1# configure.ac 2 3dnl Process this file with autoconf to produce a configure script. 4dnl 5dnl Minor upgrades (compatible ABI): increment the package version 6dnl (third field in two places below) and set the PNGLIB_RELEASE 7dnl variable. 8dnl 9dnl Major upgrades (incompatible ABI): increment the package major 10dnl version (second field, or first if desired), set the minor 11dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in 12dnl Makefile.am to upgrade the package name. 13 14dnl This is here to prevent earlier autoconf from being used, it 15dnl should not be necessary to regenerate configure if the time 16dnl stamps are correct 17AC_PREREQ([2.68]) 18 19dnl Version number stuff here: 20 21AC_INIT([libpng],[1.6.22beta03],[png-mng-implement@lists.sourceforge.net]) 22AC_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 30AM_INIT_AUTOMAKE([1.13 foreign dist-xz color-tests silent-rules subdir-objects]) 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 34AM_MAINTAINER_MODE 35 36dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later 37dnl version; aclocal.m4 will generate a failure if you use a prior version of 38dnl automake, so the following is not necessary (and is not defined anyway): 39dnl AM_PREREQ([1.11.2]) 40dnl stop configure from automagically running automake 41 42PNGLIB_VERSION=1.6.22beta03 43PNGLIB_MAJOR=1 44PNGLIB_MINOR=6 45PNGLIB_RELEASE=22 46 47dnl End of version number stuff 48 49AC_CONFIG_SRCDIR([pngget.c]) 50AC_CONFIG_HEADERS([config.h]) 51 52# Checks for programs. 53AC_LANG([C]) 54AC_PROG_CC 55AM_PROG_AS 56LT_PATH_LD 57AC_PROG_CPP 58AC_PROG_AWK 59AC_PROG_INSTALL 60AC_PROG_LN_S 61AC_PROG_MAKE_SET 62 63dnl libtool/libtoolize; version 2.4.2 is the tested version, this or any 64dnl compatible later version may be used 65LT_INIT([win32-dll]) 66LT_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 70AC_MSG_CHECKING([that AWK works]) 71if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\ 72 ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\ 73 ${srcdir}/pngusr.dfa 1>&2 74then 75 AC_MSG_RESULT([ok]) 76else 77 AC_MSG_FAILURE([failed], 1) 78fi 79 80# This is a remnant of the old cc -E validation, where it may have been 81# necessary to use a different preprocessor for .dfn files 82DFNCPP="$CPP" 83AC_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 88AC_ARG_VAR(PNG_COPTS, 89 [additional flags for the C compiler, use this for options that would] 90 [cause configure itself to fail]) 91AC_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. 111AC_HEADER_STDC 112 113# Checks for typedefs, structures, and compiler characteristics. 114AC_C_CONST 115AC_TYPE_SIZE_T 116AC_STRUCT_TM 117AC_C_RESTRICT 118 119# Checks for library functions. 120AC_FUNC_STRTOD 121AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc)) 122AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) ) 123AC_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_']) 128AC_CHECK_LIB(z, zlibVersion, , 129 AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed))) 130 131# The following is for pngvalid, to ensure it catches FP errors even on 132# platforms that don't enable FP exceptions, the function appears in the math 133# library (typically), it's not an error if it is not found. 134AC_CHECK_LIB([m], [feenableexcept]) 135AC_CHECK_FUNCS([feenableexcept]) 136 137AC_MSG_CHECKING([if using Solaris linker]) 138SLD=`$LD --version 2>&1 | grep Solaris` 139if test "$SLD"; then 140 have_solaris_ld=yes 141 AC_MSG_RESULT(yes) 142else 143 have_solaris_ld=no 144 AC_MSG_RESULT(no) 145fi 146AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes") 147 148AC_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. 152case $host in 153*cygwin* | *mingw32* | *interix* ) 154 have_ld_version_script=no 155 AC_MSG_RESULT(no) 156;; 157* ) 158 159if test "$have_solaris_ld" = "yes"; then 160 GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'` 161else 162 GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script` 163fi 164 165if test "$GLD"; then 166 have_ld_version_script=yes 167 AC_MSG_RESULT(yes) 168else 169 have_ld_version_script=no 170 AC_MSG_RESULT(no) 171 AC_MSG_WARN(*** You have not enabled versioned symbols.) 172fi 173;; 174esac 175 176AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") 177 178if 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) 186fi 187 188# Substitutions for .in files 189AC_SUBST(PNGLIB_VERSION) 190AC_SUBST(PNGLIB_MAJOR) 191AC_SUBST(PNGLIB_MINOR) 192AC_SUBST(PNGLIB_RELEASE) 193 194# Additional arguments (and substitutions) 195# Allow the pkg-config directory to be set 196AC_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 202AC_SUBST([pkgconfigdir]) 203AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]]) 204 205# Make the *-config binary config scripts optional 206AC_ARG_WITH(binconfigs, 207 AS_HELP_STRING([[[--with-binconfigs]]], 208 [Generate shell libpng-config scripts as well as pkg-config data] 209 [@<:@default=yes@:>@]), 210 [if test "${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}']) 217AC_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 221AC_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]) 227AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"]) 228 229# Control over what links are made for installed files. Versioned files are 230# always installed, when the following options are turned on corresponding 231# unversioned links are also created (normally as symbolic links): 232AC_ARG_ENABLE([unversioned-links], 233 AS_HELP_STRING([[[--enable-unversioned-links]]], 234 [Installed libpng header files are placed in a versioned subdirectory] 235 [and installed libpng library (including DLL) files are versioned.] 236 [If this option is enabled unversioned links will be created pointing to] 237 [the corresponding installed files. If you use libpng.pc or] 238 [libpng-config for all builds you do not need these links, but if you] 239 [compile programs directly they will typically #include <png.h> and] 240 [link with -lpng; in that case you need the links.] 241 [The links can be installed manually using 'make install-header-links'] 242 [and 'make install-library-links' and can be removed using the] 243 [corresponding uninstall- targets. If you do enable this option every] 244 [libpng 'make install' will recreate the links to point to the just] 245 [installed version of libpng. The default is to create the links;] 246 [use --disable-unversioned-links to change this])) 247 248# The AM_CONDITIONAL test is written so that the default is enabled; 249# --disable-unversioned-links must be given to turn the option off. 250AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"]) 251 252AC_ARG_ENABLE([unversioned-libpng-pc], 253 AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]], 254 [Install the configuration file 'libpng.pc' as a link to the versioned] 255 [version. This is done by default - use --disable-unversioned-libpng-pc] 256 [to change this.])) 257AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC], 258 [test "$enable_unversioned_libpng_pc" != "no"]) 259 260AC_ARG_ENABLE([unversioned-libpng-config], 261 AS_HELP_STRING([[[--enable-unversioned-libpng-config]]], 262 [Install the configuration file 'libpng-config' as a link to the] 263 [versioned version. This is done by default - use] 264 [--disable-unversioned-libpng-config to change this.])) 265AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG], 266 [test "$enable_unversioned_libpng_config" != "no"]) 267 268# HOST SPECIFIC OPTIONS 269# ===================== 270# 271# ARM 272# === 273# 274# ARM NEON (SIMD) support. 275 276AC_ARG_ENABLE([arm-neon], 277 AS_HELP_STRING([[[--enable-arm-neon]]], 278 [Enable ARM NEON optimizations: =no/off, check, api, yes/on:] 279 [no/off: disable the optimizations; check: use internal checking code] 280 [(deprecated and poorly supported); api: disable by default, enable by] 281 [a call to png_set_option; yes/on: turn on unconditionally.] 282 [If not specified: determined by the compiler.]), 283 [case "$enableval" in 284 no|off) 285 # disable the default enabling on __ARM_NEON__ systems: 286 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 287 [Disable ARM Neon optimizations]) 288 # Prevent inclusion of the assembler files below: 289 enable_arm_neon=no;; 290 check) 291 AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [], 292 [Check for ARM Neon support at run-time]);; 293 api) 294 AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [], 295 [Turn on ARM Neon optimizations at run-time]);; 296 yes|on) 297 AC_DEFINE([PNG_ARM_NEON_OPT], [2], 298 [Enable ARM Neon optimizations]) 299 AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if] 300 [you want the optimizations unconditionally pass -mfpu=neon] 301 [to the compiler.]);; 302 *) 303 AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value]) 304 esac]) 305 306# Add ARM specific files to all builds where the host_cpu is arm ('arm*') or 307# where ARM optimizations were explicitly requested (this allows a fallback if a 308# future host CPU does not match 'arm*') 309 310AM_CONDITIONAL([PNG_ARM_NEON], 311 [test "$enable_arm_neon" != 'no' && 312 case "$host_cpu" in 313 arm*|aarch64*) :;; 314 *) test "$enable_arm_neon" != '';; 315 esac]) 316 317AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]]) 318 319# Config files, substituting as above 320AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in]) 321AC_CONFIG_FILES([libpng-config:libpng-config.in], 322 [chmod +x libpng-config]) 323 324AC_OUTPUT 325