3 # Copyright (c) 2018 Cosmin Truta
4 # Copyright (c) 2004-2016 Glenn Randers-Pehrson
6 # This code is released under the libpng license.
7 # For conditions of distribution and use, see the disclaimer
10 dnl Process this file with autoconf to produce a configure script.
12 dnl Minor upgrades (compatible ABI): increment the package version
13 dnl (third field in two places below) and set the PNGLIB_RELEASE
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.
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
26 dnl Version number stuff here:
28 AC_INIT([libpng],[1.6.37],[png-mng-implement@lists.sourceforge.net])
29 AC_CONFIG_MACRO_DIR([scripts])
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
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
54 dnl End of version number stuff
56 AC_CONFIG_SRCDIR([pngget.c])
57 AC_CONFIG_HEADERS([config.h])
59 # Checks for programs.
70 dnl libtool/libtoolize; version 2.4.2 is the tested version. This or any
71 dnl compatible later version may be used
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 ${srcdir}/pngusr.dfa 1>&2
84 AC_MSG_FAILURE([failed], 1)
87 # This is a remnant of the old cc -E validation, where it may have been
88 # necessary to use a different preprocessor for .dfn files
92 # -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
93 # checks the compiler with a program that generates a warning), add the
94 # following option to deal with this
96 [additional flags for the C compiler, use this for options that would]
97 [cause configure itself to fail])
99 AS_HELP_STRING([[[--enable-werror[=OPT]]]],
100 [Pass -Werror or the given argument to the compiler if it is supported]),
101 [test "$enable_werror" = "yes" && enable_werror="-Werror"
102 if test "$enable_werror" != "no"; then
104 CFLAGS="$enable_werror $CFLAGS"
105 AC_MSG_CHECKING([if the compiler allows $enable_werror])
108 [int main(int argc, char **argv){]
109 [return argv[argc-1][0];]
112 PNG_COPTS="$PNG_COPTS $enable_werror",
117 # For GCC 5 the default mode for C is -std=gnu11 instead of -std=gnu89
118 # In pngpriv.h we request just the POSIX 1003.1 and C89 APIs by defining _POSIX_SOURCE to 1
119 # This is incompatible with the new default mode, so we test for that and force the
120 # "-std=c89" compiler option:
121 AC_MSG_CHECKING([if we need to force back C standard to C89])
124 [#define _POSIX_SOURCE 1]
128 if test "x$GCC" != "xyes"; then
130 [Forcing back to C89 is required but the flags are only known for GCC])
133 CFLAGS="$CFLAGS -std=c89"
136 # Checks for header files.
139 # Checks for typedefs, structures, and compiler characteristics.
145 # Checks for library functions.
147 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) )
149 # Some later POSIX 1003.1 functions are required for test programs, failure here
150 # is soft (the corresponding test program is not built).
151 AC_CHECK_FUNC([clock_gettime],,[AC_MSG_WARN([not building timepng])])
152 AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"])
154 AC_ARG_WITH(zlib-prefix,
155 AS_HELP_STRING([[[--with-zlib-prefix]]],
156 [prefix that may have been used in installed zlib]),
157 [ZPREFIX=${withval}],
159 AC_CHECK_LIB(z, zlibVersion, ,
160 AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed)))
162 # The following is for pngvalid, to ensure it catches FP errors even on
163 # platforms that don't enable FP exceptions, the function appears in the math
164 # library (typically), it's not an error if it is not found.
165 AC_CHECK_LIB([m], [feenableexcept])
166 AC_CHECK_FUNCS([feenableexcept])
168 AC_MSG_CHECKING([if using Solaris linker])
169 SLD=`$LD --version 2>&1 | grep Solaris`
177 AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
179 AC_MSG_CHECKING([if libraries can be versioned])
180 # Special case for PE/COFF platforms: ld reports
181 # support for version-script, but doesn't actually
182 # DO anything with it.
184 *cygwin* | *mingw32* | *interix* )
185 have_ld_version_script=no
190 if test "$have_solaris_ld" = "yes"; then
191 GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
193 GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
197 have_ld_version_script=yes
200 have_ld_version_script=no
202 AC_MSG_WARN(*** You have not enabled versioned symbols.)
207 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
209 if test "$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)
219 # Substitutions for .in files
220 AC_SUBST(PNGLIB_VERSION)
221 AC_SUBST(PNGLIB_MAJOR)
222 AC_SUBST(PNGLIB_MINOR)
223 AC_SUBST(PNGLIB_RELEASE)
225 # Additional arguments (and substitutions)
226 # Allow the pkg-config directory to be set
227 AC_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'])
233 AC_SUBST([pkgconfigdir])
234 AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])
236 # Make the *-config binary config scripts optional
237 AC_ARG_WITH(binconfigs,
238 AS_HELP_STRING([[[--with-binconfigs]]],
239 [Generate shell libpng-config scripts as well as pkg-config data]
240 [@<:@default=yes@:>@]),
241 [if test "${withval}" = no; then
243 AC_MSG_NOTICE([[libpng-config scripts will not be built]])
245 binconfigs='${binconfigs}'
247 [binconfigs='${binconfigs}'])
248 AC_SUBST([binconfigs])
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
252 AC_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}])
258 AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
260 # Control over what links are made for installed files. Versioned files are
261 # always installed, when the following options are turned on corresponding
262 # unversioned links are also created (normally as symbolic links):
263 AC_ARG_ENABLE([unversioned-links],
264 AS_HELP_STRING([[[--enable-unversioned-links]]],
265 [Installed libpng header files are placed in a versioned subdirectory]
266 [and installed libpng library (including DLL) files are versioned.]
267 [If this option is enabled unversioned links will be created pointing to]
268 [the corresponding installed files. If you use libpng.pc or]
269 [libpng-config for all builds you do not need these links, but if you]
270 [compile programs directly they will typically #include <png.h> and]
271 [link with -lpng; in that case you need the links.]
272 [The links can be installed manually using 'make install-header-links']
273 [and 'make install-library-links' and can be removed using the]
274 [corresponding uninstall- targets. If you do enable this option every]
275 [libpng 'make install' will recreate the links to point to the just]
276 [installed version of libpng. The default is to create the links;]
277 [use --disable-unversioned-links to change this]))
279 # The AM_CONDITIONAL test is written so that the default is enabled;
280 # --disable-unversioned-links must be given to turn the option off.
281 AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"])
283 AC_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]
288 AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC],
289 [test "$enable_unversioned_libpng_pc" != "no"])
291 AC_ARG_ENABLE([unversioned-libpng-config],
292 AS_HELP_STRING([[[--enable-unversioned-libpng-config]]],
293 [Install the configuration file 'libpng-config' as a link to the]
294 [versioned version. This is done by default - use]
295 [--disable-unversioned-libpng-config to change this.]))
296 AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
297 [test "$enable_unversioned_libpng_config" != "no"])
299 # HOST SPECIFIC OPTIONS
300 # =====================
305 AC_ARG_ENABLE([hardware-optimizations],
306 AS_HELP_STRING([[[--enable-hardware-optimizations]]],
307 [Enable hardware optimizations: =no/off, yes/on:]),
308 [case "$enableval" in
310 # disable hardware optimization on all systems:
312 AC_DEFINE([PNG_ARM_NEON_OPT], [0],
313 [Disable ARM_NEON optimizations])
315 AC_DEFINE([PNG_MIPS_MSA_OPT], [0],
316 [Disable MIPS_MSA optimizations])
317 enable_powerpc_vsx=no
318 AC_DEFINE([PNG_POWERPC_VSX_OPT], [0],
319 [Disable POWERPC VSX optimizations])
321 AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
322 [Disable INTEL_SSE optimizations])
325 # allow enabling hardware optimization on any system:
329 AC_DEFINE([PNG_ARM_NEON_OPT], [0],
330 [Enable ARM_NEON optimizations])
334 AC_DEFINE([PNG_MIPS_MSA_OPT], [0],
335 [Enable MIPS_MSA optimizations])
339 AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
340 [Enable Intel SSE optimizations])
343 enable_powerpc_vsx=yes
344 AC_DEFINE([PNG_POWERPC_VSX_OPT], [2],
345 [Enable POWERPC VSX optimizations])
354 # ARM NEON (SIMD) support.
356 AC_ARG_ENABLE([arm-neon],
357 AS_HELP_STRING([[[--enable-arm-neon]]],
358 [Enable ARM NEON optimizations: =no/off, check, api, yes/on:]
359 [no/off: disable the optimizations; check: use internal checking code]
360 [(deprecated and poorly supported); api: disable by default, enable by]
361 [a call to png_set_option; yes/on: turn on unconditionally.]
362 [If not specified: determined by the compiler.]),
363 [case "$enableval" in
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:
371 AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
372 [Check for ARM Neon support at run-time]);;
374 AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
375 [Turn on ARM Neon optimizations at run-time]);;
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.]);;
383 AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value])
386 # Add ARM specific files to all builds where the host_cpu is arm ('arm*') or
387 # where ARM optimizations were explicitly requested (this allows a fallback if a
388 # future host CPU does not match 'arm*')
390 AM_CONDITIONAL([PNG_ARM_NEON],
391 [test "$enable_arm_neon" != 'no' &&
394 *) test "$enable_arm_neon" != '';;
400 # MIPS MSA (SIMD) support.
402 AC_ARG_ENABLE([mips-msa],
403 AS_HELP_STRING([[[--enable-mips-msa]]],
404 [Enable MIPS MSA optimizations: =no/off, check, api, yes/on:]
405 [no/off: disable the optimizations; check: use internal checking code]
406 [(deprecated and poorly supported); api: disable by default, enable by]
407 [a call to png_set_option; yes/on: turn on unconditionally.]
408 [If not specified: determined by the compiler.]),
409 [case "$enableval" in
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:
417 AC_DEFINE([PNG_MIPS_MSA_CHECK_SUPPORTED], [],
418 [Check for MIPS MSA support at run-time]);;
420 AC_DEFINE([PNG_MIPS_MSA_API_SUPPORTED], [],
421 [Turn on MIPS MSA optimizations at run-time]);;
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.]);;
429 AC_MSG_ERROR([--enable-mips-msa=${enable_mips_msa}: invalid value])
432 # Add MIPS specific files to all builds where the host_cpu is mips ('mips*') or
433 # where MIPS optimizations were explicitly requested (this allows a fallback if a
434 # future host CPU does not match 'mips*')
436 AM_CONDITIONAL([PNG_MIPS_MSA],
437 [test "$enable_mips_msa" != 'no' &&
439 mipsel*|mips64el*) :;;
445 # INTEL SSE (SIMD) support.
447 AC_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 "$enableval" in
455 # disable the default enabling:
456 AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
457 [Disable Intel SSE optimizations])
458 # Prevent inclusion of the assembler files below:
459 enable_intel_sse=no;;
461 AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
462 [Enable Intel SSE optimizations]);;
464 AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value])
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*')
470 AM_CONDITIONAL([PNG_INTEL_SSE],
471 [test "$enable_intel_sse" != 'no' &&
474 *) test "$enable_intel_sse" != '';;
480 # PowerPC VSX (SIMD) support.
482 AC_ARG_ENABLE([powerpc-vsx],
483 AS_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 "$enableval" in
491 # disable the default enabling on __ppc64__ systems:
492 AC_DEFINE([PNG_POWERPC_VSX_OPT], [0],
493 [Disable POWERPC VSX optimizations])
494 # Prevent inclusion of the platform specific files below:
495 enable_powerpc_vsx=no;;
497 AC_DEFINE([PNG_POWERPC_VSX_CHECK_SUPPORTED], [],
498 [Check for POWERPC VSX support at run-time])
499 AC_MSG_WARN([--enable-powerpc-vsx Please check contrib/powerpc/README file]
500 [for the list of supported OSes.]);;
502 AC_DEFINE([PNG_POWERPC_VSX_API_SUPPORTED], [],
503 [Turn on POWERPC VSX optimizations at run-time]);;
505 AC_DEFINE([PNG_POWERPC_VSX_OPT], [2],
506 [Enable POWERPC VSX optimizations])
507 AC_MSG_WARN([--enable-powerpc-vsx: please specify 'check' or 'api', if]
508 [you want the optimizations unconditionally pass '-maltivec -mvsx']
509 [or '-mcpu=power8'to the compiler.]);;
511 AC_MSG_ERROR([--enable-powerpc-vsx=${enable_powerpc_vsx}: invalid value])
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*')
518 AM_CONDITIONAL([PNG_POWERPC_VSX],
519 [test "$enable_powerpc_vsx" != 'no' &&
525 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
527 # Config files, substituting as above
528 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
529 AC_CONFIG_FILES([libpng-config:libpng-config.in],
530 [chmod +x libpng-config])