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 10dnl Process this file with autoconf to produce a configure script. 11dnl 12dnl Minor upgrades (compatible ABI): increment the package version 13dnl (third field in two places below) and set the PNGLIB_RELEASE 14dnl variable. 15dnl 16dnl Major upgrades (incompatible ABI): increment the package major 17dnl version (second field, or first if desired), set the minor 18dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in 19dnl Makefile.am to upgrade the package name. 20 21dnl This is here to prevent earlier autoconf from being used, it 22dnl should not be necessary to regenerate configure if the time 23dnl stamps are correct 24AC_PREREQ([2.68]) 25 26dnl Version number stuff here: 27 28AC_INIT([libpng],[1.6.34],[png-mng-implement@lists.sourceforge.net]) 29AC_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 37AM_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 41AM_MAINTAINER_MODE 42 43dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later 44dnl version; aclocal.m4 will generate a failure if you use a prior version of 45dnl automake, so the following is not necessary (and is not defined anyway): 46dnl AM_PREREQ([1.11.2]) 47dnl stop configure from automagically running automake 48 49PNGLIB_VERSION=1.6.34 50PNGLIB_MAJOR=1 51PNGLIB_MINOR=6 52PNGLIB_RELEASE=34 53 54dnl End of version number stuff 55 56AC_CONFIG_SRCDIR([pngget.c]) 57AC_CONFIG_HEADERS([config.h]) 58 59# Checks for programs. 60AC_LANG([C]) 61AC_PROG_CC 62AM_PROG_AS 63LT_PATH_LD 64AC_PROG_CPP 65AC_PROG_AWK 66AC_PROG_INSTALL 67AC_PROG_LN_S 68AC_PROG_MAKE_SET 69 70dnl libtool/libtoolize; version 2.4.2 is the tested version. This or any 71dnl compatible later version may be used 72LT_INIT([win32-dll]) 73LT_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 77AC_MSG_CHECKING([that AWK works]) 78if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\ 79 ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\ 80 ${srcdir}/pngusr.dfa 1>&2 81then 82 AC_MSG_RESULT([ok]) 83else 84 AC_MSG_FAILURE([failed], 1) 85fi 86 87# This is a remnant of the old cc -E validation, where it may have been 88# necessary to use a different preprocessor for .dfn files 89DFNCPP="$CPP" 90AC_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 95AC_ARG_VAR(PNG_COPTS, 96 [additional flags for the C compiler, use this for options that would] 97 [cause configure itself to fail]) 98AC_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: 121AC_MSG_CHECKING([if we need to force back C standard to C89]) 122AC_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. 137AC_HEADER_STDC 138 139# Checks for typedefs, structures, and compiler characteristics. 140AC_C_CONST 141AC_TYPE_SIZE_T 142AC_STRUCT_TM 143AC_C_RESTRICT 144 145# Checks for library functions. 146AC_FUNC_STRTOD 147AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc)) 148AC_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). 152AC_CHECK_FUNC([clock_gettime],,[AC_MSG_WARN([not building timepng])]) 153AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"]) 154 155AC_ARG_WITH(zlib-prefix, 156 AS_HELP_STRING([[[--with-zlib-prefix]]], 157 [prefix that may have been used in installed zlib]), 158 [ZPREFIX=${withval}], 159 [ZPREFIX='z_']) 160AC_CHECK_LIB(z, zlibVersion, , 161 AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed))) 162 163# The following is for pngvalid, to ensure it catches FP errors even on 164# platforms that don't enable FP exceptions, the function appears in the math 165# library (typically), it's not an error if it is not found. 166AC_CHECK_LIB([m], [feenableexcept]) 167AC_CHECK_FUNCS([feenableexcept]) 168 169AC_MSG_CHECKING([if using Solaris linker]) 170SLD=`$LD --version 2>&1 | grep Solaris` 171if test "$SLD"; then 172 have_solaris_ld=yes 173 AC_MSG_RESULT(yes) 174else 175 have_solaris_ld=no 176 AC_MSG_RESULT(no) 177fi 178AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes") 179 180AC_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. 184case $host in 185*cygwin* | *mingw32* | *interix* ) 186 have_ld_version_script=no 187 AC_MSG_RESULT(no) 188;; 189* ) 190 191if test "$have_solaris_ld" = "yes"; then 192 GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'` 193else 194 GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script` 195fi 196 197if test "$GLD"; then 198 have_ld_version_script=yes 199 AC_MSG_RESULT(yes) 200else 201 have_ld_version_script=no 202 AC_MSG_RESULT(no) 203 AC_MSG_WARN(*** You have not enabled versioned symbols.) 204fi 205;; 206esac 207 208AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") 209 210if 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) 218fi 219 220# Substitutions for .in files 221AC_SUBST(PNGLIB_VERSION) 222AC_SUBST(PNGLIB_MAJOR) 223AC_SUBST(PNGLIB_MINOR) 224AC_SUBST(PNGLIB_RELEASE) 225 226# Additional arguments (and substitutions) 227# Allow the pkg-config directory to be set 228AC_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 234AC_SUBST([pkgconfigdir]) 235AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]]) 236 237# Make the *-config binary config scripts optional 238AC_ARG_WITH(binconfigs, 239 AS_HELP_STRING([[[--with-binconfigs]]], 240 [Generate shell libpng-config scripts as well as pkg-config data] 241 [@<:@default=yes@:>@]), 242 [if test "${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}']) 249AC_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 253AC_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]) 259AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"]) 260 261# Control over what links are made for installed files. Versioned files are 262# always installed, when the following options are turned on corresponding 263# unversioned links are also created (normally as symbolic links): 264AC_ARG_ENABLE([unversioned-links], 265 AS_HELP_STRING([[[--enable-unversioned-links]]], 266 [Installed libpng header files are placed in a versioned subdirectory] 267 [and installed libpng library (including DLL) files are versioned.] 268 [If this option is enabled unversioned links will be created pointing to] 269 [the corresponding installed files. If you use libpng.pc or] 270 [libpng-config for all builds you do not need these links, but if you] 271 [compile programs directly they will typically #include <png.h> and] 272 [link with -lpng; in that case you need the links.] 273 [The links can be installed manually using 'make install-header-links'] 274 [and 'make install-library-links' and can be removed using the] 275 [corresponding uninstall- targets. If you do enable this option every] 276 [libpng 'make install' will recreate the links to point to the just] 277 [installed version of libpng. The default is to create the links;] 278 [use --disable-unversioned-links to change this])) 279 280# The AM_CONDITIONAL test is written so that the default is enabled; 281# --disable-unversioned-links must be given to turn the option off. 282AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"]) 283 284AC_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.])) 289AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC], 290 [test "$enable_unversioned_libpng_pc" != "no"]) 291 292AC_ARG_ENABLE([unversioned-libpng-config], 293 AS_HELP_STRING([[[--enable-unversioned-libpng-config]]], 294 [Install the configuration file 'libpng-config' as a link to the] 295 [versioned version. This is done by default - use] 296 [--disable-unversioned-libpng-config to change this.])) 297AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG], 298 [test "$enable_unversioned_libpng_config" != "no"]) 299 300# HOST SPECIFIC OPTIONS 301# ===================== 302# 303# DEFAULT 304# ======= 305# 306AC_ARG_ENABLE([hardware-optimizations], 307 AS_HELP_STRING([[[--enable-hardware-optimizations]]], 308 [Enable hardware optimizations: =no/off, yes/on:]), 309 [case "$enableval" in 310 no|off) 311 # disable hardware optimization on all systems: 312 enable_arm_neon=no 313 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 314 [Disable ARM_NEON optimizations]) 315 enable_mips_msa=no 316 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 317 [Disable MIPS_MSA optimizations]) 318 enable_powerpc_vsx=no 319 AC_DEFINE([PNG_POWERPC_VSX_OPT], [0], 320 [Disable POWERPC VSX optimizations]) 321 enable_intel_sse=no 322 AC_DEFINE([PNG_INTEL_SSE_OPT], [0], 323 [Disable INTEL_SSE optimizations]) 324 ;; 325 *) 326 # allow enabling hardware optimization on any system: 327 case "$host_cpu" in 328 arm*|aarch64*) 329 enable_arm_neon=yes 330 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 331 [Enable ARM_NEON optimizations]) 332 ;; 333 mipsel*|mips64el*) 334 enable_mips_msa=yes 335 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 336 [Enable MIPS_MSA optimizations]) 337 ;; 338 i?86|x86_64) 339 enable_intel_sse=yes 340 AC_DEFINE([PNG_INTEL_SSE_OPT], [1], 341 [Enable Intel SSE optimizations]) 342 ;; 343 powerpc*|ppc64*) 344 enable_powerpc_vsx=yes 345 AC_DEFINE([PNG_POWERPC_VSX_OPT], [2], 346 [Enable POWERPC VSX optimizations]) 347 ;; 348 esac 349 ;; 350 esac]) 351 352# ARM 353# === 354# 355# ARM NEON (SIMD) support. 356 357AC_ARG_ENABLE([arm-neon], 358 AS_HELP_STRING([[[--enable-arm-neon]]], 359 [Enable ARM NEON optimizations: =no/off, check, api, yes/on:] 360 [no/off: disable the optimizations; check: use internal checking code] 361 [(deprecated and poorly supported); api: disable by default, enable by] 362 [a call to png_set_option; yes/on: turn on unconditionally.] 363 [If not specified: determined by the compiler.]), 364 [case "$enableval" in 365 no|off) 366 # disable the default enabling on __ARM_NEON__ systems: 367 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 368 [Disable ARM Neon optimizations]) 369 # Prevent inclusion of the assembler files below: 370 enable_arm_neon=no;; 371 check) 372 AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [], 373 [Check for ARM Neon support at run-time]);; 374 api) 375 AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [], 376 [Turn on ARM Neon optimizations at run-time]);; 377 yes|on) 378 AC_DEFINE([PNG_ARM_NEON_OPT], [2], 379 [Enable ARM Neon optimizations]) 380 AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if] 381 [you want the optimizations unconditionally pass -mfpu=neon] 382 [to the compiler.]);; 383 *) 384 AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value]) 385 esac]) 386 387# Add ARM specific files to all builds where the host_cpu is arm ('arm*') or 388# where ARM optimizations were explicitly requested (this allows a fallback if a 389# future host CPU does not match 'arm*') 390 391AM_CONDITIONAL([PNG_ARM_NEON], 392 [test "$enable_arm_neon" != 'no' && 393 case "$host_cpu" in 394 arm*|aarch64*) :;; 395 *) test "$enable_arm_neon" != '';; 396 esac]) 397 398# MIPS 399# === 400# 401# MIPS MSA (SIMD) support. 402 403AC_ARG_ENABLE([mips-msa], 404 AS_HELP_STRING([[[--enable-mips-msa]]], 405 [Enable MIPS MSA optimizations: =no/off, check, api, yes/on:] 406 [no/off: disable the optimizations; check: use internal checking code] 407 [(deprecated and poorly supported); api: disable by default, enable by] 408 [a call to png_set_option; yes/on: turn on unconditionally.] 409 [If not specified: determined by the compiler.]), 410 [case "$enableval" in 411 no|off) 412 # disable the default enabling on __mips_msa systems: 413 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 414 [Disable MIPS MSA optimizations]) 415 # Prevent inclusion of the assembler files below: 416 enable_mips_msa=no;; 417 check) 418 AC_DEFINE([PNG_MIPS_MSA_CHECK_SUPPORTED], [], 419 [Check for MIPS MSA support at run-time]);; 420 api) 421 AC_DEFINE([PNG_MIPS_MSA_API_SUPPORTED], [], 422 [Turn on MIPS MSA optimizations at run-time]);; 423 yes|on) 424 AC_DEFINE([PNG_MIPS_MSA_OPT], [2], 425 [Enable MIPS MSA optimizations]) 426 AC_MSG_WARN([--enable-mips-msa: please specify 'check' or 'api', if] 427 [you want the optimizations unconditionally pass '-mmsa -mfp64'] 428 [to the compiler.]);; 429 *) 430 AC_MSG_ERROR([--enable-mips-msa=${enable_mips_msa}: invalid value]) 431 esac]) 432 433# Add MIPS specific files to all builds where the host_cpu is mips ('mips*') or 434# where MIPS optimizations were explicitly requested (this allows a fallback if a 435# future host CPU does not match 'mips*') 436 437AM_CONDITIONAL([PNG_MIPS_MSA], 438 [test "$enable_mips_msa" != 'no' && 439 case "$host_cpu" in 440 mipsel*|mips64el*) :;; 441 esac]) 442 443# INTEL 444# ===== 445# 446# INTEL SSE (SIMD) support. 447 448AC_ARG_ENABLE([intel-sse], 449 AS_HELP_STRING([[[--enable-intel-sse]]], 450 [Enable Intel SSE optimizations: =no/off, yes/on:] 451 [no/off: disable the optimizations;] 452 [yes/on: enable the optimizations.] 453 [If not specified: determined by the compiler.]), 454 [case "$enableval" in 455 no|off) 456 # disable the default enabling: 457 AC_DEFINE([PNG_INTEL_SSE_OPT], [0], 458 [Disable Intel SSE optimizations]) 459 # Prevent inclusion of the assembler files below: 460 enable_intel_sse=no;; 461 yes|on) 462 AC_DEFINE([PNG_INTEL_SSE_OPT], [1], 463 [Enable Intel SSE optimizations]);; 464 *) 465 AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value]) 466 esac]) 467 468# Add Intel specific files to all builds where the host_cpu is Intel ('x86*') 469# or where Intel optimizations were explicitly requested (this allows a 470# fallback if a future host CPU does not match 'x86*') 471AM_CONDITIONAL([PNG_INTEL_SSE], 472 [test "$enable_intel_sse" != 'no' && 473 case "$host_cpu" in 474 i?86|x86_64) :;; 475 *) test "$enable_intel_sse" != '';; 476 esac]) 477 478# PowerPC 479# === 480# 481# PowerPC VSX (SIMD) support. 482 483AC_ARG_ENABLE([powerpc-vsx], 484AS_HELP_STRING([[[--enable-powerpc-vsx]]], 485 [Enable POWERPC VSX optimizations: =no/off, check, api, yes/on:] 486 [no/off: disable the optimizations; check: use internal checking code] 487 [api: disable by default, enable by a call to png_set_option] 488 [yes/on: turn on unconditionally.] 489 [If not specified: determined by the compiler.]), 490 [case "$enableval" in 491 no|off) 492 # disable the default enabling on __ppc64__ systems: 493 AC_DEFINE([PNG_POWERPC_VSX_OPT], [0], 494 [Disable POWERPC VSX optimizations]) 495 # Prevent inclusion of the platform specific files below: 496 enable_powerpc_vsx=no;; 497 check) 498 AC_DEFINE([PNG_POWERPC_VSX_CHECK_SUPPORTED], [], 499 [Check for POWERPC VSX support at run-time]) 500 AC_MSG_WARN([--enable-powerpc-vsx Please check contrib/powerpc/README file] 501 [for the list of supported OSes.]);; 502 api) 503 AC_DEFINE([PNG_POWERPC_VSX_API_SUPPORTED], [], 504 [Turn on POWERPC VSX optimizations at run-time]);; 505 yes|on) 506 AC_DEFINE([PNG_POWERPC_VSX_OPT], [2], 507 [Enable POWERPC VSX optimizations]) 508 AC_MSG_WARN([--enable-powerpc-vsx: please specify 'check' or 'api', if] 509 [you want the optimizations unconditionally pass '-maltivec -mvsx'] 510 [or '-mcpu=power8'to the compiler.]);; 511 *) 512 AC_MSG_ERROR([--enable-powerpc-vsx=${enable_powerpc_vsx}: invalid value]) 513 esac]) 514 515# Add PowerPC specific files to all builds where the host_cpu is powerpc('powerpc*') or 516# where POWERPC optimizations were explicitly requested (this allows a fallback if a 517# future host CPU does not match 'powerpc*') 518 519AM_CONDITIONAL([PNG_POWERPC_VSX], 520 [test "$enable_powerpc_vsx" != 'no' && 521 case "$host_cpu" in 522 powerpc*|ppc64*) :;; 523 esac]) 524 525 526AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]]) 527 528# Config files, substituting as above 529AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in]) 530AC_CONFIG_FILES([libpng-config:libpng-config.in], 531 [chmod +x libpng-config]) 532 533AC_OUTPUT 534