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lm-sensors/Makefile
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graysky 68bda21952 Fix iconv linking detection for glibc-based builds 
The current iconv detection checks if libiconv.so exists via ldconfig,
but fails on glibc systems where iconv is built into libc and doesn't
require separate linking. This causes build failures:

  ld: cannot find -liconv: No such file or directory

Replace the ldconfig check with a compile test that actually verifies
if iconv functions are available without additional libraries. This
correctly detects glibc's built-in iconv while still linking -liconv
on musl/uclibc systems that need it.

Fixes build on glibc-based systems including OpenWrt glibc targets.
2026-04-21 13:32:57 +02:00

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Makefile
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# Makefile - Makefile for a Linux module for reading sensor data.
# Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
#
# 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.
# Everything you may want to change is in the top of this file. Usually, you
# can just use the defaults, fortunately.
# You need a full complement of GNU utilities to run this Makefile
# successfully; most notably, you need GNU make, flex (>= 2.5.1)
# and bison.
# Uncomment the second line if you are a developer. This will enable many
# additional warnings at compile-time
#WARN := 0
WARN := 1
# Uncomment the second line if you want to get (loads of) debug information
# at run-time.
# Not recommended, unless you are actually debugging the code
DEBUG := 0
#DEBUG := 1
# Note that all the installation paths below can also be set on the make
# command line (e.g. "make PREFIX=/usr").
# If you want to install at some other place then at from which you will run
# everything, set DESTDIR to the extra prefix.
DESTDIR :=
# This is the prefix that will be used for almost all directories below.
PREFIX := /usr/local
# Your C compiler
CC := gcc
# This is the directory where sensors3.conf will be installed, if no other
# configuration file is found
ETCDIR := /etc
# You should not need to change this. It is the directory into which the
# library files (both static and shared) will be installed.
LIBDIR := $(PREFIX)/lib
# You should not need to change this. It is the directory into which the
# data files will be installed.
DATADIR := $(PREFIX)/share
# You should not need to change this. It is the directory into which the
# ZSH completion files will be installed.
ZSHCOMPDIR := $(DATADIR)/zsh/site-functions
# You should not need to change this. It is the directory into which the
# executable program files will be installed. BINDIR for programs that are
# also useful for normal users, SBINDIR for programs that can only be run
# by the superuser.
# Note that not all programs in this package are really installed;
# some are just examples. You can always install them by hand, of
# course.
BINDIR := $(PREFIX)/bin
SBINDIR := $(PREFIX)/sbin
# You should not need to change this. It is the basic directory into which
# include files will be installed. The actual directory will be
# $(INCLUDEDIR)/sensors for library include files.
INCLUDEDIR := $(PREFIX)/include
LIBINCLUDEDIR := $(INCLUDEDIR)/sensors
# You should not need to change this. It is the base directory under which the
# manual pages will be installed.
MANDIR := $(PREFIX)/man
ARCH := $(firstword $(subst -, ,$(shell $(CC) -dumpmachine)))
# Extra non-default programs to build; e.g., sensord
#PROG_EXTRA := sensord
# Build and install static library
BUILD_STATIC_LIB := 1
# Build and install shared library
BUILD_SHARED_LIB := 1
# Set these to add preprocessor or compiler flags, or use
# environment variables
# CFLAGS :=
# CPPFLAGS :=
##################################################
# Below this, nothing should need to be changed. #
##################################################
# Note that this is a monolithic Makefile; it calls no sub-Makefiles,
# but instead, it compiles everything right from here. Yes, there are
# some distinct advantages to this; see the following paper for more info:
# http://www.tip.net.au/~millerp/rmch/recu-make-cons-harm.html
# Note that is still uses Makefile fragments in sub-directories; these
# are called 'Module.mk'.
# Within each Module.mk, rules and dependencies can be added to targets
# all, install and clean. Use double colons instead of single ones
# to do this.
# The subdirectories we need to build things in
SRCDIRS := lib prog/debug prog/detect prog/pwm \
prog/sensors ${PROG_EXTRA:%=prog/%} etc
# Only build isadump and isaset on x86 machines.
ifneq (,$(findstring $(ARCH), i386 i486 i586 i686 x86_64))
SRCDIRS += prog/dump
endif
SRCDIRS += lib/test
# Some often-used commands with default options
MKDIR := mkdir -p
RMDIR := rmdir
RM := rm -f
MV := mv -f
BISON := bison
FLEX := flex
AR := ar
INSTALL := install
LN := ln -sf
GREP := grep
AWK := awk
SED := sed
# Determine the default compiler flags
# Set CFLAGS or CPPFLAGS above to add your own flags to all.
# ALLCPPFLAGS/ALLCFLAGS are common flags, plus any user-specified overrides from the environment or make command line.
# PROGCPPFLAGS/PROGCFLAGS is to create regular object files (which are linked into executables).
# ARCPPFLAGS/ARCFLAGS are used to create archive object files (static libraries).
# LIBCPPFLAGS/LIBCFLAGS are for shared library objects.
ALL_CPPFLAGS := -I.
ALL_CFLAGS := -Wall
ifeq ($(DEBUG),1)
ALL_CPPFLAGS += -DDEBUG
ALL_CFLAGS += -O -g
else
ALL_CFLAGS += -O2
endif
ifeq ($(WARN),1)
ALL_CFLAGS += -Wstrict-prototypes -Wshadow -Wpointer-arith -Wcast-qual \
-Wcast-align -Wwrite-strings -Wnested-externs -Winline -W \
-Wmissing-prototypes -Wundef
endif
ALL_CPPFLAGS += $(CPPFLAGS)
ALL_CFLAGS += $(CFLAGS)
PROGCPPFLAGS := -DETCDIR="\"$(ETCDIR)\"" $(ALL_CPPFLAGS)
PROGCFLAGS := $(ALL_CFLAGS)
ARCPPFLAGS := -DETCDIR="\"$(ETCDIR)\"" $(ALL_CPPFLAGS)
ARCFLAGS := $(ALL_CFLAGS)
LIBCPPFLAGS := -DETCDIR="\"$(ETCDIR)\"" $(ALL_CPPFLAGS)
LIBCFLAGS := -fpic -D_REENTRANT $(ALL_CFLAGS)
ALL_LDFLAGS := $(LDFLAGS)
# Determine iconv linking requirements
# glibc has built-in iconv, other libc implementations may need -liconv
ifndef LIBICONV
ICONV_TEST := $(shell printf '%s\n' \
'#include <iconv.h>' \
'int main() { iconv_t cd = iconv_open("UTF-8", "ASCII"); return 0; }' \
| $(CC) $(ALL_CPPFLAGS) -x c - -o /tmp/lm_sensors_iconv_test 2>/dev/null && echo "builtin" || echo "external")
ifeq ($(ICONV_TEST),builtin)
LIBICONV :=
else
LIBICONV := -liconv
endif
$(shell rm -f /tmp/lm_sensors_iconv_test)
endif
EXLDFLAGS := -Wl,-rpath,$(LIBDIR) $(ALL_LDFLAGS)
.PHONY: all user clean install user_install uninstall user_uninstall
# Make all the default rule
all::
# Include all makefiles for sub-modules
INCLUDEFILES :=
include $(patsubst %,%/Module.mk,$(SRCDIRS))
ifneq ($(MAKECMDGOALS),clean)
ifneq ($(MAKECMDGOALS),uninstall)
ifneq ($(MAKECMDGOALS),user_uninstall)
ifneq ($(MAKECMDGOALS),help)
include $(INCLUDEFILES)
endif
endif
endif
endif
# Man pages
MANPAGES := $(LIBMAN3FILES) $(LIBMAN5FILES) $(PROGDETECTMAN8FILES) $(PROGDUMPMAN8FILES) \
$(PROGSENSORSMAN1FILES) $(PROGPWMMAN8FILES) prog/sensord/sensord.8
check:: test
test:: shellcheck perlcheck test-sensors test-lib
shellcheck::
shellcheck $(SHELLCHECKFILES)
perlcheck::
for i in $(PERL_SOURCES) ; do perl -c $$i ; done
test-lib:: lib/test/test-scanner
cd lib/test ; ./test-scanner.pl
test-sensors:: prog/sensors/sensors
LD_LIBRARY_PATH=lib SENSORS_SYSFS_ROOT=prog/sensors/test/data/laptop prog/sensors/sensors -c /dev/null -J | jq -S | diff -u prog/sensors/test/data/laptop.json -
LD_LIBRARY_PATH=lib SENSORS_SYSFS_ROOT=prog/sensors/test/data/laptop prog/sensors/sensors -c /dev/null -J -f | jq -S | diff -u prog/sensors/test/data/laptop.f.json -
user ::
user_install::
@echo "*** Important notes:"
@echo "*** * The libsensors configuration file ($(ETCDIR)/sensors3.conf) is never"
@echo "*** overwritten by our installation process, so that you won't lose"
@echo "*** your personal settings in that file. You still can get our latest"
@echo "*** default config file in etc/sensors.conf.default and manually copy"
@echo "*** it to $(ETCDIR)/sensors3.conf if you want. You will then want to"
@echo "*** edit it to fit your needs again."
@echo "*** * The format of $(ETCDIR)/sensors3.conf changed with lm-sensors 3.0.0."
@echo "*** If you have a custom configuration file using the old format, you"
@echo "*** can convert it using the sensors-conf-convert script. Otherwise just"
@echo "*** overwrite your old configuration file with the new default one."
@echo "*** * As of lm-sensors 3.1.0, the default configuration file only"
@echo "*** contains statements which do not depend on how chips are wired."
@echo "*** If you miss parts of the bigger configuration file that used to be"
@echo "*** the default, copy the relevant parts from etc/sensors.conf.eg to"
@echo "*** $(ETCDIR)/sensors3.conf."
all :: user
install :: all user_install
clean::
$(RM) lm_sensors-* lex.backup
user_uninstall::
uninstall :: user_uninstall
help:
@echo 'Make targets are:'
@echo ' all (default): build library and userspace programs'
@echo ' install: install library and userspace programs'
@echo ' uninstall: uninstall library and userspace programs'
@echo ' clean: cleanup'
# Generate html man pages to be copied to the lm_sensors website.
# This uses the man2html from here
# http://ftp.math.utah.edu/pub/sgml/
# which works directly from the nroff source
manhtml:
$(MKDIR) html
cp $(MANPAGES) html
cd html ; \
export LOGNAME=sensors ; \
export HOSTNAME=hwmon.wiki.kernel.org ; \
man2html *.[1-8] ; \
$(RM) *.[1-8]
# Here, we define all implicit rules we want to use.
.SUFFIXES:
# We need to create dependency files. Tricky. The sed rule puts dir/file.d and
# dir/file.c in front of the dependency file rule.
# .ro files are used for programs (as opposed to modules)
%.ro: %.c
$(CC) $(PROGCPPFLAGS) $(PROGCFLAGS) -c $< -o $@
%.rd: %.c
$(CC) -M -MG $(PROGCPPFLAGS) $(PROGCFLAGS) $< | \
$(SED) -e 's@^\(.*\)\.o:@$*.rd $*.ro: Makefile '`dirname $*.rd`/Module.mk' @' > $@
# .ao files are used for static archives
%.ao: %.c
$(CC) $(ARCPPFLAGS) $(ARCFLAGS) -c $< -o $@
%.ad: %.c
$(CC) -M -MG $(ARCPPFLAGS) $(ARCFLAGS) $< | \
$(SED) -e 's@^\(.*\)\.o:@$*.ad $*.ao: Makefile '`dirname $*.ad`/Module.mk' @' > $@
# .lo files are used for shared libraries
%.lo: %.c
$(CC) $(LIBCPPFLAGS) $(LIBCFLAGS) -c $< -o $@
%.ld: %.c
$(CC) -M -MG $(LIBCPPFLAGS) $(LIBCFLAGS) $< | \
$(SED) -e 's@^\(.*\)\.o:@$*.ld $*.lo: Makefile '`dirname $*.ld`/Module.mk' @' > $@
# Flex and Bison
%.c: %.y
@if ! command -v $(BISON) 2> /dev/null ; then \
echo "Please install $(BISON), then run \"make clean\" and try again" ; \
false ; \
fi
$(BISON) -p sensors_yy -d $< -o $@
ifeq ($(DEBUG),1)
FLEX_FLAGS := -Psensors_yy -b -Cfe -8
else
FLEX_FLAGS := -Psensors_yy -Cfe -8
endif
%.c: %.l
@if ! command -v $(FLEX) 2> /dev/null ; then \
echo "Please install $(FLEX), then run \"make clean\" and try again" ; \
false ; \
fi
$(FLEX) $(FLEX_FLAGS) -o $@ $<
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