1 # configure.ac 2 3 # Copyright (c) 2004-2016 Glenn Randers-Pehrson 4 # Last changed in libpng 1.6.25 [September 1, 2016] 5 6 # This code is released under the libpng license. 7 # For conditions of distribution and use, see the disclaimer 8 # and license in png.h 9 10 dnl Process this file with autoconf to produce a configure script. 11 dnl 12 dnl Minor upgrades (compatible ABI): increment the package version 13 dnl (third field in two places below) and set the PNGLIB_RELEASE 14 dnl variable. 15 dnl 16 dnl Major upgrades (incompatible ABI): increment the package major 17 dnl version (second field, or first if desired), set the minor 18 dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in 19 dnl Makefile.am to upgrade the package name. 20 21 dnl This is here to prevent earlier autoconf from being used, it 22 dnl should not be necessary to regenerate configure if the time 23 dnl stamps are correct 24 AC_PREREQ([2.68]) 25 26 dnl Version number stuff here: 27 28 AC_INIT([libpng],[1.6.25],[png-mng-implement (a] lists.sourceforge.net]) 29 AC_CONFIG_MACRO_DIR([scripts]) 30 31 # libpng does not follow GNU file name conventions (hence 'foreign') 32 # color-tests requires automake 1.11 or later 33 # silent-rules requires automake 1.11 or later 34 # dist-xz requires automake 1.11 or later 35 # 1.12.2 fixes a security issue in 1.11.2 and 1.12.1 36 # 1.13 is required for parallel tests 37 AM_INIT_AUTOMAKE([1.13 foreign dist-xz color-tests silent-rules subdir-objects]) 38 # The following line causes --disable-maintainer-mode to be the default to 39 # configure. This is necessary because libpng distributions cannot rely on the 40 # time stamps of the autotools generated files being correct 41 AM_MAINTAINER_MODE 42 43 dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later 44 dnl version; aclocal.m4 will generate a failure if you use a prior version of 45 dnl automake, so the following is not necessary (and is not defined anyway): 46 dnl AM_PREREQ([1.11.2]) 47 dnl stop configure from automagically running automake 48 49 PNGLIB_VERSION=1.6.25 50 PNGLIB_MAJOR=1 51 PNGLIB_MINOR=6 52 PNGLIB_RELEASE=25 53 54 dnl End of version number stuff 55 56 AC_CONFIG_SRCDIR([pngget.c]) 57 AC_CONFIG_HEADERS([config.h]) 58 59 # Checks for programs. 60 AC_LANG([C]) 61 AC_PROG_CC 62 AM_PROG_AS 63 LT_PATH_LD 64 AC_PROG_CPP 65 AC_PROG_AWK 66 AC_PROG_INSTALL 67 AC_PROG_LN_S 68 AC_PROG_MAKE_SET 69 70 dnl libtool/libtoolize; version 2.4.2 is the tested version. This or any 71 dnl compatible later version may be used 72 LT_INIT([win32-dll]) 73 LT_PREREQ([2.4.2]) 74 75 # Some awks crash when confronted with pnglibconf.dfa, do a test run now 76 # to make sure this doesn't happen 77 AC_MSG_CHECKING([that AWK works]) 78 if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\ 79 ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\ 80 ${srcdir}/pngusr.dfa 1>&2 81 then 82 AC_MSG_RESULT([ok]) 83 else 84 AC_MSG_FAILURE([failed], 1) 85 fi 86 87 # This is a remnant of the old cc -E validation, where it may have been 88 # necessary to use a different preprocessor for .dfn files 89 DFNCPP="$CPP" 90 AC_SUBST(DFNCPP) 91 92 # -Werror cannot be passed to GCC in CFLAGS because configure will fail (it 93 # checks the compiler with a program that generates a warning), add the 94 # following option to deal with this 95 AC_ARG_VAR(PNG_COPTS, 96 [additional flags for the C compiler, use this for options that would] 97 [cause configure itself to fail]) 98 AC_ARG_ENABLE(werror, 99 AS_HELP_STRING([[[--enable-werror[=OPT]]]], 100 [Pass -Werror or the given argument to the compiler if it is supported]), 101 [test "$enable_werror" = "yes" && enable_werror="-Werror" 102 if test "$enable_werror" != "no"; then 103 sav_CFLAGS="$CFLAGS" 104 CFLAGS="$enable_werror $CFLAGS" 105 AC_MSG_CHECKING([if the compiler allows $enable_werror]) 106 AC_COMPILE_IFELSE( 107 [AC_LANG_SOURCE([ 108 [int main(int argc, char **argv){] 109 [return argv[argc-1][0];] 110 [}]])], 111 AC_MSG_RESULT(yes) 112 PNG_COPTS="$PNG_COPTS $enable_werror", 113 AC_MSG_RESULT(no)) 114 CFLAGS="$sav_CFLAGS" 115 fi],) 116 117 # For GCC 5 the default mode for C is -std=gnu11 instead of -std=gnu89 118 # In pngpriv.h we request just the POSIX 1003.1 and C89 APIs by defining _POSIX_SOURCE to 1 119 # This is incompatible with the new default mode, so we test for that and force the 120 # "-std=c89" compiler option: 121 AC_MSG_CHECKING([if we need to force back C standard to C89]) 122 AC_COMPILE_IFELSE( 123 [AC_LANG_PROGRAM([ 124 [#define _POSIX_SOURCE 1] 125 [#include <stdio.h>] 126 ])], 127 AC_MSG_RESULT(no),[ 128 if test "x$GCC" != "xyes"; then 129 AC_MSG_ERROR( 130 [Forcing back to C89 is required but the flags are only known for GCC]) 131 fi 132 AC_MSG_RESULT(yes) 133 CFLAGS="$CFLAGS -std=c89" 134 ]) 135 136 # Checks for header files. 137 AC_HEADER_STDC 138 139 # Checks for typedefs, structures, and compiler characteristics. 140 AC_C_CONST 141 AC_TYPE_SIZE_T 142 AC_STRUCT_TM 143 AC_C_RESTRICT 144 145 # Checks for library functions. 146 AC_FUNC_STRTOD 147 AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc)) 148 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) ) 149 150 # Some later POSIX 1003.1 functions are required for test programs, failure here 151 # is soft (the corresponding test program is not built). 152 AC_CHECK_FUNC([clock_gettime],,[AC_MSG_WARN([not building timepng])]) 153 AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"]) 154 155 AC_ARG_WITH(zlib-prefix, 156 AS_HELP_STRING([[[--with-zlib-prefix]]], 157 [prefix that may have been used in installed zlib]), 158 [ZPREFIX=${withval}], 159 [ZPREFIX='z_']) 160 AC_CHECK_LIB(z, zlibVersion, , 161 AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed))) 162 163 # The following is for pngvalid, to ensure it catches FP errors even on 164 # platforms that don't enable FP exceptions, the function appears in the math 165 # library (typically), it's not an error if it is not found. 166 AC_CHECK_LIB([m], [feenableexcept]) 167 AC_CHECK_FUNCS([feenableexcept]) 168 169 AC_MSG_CHECKING([if using Solaris linker]) 170 SLD=`$LD --version 2>&1 | grep Solaris` 171 if test "$SLD"; then 172 have_solaris_ld=yes 173 AC_MSG_RESULT(yes) 174 else 175 have_solaris_ld=no 176 AC_MSG_RESULT(no) 177 fi 178 AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes") 179 180 AC_MSG_CHECKING([if libraries can be versioned]) 181 # Special case for PE/COFF platforms: ld reports 182 # support for version-script, but doesn't actually 183 # DO anything with it. 184 case $host in 185 *cygwin* | *mingw32* | *interix* ) 186 have_ld_version_script=no 187 AC_MSG_RESULT(no) 188 ;; 189 * ) 190 191 if test "$have_solaris_ld" = "yes"; then 192 GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'` 193 else 194 GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script` 195 fi 196 197 if test "$GLD"; then 198 have_ld_version_script=yes 199 AC_MSG_RESULT(yes) 200 else 201 have_ld_version_script=no 202 AC_MSG_RESULT(no) 203 AC_MSG_WARN(*** You have not enabled versioned symbols.) 204 fi 205 ;; 206 esac 207 208 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") 209 210 if test "$have_ld_version_script" = "yes"; then 211 AC_MSG_CHECKING([for symbol prefix]) 212 SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \ 213 | ${CPP-${CC-gcc} -E} - 2>&1 \ 214 | ${EGREP-grep} "^PREFIX=" \ 215 | ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"` 216 AC_SUBST(SYMBOL_PREFIX) 217 AC_MSG_RESULT($SYMBOL_PREFIX) 218 fi 219 220 # Substitutions for .in files 221 AC_SUBST(PNGLIB_VERSION) 222 AC_SUBST(PNGLIB_MAJOR) 223 AC_SUBST(PNGLIB_MINOR) 224 AC_SUBST(PNGLIB_RELEASE) 225 226 # Additional arguments (and substitutions) 227 # Allow the pkg-config directory to be set 228 AC_ARG_WITH(pkgconfigdir, 229 AS_HELP_STRING([[[--with-pkgconfigdir]]], 230 [Use the specified pkgconfig dir (default is libdir/pkgconfig)]), 231 [pkgconfigdir=${withval}], 232 [pkgconfigdir='${libdir}/pkgconfig']) 233 234 AC_SUBST([pkgconfigdir]) 235 AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]]) 236 237 # Make the *-config binary config scripts optional 238 AC_ARG_WITH(binconfigs, 239 AS_HELP_STRING([[[--with-binconfigs]]], 240 [Generate shell libpng-config scripts as well as pkg-config data] 241 [@<:@default=yes@:>@]), 242 [if test "${withval}" = no; then 243 binconfigs= 244 AC_MSG_NOTICE([[libpng-config scripts will not be built]]) 245 else 246 binconfigs='${binconfigs}' 247 fi], 248 [binconfigs='${binconfigs}']) 249 AC_SUBST([binconfigs]) 250 251 # Support for prefixes to the API function names; this will generate defines 252 # at the start of the build to rename exported library functions 253 AC_ARG_WITH(libpng-prefix, 254 AS_HELP_STRING([[[--with-libpng-prefix]]], 255 [prefix libpng exported function (API) names with the given value]), 256 [if test "${withval:-no}" != "no"; then 257 AC_SUBST([PNG_PREFIX], [${withval}]) 258 fi]) 259 AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"]) 260 261 # Control over what links are made for installed files. Versioned files are 262 # always installed, when the following options are turned on corresponding 263 # unversioned links are also created (normally as symbolic links): 264 AC_ARG_ENABLE([unversioned-links], 265 AS_HELP_STRING([[[--enable-unversioned-links]]], 266 [Installed libpng header files are placed in a versioned subdirectory] 267 [and installed libpng library (including DLL) files are versioned.] 268 [If this option is enabled unversioned links will be created pointing to] 269 [the corresponding installed files. If you use libpng.pc or] 270 [libpng-config for all builds you do not need these links, but if you] 271 [compile programs directly they will typically #include <png.h> and] 272 [link with -lpng; in that case you need the links.] 273 [The links can be installed manually using 'make install-header-links'] 274 [and 'make install-library-links' and can be removed using the] 275 [corresponding uninstall- targets. If you do enable this option every] 276 [libpng 'make install' will recreate the links to point to the just] 277 [installed version of libpng. The default is to create the links;] 278 [use --disable-unversioned-links to change this])) 279 280 # The AM_CONDITIONAL test is written so that the default is enabled; 281 # --disable-unversioned-links must be given to turn the option off. 282 AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"]) 283 284 AC_ARG_ENABLE([unversioned-libpng-pc], 285 AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]], 286 [Install the configuration file 'libpng.pc' as a link to the versioned] 287 [version. This is done by default - use --disable-unversioned-libpng-pc] 288 [to change this.])) 289 AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC], 290 [test "$enable_unversioned_libpng_pc" != "no"]) 291 292 AC_ARG_ENABLE([unversioned-libpng-config], 293 AS_HELP_STRING([[[--enable-unversioned-libpng-config]]], 294 [Install the configuration file 'libpng-config' as a link to the] 295 [versioned version. This is done by default - use] 296 [--disable-unversioned-libpng-config to change this.])) 297 AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG], 298 [test "$enable_unversioned_libpng_config" != "no"]) 299 300 # HOST SPECIFIC OPTIONS 301 # ===================== 302 # 303 # ARM 304 # === 305 # 306 # ARM NEON (SIMD) support. 307 308 AC_ARG_ENABLE([arm-neon], 309 AS_HELP_STRING([[[--enable-arm-neon]]], 310 [Enable ARM NEON optimizations: =no/off, check, api, yes/on:] 311 [no/off: disable the optimizations; check: use internal checking code] 312 [(deprecated and poorly supported); api: disable by default, enable by] 313 [a call to png_set_option; yes/on: turn on unconditionally.] 314 [If not specified: determined by the compiler.]), 315 [case "$enableval" in 316 no|off) 317 # disable the default enabling on __ARM_NEON__ systems: 318 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 319 [Disable ARM Neon optimizations]) 320 # Prevent inclusion of the assembler files below: 321 enable_arm_neon=no;; 322 check) 323 AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [], 324 [Check for ARM Neon support at run-time]);; 325 api) 326 AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [], 327 [Turn on ARM Neon optimizations at run-time]);; 328 yes|on) 329 AC_DEFINE([PNG_ARM_NEON_OPT], [2], 330 [Enable ARM Neon optimizations]) 331 AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if] 332 [you want the optimizations unconditionally pass -mfpu=neon] 333 [to the compiler.]);; 334 *) 335 AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value]) 336 esac]) 337 338 # Add ARM specific files to all builds where the host_cpu is arm ('arm*') or 339 # where ARM optimizations were explicitly requested (this allows a fallback if a 340 # future host CPU does not match 'arm*') 341 342 AM_CONDITIONAL([PNG_ARM_NEON], 343 [test "$enable_arm_neon" != 'no' && 344 case "$host_cpu" in 345 arm*|aarch64*) :;; 346 *) test "$enable_arm_neon" != '';; 347 esac]) 348 349 # MIPS 350 # === 351 # 352 # MIPS MSA (SIMD) support. 353 354 AC_ARG_ENABLE([mips-msa], 355 AS_HELP_STRING([[[--enable-mips-msa]]], 356 [Enable MIPS MSA optimizations: =no/off, check, api, yes/on:] 357 [no/off: disable the optimizations; check: use internal checking code] 358 [(deprecated and poorly supported); api: disable by default, enable by] 359 [a call to png_set_option; yes/on: turn on unconditionally.] 360 [If not specified: determined by the compiler.]), 361 [case "$enableval" in 362 no|off) 363 # disable the default enabling on __mips_msa systems: 364 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 365 [Disable MIPS MSA optimizations]) 366 # Prevent inclusion of the assembler files below: 367 enable_mips_msa=no;; 368 check) 369 AC_DEFINE([PNG_MIPS_MSA_CHECK_SUPPORTED], [], 370 [Check for MIPS MSA support at run-time]);; 371 api) 372 AC_DEFINE([PNG_MIPS_MSA_API_SUPPORTED], [], 373 [Turn on MIPS MSA optimizations at run-time]);; 374 yes|on) 375 AC_DEFINE([PNG_MIPS_MSA_OPT], [2], 376 [Enable MIPS MSA optimizations]) 377 AC_MSG_WARN([--enable-mips-msa: please specify 'check' or 'api', if] 378 [you want the optimizations unconditionally pass '-mmsa -mfp64'] 379 [to the compiler.]);; 380 *) 381 AC_MSG_ERROR([--enable-mips-msa=${enable_mips_msa}: invalid value]) 382 esac]) 383 384 # Add MIPS specific files to all builds where the host_cpu is mips ('mips*') or 385 # where MIPS optimizations were explicitly requested (this allows a fallback if a 386 # future host CPU does not match 'mips*') 387 388 AM_CONDITIONAL([PNG_MIPS_MSA], 389 [test "$enable_mips_msa" != 'no' && 390 case "$host_cpu" in 391 mipsel*|mips64el*) :;; 392 esac]) 393 394 # INTEL 395 # ===== 396 # 397 # INTEL SSE (SIMD) support. 398 399 AC_ARG_ENABLE([intel-sse], 400 AS_HELP_STRING([[[--enable-intel-sse]]], 401 [Enable Intel SSE optimizations: =no/off, yes/on:] 402 [no/off: disable the optimizations;] 403 [yes/on: enable the optimizations.] 404 [If not specified: determined by the compiler.]), 405 [case "$enableval" in 406 no|off) 407 # disable the default enabling: 408 AC_DEFINE([PNG_INTEL_SSE_OPT], [0], 409 [Disable Intel SSE optimizations]) 410 # Prevent inclusion of the assembler files below: 411 enable_intel_sse=no;; 412 yes|on) 413 AC_DEFINE([PNG_INTEL_SSE_OPT], [1], 414 [Enable Intel SSE optimizations]);; 415 *) 416 AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value]) 417 esac]) 418 419 # Add Intel specific files to all builds where the host_cpu is Intel ('x86*') 420 # or where Intel optimizations were explicitly requested (this allows a 421 # fallback if a future host CPU does not match 'x86*') 422 AM_CONDITIONAL([PNG_INTEL_SSE], 423 [test "$enable_intel_sse" != 'no' && 424 case "$host_cpu" in 425 i?86|x86_64) :;; 426 *) test "$enable_intel_sse" != '';; 427 esac]) 428 429 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]]) 430 431 # Config files, substituting as above 432 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in]) 433 AC_CONFIG_FILES([libpng-config:libpng-config.in], 434 [chmod +x libpng-config]) 435 436 AC_OUTPUT 437
