configure.in
author Sam Lantinga <slouken@libsdl.org>
Sat, 29 Nov 2014 14:41:43 -0800
changeset 467 2b0ada991468
parent 437 e6a0027dfaec
child 487 20954174d833
permissions -rw-r--r--
Fixed bug 2795 - SDL library detection selects the wrong lib

Chris Beck

When creating a homebrew recipe for wesnoth, I discovered that the SDL image configuration routine does not detect libpng properly -- if you have multiple instances of libpng on your system, and you use environment variables to select an instance which is not in your system directory, the build can be broken, because it will run configuration tests against the system installed version, but deduce that it should use the filename of the system-installed version. In a vanilla build of wesnoth using homebrew, this results in segfaults at runtime, because you end up linking against two different versions of libpng, which is also needed independently of SDL.

The problem is essentially in the "find_lib" routine in the configure file:



find_lib()
{
gcc_bin_path=[`$CC -print-search-dirs 2>/dev/null | fgrep programs: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
gcc_lib_path=[`$CC -print-search-dirs 2>/dev/null | fgrep libraries: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
env_lib_path=[`echo $LIBS $LDFLAGS | sed 's/-L[ ]*//g'`]
for path in $gcc_bin_path $gcc_lib_path $env_lib_path /usr/lib /usr/local/lib; do
lib=[`ls -- $path/$1 2>/dev/null | sort -r | sed 's/.*\/\(.*\)/\1/; q'`]
if test x$lib != x; then
echo $lib
return
fi
done
}



Because the for loop goes over the system directories before the environment directories, any system-installed lib will shadow the lib selected via environment variables. This is contrary to the behavior of the configuration tests earlier in the script, which prefers the environment variable libs over the system-installed libs. The 'for' loop should instead be:



for path in $env_lib_path $gcc_bin_path $gcc_lib_path /usr/lib /usr/local/lib; do



You can see the full discussion on the Homebrew / linuxbrew issue tracker here: https://github.com/Homebrew/linuxbrew/issues/172

I have checked that this bug also affects SDL 1.2.15, SDL_mixer and SDL_ttf 1.2, which all use this same "find_lib" routine. I have not determined if the bug affects SDL 2.0, which seems not to use this exact routine.
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dnl Process this file with autoconf to produce a configure script.
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AC_INIT(README.txt)
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dnl Set various version strings - taken gratefully from the GTk sources
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# Making releases:
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#   MICRO_VERSION += 1;
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#   INTERFACE_AGE += 1;
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#   BINARY_AGE += 1;
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# if any functions have been added, set INTERFACE_AGE to 0.
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# if backwards compatibility has been broken,
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# set BINARY_AGE and INTERFACE_AGE to 0.
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MAJOR_VERSION=2
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MINOR_VERSION=0
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MICRO_VERSION=0
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INTERFACE_AGE=0
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BINARY_AGE=0
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VERSION=$MAJOR_VERSION.$MINOR_VERSION.$MICRO_VERSION
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AC_SUBST(MAJOR_VERSION)
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AC_SUBST(MINOR_VERSION)
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AC_SUBST(MICRO_VERSION)
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AC_SUBST(INTERFACE_AGE)
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AC_SUBST(BINARY_AGE)
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AC_SUBST(VERSION)
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# libtool versioning
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LT_INIT([win32-dll])
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LT_RELEASE=$MAJOR_VERSION.$MINOR_VERSION
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LT_CURRENT=`expr $MICRO_VERSION - $INTERFACE_AGE`
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LT_REVISION=$INTERFACE_AGE
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LT_AGE=`expr $BINARY_AGE - $INTERFACE_AGE`
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AC_SUBST(LT_RELEASE)
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AC_SUBST(LT_CURRENT)
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AC_SUBST(LT_REVISION)
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AC_SUBST(LT_AGE)
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dnl Detect the canonical build and host environments
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AC_CANONICAL_HOST
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dnl Setup for automake
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AM_INIT_AUTOMAKE(SDL2_image, $VERSION)
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dnl Check for tools
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AC_PROG_LIBTOOL
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AC_PROG_CC
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AC_PROG_OBJC
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AC_C_INLINE
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AC_PROG_INSTALL
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AC_PROG_MAKE_SET
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if test -z "$host_alias"; then
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    hostaliaswindres=
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else
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    hostaliaswindres="$host_alias-windres"
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fi
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AC_CHECK_PROGS(WINDRES, [windres $hostaliaswindres $host_os-windres])
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case "$host" in
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    *-*-beos*)
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        ac_default_prefix=/boot/develop/tools/gnupro
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        ;;
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    *-*-cygwin* | *-*-mingw32*)
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        if test "$build" != "$host"; then # cross-compiling
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            # Default cross-compile location
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            ac_default_prefix=/usr/local/cross-tools/$host
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        else
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            # Look for the location of the tools and install there
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            if test "$BUILD_PREFIX" != ""; then
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                ac_default_prefix=$BUILD_PREFIX
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            fi
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        fi
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        if test x$WINDRES != x; then
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            use_version_rc=true
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        fi
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        ;;
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    *-*-darwin*)
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        AC_ARG_ENABLE([imageio], [AC_HELP_STRING([--enable-imageio], [use native Mac OS X frameworks for loading images [default=yes]])],
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                      [], [enable_imageio=yes])
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        if test x$enable_imageio = xyes; then
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            IMG_LIBS="-Wl,-framework,ApplicationServices -lobjc $IMG_LIBS"
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        else
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            CFLAGS="$CFLAGS -DSDL_IMAGE_USE_COMMON_BACKEND"
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        fi
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        ;;
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esac
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AM_CONDITIONAL(USE_IMAGEIO, test x$enable_imageio = xyes)
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AM_CONDITIONAL(USE_VERSION_RC, test x$use_version_rc = xtrue)
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dnl set this to use on systems that use lib64 instead of lib
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base_libdir=`echo \${libdir} | sed 's/.*\/\(.*\)/\1/; q'`
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dnl Function to find a library in the compiler search path
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find_lib()
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{
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    gcc_bin_path=[`$CC -print-search-dirs 2>/dev/null | fgrep programs: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
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    gcc_lib_path=[`$CC -print-search-dirs 2>/dev/null | fgrep libraries: | sed 's/[^=]*=\(.*\)/\1/' | sed 's/:/ /g'`]
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    env_lib_path=[`echo $LIBS $LDFLAGS $* | sed 's/-L[ ]*//g'`]
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    if test "$cross_compiling" = yes; then
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        host_lib_path=""
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    else
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        host_lib_path="/usr/$base_libdir /usr/local/$base_libdir"
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    fi
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    for path in $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
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        lib=[`ls -- $path/$1 2>/dev/null | sed -e '/\.so\..*\./d' -e 's,.*/,,' | sort | tail -1`]
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        if test x$lib != x; then
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            echo $lib
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            return
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        fi
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    done
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}
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dnl Check for SDL
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SDL_VERSION=2.0.0
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AC_SUBST(SDL_VERSION)
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AM_PATH_SDL2($SDL_VERSION,
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            :,
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           AC_MSG_ERROR([*** SDL version $SDL_VERSION not found!])
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)
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CFLAGS="$CFLAGS $SDL_CFLAGS"
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LIBS="$LIBS $SDL_LIBS"
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saved_LIBS="$LIBS"
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dnl Check command-line options
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AC_ARG_ENABLE([bmp], [AC_HELP_STRING([--enable-bmp], [support loading BMP/ICO/CUR images [default=yes]])],
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 [], [enable_bmp=yes])
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AC_ARG_ENABLE([gif], [AC_HELP_STRING([--enable-gif], [support loading GIF images [default=yes]])],
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 [], [enable_gif=yes])
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AC_ARG_ENABLE([jpg], [AC_HELP_STRING([--enable-jpg], [support loading JPG images [default=yes]])],
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 [], [enable_jpg=yes])
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AC_ARG_ENABLE([jpg-shared], AC_HELP_STRING([--enable-jpg-shared], [dynamically load JPG support [[default=yes]]]),
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 [], [enable_jpg_shared=yes])
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AC_ARG_ENABLE([lbm], [AC_HELP_STRING([--enable-lbm], [support loading LBM images [default=yes]])],
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 [], [enable_lbm=yes])
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AC_ARG_ENABLE([pcx], [AC_HELP_STRING([--enable-pcx], [support loading PCX images [default=yes]])],
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 [], [enable_pcx=yes])
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AC_ARG_ENABLE([png], [AC_HELP_STRING([--enable-png], [support loading PNG images [default=yes]])],
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 [], [enable_png=yes])
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AC_ARG_ENABLE([png-shared], AC_HELP_STRING([--enable-png-shared], [dynamically load PNG support [[default=yes]]]),
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 [], [enable_png_shared=yes])
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AC_ARG_ENABLE([pnm], [AC_HELP_STRING([--enable-pnm], [support loading PNM images [default=yes]])],
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 [], [enable_pnm=yes])
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AC_ARG_ENABLE([tga], [AC_HELP_STRING([--enable-tga], [support loading TGA images [default=yes]])],
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 [], [enable_tga=yes])
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AC_ARG_ENABLE([tif], [AC_HELP_STRING([--enable-tif], [support loading TIFF images [default=yes]])],
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 [], [enable_tif=yes])
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AC_ARG_ENABLE([tif-shared], AC_HELP_STRING([--enable-tif-shared], [dynamically load TIFF support [[default=yes]]]),
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 [], [enable_tif_shared=yes])
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AC_ARG_ENABLE([xcf], [AC_HELP_STRING([--enable-xcf], [support loading XCF images [default=yes]])],
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 [], [enable_xcf=yes])
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AC_ARG_ENABLE([xpm], [AC_HELP_STRING([--enable-xpm], [support loading XPM images [default=yes]])],
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 [], [enable_xpm=yes])
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AC_ARG_ENABLE([xv], [AC_HELP_STRING([--enable-xv], [support loading XV images [default=yes]])],
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 [], [enable_xv=yes])
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AC_ARG_ENABLE([webp], [AC_HELP_STRING([--enable-webp], [support loading WEBP images [default=yes]])],
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 [], [enable_webp=yes])
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AC_ARG_ENABLE([webp-shared], AC_HELP_STRING([--enable-webp-shared], [dynamically load WEBP support [[default=yes]]]),
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 [], [enable_webp_shared=yes])
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dnl Show a message when we use ImageIO support so it's not a surprise
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AC_MSG_CHECKING([for ImageIO support])
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AC_MSG_RESULT($enable_imageio)
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if (test x$enable_jpg = xyes || test x$enable_tif = xyes) && test x$enable_imageio != xyes; then
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    AC_CHECK_HEADER([jpeglib.h], [have_jpg_hdr=yes])
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    AC_CHECK_LIB([jpeg], [jpeg_CreateDecompress], [have_jpg_lib=yes])
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    if test x$have_jpg_hdr = xyes -a x$have_jpg_lib = xyes; then
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        if test x$enable_jpg = xyes; then
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            AC_DEFINE([LOAD_JPG])
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        fi
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        LIBS="-ljpeg $LIBS"
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        case "$host" in
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            *-*-darwin*)
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                jpg_lib=[`find_lib libjpeg.dylib`]
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                ;;
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            *-*-cygwin* | *-*-mingw32*)
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                jpg_lib=[`find_lib "libjpeg*.dll"`]
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                ;;
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            *)
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                jpg_lib=[`find_lib "libjpeg[0-9]*.so.*"`]
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                if test x$jpg_lib = x; then
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                    jpg_lib=[`find_lib "libjpeg.so.*"`]
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                fi
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                ;;
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        esac
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    elif test x$enable_jpg = xyes; then
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        AC_MSG_WARN([*** Unable to find JPEG library (http://www.ijg.org/)])
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        AC_MSG_WARN([JPG image loading disabled])
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    fi
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fi
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if test x$enable_png = xyes -a x$enable_imageio != xyes; then
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    PKG_CHECK_MODULES([LIBPNG], [libpng], [dnl
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        have_png_hdr=yes
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        CFLAGS="$LIBPNG_CFLAGS $CFLAGS"
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        have_png_lib=yes
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      ], [dnl
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        AC_CHECK_HEADER([png.h], [have_png_hdr=yes])
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        AC_CHECK_LIB([png], [png_create_read_struct], [have_png_lib=yes], [], [-lz])
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      ])
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    if test x$have_png_hdr = xyes -a x$have_png_lib = xyes; then
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        AC_DEFINE([LOAD_PNG])
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        case "$host" in
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            *-*-darwin*)
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                png_lib=[`find_lib libpng.dylib`]
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                ;;
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            *-*-cygwin* | *-*-mingw32*)
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                png_lib=[`find_lib "libpng*.dll"`]
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                ;;
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            *)
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                png_lib=[`find_lib "libpng[0-9]*.so.*"`]
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                if test x$png_lib = x; then
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                    png_lib=[`find_lib "libpng.so.*"`]
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                fi
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                ;;
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        esac
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    else
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        AC_MSG_WARN([*** Unable to find PNG library (http://www.libpng.org/pub/png/libpng.html)])
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        AC_MSG_WARN([PNG image loading disabled])
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    fi
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fi
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if test x$enable_tif = xyes -a x$enable_imageio != xyes; then
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    AC_CHECK_HEADER([tiffio.h], [have_tif_hdr=yes])
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    AC_CHECK_LIB([tiff], [TIFFClientOpen], [have_tif_lib=yes], [], [-lz])
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    if test x$have_tif_hdr = xyes -a x$have_tif_lib = xyes; then
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        AC_DEFINE([LOAD_TIF])
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        case "$host" in
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            *-*-darwin*)
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                tif_lib=[`find_lib libtiff.dylib`]
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                ;;
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            *-*-cygwin* | *-*-mingw32*)
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                tif_lib=[`find_lib "libtiff-*.dll"`]
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                ;;
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            *)
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                tif_lib=[`find_lib "libtiff[0-9]*.so.*"`]
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                if test x$tif_lib = x; then
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                    tif_lib=[`find_lib "libtiff.so.*"`]
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                fi
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                ;;
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        esac
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    else
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        AC_MSG_WARN([*** Unable to find Tiff library (http://www.remotesensing.org/libtiff/)])
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        AC_MSG_WARN([TIF image loading disabled])
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    fi
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fi
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if test x$enable_webp = xyes; then
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    PKG_CHECK_MODULES([LIBWEBP], [libwebp], [dnl
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        have_webp_hdr=yes
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        CFLAGS="$LIBWEBP_CFLAGS $CFLAGS"
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        have_webp_lib=yes
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      ], [dnl
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        AC_CHECK_HEADER([webp/decode.h], [have_webp_hdr=yes])
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        AC_CHECK_LIB([webp], [WebPGetDecoderVersion], [have_webp_lib=yes], [], [-lm])
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      ])
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    if test x$have_webp_hdr = xyes -a x$have_webp_lib = xyes; then
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        AC_DEFINE([LOAD_WEBP])
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        case "$host" in
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            *-*-darwin*)
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                webp_lib=[`find_lib libwebp.dylib`]
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                ;;
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            *-*-cygwin* | *-*-mingw32*)
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                webp_lib=[`find_lib "libwebp*.dll"`]
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                ;;
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            *)
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                webp_lib=[`find_lib "libwebp[0-9]*.so.*"`]
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                if test x$webp_lib = x; then
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                    webp_lib=[`find_lib "libwebp.so.*"`]
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                fi
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                ;;
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        esac
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    else
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        AC_MSG_WARN([*** Unable to find WEBP library (http://code.google.com/intl/en-US/speed/webp/index.html)])
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        AC_MSG_WARN([WEBP Pimage loading disabled])
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    fi
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fi
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if test x$enable_bmp = xyes; then
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    AC_DEFINE([LOAD_BMP])
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fi
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if test x$enable_gif = xyes; then
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    AC_DEFINE([LOAD_GIF])
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fi
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if test x$enable_lbm = xyes; then
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    AC_DEFINE([LOAD_LBM])
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fi
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if test x$enable_pcx = xyes; then
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    AC_DEFINE([LOAD_PCX])
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fi
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   300
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if test x$enable_pnm = xyes; then
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    AC_DEFINE([LOAD_PNM])
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fi
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   304
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   305
if test x$enable_tga = xyes; then
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    AC_DEFINE([LOAD_TGA])
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fi
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   308
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   309
if test x$enable_xcf = xyes; then
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    AC_DEFINE([LOAD_XCF])
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   311
fi
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   312
slouken@7
   313
if test x$enable_xpm = xyes; then
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   314
    AC_DEFINE([LOAD_XPM])
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   315
fi
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   316
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   317
if test x$enable_xv = xyes; then
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   318
    AC_DEFINE([LOAD_XV])
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   319
fi
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   320
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   321
if test x$enable_webp = xyes -a x$have_webp_hdr = xyes -a x$have_webp_lib = xyes; then
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   322
    if test x$enable_webp_shared = xyes && test x$webp_lib != x; then
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   323
        echo "-- dynamic libwebp -> $webp_lib"
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   324
        AC_DEFINE_UNQUOTED(LOAD_WEBP_DYNAMIC, "$webp_lib")
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   325
    else
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   326
        IMG_LIBS="-lwebp $IMG_LIBS"
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   327
    fi
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   328
fi
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   329
slouken@168
   330
if test x$enable_tif = xyes -a x$have_tif_hdr = xyes -a x$have_tif_lib = xyes; then
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   331
    if test x$enable_tif_shared = xyes && test x$tif_lib != x; then
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   332
        echo "-- dynamic libtiff -> $tif_lib"
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   333
        AC_DEFINE_UNQUOTED(LOAD_TIF_DYNAMIC, "$tif_lib")
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   334
    else
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   335
        if test x$have_libjpeg = xyes; then
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   336
            # Disable dynamic jpeg since we're linking it explicitly
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   337
            jpg_lib=''
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   338
        fi
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   339
        IMG_LIBS="-ltiff -lz $IMG_LIBS"
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   340
    fi
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   341
fi
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   342
if test x$enable_jpg = xyes -a x$have_jpg_hdr = xyes -a x$have_jpg_lib = xyes; then
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   343
    if test x$enable_jpg_shared = xyes && test x$jpg_lib != x; then
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   344
        echo "-- dynamic libjpeg -> $jpg_lib"
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   345
        AC_DEFINE_UNQUOTED(LOAD_JPG_DYNAMIC, "$jpg_lib")
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   346
    else
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   347
        IMG_LIBS="-ljpeg $IMG_LIBS"
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   348
    fi
slouken@143
   349
fi
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   350
if test x$enable_png = xyes -a x$have_png_hdr = xyes -a x$have_png_lib = xyes; then
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   351
    if test x$enable_png_shared = xyes && test x$png_lib != x; then
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   352
        echo "-- dynamic libpng -> $png_lib"
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   353
        AC_DEFINE_UNQUOTED(LOAD_PNG_DYNAMIC, "$png_lib")
slouken@143
   354
    else
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   355
        IMG_LIBS="-lpng -lz $IMG_LIBS"
slouken@143
   356
    fi
slouken@143
   357
fi
slouken@143
   358
slouken@137
   359
LIBS="$saved_LIBS"
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   360
slouken@168
   361
AC_SUBST([WINDRES])
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   362
AC_SUBST([IMG_LIBS])
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   363
slouken@279
   364
OBJCFLAGS=$CFLAGS
slouken@279
   365
slouken@0
   366
# Finally create all the generated files
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   367
AC_OUTPUT([
slouken@0
   368
Makefile
slouken@321
   369
SDL2_image.spec
slouken@321
   370
SDL2_image.pc
slouken@0
   371
])