configure.ac - third_party/libpng - Git at Google

 # configure.ac

 dnl Process this file with autoconf to produce a configure script.
 dnl
 dnl Minor upgrades (compatible ABI): increment the package version
 dnl (third field in two places below) and set the PNGLIB_RELEASE
 dnl variable.
 dnl
 dnl Major upgrades (incompatible ABI): increment the package major
 dnl version (second field, or first if desired), set the minor
 dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in
 dnl Makefile.am to upgrade the package name.

 dnl This is here to prevent earlier autoconf from being used, it
 dnl should not be necessary to regenerate configure if the time
 dnl stamps are correct
 AC_PREREQ([2.68])

 dnl Version number stuff here:

 AC_INIT([libpng],[1.6.0beta19],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])

 # libpng does not follow GNU file name conventions (hence 'foreign')
 # color-tests requires automake 1.11 or later
 # silent-rules requires automake 1.11 or later
 # dist-xz requires automake 1.11 or later
 # 1.11.1 fixes a security issue in 1.11
 AM_INIT_AUTOMAKE([1.11.1 foreign dist-xz dist-bzip2 color-tests silent-rules])
 # was:
 # AM_INIT_AUTOMAKE
 AM_MAINTAINER_MODE

 dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later
 dnl version; aclocal.m4 will generate a failure if you use a prior version of
 dnl automake, so the following is not necessary (and is not defined anyway):
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake

 PNGLIB_VERSION=1.6.0beta19
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=0

 dnl End of version number stuff

 AC_CONFIG_SRCDIR([pngget.c])
 AC_CONFIG_HEADERS([config.h])

 # Checks for programs.
 AC_LANG([C])
 AC_PROG_CC
 AM_PROG_AS
 LT_PATH_LD
 AC_PROG_CPP
 AC_CHECK_TOOL(SED, sed, :)
 AC_CHECK_TOOL(AWK, awk, :)
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET

 dnl libtool/libtoolize; version 2.4.2 is the tested version, this or any
 dnl compatible later version may be used
 LT_INIT([win32-dll])
 LT_PREREQ([2.4.2])

 # On Solaris 10 and 12 CPP gets set to cc -E, however this still
 # does some input parsing.  We need strict ANSI-C style tokenization,
 # check this:
 AC_REQUIRE_CPP
 AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
 AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])],
    [DFNCPP="$CPP"],
    [  DFNCPP=""
       sav_CPP="$CPP"
       for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"
       do
          AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])],
             [DFNCPP="$CPP"]
             [break],,)
       done
       CPP="$sav_CPP"
    ])
 if test -n "$DFNCPP"; then
    AC_MSG_RESULT([$DFNCPP])
    AC_SUBST(DFNCPP)
 else
    AC_MSG_FAILURE([not found], 1)
 fi

 # -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
 # checks the compiler with a program that generates a warning), add the
 # following option to deal with this
 AC_ARG_VAR(PNG_COPTS,
    [additional flags for the C compiler, use this for options that would]
    [cause configure itself to fail])
 AC_ARG_ENABLE(werror,
    AS_HELP_STRING([[[--enable-werror[=OPT]]]],
       [Pass -Werror or the given argument to the compiler if it is supported]),
    [test "$enable_werror" = "yes" && enable_werror="-Werror"
     if test "$enable_werror" != "no"; then
       sav_CFLAGS="$CFLAGS"
       CFLAGS="$enable_werror $CFLAGS"
       AC_MSG_CHECKING([if the compiler allows $enable_werror])
       AC_COMPILE_IFELSE(
          [AC_LANG_SOURCE([
             [int main(int argc, char **argv){]
             [return argv[argc-1][0];]
             [}]])],
          AC_MSG_RESULT(yes)
          PNG_COPTS="$PNG_COPTS $enable_werror",
          AC_MSG_RESULT(no))
       CFLAGS="$sav_CFLAGS"
     fi],)

 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])

 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_TYPE_SIZE_T
 AC_STRUCT_TM
 AC_C_RESTRICT

 # Checks for library functions.
 AC_FUNC_STRTOD
 AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc))
 AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) )
 AC_ARG_WITH(zlib-prefix,
    AS_HELP_STRING([[[--with-zlib-prefix]]],
       [prefix that may have been used in installed zlib]),
       [ZPREFIX=${withval}],
       [ZPREFIX='z_'])
 AC_CHECK_LIB(z, zlibVersion, ,
     AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed)))

 # The following is for pngvalid, to ensure it catches FP errors even on
 # platforms that don't enable FP exceptions, the function appears in the math
 # library (typically), it's not an error if it is not found.
 AC_CHECK_LIB([m], [feenableexcept])
 AC_CHECK_FUNCS([feenableexcept])

 AC_MSG_CHECKING([if using Solaris linker])
 SLD=`$LD --version 2>&1 | grep Solaris`
 if test "$SLD"; then
     have_solaris_ld=yes
     AC_MSG_RESULT(yes)
 else
     have_solaris_ld=no
     AC_MSG_RESULT(no)
 fi
 AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")

 AC_MSG_CHECKING([if libraries can be versioned])
 # Special case for PE/COFF platforms: ld reports
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
 *cygwin* | *mingw32* | *interix* )
     have_ld_version_script=no
     AC_MSG_RESULT(no)
 ;;
 * )

 if test "$have_solaris_ld" = "yes"; then
     GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
 else
     GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
 fi

 if test "$GLD"; then
     have_ld_version_script=yes
     AC_MSG_RESULT(yes)
 else
     have_ld_version_script=no
     AC_MSG_RESULT(no)
     AC_MSG_WARN(*** You have not enabled versioned symbols.)
 fi
 ;;
 esac

 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

 if test "$have_ld_version_script" = "yes"; then
     AC_MSG_CHECKING([for symbol prefix])
     SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
                    | ${CPP-${CC-gcc} -E} - 2>&1 \
                    | ${EGREP-grep} "^PREFIX=" \
                    | ${SED-sed} "s:^PREFIX=::"`
     AC_SUBST(SYMBOL_PREFIX)
     AC_MSG_RESULT($SYMBOL_PREFIX)
 fi

 # Substitutions for .in files
 AC_SUBST(PNGLIB_VERSION)
 AC_SUBST(PNGLIB_MAJOR)
 AC_SUBST(PNGLIB_MINOR)
 AC_SUBST(PNGLIB_RELEASE)

 # Additional arguments (and substitutions)
 # Allow the pkg-config directory to be set
 AC_ARG_WITH(pkgconfigdir,
    AS_HELP_STRING([[[--with-pkgconfigdir]]],
       [Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
    [pkgconfigdir=${withval}],
    [pkgconfigdir='${libdir}/pkgconfig'])

 AC_SUBST([pkgconfigdir])
 AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])

 # Make the *-config binary config scripts optional
 AC_ARG_WITH(binconfigs,
    AS_HELP_STRING([[[--with-binconfigs]]],
       [Generate shell libpng-config scripts as well as pkg-config data]
       [@<:@default=yes@:>@]),
    [if test "${withval}" = no; then
       binconfigs=
       AC_MSG_NOTICE([[libpng-config scripts will not be built]])
     else
       binconfigs='${binconfigs}'
     fi],
    [binconfigs='${binconfigs}'])
 AC_SUBST([binconfigs])

 # Support for prefixes to the API function names; this will generate defines
 # at the start of the build to rename exported library functions
 AC_ARG_WITH(libpng-prefix,
    AS_HELP_STRING([[[--with-libpng-prefix]]],
       [prefix libpng exported function (API) names with the given value]),
    [if test "${withval:-no}" != "no"; then
       AC_SUBST([PNG_PREFIX], [${withval}])
     fi])
 AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])

 # Because GCC by default assembles code with an executable stack, even though it
 # compiles C code with a non-executable stack, it is necessary to do a fixup
 # here (this may by GCC specific)
 AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])

 AC_ARG_ENABLE([arm-neon],
    AS_HELP_STRING([[[--enable-arm-neon]]], [Enable ARM NEON optimizations]),
    [if test "${enableval}" = "yes"; then
       AC_DEFINE([PNG_ARM_NEON], [1], [Enable ARM NEON optimizations])
       AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [1], [Align row buffers])
     fi])
 AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" = yes])

 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])

 # Config files, substituting as above
 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
 AC_CONFIG_FILES([libpng-config:libpng-config.in],
    [chmod +x libpng-config])

 AC_OUTPUT
	# configure.ac

	dnl Process this file with autoconf to produce a configure script.
	dnl
	dnl Minor upgrades (compatible ABI): increment the package version
	dnl (third field in two places below) and set the PNGLIB_RELEASE
	dnl variable.
	dnl
	dnl Major upgrades (incompatible ABI): increment the package major
	dnl version (second field, or first if desired), set the minor
	dnl to 0, set PNGLIB_MAJOR below and follow the instructions in
	dnl Makefile.am to upgrade the package name.

	dnl This is here to prevent earlier autoconf from being used, it
	dnl should not be necessary to regenerate configure if the time
	dnl stamps are correct
	AC_PREREQ([2.68])

	dnl Version number stuff here:

	AC_INIT([libpng],[1.6.0beta19],[png-mng-implement@lists.sourceforge.net])
	AC_CONFIG_MACRO_DIR([scripts])

	# libpng does not follow GNU file name conventions (hence 'foreign')
	# color-tests requires automake 1.11 or later
	# silent-rules requires automake 1.11 or later
	# dist-xz requires automake 1.11 or later
	# 1.11.1 fixes a security issue in 1.11
	AM_INIT_AUTOMAKE([1.11.1 foreign dist-xz dist-bzip2 color-tests silent-rules])
	# was:
	# AM_INIT_AUTOMAKE
	AM_MAINTAINER_MODE

	dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later
	dnl version; aclocal.m4 will generate a failure if you use a prior version of
	dnl automake, so the following is not necessary (and is not defined anyway):
	dnl AM_PREREQ([1.11.2])
	dnl stop configure from automagically running automake

	PNGLIB_VERSION=1.6.0beta19
	PNGLIB_MAJOR=1
	PNGLIB_MINOR=6
	PNGLIB_RELEASE=0

	dnl End of version number stuff

	AC_CONFIG_SRCDIR([pngget.c])
	AC_CONFIG_HEADERS([config.h])

	# Checks for programs.
	AC_LANG([C])
	AC_PROG_CC
	AM_PROG_AS
	LT_PATH_LD
	AC_PROG_CPP
	AC_CHECK_TOOL(SED, sed, :)
	AC_CHECK_TOOL(AWK, awk, :)
	AC_PROG_INSTALL
	AC_PROG_LN_S
	AC_PROG_MAKE_SET

	dnl libtool/libtoolize; version 2.4.2 is the tested version, this or any
	dnl compatible later version may be used
	LT_INIT([win32-dll])
	LT_PREREQ([2.4.2])

	# On Solaris 10 and 12 CPP gets set to cc -E, however this still
	# does some input parsing. We need strict ANSI-C style tokenization,
	# check this:
	AC_REQUIRE_CPP
	AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
	AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])],
	[DFNCPP="$CPP"],
	[ DFNCPP=""
	sav_CPP="$CPP"
	for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"
	do
	AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])],
	[DFNCPP="$CPP"]
	[break],,)
	done
	CPP="$sav_CPP"
	])
	if test -n "$DFNCPP"; then
	AC_MSG_RESULT([$DFNCPP])
	AC_SUBST(DFNCPP)
	else
	AC_MSG_FAILURE([not found], 1)
	fi

	# -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
	# checks the compiler with a program that generates a warning), add the
	# following option to deal with this
	AC_ARG_VAR(PNG_COPTS,
	[additional flags for the C compiler, use this for options that would]
	[cause configure itself to fail])
	AC_ARG_ENABLE(werror,
	AS_HELP_STRING([[[--enable-werror[=OPT]]]],
	[Pass -Werror or the given argument to the compiler if it is supported]),
	[test "$enable_werror" = "yes" && enable_werror="-Werror"
	if test "$enable_werror" != "no"; then
	sav_CFLAGS="$CFLAGS"
	CFLAGS="$enable_werror $CFLAGS"
	AC_MSG_CHECKING([if the compiler allows $enable_werror])
	AC_COMPILE_IFELSE(
	[AC_LANG_SOURCE([
	[int main(int argc, char **argv){]
	[return argv[argc-1][0];]
	[}]])],
	AC_MSG_RESULT(yes)
	PNG_COPTS="$PNG_COPTS $enable_werror",
	AC_MSG_RESULT(no))
	CFLAGS="$sav_CFLAGS"
	fi],)

	# Checks for header files.
	AC_HEADER_STDC
	AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])

	# Checks for typedefs, structures, and compiler characteristics.
	AC_C_CONST
	AC_TYPE_SIZE_T
	AC_STRUCT_TM
	AC_C_RESTRICT

	# Checks for library functions.
	AC_FUNC_STRTOD
	AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc))
	AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) )
	AC_ARG_WITH(zlib-prefix,
	AS_HELP_STRING([[[--with-zlib-prefix]]],
	[prefix that may have been used in installed zlib]),
	[ZPREFIX=${withval}],
	[ZPREFIX='z_'])
	AC_CHECK_LIB(z, zlibVersion, ,
	AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed)))

	# The following is for pngvalid, to ensure it catches FP errors even on
	# platforms that don't enable FP exceptions, the function appears in the math
	# library (typically), it's not an error if it is not found.
	AC_CHECK_LIB([m], [feenableexcept])
	AC_CHECK_FUNCS([feenableexcept])

	AC_MSG_CHECKING([if using Solaris linker])
	SLD=`$LD --version 2>&1 \| grep Solaris`
	if test "$SLD"; then
	have_solaris_ld=yes
	AC_MSG_RESULT(yes)
	else
	have_solaris_ld=no
	AC_MSG_RESULT(no)
	fi
	AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")

	AC_MSG_CHECKING([if libraries can be versioned])
	# Special case for PE/COFF platforms: ld reports
	# support for version-script, but doesn't actually
	# DO anything with it.
	case $host in
	cygwin \| mingw32 \| interix )
	have_ld_version_script=no
	AC_MSG_RESULT(no)
	;;
	* )

	if test "$have_solaris_ld" = "yes"; then
	GLD=`$LD --help < /dev/null 2>&1 \| grep 'M mapfile'`
	else
	GLD=`$LD --help < /dev/null 2>/dev/null \| grep version-script`
	fi

	if test "$GLD"; then
	have_ld_version_script=yes
	AC_MSG_RESULT(yes)
	else
	have_ld_version_script=no
	AC_MSG_RESULT(no)
	AC_MSG_WARN(*** You have not enabled versioned symbols.)
	fi
	;;
	esac

	AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

	if test "$have_ld_version_script" = "yes"; then
	AC_MSG_CHECKING([for symbol prefix])
	SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
	\| ${CPP-${CC-gcc} -E} - 2>&1 \
	\| ${EGREP-grep} "^PREFIX=" \
	\| ${SED-sed} "s:^PREFIX=::"`
	AC_SUBST(SYMBOL_PREFIX)
	AC_MSG_RESULT($SYMBOL_PREFIX)
	fi

	# Substitutions for .in files
	AC_SUBST(PNGLIB_VERSION)
	AC_SUBST(PNGLIB_MAJOR)
	AC_SUBST(PNGLIB_MINOR)
	AC_SUBST(PNGLIB_RELEASE)

	# Additional arguments (and substitutions)
	# Allow the pkg-config directory to be set
	AC_ARG_WITH(pkgconfigdir,
	AS_HELP_STRING([[[--with-pkgconfigdir]]],
	[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
	[pkgconfigdir=${withval}],
	[pkgconfigdir='${libdir}/pkgconfig'])

	AC_SUBST([pkgconfigdir])
	AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])

	# Make the *-config binary config scripts optional
	AC_ARG_WITH(binconfigs,
	AS_HELP_STRING([[[--with-binconfigs]]],
	[Generate shell libpng-config scripts as well as pkg-config data]
	[@<:@default=yes@:>@]),
	[if test "${withval}" = no; then
	binconfigs=
	AC_MSG_NOTICE([[libpng-config scripts will not be built]])
	else
	binconfigs='${binconfigs}'
	fi],
	[binconfigs='${binconfigs}'])
	AC_SUBST([binconfigs])

	# Support for prefixes to the API function names; this will generate defines
	# at the start of the build to rename exported library functions
	AC_ARG_WITH(libpng-prefix,
	AS_HELP_STRING([[[--with-libpng-prefix]]],
	[prefix libpng exported function (API) names with the given value]),
	[if test "${withval:-no}" != "no"; then
	AC_SUBST([PNG_PREFIX], [${withval}])
	fi])
	AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])

	# Because GCC by default assembles code with an executable stack, even though it
	# compiles C code with a non-executable stack, it is necessary to do a fixup
	# here (this may by GCC specific)
	AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])

	AC_ARG_ENABLE([arm-neon],
	AS_HELP_STRING([[[--enable-arm-neon]]], [Enable ARM NEON optimizations]),
	[if test "${enableval}" = "yes"; then
	AC_DEFINE([PNG_ARM_NEON], [1], [Enable ARM NEON optimizations])
	AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [1], [Align row buffers])
	fi])
	AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" = yes])

	AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])

	# Config files, substituting as above
	AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
	AC_CONFIG_FILES([libpng-config:libpng-config.in],
	[chmod +x libpng-config])

	AC_OUTPUT