWDTI)
	@echo HAVEDEPS: $(HAVEDEPS)
	@echo HAVEWFSN: $(HAVEWFSN)
	@echo HAVECSTD: $(HAVECSTD)
	@echo HAVEFLTA: $(HAVEFLTA)
	@echo HAVEFLTO: $(HAVEFLTO)
	@echo HAVEFFLO: $(HAVEFFLO)
	@echo HAVELPIE: $(HAVELPIE)
	@echo MYCFLAGS: $(MYCFLAGS)
	@echo MYLDFLAGS: $(MYLDFLAGS)
	@echo MYLIBS: $(MYLIBS)

-include $(DEPS)

.PHONY: all clean check scan install uninstall mkotar re pv