1# configure.ac 2 3# Copyright (c) 2018 Cosmin Truta 4# Copyright (c) 2004-2016 Glenn Randers-Pehrson 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],[1.6.37],[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=1.6.37 50PNGLIB_MAJOR=1 51PNGLIB_MINOR=6 52PNGLIB_RELEASE=37 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([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) ) 148 149# Some later POSIX 1003.1 functions are required for test programs, failure here 150# is soft (the corresponding test program is not built). 151AC_CHECK_FUNC([clock_gettime],,[AC_MSG_WARN([not building timepng])]) 152AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"]) 153 154AC_ARG_WITH(zlib-prefix, 155 AS_HELP_STRING([[[--with-zlib-prefix]]], 156 [prefix that may have been used in installed zlib]), 157 [ZPREFIX=${withval}], 158 [ZPREFIX='z_']) 159AC_CHECK_LIB(z, zlibVersion, , 160 AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed))) 161 162# The following is for pngvalid, to ensure it catches FP errors even on 163# platforms that don't enable FP exceptions, the function appears in the math 164# library (typically), it's not an error if it is not found. 165AC_CHECK_LIB([m], [feenableexcept]) 166AC_CHECK_FUNCS([feenableexcept]) 167 168AC_MSG_CHECKING([if using Solaris linker]) 169SLD=`$LD --version 2>&1 | grep Solaris` 170if test "$SLD"; then 171 have_solaris_ld=yes 172 AC_MSG_RESULT(yes) 173else 174 have_solaris_ld=no 175 AC_MSG_RESULT(no) 176fi 177AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes") 178 179AC_MSG_CHECKING([if libraries can be versioned]) 180# Special case for PE/COFF platforms: ld reports 181# support for version-script, but doesn't actually 182# DO anything with it. 183case $host in 184*cygwin* | *mingw32* | *interix* ) 185 have_ld_version_script=no 186 AC_MSG_RESULT(no) 187;; 188* ) 189 190if test "$have_solaris_ld" = "yes"; then 191 GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'` 192else 193 GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script` 194fi 195 196if test "$GLD"; then 197 have_ld_version_script=yes 198 AC_MSG_RESULT(yes) 199else 200 have_ld_version_script=no 201 AC_MSG_RESULT(no) 202 AC_MSG_WARN(*** You have not enabled versioned symbols.) 203fi 204;; 205esac 206 207AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") 208 209if test "$have_ld_version_script" = "yes"; then 210 AC_MSG_CHECKING([for symbol prefix]) 211 SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \ 212 | ${CPP-${CC-gcc} -E} - 2>&1 \ 213 | ${EGREP-grep} "^PREFIX=" \ 214 | ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"` 215 AC_SUBST(SYMBOL_PREFIX) 216 AC_MSG_RESULT($SYMBOL_PREFIX) 217fi 218 219# Substitutions for .in files 220AC_SUBST(PNGLIB_VERSION) 221AC_SUBST(PNGLIB_MAJOR) 222AC_SUBST(PNGLIB_MINOR) 223AC_SUBST(PNGLIB_RELEASE) 224 225# Additional arguments (and substitutions) 226# Allow the pkg-config directory to be set 227AC_ARG_WITH(pkgconfigdir, 228 AS_HELP_STRING([[[--with-pkgconfigdir]]], 229 [Use the specified pkgconfig dir (default is libdir/pkgconfig)]), 230 [pkgconfigdir=${withval}], 231 [pkgconfigdir='${libdir}/pkgconfig']) 232 233AC_SUBST([pkgconfigdir]) 234AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]]) 235 236# Make the *-config binary config scripts optional 237AC_ARG_WITH(binconfigs, 238 AS_HELP_STRING([[[--with-binconfigs]]], 239 [Generate shell libpng-config scripts as well as pkg-config data] 240 [@<:@default=yes@:>@]), 241 [if test "${withval}" = no; then 242 binconfigs= 243 AC_MSG_NOTICE([[libpng-config scripts will not be built]]) 244 else 245 binconfigs='${binconfigs}' 246 fi], 247 [binconfigs='${binconfigs}']) 248AC_SUBST([binconfigs]) 249 250# Support for prefixes to the API function names; this will generate defines 251# at the start of the build to rename exported library functions 252AC_ARG_WITH(libpng-prefix, 253 AS_HELP_STRING([[[--with-libpng-prefix]]], 254 [prefix libpng exported function (API) names with the given value]), 255 [if test "${withval:-no}" != "no"; then 256 AC_SUBST([PNG_PREFIX], [${withval}]) 257 fi]) 258AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"]) 259 260# Control over what links are made for installed files. Versioned files are 261# always installed, when the following options are turned on corresponding 262# unversioned links are also created (normally as symbolic links): 263AC_ARG_ENABLE([unversioned-links], 264 AS_HELP_STRING([[[--enable-unversioned-links]]], 265 [Installed libpng header files are placed in a versioned subdirectory] 266 [and installed libpng library (including DLL) files are versioned.] 267 [If this option is enabled unversioned links will be created pointing to] 268 [the corresponding installed files. If you use libpng.pc or] 269 [libpng-config for all builds you do not need these links, but if you] 270 [compile programs directly they will typically #include <png.h> and] 271 [link with -lpng; in that case you need the links.] 272 [The links can be installed manually using 'make install-header-links'] 273 [and 'make install-library-links' and can be removed using the] 274 [corresponding uninstall- targets. If you do enable this option every] 275 [libpng 'make install' will recreate the links to point to the just] 276 [installed version of libpng. The default is to create the links;] 277 [use --disable-unversioned-links to change this])) 278 279# The AM_CONDITIONAL test is written so that the default is enabled; 280# --disable-unversioned-links must be given to turn the option off. 281AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"]) 282 283AC_ARG_ENABLE([unversioned-libpng-pc], 284 AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]], 285 [Install the configuration file 'libpng.pc' as a link to the versioned] 286 [version. This is done by default - use --disable-unversioned-libpng-pc] 287 [to change this.])) 288AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC], 289 [test "$enable_unversioned_libpng_pc" != "no"]) 290 291AC_ARG_ENABLE([unversioned-libpng-config], 292 AS_HELP_STRING([[[--enable-unversioned-libpng-config]]], 293 [Install the configuration file 'libpng-config' as a link to the] 294 [versioned version. This is done by default - use] 295 [--disable-unversioned-libpng-config to change this.])) 296AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG], 297 [test "$enable_unversioned_libpng_config" != "no"]) 298 299# HOST SPECIFIC OPTIONS 300# ===================== 301# 302# DEFAULT 303# ======= 304# 305AC_ARG_ENABLE([hardware-optimizations], 306 AS_HELP_STRING([[[--enable-hardware-optimizations]]], 307 [Enable hardware optimizations: =no/off, yes/on:]), 308 [case "$enableval" in 309 no|off) 310 # disable hardware optimization on all systems: 311 enable_arm_neon=no 312 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 313 [Disable ARM_NEON optimizations]) 314 enable_mips_msa=no 315 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 316 [Disable MIPS_MSA optimizations]) 317 enable_powerpc_vsx=no 318 AC_DEFINE([PNG_POWERPC_VSX_OPT], [0], 319 [Disable POWERPC VSX optimizations]) 320 enable_intel_sse=no 321 AC_DEFINE([PNG_INTEL_SSE_OPT], [0], 322 [Disable INTEL_SSE optimizations]) 323 ;; 324 *) 325 # allow enabling hardware optimization on any system: 326 case "$host_cpu" in 327 arm*|aarch64*) 328 enable_arm_neon=yes 329 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 330 [Enable ARM_NEON optimizations]) 331 ;; 332 mipsel*|mips64el*) 333 enable_mips_msa=yes 334 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 335 [Enable MIPS_MSA optimizations]) 336 ;; 337 i?86|x86_64) 338 enable_intel_sse=yes 339 AC_DEFINE([PNG_INTEL_SSE_OPT], [1], 340 [Enable Intel SSE optimizations]) 341 ;; 342 powerpc*|ppc64*) 343 enable_powerpc_vsx=yes 344 AC_DEFINE([PNG_POWERPC_VSX_OPT], [2], 345 [Enable POWERPC VSX optimizations]) 346 ;; 347 esac 348 ;; 349 esac]) 350 351# ARM 352# === 353# 354# ARM NEON (SIMD) support. 355 356AC_ARG_ENABLE([arm-neon], 357 AS_HELP_STRING([[[--enable-arm-neon]]], 358 [Enable ARM NEON optimizations: =no/off, check, api, yes/on:] 359 [no/off: disable the optimizations; check: use internal checking code] 360 [(deprecated and poorly supported); api: disable by default, enable by] 361 [a call to png_set_option; yes/on: turn on unconditionally.] 362 [If not specified: determined by the compiler.]), 363 [case "$enableval" in 364 no|off) 365 # disable the default enabling on __ARM_NEON__ systems: 366 AC_DEFINE([PNG_ARM_NEON_OPT], [0], 367 [Disable ARM Neon optimizations]) 368 # Prevent inclusion of the assembler files below: 369 enable_arm_neon=no;; 370 check) 371 AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [], 372 [Check for ARM Neon support at run-time]);; 373 api) 374 AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [], 375 [Turn on ARM Neon optimizations at run-time]);; 376 yes|on) 377 AC_DEFINE([PNG_ARM_NEON_OPT], [2], 378 [Enable ARM Neon optimizations]) 379 AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if] 380 [you want the optimizations unconditionally pass -mfpu=neon] 381 [to the compiler.]);; 382 *) 383 AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value]) 384 esac]) 385 386# Add ARM specific files to all builds where the host_cpu is arm ('arm*') or 387# where ARM optimizations were explicitly requested (this allows a fallback if a 388# future host CPU does not match 'arm*') 389 390AM_CONDITIONAL([PNG_ARM_NEON], 391 [test "$enable_arm_neon" != 'no' && 392 case "$host_cpu" in 393 arm*|aarch64*) :;; 394 *) test "$enable_arm_neon" != '';; 395 esac]) 396 397# MIPS 398# === 399# 400# MIPS MSA (SIMD) support. 401 402AC_ARG_ENABLE([mips-msa], 403 AS_HELP_STRING([[[--enable-mips-msa]]], 404 [Enable MIPS MSA optimizations: =no/off, check, api, yes/on:] 405 [no/off: disable the optimizations; check: use internal checking code] 406 [(deprecated and poorly supported); api: disable by default, enable by] 407 [a call to png_set_option; yes/on: turn on unconditionally.] 408 [If not specified: determined by the compiler.]), 409 [case "$enableval" in 410 no|off) 411 # disable the default enabling on __mips_msa systems: 412 AC_DEFINE([PNG_MIPS_MSA_OPT], [0], 413 [Disable MIPS MSA optimizations]) 414 # Prevent inclusion of the assembler files below: 415 enable_mips_msa=no;; 416 check) 417 AC_DEFINE([PNG_MIPS_MSA_CHECK_SUPPORTED], [], 418 [Check for MIPS MSA support at run-time]);; 419 api) 420 AC_DEFINE([PNG_MIPS_MSA_API_SUPPORTED], [], 421 [Turn on MIPS MSA optimizations at run-time]);; 422 yes|on) 423 AC_DEFINE([PNG_MIPS_MSA_OPT], [2], 424 [Enable MIPS MSA optimizations]) 425 AC_MSG_WARN([--enable-mips-msa: please specify 'check' or 'api', if] 426 [you want the optimizations unconditionally pass '-mmsa -mfp64'] 427 [to the compiler.]);; 428 *) 429 AC_MSG_ERROR([--enable-mips-msa=${enable_mips_msa}: invalid value]) 430 esac]) 431 432# Add MIPS specific files to all builds where the host_cpu is mips ('mips*') or 433# where MIPS optimizations were explicitly requested (this allows a fallback if a 434# future host CPU does not match 'mips*') 435 436AM_CONDITIONAL([PNG_MIPS_MSA], 437 [test "$enable_mips_msa" != 'no' && 438 case "$host_cpu" in 439 mipsel*|mips64el*) :;; 440 esac]) 441 442# INTEL 443# ===== 444# 445# INTEL SSE (SIMD) support. 446 447AC_ARG_ENABLE([intel-sse], 448 AS_HELP_STRING([[[--enable-intel-sse]]], 449 [Enable Intel SSE optimizations: =no/off, yes/on:] 450 [no/off: disable the optimizations;] 451 [yes/on: enable the optimizations.] 452 [If not specified: determined by the compiler.]), 453 [case "$enableval" in 454 no|off) 455 # disable the default enabling: 456 AC_DEFINE([PNG_INTEL_SSE_OPT], [0], 457 [Disable Intel SSE optimizations]) 458 # Prevent inclusion of the assembler files below: 459 enable_intel_sse=no;; 460 yes|on) 461 AC_DEFINE([PNG_INTEL_SSE_OPT], [1], 462 [Enable Intel SSE optimizations]);; 463 *) 464 AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value]) 465 esac]) 466 467# Add Intel specific files to all builds where the host_cpu is Intel ('x86*') 468# or where Intel optimizations were explicitly requested (this allows a 469# fallback if a future host CPU does not match 'x86*') 470AM_CONDITIONAL([PNG_INTEL_SSE], 471 [test "$enable_intel_sse" != 'no' && 472 case "$host_cpu" in 473 i?86|x86_64) :;; 474 *) test "$enable_intel_sse" != '';; 475 esac]) 476 477# PowerPC 478# === 479# 480# PowerPC VSX (SIMD) support. 481 482AC_ARG_ENABLE([powerpc-vsx], 483AS_HELP_STRING([[[--enable-powerpc-vsx]]], 484 [Enable POWERPC VSX optimizations: =no/off, check, api, yes/on:] 485 [no/off: disable the optimizations; check: use internal checking code] 486 [api: disable by default, enable by a call to png_set_option] 487 [yes/on: turn on unconditionally.] 488 [If not specified: determined by the compiler.]), 489 [case "$enableval" in 490 no|off) 491 # disable the default enabling on __ppc64__ systems: 492 AC_DEFINE([PNG_POWERPC_VSX_OPT], [0], 493 [Disable POWERPC VSX optimizations]) 494 # Prevent inclusion of the platform specific files below: 495 enable_powerpc_vsx=no;; 496 check) 497 AC_DEFINE([PNG_POWERPC_VSX_CHECK_SUPPORTED], [], 498 [Check for POWERPC VSX support at run-time]) 499 AC_MSG_WARN([--enable-powerpc-vsx Please check contrib/powerpc/README file] 500 [for the list of supported OSes.]);; 501 api) 502 AC_DEFINE([PNG_POWERPC_VSX_API_SUPPORTED], [], 503 [Turn on POWERPC VSX optimizations at run-time]);; 504 yes|on) 505 AC_DEFINE([PNG_POWERPC_VSX_OPT], [2], 506 [Enable POWERPC VSX optimizations]) 507 AC_MSG_WARN([--enable-powerpc-vsx: please specify 'check' or 'api', if] 508 [you want the optimizations unconditionally pass '-maltivec -mvsx'] 509 [or '-mcpu=power8'to the compiler.]);; 510 *) 511 AC_MSG_ERROR([--enable-powerpc-vsx=${enable_powerpc_vsx}: invalid value]) 512 esac]) 513 514# Add PowerPC specific files to all builds where the host_cpu is powerpc('powerpc*') or 515# where POWERPC optimizations were explicitly requested (this allows a fallback if a 516# future host CPU does not match 'powerpc*') 517 518AM_CONDITIONAL([PNG_POWERPC_VSX], 519 [test "$enable_powerpc_vsx" != 'no' && 520 case "$host_cpu" in 521 powerpc*|ppc64*) :;; 522 esac]) 523 524 525AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]]) 526 527# Config files, substituting as above 528AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in]) 529AC_CONFIG_FILES([libpng-config:libpng-config.in], 530 [chmod +x libpng-config]) 531 532AC_OUTPUT 533