357 lines
13 KiB
Plaintext
357 lines
13 KiB
Plaintext
# configure.ac
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# Copyright (c) 2004-2015 Glenn Randers-Pehrson
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# Last changed in libpng 1.6.22 [May 26, 2016]
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# This code is released under the libpng license.
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# For conditions of distribution and use, see the disclaimer
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# and license in png.h
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dnl Process this file with autoconf to produce a configure script.
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dnl
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dnl Minor upgrades (compatible ABI): increment the package version
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dnl (third field in two places below) and set the PNGLIB_RELEASE
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dnl variable.
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dnl
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dnl Major upgrades (incompatible ABI): increment the package major
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dnl version (second field, or first if desired), set the minor
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dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in
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dnl Makefile.am to upgrade the package name.
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dnl This is here to prevent earlier autoconf from being used, it
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dnl should not be necessary to regenerate configure if the time
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dnl stamps are correct
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AC_PREREQ([2.68])
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dnl Version number stuff here:
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AC_INIT([libpng],[1.6.24rc02],[png-mng-implement@lists.sourceforge.net])
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AC_CONFIG_MACRO_DIR([scripts])
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# libpng does not follow GNU file name conventions (hence 'foreign')
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# color-tests requires automake 1.11 or later
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# silent-rules requires automake 1.11 or later
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# dist-xz requires automake 1.11 or later
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# 1.12.2 fixes a security issue in 1.11.2 and 1.12.1
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# 1.13 is required for parallel tests
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AM_INIT_AUTOMAKE([1.13 foreign dist-xz color-tests silent-rules subdir-objects])
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# The following line causes --disable-maintainer-mode to be the default to
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# configure. This is necessary because libpng distributions cannot rely on the
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# time stamps of the autotools generated files being correct
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AM_MAINTAINER_MODE
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dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later
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dnl version; aclocal.m4 will generate a failure if you use a prior version of
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dnl automake, so the following is not necessary (and is not defined anyway):
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dnl AM_PREREQ([1.11.2])
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dnl stop configure from automagically running automake
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PNGLIB_VERSION=1.6.24rc02
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PNGLIB_MAJOR=1
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PNGLIB_MINOR=6
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PNGLIB_RELEASE=24
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dnl End of version number stuff
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AC_CONFIG_SRCDIR([pngget.c])
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AC_CONFIG_HEADERS([config.h])
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# Checks for programs.
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AC_LANG([C])
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AC_PROG_CC
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AM_PROG_AS
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LT_PATH_LD
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AC_PROG_CPP
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AC_PROG_AWK
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AC_PROG_INSTALL
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AC_PROG_LN_S
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AC_PROG_MAKE_SET
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dnl libtool/libtoolize; version 2.4.2 is the tested version. This or any
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dnl compatible later version may be used
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LT_INIT([win32-dll])
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LT_PREREQ([2.4.2])
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# Some awks crash when confronted with pnglibconf.dfa, do a test run now
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# to make sure this doesn't happen
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AC_MSG_CHECKING([that AWK works])
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if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\
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${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
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${srcdir}/pngusr.dfa 1>&2
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then
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AC_MSG_RESULT([ok])
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else
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AC_MSG_FAILURE([failed], 1)
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fi
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# This is a remnant of the old cc -E validation, where it may have been
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# necessary to use a different preprocessor for .dfn files
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DFNCPP="$CPP"
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AC_SUBST(DFNCPP)
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# -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
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# checks the compiler with a program that generates a warning), add the
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# following option to deal with this
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AC_ARG_VAR(PNG_COPTS,
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[additional flags for the C compiler, use this for options that would]
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[cause configure itself to fail])
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AC_ARG_ENABLE(werror,
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AS_HELP_STRING([[[--enable-werror[=OPT]]]],
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[Pass -Werror or the given argument to the compiler if it is supported]),
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[test "$enable_werror" = "yes" && enable_werror="-Werror"
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if test "$enable_werror" != "no"; then
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sav_CFLAGS="$CFLAGS"
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CFLAGS="$enable_werror $CFLAGS"
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AC_MSG_CHECKING([if the compiler allows $enable_werror])
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AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE([
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[int main(int argc, char **argv){]
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[return argv[argc-1][0];]
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[}]])],
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AC_MSG_RESULT(yes)
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PNG_COPTS="$PNG_COPTS $enable_werror",
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AC_MSG_RESULT(no))
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CFLAGS="$sav_CFLAGS"
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fi],)
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# For GCC 5 the default mode for C is -std=gnu11 instead of -std=gnu89
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# In pngpriv.h we request just the POSIX 1003.1 and C89 APIs by defining _POSIX_SOURCE to 1
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# This is incompatible with the new default mode, so we test for that and force the
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# "-std=c89" compiler option:
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AC_MSG_CHECKING([if we need to force back C standard to C89])
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([
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[#define _POSIX_SOURCE 1]
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[#include <stdio.h>]
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])],
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AC_MSG_RESULT(no),[
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if test "x$GCC" != "xyes"; then
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AC_MSG_ERROR(
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[Forcing back to C89 is required but the flags are only known for GCC])
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fi
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AC_MSG_RESULT(yes)
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CFLAGS="$CFLAGS -std=c89"
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])
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# Checks for header files.
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AC_HEADER_STDC
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# Checks for typedefs, structures, and compiler characteristics.
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AC_C_CONST
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AC_TYPE_SIZE_T
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AC_STRUCT_TM
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AC_C_RESTRICT
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# Checks for library functions.
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AC_FUNC_STRTOD
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AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc))
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AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) )
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# Some later POSIX 1003.1 functions are required for test programs, failure here
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# is soft (the corresponding test program is not built).
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AC_CHECK_FUNC([clock_gettime],,[AC_MSG_WARN([not building timepng])])
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AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"])
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AC_ARG_WITH(zlib-prefix,
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AS_HELP_STRING([[[--with-zlib-prefix]]],
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[prefix that may have been used in installed zlib]),
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[ZPREFIX=${withval}],
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[ZPREFIX='z_'])
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AC_CHECK_LIB(z, zlibVersion, ,
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AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed)))
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# The following is for pngvalid, to ensure it catches FP errors even on
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# platforms that don't enable FP exceptions, the function appears in the math
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# library (typically), it's not an error if it is not found.
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AC_CHECK_LIB([m], [feenableexcept])
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AC_CHECK_FUNCS([feenableexcept])
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AC_MSG_CHECKING([if using Solaris linker])
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SLD=`$LD --version 2>&1 | grep Solaris`
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if test "$SLD"; then
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have_solaris_ld=yes
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AC_MSG_RESULT(yes)
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else
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have_solaris_ld=no
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AC_MSG_RESULT(no)
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fi
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AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
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AC_MSG_CHECKING([if libraries can be versioned])
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# Special case for PE/COFF platforms: ld reports
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# support for version-script, but doesn't actually
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# DO anything with it.
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case $host in
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*cygwin* | *mingw32* | *interix* )
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have_ld_version_script=no
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AC_MSG_RESULT(no)
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;;
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* )
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if test "$have_solaris_ld" = "yes"; then
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GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
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else
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GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
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fi
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if test "$GLD"; then
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have_ld_version_script=yes
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AC_MSG_RESULT(yes)
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else
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have_ld_version_script=no
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AC_MSG_RESULT(no)
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AC_MSG_WARN(*** You have not enabled versioned symbols.)
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fi
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;;
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esac
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AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
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if test "$have_ld_version_script" = "yes"; then
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AC_MSG_CHECKING([for symbol prefix])
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SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
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| ${CPP-${CC-gcc} -E} - 2>&1 \
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| ${EGREP-grep} "^PREFIX=" \
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| ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
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AC_SUBST(SYMBOL_PREFIX)
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AC_MSG_RESULT($SYMBOL_PREFIX)
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fi
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# Substitutions for .in files
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AC_SUBST(PNGLIB_VERSION)
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AC_SUBST(PNGLIB_MAJOR)
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AC_SUBST(PNGLIB_MINOR)
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AC_SUBST(PNGLIB_RELEASE)
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# Additional arguments (and substitutions)
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# Allow the pkg-config directory to be set
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AC_ARG_WITH(pkgconfigdir,
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AS_HELP_STRING([[[--with-pkgconfigdir]]],
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[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
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[pkgconfigdir=${withval}],
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[pkgconfigdir='${libdir}/pkgconfig'])
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AC_SUBST([pkgconfigdir])
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AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])
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# Make the *-config binary config scripts optional
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AC_ARG_WITH(binconfigs,
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AS_HELP_STRING([[[--with-binconfigs]]],
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[Generate shell libpng-config scripts as well as pkg-config data]
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[@<:@default=yes@:>@]),
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[if test "${withval}" = no; then
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binconfigs=
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AC_MSG_NOTICE([[libpng-config scripts will not be built]])
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else
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binconfigs='${binconfigs}'
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fi],
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[binconfigs='${binconfigs}'])
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AC_SUBST([binconfigs])
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# Support for prefixes to the API function names; this will generate defines
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# at the start of the build to rename exported library functions
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AC_ARG_WITH(libpng-prefix,
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AS_HELP_STRING([[[--with-libpng-prefix]]],
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[prefix libpng exported function (API) names with the given value]),
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[if test "${withval:-no}" != "no"; then
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AC_SUBST([PNG_PREFIX], [${withval}])
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fi])
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AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
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# Control over what links are made for installed files. Versioned files are
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# always installed, when the following options are turned on corresponding
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# unversioned links are also created (normally as symbolic links):
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AC_ARG_ENABLE([unversioned-links],
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AS_HELP_STRING([[[--enable-unversioned-links]]],
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[Installed libpng header files are placed in a versioned subdirectory]
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[and installed libpng library (including DLL) files are versioned.]
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[If this option is enabled unversioned links will be created pointing to]
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[the corresponding installed files. If you use libpng.pc or]
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[libpng-config for all builds you do not need these links, but if you]
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[compile programs directly they will typically #include <png.h> and]
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[link with -lpng; in that case you need the links.]
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[The links can be installed manually using 'make install-header-links']
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[and 'make install-library-links' and can be removed using the]
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[corresponding uninstall- targets. If you do enable this option every]
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[libpng 'make install' will recreate the links to point to the just]
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[installed version of libpng. The default is to create the links;]
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[use --disable-unversioned-links to change this]))
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# The AM_CONDITIONAL test is written so that the default is enabled;
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# --disable-unversioned-links must be given to turn the option off.
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AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"])
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AC_ARG_ENABLE([unversioned-libpng-pc],
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AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]],
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[Install the configuration file 'libpng.pc' as a link to the versioned]
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[version. This is done by default - use --disable-unversioned-libpng-pc]
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[to change this.]))
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AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC],
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[test "$enable_unversioned_libpng_pc" != "no"])
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AC_ARG_ENABLE([unversioned-libpng-config],
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AS_HELP_STRING([[[--enable-unversioned-libpng-config]]],
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[Install the configuration file 'libpng-config' as a link to the]
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[versioned version. This is done by default - use]
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[--disable-unversioned-libpng-config to change this.]))
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AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
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[test "$enable_unversioned_libpng_config" != "no"])
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# HOST SPECIFIC OPTIONS
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# =====================
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#
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# ARM
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# ===
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#
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# ARM NEON (SIMD) support.
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AC_ARG_ENABLE([arm-neon],
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AS_HELP_STRING([[[--enable-arm-neon]]],
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[Enable ARM NEON optimizations: =no/off, check, api, yes/on:]
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[no/off: disable the optimizations; check: use internal checking code]
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[(deprecated and poorly supported); api: disable by default, enable by]
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[a call to png_set_option; yes/on: turn on unconditionally.]
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[If not specified: determined by the compiler.]),
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[case "$enableval" in
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no|off)
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# disable the default enabling on __ARM_NEON__ systems:
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AC_DEFINE([PNG_ARM_NEON_OPT], [0],
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[Disable ARM Neon optimizations])
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# Prevent inclusion of the assembler files below:
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enable_arm_neon=no;;
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check)
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AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
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[Check for ARM Neon support at run-time]);;
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api)
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AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
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[Turn on ARM Neon optimizations at run-time]);;
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yes|on)
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AC_DEFINE([PNG_ARM_NEON_OPT], [2],
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[Enable ARM Neon optimizations])
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AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if]
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[you want the optimizations unconditionally pass -mfpu=neon]
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[to the compiler.]);;
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*)
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AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value])
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esac])
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# Add ARM specific files to all builds where the host_cpu is arm ('arm*') or
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# where ARM optimizations were explicitly requested (this allows a fallback if a
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# future host CPU does not match 'arm*')
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AM_CONDITIONAL([PNG_ARM_NEON],
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[test "$enable_arm_neon" != 'no' &&
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case "$host_cpu" in
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arm*|aarch64*) :;;
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*) test "$enable_arm_neon" != '';;
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esac])
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AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
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# Config files, substituting as above
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AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
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AC_CONFIG_FILES([libpng-config:libpng-config.in],
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[chmod +x libpng-config])
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AC_OUTPUT
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