configure.ac@ 107044

Last change on this file since 107044 was 105469, checked in by vboxsync, 4 months ago
libpng-1.6.43: Applied and adjusted our libpng changes to 1.6.43. bugref:8515
Property svn:eol-style set to `native`
File size: 23.9 KB

Line
1	# configure.ac
2
3	# Copyright (c) 2018-2024 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
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],[1.6.43],[png-mng-implement@lists.sourceforge.net])
29	AC_CONFIG_MACRO_DIR([scripts/autoconf])
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=1.6.43
50	PNGLIB_MAJOR=1
51	PNGLIB_MINOR=6
52	PNGLIB_RELEASE=43
53
54	dnl End of version number stuff
55
56	AC_CONFIG_SRCDIR([pngget.c])
57	AC_CONFIG_HEADERS([config.h])
58
59	# Check for basic 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	dnl Declare the AWK variable.
76	AC_ARG_VAR(AWK, [AWK language processor])
77
78	# Some awk implementations crash when confronted with pnglibconf.dfa.
79	# Run a test now, to make sure this doesn't happen.
80	AC_MSG_CHECKING([if awk ($AWK) works])
81	if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\
82	${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
83	${srcdir}/pngusr.dfa 1>&2
84	then
85	AC_MSG_RESULT([yes])
86	else
87	AC_MSG_FAILURE([no], 1)
88	fi
89
90	# This is a remnant of the old cc -E validation, where it may have been
91	# necessary to use a different preprocessor for .dfn files
92	DFNCPP="$CPP"
93	AC_SUBST(DFNCPP)
94
95	AC_ARG_ENABLE([tests],
96	AS_HELP_STRING([--disable-tests],
97	[do not build the test programs (default is to build)]),
98	[enable_tests="$enableval"],
99	[enable_tests=yes])
100
101	AM_CONDITIONAL([ENABLE_TESTS],
102	[test "$enable_tests" != "no"])
103
104	AC_ARG_ENABLE([tools],
105	AS_HELP_STRING([--disable-tools],
106	[do not build the auxiliary tools (default is to build)]),
107	[enable_tools="$enableval"],
108	[enable_tools=yes])
109
110	AM_CONDITIONAL([ENABLE_TOOLS],
111	[test "$enable_tools" != "no"])
112
113	# -Werror cannot be passed to GCC in CFLAGS because configure will fail
114	# (it checks the compiler with a program that generates a warning).
115	# Add the following option to deal with this:
116	AC_ARG_VAR(PNG_COPTS,
117	[additional flags for the C compiler, to be used for options that would]
118	[cause configure itself to fail])
119	AC_ARG_ENABLE(werror,
120	AS_HELP_STRING([[[--enable-werror[=OPT]]]],
121	[Pass -Werror or the given argument to the compiler if it is supported]),
122	[test "$enable_werror" = "yes" && enable_werror="-Werror"
123	if test "$enable_werror" != "no"; then
124	sav_CFLAGS="$CFLAGS"
125	CFLAGS="$enable_werror $CFLAGS"
126	AC_MSG_CHECKING([if the compiler allows $enable_werror])
127	AC_COMPILE_IFELSE(
128	[AC_LANG_SOURCE([
129	[int main(int argc, char **argv){]
130	[return argv[argc-1][0];]
131	[}]])],
132	AC_MSG_RESULT(yes)
133	PNG_COPTS="$PNG_COPTS $enable_werror",
134	AC_MSG_RESULT(no))
135	CFLAGS="$sav_CFLAGS"
136	fi],)
137
138	# For GCC 5 the default mode for C is -std=gnu11 instead of -std=gnu89.
139	# In pngpriv.h we request just the POSIX 1003.1 and C89 APIs by defining
140	# _POSIX_SOURCE to 1. This is incompatible with the new default mode, so
141	# we test for that and force the "-std=c89" compiler option:
142	AC_MSG_CHECKING([if we need to force back C standard to C89])
143	AC_COMPILE_IFELSE(
144	[AC_LANG_PROGRAM([
145	[#define _POSIX_SOURCE 1]
146	[#include <stdio.h>]
147	])],
148	AC_MSG_RESULT(no),[
149	if test "x$GCC" != "xyes"; then
150	AC_MSG_ERROR(
151	[Forcing back to C89 is required but the flags are only known for GCC])
152	fi
153	AC_MSG_RESULT(yes)
154	CFLAGS="$CFLAGS -std=c89"
155	])
156
157	# Checks for structures and compiler characteristics.
158	AC_STRUCT_TM
159	AC_C_RESTRICT
160
161	# Checks for library functions.
162	AC_CHECK_FUNCS([pow], ,
163	[AC_CHECK_LIB([m], [pow], , [AC_MSG_ERROR([cannot find pow])])])
164
165	# Some later POSIX 1003.1 functions are required for test programs, failure
166	# here is soft (the corresponding test program is not built).
167	AC_CHECK_FUNC([clock_gettime], , [AC_MSG_WARN([not building timepng])])
168	AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"])
169
170	AC_ARG_WITH(zlib-prefix,
171	AS_HELP_STRING([[[--with-zlib-prefix]]],
172	[prefix that may have been used in installed zlib]),
173	[ZPREFIX=${withval}],
174	[ZPREFIX='z_'])
175	AC_CHECK_LIB([z], [zlibVersion], ,
176	[AC_CHECK_LIB([z], [${ZPREFIX}zlibVersion], ,
177	[AC_MSG_ERROR([zlib not installed])])])
178
179	# The following is for pngvalid, to ensure it catches FP errors even on
180	# platforms that don't enable FP exceptions, the function appears in the math
181	# library (typically), it's not an error if it is not found.
182	AC_CHECK_LIB([m], [feenableexcept])
183	AC_CHECK_FUNCS([feenableexcept])
184
185	AC_MSG_CHECKING([if using Solaris linker])
186	SLD=`$LD --version 2>&1 \| grep Solaris`
187	if test "$SLD"; then
188	have_solaris_ld=yes
189	AC_MSG_RESULT(yes)
190	else
191	have_solaris_ld=no
192	AC_MSG_RESULT(no)
193	fi
194	AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
195
196	AC_MSG_CHECKING([if libraries can be versioned])
197	# Special case for PE/COFF platforms: ld reports
198	# support for version-script, but doesn't actually
199	# DO anything with it.
200	case $host in
201	cygwin \| mingw32 \| interix )
202	have_ld_version_script=no
203	AC_MSG_RESULT(no)
204	;;
205	* )
206
207	if test "$have_solaris_ld" = "yes"; then
208	GLD=`$LD --help < /dev/null 2>&1 \| grep 'M mapfile'`
209	else
210	GLD=`$LD --help < /dev/null 2>/dev/null \| grep version-script`
211	fi
212
213	if test "$GLD"; then
214	have_ld_version_script=yes
215	AC_MSG_RESULT(yes)
216	else
217	have_ld_version_script=no
218	AC_MSG_RESULT(no)
219	AC_MSG_WARN(*** You have not enabled versioned symbols.)
220	fi
221	;;
222	esac
223
224	AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
225
226	if test "$have_ld_version_script" = "yes"; then
227	AC_MSG_CHECKING([for symbol prefix])
228	SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
229	\| ${CPP:-${CC:-gcc} -E} - 2>&1 \
230	\| ${EGREP:-grep} "^PREFIX=" \
231	\| ${SED:-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
232	AC_SUBST(SYMBOL_PREFIX)
233	AC_MSG_RESULT($SYMBOL_PREFIX)
234	fi
235
236	# Substitutions for .in files
237	AC_SUBST(PNGLIB_VERSION)
238	AC_SUBST(PNGLIB_MAJOR)
239	AC_SUBST(PNGLIB_MINOR)
240	AC_SUBST(PNGLIB_RELEASE)
241
242	# Additional arguments (and substitutions)
243	# Allow the pkg-config directory to be set
244	AC_ARG_WITH(pkgconfigdir,
245	AS_HELP_STRING([[[--with-pkgconfigdir]]],
246	[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
247	[pkgconfigdir=${withval}],
248	[pkgconfigdir='${libdir}/pkgconfig'])
249
250	AC_SUBST([pkgconfigdir])
251	AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])
252
253	# Make the *-config binary config scripts optional
254	AC_ARG_WITH(binconfigs,
255	AS_HELP_STRING([[[--with-binconfigs]]],
256	[Generate shell libpng-config scripts as well as pkg-config data]
257	[@<:@default=yes@:>@]),
258	[if test "${withval}" = no; then
259	binconfigs=
260	AC_MSG_NOTICE([[libpng-config scripts will not be built]])
261	else
262	binconfigs='${binconfigs}'
263	fi],
264	[binconfigs='${binconfigs}'])
265	AC_SUBST([binconfigs])
266
267	# Support for prefixes to the API function names; this will generate defines
268	# at the start of the build to rename exported library functions
269	AC_ARG_WITH(libpng-prefix,
270	AS_HELP_STRING([[[--with-libpng-prefix]]],
271	[prefix libpng exported function (API) names with the given value]),
272	[if test "${withval:-no}" != "no"; then
273	AC_SUBST([PNG_PREFIX], [${withval}])
274	fi])
275	AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
276
277	# Control over what links are made for installed files. Versioned files are
278	# always installed, when the following options are turned on corresponding
279	# unversioned links are also created (normally as symbolic links):
280	AC_ARG_ENABLE([unversioned-links],
281	AS_HELP_STRING([[[--enable-unversioned-links]]],
282	[Installed libpng header files are placed in a versioned subdirectory]
283	[and installed libpng library (including DLL) files are versioned.]
284	[If this option is enabled unversioned links will be created pointing to]
285	[the corresponding installed files. If you use libpng.pc or]
286	[libpng-config for all builds you do not need these links, but if you]
287	[compile programs directly they will typically #include <png.h> and]
288	[link with -lpng; in that case you need the links.]
289	[The links can be installed manually using 'make install-header-links']
290	[and 'make install-library-links' and can be removed using the]
291	[corresponding uninstall- targets. If you do enable this option every]
292	[libpng 'make install' will recreate the links to point to the just]
293	[installed version of libpng. The default is to create the links;]
294	[use --disable-unversioned-links to change this]))
295
296	# The AM_CONDITIONAL test is written so that the default is enabled;
297	# --disable-unversioned-links must be given to turn the option off.
298	AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"])
299
300	AC_ARG_ENABLE([unversioned-libpng-pc],
301	AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]],
302	[Install the configuration file 'libpng.pc' as a link to the versioned]
303	[version. This is done by default - use --disable-unversioned-libpng-pc]
304	[to change this.]))
305	AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC],
306	[test "$enable_unversioned_libpng_pc" != "no"])
307
308	AC_ARG_ENABLE([unversioned-libpng-config],
309	AS_HELP_STRING([[[--enable-unversioned-libpng-config]]],
310	[Install the configuration file 'libpng-config' as a link to the]
311	[versioned version. This is done by default - use]
312	[--disable-unversioned-libpng-config to change this.]))
313	AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
314	[test "$enable_unversioned_libpng_config" != "no"])
315
316	# HOST-SPECIFIC OPTIONS
317	# =====================
318	#
319	# DEFAULT
320	# =======
321	#
322	AC_ARG_ENABLE([hardware-optimizations],
323	AS_HELP_STRING([[[--enable-hardware-optimizations]]],
324	[Enable hardware optimizations: =no/off, yes/on.]),
325	[case "$enableval" in
326	no\|off)
327	# disable hardware optimization on all systems:
328	enable_arm_neon=no
329	AC_DEFINE([PNG_ARM_NEON_OPT], [0],
330	[Disable ARM_NEON optimizations])
331	enable_mips_msa=no
332	AC_DEFINE([PNG_MIPS_MSA_OPT], [0],
333	[Disable MIPS_MSA optimizations])
334	enable_mips_mmi=no
335	AC_DEFINE([PNG_MIPS_MMI_OPT], [0],
336	[Disable MIPS_MMI optimizations])
337	enable_powerpc_vsx=no
338	AC_DEFINE([PNG_POWERPC_VSX_OPT], [0],
339	[Disable POWERPC VSX optimizations])
340	enable_intel_sse=no
341	AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
342	[Disable INTEL_SSE optimizations])
343	enable_loongarch_lsx=no
344	AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [0],
345	[Disable LOONGARCH_LSX optimizations])
346	;;
347	*)
348	# allow enabling hardware optimization on any system:
349	case "$host_cpu" in
350	arm\|aarch64)
351	enable_arm_neon=yes
352	AC_DEFINE([PNG_ARM_NEON_OPT], [2],
353	[Enable ARM_NEON optimizations])
354	;;
355	mipsel\|mips64el)
356	enable_mips_mmi=yes
357	enable_mips_msa=yes
358	AC_DEFINE([PNG_MIPS_MMI_OPT], [1],
359	[Enable MIPS_MMI optimizations])
360	AC_DEFINE([PNG_MIPS_MSA_OPT], [2],
361	[Enable MIPS_MSA optimizations])
362	;;
363	i?86\|x86_64)
364	enable_intel_sse=yes
365	AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
366	[Enable Intel SSE optimizations])
367	;;
368	powerpc\|ppc64)
369	enable_powerpc_vsx=yes
370	AC_DEFINE([PNG_POWERPC_VSX_OPT], [2],
371	[Enable POWERPC VSX optimizations])
372	;;
373	loongarch*)
374	enable_loongarch_lsx=yes
375	AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [1],
376	[Enable LOONGARCH_LSX optimizations])
377	;;
378	esac
379	;;
380	esac])
381
382	# ARM NEON
383	# ========
384
385	AC_ARG_ENABLE([arm-neon],
386	AS_HELP_STRING([[[--enable-arm-neon]]],
387	[Enable ARM NEON optimizations: =no/off, check, api, yes/on.]
388	[no/off: disable the optimizations;]
389	[check: use internal checking code (deprecated and poorly supported);]
390	[api: disable by default, enable by a call to png_set_option;]
391	[yes/on: turn on unconditionally.]
392	[If not specified: determined by the compiler.]),
393	[case "$enableval" in
394	no\|off)
395	# disable the default enabling on __ARM_NEON__ systems:
396	AC_DEFINE([PNG_ARM_NEON_OPT], [0],
397	[Disable ARM Neon optimizations])
398	# Prevent inclusion of the assembler files below:
399	enable_arm_neon=no ;;
400	check)
401	AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
402	[Check for ARM Neon support at run-time]);;
403	api)
404	AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
405	[Turn on ARM Neon optimizations at run-time]);;
406	yes\|on)
407	AC_DEFINE([PNG_ARM_NEON_OPT], [2],
408	[Enable ARM Neon optimizations])
409	AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api';]
410	[if you want the optimizations unconditionally,]
411	[pass '-mfpu=neon' to the compiler.]);;
412	*)
413	AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}:]
414	[invalid argument])
415	esac])
416
417	# Add ARM-specific files to all builds where $host_cpu is arm ('arm*') or
418	# where ARM optimizations were explicitly requested. (This allows a fallback
419	# if a future host CPU does not match 'arm*'.)
420
421	AM_CONDITIONAL([PNG_ARM_NEON],
422	[test "$enable_arm_neon" != 'no' &&
423	case "$host_cpu" in
424	arm\|aarch64) : ;;
425	*) test "$enable_arm_neon" != '' ;;
426	esac])
427
428	# MIPS MSA
429	# ========
430
431	AC_ARG_ENABLE([mips-msa],
432	AS_HELP_STRING([[[--enable-mips-msa]]],
433	[Enable MIPS MSA optimizations: =no/off, check, api, yes/on.]
434	[no/off: disable the optimizations;]
435	[check: use internal checking code (deprecated and poorly supported);]
436	[api: disable by default, enable by a call to png_set_option;]
437	[yes/on: turn on unconditionally.]
438	[If not specified: determined by the compiler.]),
439	[case "$enableval" in
440	no\|off)
441	# disable the default enabling on __mips_msa systems:
442	AC_DEFINE([PNG_MIPS_MSA_OPT], [0],
443	[Disable MIPS MSA optimizations])
444	# Prevent inclusion of the assembler files below:
445	enable_mips_msa=no ;;
446	check)
447	AC_DEFINE([PNG_MIPS_MSA_CHECK_SUPPORTED], [],
448	[Check for MIPS MSA support at run-time]);;
449	api)
450	AC_DEFINE([PNG_MIPS_MSA_API_SUPPORTED], [],
451	[Turn on MIPS MSA optimizations at run-time]);;
452	yes\|on)
453	AC_DEFINE([PNG_MIPS_MSA_OPT], [2],
454	[Enable MIPS MSA optimizations])
455	AC_MSG_WARN([--enable-mips-msa: please specify 'check' or 'api';]
456	[if you want the optimizations unconditionally,]
457	[pass '-mmsa -mfp64' to the compiler.]);;
458	*)
459	AC_MSG_ERROR([--enable-mips-msa=${enable_mips_msa}:]
460	[invalid argument])
461	esac])
462
463	# Add MIPS-specific files to all builds where $host_cpu is mips ('mips*') or
464	# where MIPS optimizations were explicitly requested. (This allows a fallback
465	# if a future host CPU does not match 'mips*'.)
466
467	AM_CONDITIONAL([PNG_MIPS_MSA],
468	[test "$enable_mips_msa" != 'no' &&
469	case "$host_cpu" in
470	mipsel\|mips64el) : ;;
471	esac])
472
473	# MIPS MMI
474	# ========
475
476	AC_ARG_ENABLE([mips-mmi],
477	AS_HELP_STRING([[[--enable-mips-mmi]]],
478	[Enable MIPS MMI optimizations: =no/off, check, api, yes/on.]
479	[no/off: disable the optimizations;]
480	[check: use internal checking code (deprecated and poorly supported);]
481	[api: disable by default, enable by a call to png_set_option;]
482	[yes/on: turn on unconditionally.]
483	[If not specified: determined by the compiler.]),
484	[case "$enableval" in
485	no\|off)
486	# disable the default enabling on __mips_mmi systems:
487	AC_DEFINE([PNG_MIPS_MMI_OPT], [0],
488	[Disable MIPS MMI optimizations])
489	# Prevent inclusion of the assembler files below:
490	enable_mips_mmi=no;;
491	check)
492	AC_DEFINE([PNG_MIPS_MMI_CHECK_SUPPORTED], [],
493	[Check for MIPS MMI support at run-time]);;
494	api)
495	AC_DEFINE([PNG_MIPS_MMI_API_SUPPORTED], [],
496	[Turn on MIPS MMI optimizations at run-time]);;
497	yes\|on)
498	AC_DEFINE([PNG_MIPS_MMI_OPT], [1],
499	[Enable MIPS MMI optimizations])
500	AC_MSG_WARN([--enable-mips-mmi: please specify 'check' or 'api';]
501	[if you want the optimizations unconditionally]
502	[pass '-mloongson-mmi -march=loongson3a' to the compiler.]);;
503	*)
504	AC_MSG_ERROR([--enable-mips-mmi=${enable_mips_mmi}:]
505	[invalid argument])
506	esac])
507
508	# Add MIPS specific files to all builds where the host_cpu is mips ('mips*') or
509	# where MIPS optimizations were explicitly requested. (This allows a fallback
510	# if a future host CPU does not match 'mips*'.)
511
512	AM_CONDITIONAL([PNG_MIPS_MMI],
513	[test "$enable_mips_mmi" != 'no' &&
514	case "$host_cpu" in
515	mipsel\|mips64el) : ;;
516	esac])
517
518	# INTEL SSE
519	# =========
520
521	AC_ARG_ENABLE([intel-sse],
522	AS_HELP_STRING([[[--enable-intel-sse]]],
523	[Enable Intel SSE optimizations: =no/off, yes/on.]
524	[no/off: disable the optimizations;]
525	[yes/on: enable the optimizations.]
526	[If not specified: determined by the compiler.]),
527	[case "$enableval" in
528	no\|off)
529	# disable the default enabling:
530	AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
531	[Disable Intel SSE optimizations])
532	# Prevent inclusion of the assembler files below:
533	enable_intel_sse=no ;;
534	yes\|on)
535	AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
536	[Enable Intel SSE optimizations]);;
537	*)
538	AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}:]
539	[invalid argument])
540	esac])
541
542	# Add Intel-specific files to all builds where $host_cpu is Intel ('x86*') or
543	# where Intel optimizations were explicitly requested. (This allows a fallback
544	# if a future host CPU does not match 'x86*'.)
545	AM_CONDITIONAL([PNG_INTEL_SSE],
546	[test "$enable_intel_sse" != 'no' &&
547	case "$host_cpu" in
548	i?86\|x86_64) : ;;
549	*) test "$enable_intel_sse" != '' ;;
550	esac])
551
552	# POWERPC VSX
553	# ===========
554
555	AC_ARG_ENABLE([powerpc-vsx],
556	AS_HELP_STRING([[[--enable-powerpc-vsx]]],
557	[Enable POWERPC VSX optimizations: =no/off, check, api, yes/on.]
558	[no/off: disable the optimizations;]
559	[check: use internal checking code;]
560	[api: disable by default, enable by a call to png_set_option;]
561	[yes/on: turn on unconditionally.]
562	[If not specified: determined by the compiler.]),
563	[case "$enableval" in
564	no\|off)
565	# disable the default enabling on __ppc64__ systems:
566	AC_DEFINE([PNG_POWERPC_VSX_OPT], [0],
567	[Disable POWERPC VSX optimizations])
568	# Prevent inclusion of the platform-specific files below:
569	enable_powerpc_vsx=no ;;
570	check)
571	AC_DEFINE([PNG_POWERPC_VSX_CHECK_SUPPORTED], [],
572	[Check for POWERPC VSX support at run-time])
573	AC_MSG_WARN([--enable-powerpc-vsx: please see contrib/powerpc/README]
574	[for the list of supported systems.]);;
575	api)
576	AC_DEFINE([PNG_POWERPC_VSX_API_SUPPORTED], [],
577	[Turn on POWERPC VSX optimizations at run-time]);;
578	yes\|on)
579	AC_DEFINE([PNG_POWERPC_VSX_OPT], [2],
580	[Enable POWERPC VSX optimizations])
581	AC_MSG_WARN([--enable-powerpc-vsx: please specify 'check' or 'api';]
582	[if you want the optimizations unconditionally,]
583	[pass '-maltivec -mvsx' or '-mcpu=power8' to the compiler.]);;
584	*)
585	AC_MSG_ERROR([--enable-powerpc-vsx=${enable_powerpc_vsx}:]
586	[invalid argument])
587	esac])
588
589	# Add PowerPC-specific files to all builds where $host_cpu is powerpc
590	# ('powerpc*') or where PowerPC optimizations were explicitly requested.
591	# (This allows a fallback if a future host CPU does not match 'powerpc*'.)
592
593	AM_CONDITIONAL([PNG_POWERPC_VSX],
594	[test "$enable_powerpc_vsx" != 'no' &&
595	case "$host_cpu" in
596	powerpc\|ppc64) : ;;
597	esac])
598
599	# LOONGARCH LSX
600	# =============
601
602	AC_ARG_ENABLE([loongarch-lsx],
603	AS_HELP_STRING([[[--enable-loongarch-lsx]]],
604	[Enable LOONGARCH LSX optimizations: =no/off, yes/on:]
605	[no/off: disable the optimizations;]
606	[yes/on: turn on unconditionally.]
607	[If not specified: determined by the compiler.]),
608	[case "$enableval" in
609	no\|off)
610	# disable the default enabling on __loongarch_simd systems:
611	AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [0],
612	[Disable LOONGARCH LSX optimizations])
613	# Prevent inclusion of the assembler files below:
614	enable_loongarch_lsx=no;;
615	yes\|on)
616	AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [1],
617	[Enable LOONGARCH LSX optimizations])
618	;;
619	*)
620	AC_MSG_ERROR([--enable-loongarch-lsx=${enable_loongarch_lsx}:]
621	[invalid argument])
622	esac])
623
624	if test "$enable_loongarch_lsx" != "no" &&
625	case "$host_cpu" in
626	loongarch*) : ;;
627	*) test "$enable_loongarch_lsx" != '' ;;
628	esac
629	then
630	compiler_support_loongarch_lsx=no
631	AC_MSG_CHECKING(whether to use LoongArch LSX intrinsics)
632	save_CFLAGS="$CFLAGS"
633	LSX_CFLAGS="${LSX_CFLAGS:-"-mlsx"}"
634	CFLAGS="$CFLAGS $LSX_CFLAGS"
635	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
636	#include <lsxintrin.h>
637	int main(){
638	__m128i a, b, c;
639	a = __lsx_vadd_w(b, c);
640	return 0;
641	}]])],compiler_support_loongarch_lsx=yes)
642	CFLAGS="$save_CFLAGS"
643	AC_MSG_RESULT($compiler_support_loongarch_lsx)
644	if test "$compiler_support_loongarch_lsx" = "yes"; then
645	AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [1],
646	[Enable LOONGARCH LSX optimizations])
647	else
648	AC_MSG_WARN([Compiler does not support loongarch LSX.])
649	fi
650	fi
651
652	# Add LoongArch specific files to all builds where the host_cpu is loongarch
653	# ('loongarch*') or where LoongArch optimizations were explicitly requested.
654	# (This allows a fallback if a future host CPU does not match 'loongarch*'.)
655
656	AM_CONDITIONAL([PNG_LOONGARCH_LSX],
657	[test "$enable_loongarch_lsx" != "no" &&
658	test "$compiler_support_loongarch_lsx" = "yes" &&
659	case "$host_cpu" in
660	loongarch*) : ;;
661	*) test "$enable_loongarch_lsx" != '' ;;
662	esac])
663
664	AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
665
666	# Config files, substituting as above
667	AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
668	AC_CONFIG_FILES([libpng-config:libpng-config.in],
669	[chmod +x libpng-config])
670
671	AC_OUTPUT

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source: vbox/trunk/src/libs/libpng-1.6.43/configure.ac@ 107044

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