expat/configure.ac - third_party/expat - Git at Google

 dnl   configuration script for expat
 dnl   Process this file with autoconf to produce a configure script.
 dnl
 dnl   Copyright 2000 Clark Cooper
 dnl
 dnl   This file is part of EXPAT.
 dnl
 dnl   EXPAT is free software; you can redistribute it and/or modify it
 dnl   under the terms of the License (based on the MIT/X license) contained
 dnl   in the file COPYING that comes with this distribution.
 dnl

 dnl Ensure that Expat is configured with autoconf 2.58 or newer
 AC_PREREQ(2.58)

 dnl Get the version number of Expat, using m4's esyscmd() command to run
 dnl the command at m4-generation time. This allows us to create an m4
 dnl symbol holding the correct version number. AC_INIT() requires the
 dnl version number at m4-time, rather than when ./configure is run, so
 dnl all this must happen as part of m4, not as part of the shell code
 dnl contained in ./configure.
 dnl
 dnl NOTE: esyscmd() is a GNU M4 extension. Thus, we wrap it in an appropriate
 dnl test. I believe this test will work, but I don't have a place with non-
 dnl GNU M4 to test it right now.
 define([expat_version], ifdef([__gnu__],
                               [esyscmd(conftools/get-version.sh lib/expat.h)],
                               [2.2.x]))
 AC_INIT(expat, expat_version, expat-bugs@libexpat.org)
 undefine([expat_version])

 AC_CONFIG_SRCDIR(Makefile.in)
 AC_CONFIG_AUX_DIR(conftools)
 AC_CONFIG_MACRO_DIR([m4])


 dnl
 dnl Increment LIBREVISION if source code has changed at all
 dnl
 dnl If the API has changed, increment LIBCURRENT and set LIBREVISION to 0
 dnl
 dnl If the API changes compatibly (i.e. simply adding a new function
 dnl without changing or removing earlier interfaces), then increment LIBAGE.
 dnl
 dnl If the API changes incompatibly set LIBAGE back to 0
 dnl

 LIBCURRENT=7   # sync
 LIBREVISION=5  # with
 LIBAGE=6       # CMakeLists.txt!

 AC_CONFIG_HEADER(expat_config.h)

 sinclude(conftools/ac_c_bigendian_cross.m4)

 AC_LIBTOOL_WIN32_DLL
 AC_PROG_LIBTOOL

 AC_SUBST(LIBCURRENT)
 AC_SUBST(LIBREVISION)
 AC_SUBST(LIBAGE)

 dnl Checks for programs.
 AC_PROG_CC_C99
 AC_PROG_CXX
 AC_PROG_INSTALL

 if test "$GCC" = yes ; then
     dnl
     dnl Be careful about adding the -fexceptions option; some versions of
     dnl GCC don't support it and it causes extra warnings that are only
     dnl distracting; avoid.
     dnl
     OLDCFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wstrict-prototypes"
     CFLAGS="$OLDCFLAGS -fexceptions"
     AC_MSG_CHECKING(whether $CC accepts -fexceptions)
     AC_TRY_LINK( , ,
                    AC_MSG_RESULT(yes),
                    AC_MSG_RESULT(no); CFLAGS="$OLDCFLAGS")
     if test "x$CXXFLAGS" = x ; then
     CXXFLAGS=`echo "$CFLAGS" | sed 's/ -Wmissing-prototypes -Wstrict-prototypes//'`
     fi

     CFLAGS="${CFLAGS} -fno-strict-aliasing"
     CXXFLAGS="${CXXFLAGS} -fno-strict-aliasing"
     LDFLAGS="${LDFLAGS} -fno-strict-aliasing"
 fi

 dnl Checks for header files.
 AC_HEADER_STDC

 dnl Checks for typedefs, structures, and compiler characteristics.

 dnl Note: Avoid using AC_C_BIGENDIAN because it does not
 dnl work in a cross compile.
 AC_C_BIGENDIAN_CROSS

 AC_C_CONST
 AC_TYPE_SIZE_T
 AC_CHECK_FUNCS(memmove bcopy)


 AC_ARG_WITH([libbsd], [
 AS_HELP_STRING([--with-libbsd], [utilize libbsd (for arc4random_buf)])
 ], [], [with_libbsd=no])
 AS_IF([test "x${with_libbsd}" != xno], [
   AC_CHECK_LIB([bsd], [arc4random_buf], [], [
     AS_IF([test "x${with_libbsd}" = xyes], [
       AC_MSG_ERROR([Enforced use of libbsd cannot be satisfied.])
     ])
   ])
 ])
 AC_MSG_CHECKING([for arc4random_buf (BSD or libbsd)])
 AC_LINK_IFELSE([AC_LANG_SOURCE([
   #include <stdlib.h>  /* for arc4random_buf on BSD, for NULL */
   #if defined(HAVE_LIBBSD)
   # include <bsd/stdlib.h>
   #endif
   int main() {
     arc4random_buf(NULL, 0U);
     return 0;
   }
 ])], [
     AC_DEFINE([HAVE_ARC4RANDOM_BUF], [1],
         [Define to 1 if you have the `arc4random_buf' function.])
     AC_MSG_RESULT([yes])
 ], [
     AC_MSG_RESULT([no])

     AC_MSG_CHECKING([for arc4random (BSD, macOS or libbsd)])
     AC_LINK_IFELSE([AC_LANG_SOURCE([
       #if defined(HAVE_LIBBSD)
       # include <bsd/stdlib.h>
       #else
       # include <stdlib.h>
       #endif
       int main() {
           arc4random();
           return 0;
       }
     ])], [
         AC_DEFINE([HAVE_ARC4RANDOM], [1],
             [Define to 1 if you have the `arc4random' function.])
         AC_MSG_RESULT([yes])
     ], [
         AC_MSG_RESULT([no])
     ])
 ])


 AC_MSG_CHECKING([for getrandom (Linux 3.17+, glibc 2.25+)])
 AC_LINK_IFELSE([AC_LANG_SOURCE([
   #include <stdlib.h>  /* for NULL */
   #include <sys/random.h>
   int main() {
     return getrandom(NULL, 0U, 0U);
   }
 ])], [
     AC_DEFINE([HAVE_GETRANDOM], [1],
         [Define to 1 if you have the `getrandom' function.])
     AC_MSG_RESULT([yes])
 ], [
     AC_MSG_RESULT([no])

     AC_MSG_CHECKING([for syscall SYS_getrandom (Linux 3.17+)])
     AC_LINK_IFELSE([AC_LANG_SOURCE([
       #include <stdlib.h>  /* for NULL */
       #include <unistd.h>  /* for syscall */
       #include <sys/syscall.h>  /* for SYS_getrandom */
       int main() {
         syscall(SYS_getrandom, NULL, 0, 0);
         return 0;
       }
     ])], [
         AC_DEFINE([HAVE_SYSCALL_GETRANDOM], [1],
             [Define to 1 if you have `syscall' and `SYS_getrandom'.])
         AC_MSG_RESULT([yes])
     ], [
         AC_MSG_RESULT([no])
     ])
 ])


 dnl Only needed for xmlwf:
 AC_CHECK_HEADERS(fcntl.h unistd.h)
 AC_TYPE_OFF_T
 AC_FUNC_MMAP

 if test "$ac_cv_func_mmap_fixed_mapped" = "yes"; then
     FILEMAP=unixfilemap
 else
     FILEMAP=readfilemap
 fi
 AC_SUBST(FILEMAP)


 dnl Some basic configuration:
 AC_DEFINE([XML_NS], 1,
           [Define to make XML Namespaces functionality available.])
 AC_DEFINE([XML_DTD], 1,
           [Define to make parameter entity parsing functionality available.])
 AC_DEFINE([XML_DEV_URANDOM], 1,
           [Define to include code reading entropy from `/dev/urandom'.])

 AC_ARG_ENABLE([xml-context],
   AS_HELP_STRING([--enable-xml-context @<:@COUNT@:>@],
     [Retain context around the current parse point;
         default is enabled and a size of 1024 bytes])
 AS_HELP_STRING([--disable-xml-context],
     [Do not retain context around the current parse point]),
   [enable_xml_context=${enableval}])
 AS_IF([test "x${enable_xml_context}" != "xno"], [
   AS_IF([test "x${enable_xml_context}" = "xyes" \
       -o "x${enable_xml_context}" = "x"], [
     enable_xml_context=1024
   ])
   AC_DEFINE_UNQUOTED([XML_CONTEXT_BYTES], [${enable_xml_context}],
     [Define to specify how much context to retain around the current parse point.])
 ])

 AC_CONFIG_FILES([Makefile expat.pc])
 AC_CONFIG_FILES([run.sh], [chmod +x run.sh])
 AC_OUTPUT

 abs_srcdir="`cd $srcdir && pwd`"
 abs_builddir="`pwd`"
 if test "$abs_srcdir" != "$abs_builddir"; then
   make mkdir-init
 fi
	dnl configuration script for expat
	dnl Process this file with autoconf to produce a configure script.
	dnl
	dnl Copyright 2000 Clark Cooper
	dnl
	dnl This file is part of EXPAT.
	dnl
	dnl EXPAT is free software; you can redistribute it and/or modify it
	dnl under the terms of the License (based on the MIT/X license) contained
	dnl in the file COPYING that comes with this distribution.
	dnl

	dnl Ensure that Expat is configured with autoconf 2.58 or newer
	AC_PREREQ(2.58)

	dnl Get the version number of Expat, using m4's esyscmd() command to run
	dnl the command at m4-generation time. This allows us to create an m4
	dnl symbol holding the correct version number. AC_INIT() requires the
	dnl version number at m4-time, rather than when ./configure is run, so
	dnl all this must happen as part of m4, not as part of the shell code
	dnl contained in ./configure.
	dnl
	dnl NOTE: esyscmd() is a GNU M4 extension. Thus, we wrap it in an appropriate
	dnl test. I believe this test will work, but I don't have a place with non-
	dnl GNU M4 to test it right now.
	define([expat_version], ifdef([__gnu__],
	[esyscmd(conftools/get-version.sh lib/expat.h)],
	[2.2.x]))
	AC_INIT(expat, expat_version, expat-bugs@libexpat.org)
	undefine([expat_version])

	AC_CONFIG_SRCDIR(Makefile.in)
	AC_CONFIG_AUX_DIR(conftools)
	AC_CONFIG_MACRO_DIR([m4])


	dnl
	dnl Increment LIBREVISION if source code has changed at all
	dnl
	dnl If the API has changed, increment LIBCURRENT and set LIBREVISION to 0
	dnl
	dnl If the API changes compatibly (i.e. simply adding a new function
	dnl without changing or removing earlier interfaces), then increment LIBAGE.
	dnl
	dnl If the API changes incompatibly set LIBAGE back to 0
	dnl

	LIBCURRENT=7 # sync
	LIBREVISION=5 # with
	LIBAGE=6 # CMakeLists.txt!

	AC_CONFIG_HEADER(expat_config.h)

	sinclude(conftools/ac_c_bigendian_cross.m4)

	AC_LIBTOOL_WIN32_DLL
	AC_PROG_LIBTOOL

	AC_SUBST(LIBCURRENT)
	AC_SUBST(LIBREVISION)
	AC_SUBST(LIBAGE)

	dnl Checks for programs.
	AC_PROG_CC_C99
	AC_PROG_CXX
	AC_PROG_INSTALL

	if test "$GCC" = yes ; then
	dnl
	dnl Be careful about adding the -fexceptions option; some versions of
	dnl GCC don't support it and it causes extra warnings that are only
	dnl distracting; avoid.
	dnl
	OLDCFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wstrict-prototypes"
	CFLAGS="$OLDCFLAGS -fexceptions"
	AC_MSG_CHECKING(whether $CC accepts -fexceptions)
	AC_TRY_LINK( , ,
	AC_MSG_RESULT(yes),
	AC_MSG_RESULT(no); CFLAGS="$OLDCFLAGS")
	if test "x$CXXFLAGS" = x ; then
	CXXFLAGS=`echo "$CFLAGS" \| sed 's/ -Wmissing-prototypes -Wstrict-prototypes//'`
	fi

	CFLAGS="${CFLAGS} -fno-strict-aliasing"
	CXXFLAGS="${CXXFLAGS} -fno-strict-aliasing"
	LDFLAGS="${LDFLAGS} -fno-strict-aliasing"
	fi

	dnl Checks for header files.
	AC_HEADER_STDC

	dnl Checks for typedefs, structures, and compiler characteristics.

	dnl Note: Avoid using AC_C_BIGENDIAN because it does not
	dnl work in a cross compile.
	AC_C_BIGENDIAN_CROSS

	AC_C_CONST
	AC_TYPE_SIZE_T
	AC_CHECK_FUNCS(memmove bcopy)


	AC_ARG_WITH([libbsd], [
	AS_HELP_STRING([--with-libbsd], [utilize libbsd (for arc4random_buf)])
	], [], [with_libbsd=no])
	AS_IF([test "x${with_libbsd}" != xno], [
	AC_CHECK_LIB([bsd], [arc4random_buf], [], [
	AS_IF([test "x${with_libbsd}" = xyes], [
	AC_MSG_ERROR([Enforced use of libbsd cannot be satisfied.])
	])
	])
	])
	AC_MSG_CHECKING([for arc4random_buf (BSD or libbsd)])
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	#include <stdlib.h> /* for arc4random_buf on BSD, for NULL */
	#if defined(HAVE_LIBBSD)
	# include <bsd/stdlib.h>
	#endif
	int main() {
	arc4random_buf(NULL, 0U);
	return 0;
	}
	])], [
	AC_DEFINE([HAVE_ARC4RANDOM_BUF], [1],
	[Define to 1 if you have the `arc4random_buf' function.])
	AC_MSG_RESULT([yes])
	], [
	AC_MSG_RESULT([no])

	AC_MSG_CHECKING([for arc4random (BSD, macOS or libbsd)])
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	#if defined(HAVE_LIBBSD)
	# include <bsd/stdlib.h>
	#else
	# include <stdlib.h>
	#endif
	int main() {
	arc4random();
	return 0;
	}
	])], [
	AC_DEFINE([HAVE_ARC4RANDOM], [1],
	[Define to 1 if you have the `arc4random' function.])
	AC_MSG_RESULT([yes])
	], [
	AC_MSG_RESULT([no])
	])
	])


	AC_MSG_CHECKING([for getrandom (Linux 3.17+, glibc 2.25+)])
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	#include <stdlib.h> /* for NULL */
	#include <sys/random.h>
	int main() {
	return getrandom(NULL, 0U, 0U);
	}
	])], [
	AC_DEFINE([HAVE_GETRANDOM], [1],
	[Define to 1 if you have the `getrandom' function.])
	AC_MSG_RESULT([yes])
	], [
	AC_MSG_RESULT([no])

	AC_MSG_CHECKING([for syscall SYS_getrandom (Linux 3.17+)])
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	#include <stdlib.h> /* for NULL */
	#include <unistd.h> /* for syscall */
	#include <sys/syscall.h> /* for SYS_getrandom */
	int main() {
	syscall(SYS_getrandom, NULL, 0, 0);
	return 0;
	}
	])], [
	AC_DEFINE([HAVE_SYSCALL_GETRANDOM], [1],
	[Define to 1 if you have `syscall' and `SYS_getrandom'.])
	AC_MSG_RESULT([yes])
	], [
	AC_MSG_RESULT([no])
	])
	])


	dnl Only needed for xmlwf:
	AC_CHECK_HEADERS(fcntl.h unistd.h)
	AC_TYPE_OFF_T
	AC_FUNC_MMAP

	if test "$ac_cv_func_mmap_fixed_mapped" = "yes"; then
	FILEMAP=unixfilemap
	else
	FILEMAP=readfilemap
	fi
	AC_SUBST(FILEMAP)


	dnl Some basic configuration:
	AC_DEFINE([XML_NS], 1,
	[Define to make XML Namespaces functionality available.])
	AC_DEFINE([XML_DTD], 1,
	[Define to make parameter entity parsing functionality available.])
	AC_DEFINE([XML_DEV_URANDOM], 1,
	[Define to include code reading entropy from `/dev/urandom'.])

	AC_ARG_ENABLE([xml-context],
	AS_HELP_STRING([--enable-xml-context @<:@COUNT@:>@],
	[Retain context around the current parse point;
	default is enabled and a size of 1024 bytes])
	AS_HELP_STRING([--disable-xml-context],
	[Do not retain context around the current parse point]),
	[enable_xml_context=${enableval}])
	AS_IF([test "x${enable_xml_context}" != "xno"], [
	AS_IF([test "x${enable_xml_context}" = "xyes" \
	-o "x${enable_xml_context}" = "x"], [
	enable_xml_context=1024
	])
	AC_DEFINE_UNQUOTED([XML_CONTEXT_BYTES], [${enable_xml_context}],
	[Define to specify how much context to retain around the current parse point.])
	])

	AC_CONFIG_FILES([Makefile expat.pc])
	AC_CONFIG_FILES([run.sh], [chmod +x run.sh])
	AC_OUTPUT

	abs_srcdir="`cd $srcdir && pwd`"
	abs_builddir="`pwd`"
	if test "$abs_srcdir" != "$abs_builddir"; then
	make mkdir-init
	fi