Having trouble using AC_CHECK_LIB

Julian Marchant Sun, 01 Mar 2015 21:52:49 -0800


I'm stuck at one part. Project: Starfighter requires SDL_Image and
SDL_Mixer from SDL2 in order to build, so I'm trying to check for them
by using AC_CHECK_LIB with functions defined by SDL_Image and
SDL_Mixer. These are my checks (you can see the attached file for the
full configure.ac):

    AC_CHECK_LIB([SDL2], [SDL_Init], [], [echo "Error: SDL2 not
found." ; exit 1])
    AC_CHECK_LIB([SDL2], [IMG_Load], [], [echo "Error: SDL_Image not
found." ; exit 1])
    AC_CHECK_LIB([SDL2], [Mix_LoadWAV], [], [echo "Error: SDL_Mixer
not found." ; exit 1])

When I generate and run a configure script, the first check always
passes, but the second and third always fail (I checked the third by
removing the exit call from the second one). But I know I have
SDL_Image and SDL_Mixer for SDL2, because I can compile Project:
Starfighter with the hand-made Makefile (attached) just fine.

So, I suppose I have two questions:

1. Am I doing something I shouldn't be doing? (e.g. is it bad to check
a library more than once?)

2a. If so, what am I supposed to do to check for something like
SDL_Image and SDL_Mixer (where it's in the same library, but
separately packaged)?

2b. If not, how can I figure out what's wrong?

- -- 
Julian Marchant
https://onpon4.github.io

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#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
# Copyright (c) 2015 Julian Marchant <[email protected]>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

AC_PREREQ([2.69])
AC_INIT([Project: Starfighter], [1.3], [[email protected]])
AM_INIT_AUTOMAKE([foreign -Wall -Werror])
AC_CONFIG_SRCDIR([src/Starfighter.cpp])
AC_CONFIG_HEADERS([config.h])

# Checks for programs.
AC_PROG_CXX
AC_PROG_INSTALL

# Checks for libraries.
AC_CHECK_LIB([SDL2], [SDL_Init], [], [echo "Error: SDL2 not found." ; exit 1])
AC_CHECK_LIB([SDL2], [IMG_Load], [], [echo "Error: SDL_Image not found." ; exit 
1])
AC_CHECK_LIB([SDL2], [Mix_LoadWAV], [], [echo "Error: SDL_Mixer not found." ; 
exit 1])

# Checks for header files.
AC_CHECK_HEADERS([stdlib.h string.h time.h math.h sys/types/h sys/stat.h 
unistd.h])

# Checks for typedefs, structures, and compiler characteristics.
AC_CHECK_HEADER_STDBOOL
AC_C_INLINE
AC_TYPE_INT16_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT8_T

# Checks for library functions.
AC_FUNC_MALLOC
AC_CHECK_FUNCS([atexit mkdir])

AC_CONFIG_FILES([
        Makefile
        src/Makefile
])
AC_OUTPUT

CXXFLAGS ?= -O2 -Wall -g
CXXFLAGS += `pkg-config --cflags sdl2 SDL2_image SDL2_mixer` -DLINUX -lSDL2
LIBS = `pkg-config --libs sdl2 SDL2_image SDL2_mixer`
OBJS = ai.o aliens.o audio.o bullets.o cargo.o collectable.o comms.o debris.o 
events.o explosions.o game.o globals.o graphics.o init.o intermission.o 
loadSave.o messages.o misc.o missions.o player.o resources.o script.o shop.o 
Starfighter.o title.o weapons.o

VERSION = 1.3-dev
PROG = starfighter
DOCS = docs/*
DATA = data gfx sound
DATAFILES = data/* gfx/* sound/*

PREFIX ?= /usr
BINDIR ?= $(PREFIX)/games/
DATADIR ?= $(PREFIX)/share/games/parallelrealities/
DOCDIR ?= $(PREFIX)/share/doc/$(PROG)/

# top-level rule to create the program.
ALL = $(PROG)

all: $(ALL)

# compiling other source files.
%.o: src/%.cpp src/*.h
        $(CXX) $(CXXFLAGS) -c -DVERSION=\"$(VERSION)\" -DDATADIR=\"$(DATADIR)\" 
$<

# linking the program.
$(PROG): $(OBJS)
        $(CXX) $(CXXFLAGS) $(LDFLAGS) $(OBJS) -o $(PROG) $(LIBS)

# cleaning everything that can be automatically recreated with "make".
clean:
        $(RM) $(OBJS) $(ALL)

# install
install: $(ALL)
        mkdir -p $(DESTDIR)$(BINDIR)
        mkdir -p $(DESTDIR)$(DATADIR)
        mkdir -p $(DESTDIR)$(DOCDIR)

        install -m 755 $(PROG) $(DESTDIR)$(BINDIR)$(PROG)
        cp -pr $(DATA) $(DESTDIR)$(DATADIR)
        cp -p $(DOCS) $(DESTDIR)$(DOCDIR)

optimise:
        advpng -z gfx/*.png
        jpegoptim --strip-all gfx/*.jpg

dist:
        rm -rf starfighter-$(VERSION)
        mkdir starfighter-$(VERSION)
        cp --parents -lt starfighter-$(VERSION) `git ls-files`
        git log >starfighter-$(VERSION)/ChangeLog
        tar czf starfighter-$(VERSION).tar.gz starfighter-$(VERSION)
        rm -rf starfighter-$(VERSION)

.PHONY: all clean install optimise dist

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Description: PGP signature

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