src/png/configure.ac

   1 # configure.ac
   2
   3 dnl Process this file with autoconf to produce a configure script.
   4 dnl
   5 dnl Minor upgrades (compatible ABI): increment the package version
   6 dnl (third field in two places below) and set the PNGLIB_RELEASE
   7 dnl variable.
   8 dnl
   9 dnl Major upgrades (incompatible ABI): increment the package major
  10 dnl version (second field, or first if desired), set the minor
  11 dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in
  12 dnl Makefile.am to upgrade the package name.
  13
  14 dnl This is here to prevent earlier autoconf from being used, it
  15 dnl should not be necessary to regenerate configure if the time
  16 dnl stamps are correct
  17 AC_PREREQ([2.68])
  18
  19 dnl Version number stuff here:
  20
  21 AC_INIT([libpng],[1.6.2],[png-mng-implement@lists.sourceforge.net])
  22 AC_CONFIG_MACRO_DIR([scripts])
  23
  24 # libpng does not follow GNU file name conventions (hence 'foreign')
  25 # color-tests requires automake 1.11 or later
  26 # silent-rules requires automake 1.11 or later
  27 # dist-xz requires automake 1.11 or later
  28 # 1.12.2 fixes a security issue in 1.11.2 and 1.12.1
  29 # 1.13 is required for parallel tests
  30 AM_INIT_AUTOMAKE([1.13 foreign dist-xz color-tests silent-rules])
  31 # The following line causes --disable-maintainer-mode to be the default to
  32 # configure, this is necessary because libpng distributions cannot rely on the
  33 # time stamps of the autotools generated files being correct
  34 AM_MAINTAINER_MODE
  35
  36 dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later
  37 dnl version; aclocal.m4 will generate a failure if you use a prior version of
  38 dnl automake, so the following is not necessary (and is not defined anyway):
  39 dnl AM_PREREQ([1.11.2])
  40 dnl stop configure from automagically running automake
  41
  42 PNGLIB_VERSION=1.6.2
  43 PNGLIB_MAJOR=1
  44 PNGLIB_MINOR=6
  45 PNGLIB_RELEASE=2
  46
  47 dnl End of version number stuff
  48
  49 AC_CONFIG_SRCDIR([pngget.c])
  50 AC_CONFIG_HEADERS([config.h])
  51
  52 # Checks for programs.
  53 AC_LANG([C])
  54 AC_PROG_CC
  55 AM_PROG_AS
  56 LT_PATH_LD
  57 AC_PROG_CPP
  58 AC_PROG_AWK
  59 AC_PROG_INSTALL
  60 AC_PROG_LN_S
  61 AC_PROG_MAKE_SET
  62
  63 dnl libtool/libtoolize; version 2.4.2 is the tested version, this or any
  64 dnl compatible later version may be used
  65 LT_INIT([win32-dll])
  66 LT_PREREQ([2.4.2])
  67
  68 # Some awks crash when confronted with pnglibconf.dfa, do a test run now
  69 # to make sure this doesn't happen
  70 AC_MSG_CHECKING([that AWK works])
  71 if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\
  72    ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
  73    ${srcdir}/pngusr.dfa 1>&2
  74 then
  75    AC_MSG_RESULT([ok])
  76 else
  77    AC_MSG_FAILURE([failed], 1)
  78 fi
  79
  80 # This is a remnant of the old cc -E validation, where it may have been
  81 # necessary to use a different preprocessor for .dfn files
  82 DFNCPP="$CPP"
  83 AC_SUBST(DFNCPP)
  84
  85 # -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
  86 # checks the compiler with a program that generates a warning), add the
  87 # following option to deal with this
  88 AC_ARG_VAR(PNG_COPTS,
  89    [additional flags for the C compiler, use this for options that would]
  90    [cause configure itself to fail])
  91 AC_ARG_ENABLE(werror,
  92    AS_HELP_STRING([[[--enable-werror[=OPT]]]],
  93       [Pass -Werror or the given argument to the compiler if it is supported]),
  94    [test "$enable_werror" = "yes" && enable_werror="-Werror"
  95     if test "$enable_werror" != "no"; then
  96       sav_CFLAGS="$CFLAGS"
  97       CFLAGS="$enable_werror $CFLAGS"
  98       AC_MSG_CHECKING([if the compiler allows $enable_werror])
  99       AC_COMPILE_IFELSE(
 100          [AC_LANG_SOURCE([
 101             [int main(int argc, char **argv){]
 102             [return argv[argc-1][0];]
 103             [}]])],
 104          AC_MSG_RESULT(yes)
 105          PNG_COPTS="$PNG_COPTS $enable_werror",
 106          AC_MSG_RESULT(no))
 107       CFLAGS="$sav_CFLAGS"
 108     fi],)
 109
 110 # Checks for header files.
 111 AC_HEADER_STDC
 112
 113 # Checks for typedefs, structures, and compiler characteristics.
 114 AC_C_CONST
 115 AC_TYPE_SIZE_T
 116 AC_STRUCT_TM
 117 AC_C_RESTRICT
 118
 119 # Checks for library functions.
 120 AC_FUNC_STRTOD
 121 AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc))
 122 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) )
 123 AC_ARG_WITH(zlib-prefix,
 124    AS_HELP_STRING([[[--with-zlib-prefix]]],
 125       [prefix that may have been used in installed zlib]),
 126       [ZPREFIX=${withval}],
 127       [ZPREFIX='z_'])
 128 AC_CHECK_LIB(z, zlibVersion, ,
 129     AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed)))
 130
 131 # The following is for pngvalid, to ensure it catches FP errors even on
 132 # platforms that don't enable FP exceptions, the function appears in the math
 133 # library (typically), it's not an error if it is not found.
 134 AC_CHECK_LIB([m], [feenableexcept])
 135 AC_CHECK_FUNCS([feenableexcept])
 136
 137 AC_MSG_CHECKING([if using Solaris linker])
 138 SLD=`$LD --version 2>&1 | grep Solaris`
 139 if test "$SLD"; then
 140     have_solaris_ld=yes
 141     AC_MSG_RESULT(yes)
 142 else
 143     have_solaris_ld=no
 144     AC_MSG_RESULT(no)
 145 fi
 146 AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
 147
 148 AC_MSG_CHECKING([if libraries can be versioned])
 149 # Special case for PE/COFF platforms: ld reports
 150 # support for version-script, but doesn't actually
 151 # DO anything with it.
 152 case $host in
 153 *cygwin* | *mingw32* | *interix* )
 154     have_ld_version_script=no
 155     AC_MSG_RESULT(no)
 156 ;;
 157 * )
 158
 159 if test "$have_solaris_ld" = "yes"; then
 160     GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
 161 else
 162     GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
 163 fi
 164
 165 if test "$GLD"; then
 166     have_ld_version_script=yes
 167     AC_MSG_RESULT(yes)
 168 else
 169     have_ld_version_script=no
 170     AC_MSG_RESULT(no)
 171     AC_MSG_WARN(*** You have not enabled versioned symbols.)
 172 fi
 173 ;;
 174 esac
 175
 176 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
 177
 178 if test "$have_ld_version_script" = "yes"; then
 179     AC_MSG_CHECKING([for symbol prefix])
 180     SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
 181                   | ${CPP-${CC-gcc} -E} - 2>&1 \
 182                   | ${EGREP-grep} "^PREFIX=" \
 183                   | ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
 184     AC_SUBST(SYMBOL_PREFIX)
 185     AC_MSG_RESULT($SYMBOL_PREFIX)
 186 fi
 187
 188 # Substitutions for .in files
 189 AC_SUBST(PNGLIB_VERSION)
 190 AC_SUBST(PNGLIB_MAJOR)
 191 AC_SUBST(PNGLIB_MINOR)
 192 AC_SUBST(PNGLIB_RELEASE)
 193
 194 # Additional arguments (and substitutions)
 195 # Allow the pkg-config directory to be set
 196 AC_ARG_WITH(pkgconfigdir,
 197    AS_HELP_STRING([[[--with-pkgconfigdir]]],
 198       [Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
 199    [pkgconfigdir=${withval}],
 200    [pkgconfigdir='${libdir}/pkgconfig'])
 201
 202 AC_SUBST([pkgconfigdir])
 203 AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])
 204
 205 # Make the *-config binary config scripts optional
 206 AC_ARG_WITH(binconfigs,
 207    AS_HELP_STRING([[[--with-binconfigs]]],
 208       [Generate shell libpng-config scripts as well as pkg-config data]
 209       [@<:@default=yes@:>@]),
 210    [if test "${withval}" = no; then
 211       binconfigs=
 212       AC_MSG_NOTICE([[libpng-config scripts will not be built]])
 213     else
 214       binconfigs='${binconfigs}'
 215     fi],
 216    [binconfigs='${binconfigs}'])
 217 AC_SUBST([binconfigs])
 218
 219 # Support for prefixes to the API function names; this will generate defines
 220 # at the start of the build to rename exported library functions
 221 AC_ARG_WITH(libpng-prefix,
 222    AS_HELP_STRING([[[--with-libpng-prefix]]],
 223       [prefix libpng exported function (API) names with the given value]),
 224    [if test "${withval:-no}" != "no"; then
 225       AC_SUBST([PNG_PREFIX], [${withval}])
 226     fi])
 227 AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
 228
 229 # Because GCC by default assembles code with an executable stack, even though it
 230 # compiles C code with a non-executable stack, it is necessary to do a fixup
 231 # here (this may by GCC specific)
 232 # AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])
 233
 234 AC_ARG_ENABLE([arm-neon],
 235    AS_HELP_STRING([[[--enable-arm-neon]]],
 236       [Enable ARM NEON optimizations: =off, check, api, on:]
 237       [off: disable the optimizations; check: use internal checking code]
 238       [(deprecated and poorly supported); api: disable by default, enable by]
 239       [a call to png_set_option; on: turn on unconditionally.  The]
 240       [default is 'on' if __ARM_NEON__ is defined, otherwise 'off'.]),
 241    [case "$enableval" in
 242       off)
 243          AC_DEFINE([PNG_NO_ARM_NEON], [],
 244                    [Disable ARM Neon optimizations]);;
 245       check)
 246          AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
 247                    [Check for ARM Neon support at run-time]);;
 248       api)
 249          AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
 250                    [Turn on ARM Neon optimizations at run-time]);;
 251       on)
 252          AC_DEFINE([PNG_ARM_NEON_SUPPORTED], [],
 253                    [Enable ARM Neon optimizations]);;
 254       *)
 255          AC_MSG_ERROR([arm-neon: option value required (off/check/api/on)]);;
 256    esac])
 257 AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" != "no"])
 258
 259 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
 260
 261 # Config files, substituting as above
 262 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
 263 AC_CONFIG_FILES([libpng-config:libpng-config.in],
 264    [chmod +x libpng-config])
 265
 266 AC_OUTPUT