configure.ac - third_party/github.com/jqlang/jq - Git at Google

 m4_define([jq_version],
           m4_esyscmd_s([(git rev-parse --verify -q jq-1.0 > /dev/null &&
                         (git describe --tags --dirty --match 'jq-*'|sed 's/^jq-//')) ||
                         echo `git rev-parse --abbrev-ref HEAD`-`git describe --always --dirty`])))

 AC_INIT([jq], [jq_version], [https://github.com/stedolan/jq/issues],
              [jq], [https://stedolan.github.io/jq])

 m4_include([m4/ax_compare_version.m4])
 m4_include([m4/ax_prog_bison_version.m4])

 dnl Created autoconf implementation thompson@dtosolutions, 26NOV12
 AC_PREREQ([2.64])
 AC_CONFIG_AUX_DIR([config])
 AM_INIT_AUTOMAKE([1.11.2 subdir-objects parallel-tests foreign -Wall])
 AM_SILENT_RULES([yes])
 AM_PROG_AR
 AM_MAINTAINER_MODE([enable])
 AC_PROG_CC
 AC_PROG_CC_STDC
 AC_PROG_CPP_WERROR
 AC_PROG_YACC
 AC_OBJEXT
 AC_EXEEXT
 LT_INIT([shared static win32-dll])
 AM_PROG_CC_C_O


 dnl couldn't use AM_PROG_LEX as it doesn't support header files like the
 dnl AC_PROG_YACC macros...

 dnl check bison version

 if test "$USE_MAINTAINER_MODE" = yes; then
   if test "$YACC" != "bison -y"; then
     AC_MSG_CHECKING([bison version])
     AC_MSG_RESULT([not bison])
   else
     AX_PROG_BISON_VERSION([3],
       [],
       [AC_MSG_ERROR([You need bison version 3.0 or greater, or use --disable-maintainer-mode.])])
   fi

   AC_CHECK_PROGS(LEX, flex lex)
 fi

 dnl Check for valgrind
 AC_CHECK_PROGS(valgrind_cmd, valgrind)
 if test "x$valgrind_cmd" = "x" ; then
     AC_MSG_WARN([valgrind is required to test jq.])
 fi
 AC_CHECK_FUNCS(memmem)
 AC_CHECK_FUNCS(mkstemp)

 AC_CHECK_HEADER("shlwapi.h",[have_win32=1;])
 AM_CONDITIONAL([WIN32], [test "x$have_win32" = x1])

 dnl Running tests with Valgrind is slow. It is faster to iterate on
 dnl code without Valgrind until tests pass, then enable Valgrind and
 dnl fix leaks.
 AC_ARG_ENABLE([valgrind],
    AC_HELP_STRING([--disable-valgrind], [do not run tests under Valgrind]))

 dnl Running tests with Valgrind is slow; address sanitizer (ASAN) is
 dnl faster.
 AC_ARG_ENABLE([asan],
    AC_HELP_STRING([--enable-asan], [enable address sanitizer]))

 dnl Undefined Behavior Sanitizer
 AC_ARG_ENABLE([ubsan],
    AC_HELP_STRING([--enable-ubsan], [enable undefined behavior sanitizer]))

 dnl Code coverage
 AC_ARG_ENABLE([gcov],
    AC_HELP_STRING([--enable-gcov], [enable gcov code coverage tool]))

 dnl Don't attempt to build docs if there's no Ruby lying around
 AC_ARG_ENABLE([docs],
    AC_HELP_STRING([--disable-docs], [don't build docs]))

 dnl Don't attempt to build the error injection object (if there is no LD_PRELOAD support)
 AC_ARG_ENABLE([error-injection],
    AC_HELP_STRING([--enable-error-injection], [build and test with error injection]))

 dnl Enable building all static
 AC_ARG_ENABLE([all-static],
    AC_HELP_STRING([--enable-all-static], [link jq with static libraries only]))

 AS_IF([test "x$enable_docs" != "xno"],[
    AC_CHECK_PROGS(bundle_cmd, bundle)

    AC_CACHE_CHECK([for Ruby dependencies], [jq_cv_ruby_deps],
      [jq_cv_ruby_deps=yes;
         AS_IF([test "x$bundle_cmd" = "x" || \
         ! bmsg="`cd ${srcdir}/docs; "$bundle_cmd" check 2>/dev/null`"],[
            AC_MSG_WARN([$bmsg])
            cat <<EOF
 *****************************************************************
 *  Ruby dependencies for building jq documentation not found.   *
 *  You can still build, install and hack on jq, but the manpage *
 *  will not be rebuilt and some of the tests will not run.      *
 *  See docs/README.md for how to install the docs dependencies. *
 *****************************************************************
 EOF
            jq_cv_ruby_deps=no
      ])])

    if test "x$jq_cv_ruby_deps" != "xyes"; then
      enable_docs=no
    fi
 ])

 AM_CONDITIONAL([ENABLE_VALGRIND], [test "x$enable_valgrind" != xno])
 AM_CONDITIONAL([ENABLE_ASAN], [test "x$enable_asan" = xyes])
 AM_CONDITIONAL([ENABLE_UBSAN], [test "x$enable_ubsan" = xyes])
 AM_CONDITIONAL([ENABLE_GCOV], [test "x$enable_gcov" = xyes])
 AM_CONDITIONAL([ENABLE_DOCS], [test "x$enable_docs" != xno])
 AM_CONDITIONAL([ENABLE_ERROR_INJECTION], [test "x$enable_error_injection" = xyes])
 AM_CONDITIONAL([ENABLE_ALL_STATIC], [test "x$enable_all_static" = xyes])

 AC_FUNC_ALLOCA

 AC_FIND_FUNC([isatty], [c], [#include <unistd.h>], [0])
 AC_FIND_FUNC([_isatty], [c], [#include <io.h>], [0])
 AC_FIND_FUNC([strptime], [c], [#include <time.h>], [0, 0, 0])
 AC_FIND_FUNC([strftime], [c], [#include <time.h>], [0, 0, 0, 0])
 AC_FIND_FUNC([timegm], [c], [#include <time.h>], [0])
 AC_FIND_FUNC([gmtime_r], [c], [#include <time.h>], [0, 0])
 AC_FIND_FUNC([gmtime], [c], [#include <time.h>], [0])
 AC_FIND_FUNC([localtime_r], [c], [#include <time.h>], [0, 0])
 AC_FIND_FUNC([localtime], [c], [#include <time.h>], [0])
 AC_FIND_FUNC([gettimeofday], [c], [#include <time.h>], [0, 0])
 AC_CHECK_MEMBER([struct tm.tm_gmtoff], [AC_DEFINE([HAVE_TM_TM_GMT_OFF],1,[Define to 1 if the system has the tm_gmt_off field in struct tm])],
                 [], [[#include <time.h>]])
 AC_CHECK_MEMBER([struct tm.__tm_gmtoff], [AC_DEFINE([HAVE_TM___TM_GMT_OFF],1,[Define to 1 if the system has the __tm_gmt_off field in struct tm])],
                 [], [[#include <time.h>]])

 AC_ARG_ENABLE([pthread-tls],
               [AC_HELP_STRING([--enable-pthread-tls],
                               [Enable use of pthread thread local storage])],
               [],
               [enable_pthread_tls=no])

 if test $enable_pthread_tls = yes; then
     AC_FIND_FUNC([pthread_key_create], [pthread], [#include <pthread.h>], [NULL, NULL])
     AC_FIND_FUNC([pthread_once], [pthread], [#include <pthread.h>], [NULL, NULL])
     AC_FIND_FUNC([atexit], [pthread], [#include <stdlib.h>], [NULL])
 fi

 dnl libm math.h functions
 AC_CHECK_MATH_FUNC(acos)
 AC_CHECK_MATH_FUNC(acosh)
 AC_CHECK_MATH_FUNC(asin)
 AC_CHECK_MATH_FUNC(asinh)
 AC_CHECK_MATH_FUNC(atan2)
 AC_CHECK_MATH_FUNC(atan)
 AC_CHECK_MATH_FUNC(atanh)
 AC_CHECK_MATH_FUNC(cbrt)
 AC_CHECK_MATH_FUNC(ceil)
 AC_CHECK_MATH_FUNC(copysign)
 AC_CHECK_MATH_FUNC(cos)
 AC_CHECK_MATH_FUNC(cosh)
 AC_CHECK_MATH_FUNC(drem)
 AC_CHECK_MATH_FUNC(erf)
 AC_CHECK_MATH_FUNC(erfc)
 AC_CHECK_MATH_FUNC(exp10)
 AC_CHECK_MATH_FUNC(exp2)
 AC_CHECK_MATH_FUNC(exp)
 AC_CHECK_MATH_FUNC(expm1)
 AC_CHECK_MATH_FUNC(fabs)
 AC_CHECK_MATH_FUNC(fdim)
 AC_CHECK_MATH_FUNC(floor)
 AC_CHECK_MATH_FUNC(fma)
 AC_CHECK_MATH_FUNC(fmax)
 AC_CHECK_MATH_FUNC(fmin)
 AC_CHECK_MATH_FUNC(fmod)
 AC_CHECK_MATH_FUNC(frexp)
 AC_CHECK_MATH_FUNC(gamma)
 AC_CHECK_MATH_FUNC(hypot)
 AC_CHECK_MATH_FUNC(j0)
 AC_CHECK_MATH_FUNC(j1)
 AC_CHECK_MATH_FUNC(jn)
 AC_CHECK_MATH_FUNC(ldexp)
 AC_CHECK_MATH_FUNC(lgamma)
 AC_CHECK_MATH_FUNC(log10)
 AC_CHECK_MATH_FUNC(log1p)
 AC_CHECK_MATH_FUNC(log2)
 AC_CHECK_MATH_FUNC(log)
 AC_CHECK_MATH_FUNC(logb)
 AC_CHECK_MATH_FUNC(modf)
 AC_CHECK_MATH_FUNC(lgamma_r)
 AC_CHECK_MATH_FUNC(nearbyint)
 AC_CHECK_MATH_FUNC(nextafter)
 AC_CHECK_MATH_FUNC(nexttoward)
 AC_CHECK_MATH_FUNC(pow10) # Not available with glibc version >= 2.27
 AC_CHECK_MATH_FUNC(pow)
 AC_CHECK_MATH_FUNC(remainder)
 AC_CHECK_MATH_FUNC(rint)
 AC_CHECK_MATH_FUNC(round)
 AC_CHECK_MATH_FUNC(scalb)
 AC_CHECK_MATH_FUNC(scalbln)
 AC_CHECK_MATH_FUNC(significand)
 AC_CHECK_MATH_FUNC(sin)
 AC_CHECK_MATH_FUNC(sinh)
 AC_CHECK_MATH_FUNC(sqrt)
 AC_CHECK_MATH_FUNC(tan)
 AC_CHECK_MATH_FUNC(tanh)
 AC_CHECK_MATH_FUNC(tgamma)
 AC_CHECK_MATH_FUNC(trunc)
 AC_CHECK_MATH_FUNC(y0)
 AC_CHECK_MATH_FUNC(y1)
 AC_CHECK_MATH_FUNC(yn)

 dnl Thread local storage
 have___thread=no
 AC_MSG_CHECKING(for thread-local storage)
 AC_LINK_IFELSE([AC_LANG_SOURCE([
 static __thread int x ;
 int main () { x = 123; return x; }
 ])], have___thread=yes)
 if test $have___thread = yes; then
    AC_DEFINE([HAVE___THREAD],1,[Define to 1 if the system supports __thread])
 fi
 AC_MSG_RESULT($have___thread)

 AC_C_BIGENDIAN(
    AC_DEFINE([IEEE_MC68k], 1, [machine is bigendian]),
    AC_DEFINE([IEEE_8087], 1, [machine is littleendian]),
    AC_MSG_ERROR(unknown endianess),
    AC_MSG_ERROR(universial endianess not supported)
 )

 dnl Oniguruma
 AC_ARG_WITH([oniguruma],
    [AS_HELP_STRING([--with-oniguruma=prefix],
       [try this for a non-standard install prefix of the oniguruma library])], ,
    [with_oniguruma=yes])

 onig_CFLAGS=
 onig_LDFLAGS=
 build_oniguruma=no
 AS_IF([test "x$with_oniguruma" != xno], [
    save_CFLAGS="$CFLAGS"
    save_LDFLAGS="$LDFLAGS"
    AS_IF([test "x$with_oniguruma" != xyes], [
       AS_IF([test "x$with_oniguruma" = xbuiltin], [
           build_oniguruma=yes
       ], [
           onig_CFLAGS="-I${with_oniguruma}/include"
           onig_LDFLAGS="-L${with_oniguruma}/lib"
       ])
    ])
    AS_IF([test "x$build_oniguruma" = xno], [
        # check for ONIGURUMA library, either in /usr or where requested
        CFLAGS="$CFLAGS $onig_CFLAGS"
        LDFLAGS="$LDFLAGS $onig_LDFLAGS"
        AC_CHECK_HEADER("oniguruma.h",
           AC_CHECK_LIB([onig],[onig_version]))
        # handle check results
        AS_IF([test "x$ac_cv_lib_onig_onig_version" != "xyes"], [
           build_oniguruma=yes
           AC_MSG_NOTICE([Oniguruma was not found. Will use the packaged oniguruma.])
        ])
    ])
    AS_IF([test "x$build_oniguruma" = xyes -a -f "${srcdir}/modules/oniguruma/configure.ac" ], [
        onig_CFLAGS="-I${srcdir}/modules/oniguruma/src"
        onig_LDFLAGS="-L${srcdir}/modules/oniguruma/src -Wl,-rpath,${libdir}"
        AC_CONFIG_SUBDIRS([modules/oniguruma])
        AC_DEFINE([HAVE_LIBONIG],1,[Define to 1 if the system includes libonig])
    ])
    CFLAGS="$save_CFLAGS"
    LDFLAGS="$save_LDFLAGS"
 ])
 AC_SUBST(onig_CFLAGS)
 AC_SUBST(onig_LDFLAGS)

 AM_CONDITIONAL([BUILD_ONIGURUMA], [test "x$build_oniguruma" = xyes])
 AC_SUBST([BUNDLER], ["$bundle_cmd"])

 AC_CONFIG_MACRO_DIR([config/m4])
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
	m4_define([jq_version],
	m4_esyscmd_s([(git rev-parse --verify -q jq-1.0 > /dev/null &&
	(git describe --tags --dirty --match 'jq-*'\|sed 's/^jq-//')) \|\|
	echo `git rev-parse --abbrev-ref HEAD`-`git describe --always --dirty`])))

	AC_INIT([jq], [jq_version], [https://github.com/stedolan/jq/issues],
	[jq], [https://stedolan.github.io/jq])

	m4_include([m4/ax_compare_version.m4])
	m4_include([m4/ax_prog_bison_version.m4])

	dnl Created autoconf implementation thompson@dtosolutions, 26NOV12
	AC_PREREQ([2.64])
	AC_CONFIG_AUX_DIR([config])
	AM_INIT_AUTOMAKE([1.11.2 subdir-objects parallel-tests foreign -Wall])
	AM_SILENT_RULES([yes])
	AM_PROG_AR
	AM_MAINTAINER_MODE([enable])
	AC_PROG_CC
	AC_PROG_CC_STDC
	AC_PROG_CPP_WERROR
	AC_PROG_YACC
	AC_OBJEXT
	AC_EXEEXT
	LT_INIT([shared static win32-dll])
	AM_PROG_CC_C_O


	dnl couldn't use AM_PROG_LEX as it doesn't support header files like the
	dnl AC_PROG_YACC macros...

	dnl check bison version

	if test "$USE_MAINTAINER_MODE" = yes; then
	if test "$YACC" != "bison -y"; then
	AC_MSG_CHECKING([bison version])
	AC_MSG_RESULT([not bison])
	else
	AX_PROG_BISON_VERSION([3],
	[],
	[AC_MSG_ERROR([You need bison version 3.0 or greater, or use --disable-maintainer-mode.])])
	fi

	AC_CHECK_PROGS(LEX, flex lex)
	fi

	dnl Check for valgrind
	AC_CHECK_PROGS(valgrind_cmd, valgrind)
	if test "x$valgrind_cmd" = "x" ; then
	AC_MSG_WARN([valgrind is required to test jq.])
	fi
	AC_CHECK_FUNCS(memmem)
	AC_CHECK_FUNCS(mkstemp)

	AC_CHECK_HEADER("shlwapi.h",[have_win32=1;])
	AM_CONDITIONAL([WIN32], [test "x$have_win32" = x1])

	dnl Running tests with Valgrind is slow. It is faster to iterate on
	dnl code without Valgrind until tests pass, then enable Valgrind and
	dnl fix leaks.
	AC_ARG_ENABLE([valgrind],
	AC_HELP_STRING([--disable-valgrind], [do not run tests under Valgrind]))

	dnl Running tests with Valgrind is slow; address sanitizer (ASAN) is
	dnl faster.
	AC_ARG_ENABLE([asan],
	AC_HELP_STRING([--enable-asan], [enable address sanitizer]))

	dnl Undefined Behavior Sanitizer
	AC_ARG_ENABLE([ubsan],
	AC_HELP_STRING([--enable-ubsan], [enable undefined behavior sanitizer]))

	dnl Code coverage
	AC_ARG_ENABLE([gcov],
	AC_HELP_STRING([--enable-gcov], [enable gcov code coverage tool]))

	dnl Don't attempt to build docs if there's no Ruby lying around
	AC_ARG_ENABLE([docs],
	AC_HELP_STRING([--disable-docs], [don't build docs]))

	dnl Don't attempt to build the error injection object (if there is no LD_PRELOAD support)
	AC_ARG_ENABLE([error-injection],
	AC_HELP_STRING([--enable-error-injection], [build and test with error injection]))

	dnl Enable building all static
	AC_ARG_ENABLE([all-static],
	AC_HELP_STRING([--enable-all-static], [link jq with static libraries only]))

	AS_IF([test "x$enable_docs" != "xno"],[
	AC_CHECK_PROGS(bundle_cmd, bundle)

	AC_CACHE_CHECK([for Ruby dependencies], [jq_cv_ruby_deps],
	[jq_cv_ruby_deps=yes;
	AS_IF([test "x$bundle_cmd" = "x" \|\| \
	! bmsg="`cd ${srcdir}/docs; "$bundle_cmd" check 2>/dev/null`"],[
	AC_MSG_WARN([$bmsg])
	cat <<EOF
	*****************************************************************
	* Ruby dependencies for building jq documentation not found. *
	* You can still build, install and hack on jq, but the manpage *
	* will not be rebuilt and some of the tests will not run. *
	* See docs/README.md for how to install the docs dependencies. *
	*****************************************************************
	EOF
	jq_cv_ruby_deps=no
	])])

	if test "x$jq_cv_ruby_deps" != "xyes"; then
	enable_docs=no
	fi
	])

	AM_CONDITIONAL([ENABLE_VALGRIND], [test "x$enable_valgrind" != xno])
	AM_CONDITIONAL([ENABLE_ASAN], [test "x$enable_asan" = xyes])
	AM_CONDITIONAL([ENABLE_UBSAN], [test "x$enable_ubsan" = xyes])
	AM_CONDITIONAL([ENABLE_GCOV], [test "x$enable_gcov" = xyes])
	AM_CONDITIONAL([ENABLE_DOCS], [test "x$enable_docs" != xno])
	AM_CONDITIONAL([ENABLE_ERROR_INJECTION], [test "x$enable_error_injection" = xyes])
	AM_CONDITIONAL([ENABLE_ALL_STATIC], [test "x$enable_all_static" = xyes])

	AC_FUNC_ALLOCA

	AC_FIND_FUNC([isatty], [c], [#include <unistd.h>], [0])
	AC_FIND_FUNC([_isatty], [c], [#include <io.h>], [0])
	AC_FIND_FUNC([strptime], [c], [#include <time.h>], [0, 0, 0])
	AC_FIND_FUNC([strftime], [c], [#include <time.h>], [0, 0, 0, 0])
	AC_FIND_FUNC([timegm], [c], [#include <time.h>], [0])
	AC_FIND_FUNC([gmtime_r], [c], [#include <time.h>], [0, 0])
	AC_FIND_FUNC([gmtime], [c], [#include <time.h>], [0])
	AC_FIND_FUNC([localtime_r], [c], [#include <time.h>], [0, 0])
	AC_FIND_FUNC([localtime], [c], [#include <time.h>], [0])
	AC_FIND_FUNC([gettimeofday], [c], [#include <time.h>], [0, 0])
	AC_CHECK_MEMBER([struct tm.tm_gmtoff], [AC_DEFINE([HAVE_TM_TM_GMT_OFF],1,[Define to 1 if the system has the tm_gmt_off field in struct tm])],
	[], [[#include <time.h>]])
	AC_CHECK_MEMBER([struct tm.__tm_gmtoff], [AC_DEFINE([HAVE_TM___TM_GMT_OFF],1,[Define to 1 if the system has the __tm_gmt_off field in struct tm])],
	[], [[#include <time.h>]])

	AC_ARG_ENABLE([pthread-tls],
	[AC_HELP_STRING([--enable-pthread-tls],
	[Enable use of pthread thread local storage])],
	[],
	[enable_pthread_tls=no])

	if test $enable_pthread_tls = yes; then
	AC_FIND_FUNC([pthread_key_create], [pthread], [#include <pthread.h>], [NULL, NULL])
	AC_FIND_FUNC([pthread_once], [pthread], [#include <pthread.h>], [NULL, NULL])
	AC_FIND_FUNC([atexit], [pthread], [#include <stdlib.h>], [NULL])
	fi

	dnl libm math.h functions
	AC_CHECK_MATH_FUNC(acos)
	AC_CHECK_MATH_FUNC(acosh)
	AC_CHECK_MATH_FUNC(asin)
	AC_CHECK_MATH_FUNC(asinh)
	AC_CHECK_MATH_FUNC(atan2)
	AC_CHECK_MATH_FUNC(atan)
	AC_CHECK_MATH_FUNC(atanh)
	AC_CHECK_MATH_FUNC(cbrt)
	AC_CHECK_MATH_FUNC(ceil)
	AC_CHECK_MATH_FUNC(copysign)
	AC_CHECK_MATH_FUNC(cos)
	AC_CHECK_MATH_FUNC(cosh)
	AC_CHECK_MATH_FUNC(drem)
	AC_CHECK_MATH_FUNC(erf)
	AC_CHECK_MATH_FUNC(erfc)
	AC_CHECK_MATH_FUNC(exp10)
	AC_CHECK_MATH_FUNC(exp2)
	AC_CHECK_MATH_FUNC(exp)
	AC_CHECK_MATH_FUNC(expm1)
	AC_CHECK_MATH_FUNC(fabs)
	AC_CHECK_MATH_FUNC(fdim)
	AC_CHECK_MATH_FUNC(floor)
	AC_CHECK_MATH_FUNC(fma)
	AC_CHECK_MATH_FUNC(fmax)
	AC_CHECK_MATH_FUNC(fmin)
	AC_CHECK_MATH_FUNC(fmod)
	AC_CHECK_MATH_FUNC(frexp)
	AC_CHECK_MATH_FUNC(gamma)
	AC_CHECK_MATH_FUNC(hypot)
	AC_CHECK_MATH_FUNC(j0)
	AC_CHECK_MATH_FUNC(j1)
	AC_CHECK_MATH_FUNC(jn)
	AC_CHECK_MATH_FUNC(ldexp)
	AC_CHECK_MATH_FUNC(lgamma)
	AC_CHECK_MATH_FUNC(log10)
	AC_CHECK_MATH_FUNC(log1p)
	AC_CHECK_MATH_FUNC(log2)
	AC_CHECK_MATH_FUNC(log)
	AC_CHECK_MATH_FUNC(logb)
	AC_CHECK_MATH_FUNC(modf)
	AC_CHECK_MATH_FUNC(lgamma_r)
	AC_CHECK_MATH_FUNC(nearbyint)
	AC_CHECK_MATH_FUNC(nextafter)
	AC_CHECK_MATH_FUNC(nexttoward)
	AC_CHECK_MATH_FUNC(pow10) # Not available with glibc version >= 2.27
	AC_CHECK_MATH_FUNC(pow)
	AC_CHECK_MATH_FUNC(remainder)
	AC_CHECK_MATH_FUNC(rint)
	AC_CHECK_MATH_FUNC(round)
	AC_CHECK_MATH_FUNC(scalb)
	AC_CHECK_MATH_FUNC(scalbln)
	AC_CHECK_MATH_FUNC(significand)
	AC_CHECK_MATH_FUNC(sin)
	AC_CHECK_MATH_FUNC(sinh)
	AC_CHECK_MATH_FUNC(sqrt)
	AC_CHECK_MATH_FUNC(tan)
	AC_CHECK_MATH_FUNC(tanh)
	AC_CHECK_MATH_FUNC(tgamma)
	AC_CHECK_MATH_FUNC(trunc)
	AC_CHECK_MATH_FUNC(y0)
	AC_CHECK_MATH_FUNC(y1)
	AC_CHECK_MATH_FUNC(yn)

	dnl Thread local storage
	have___thread=no
	AC_MSG_CHECKING(for thread-local storage)
	AC_LINK_IFELSE([AC_LANG_SOURCE([
	static __thread int x ;
	int main () { x = 123; return x; }
	])], have___thread=yes)
	if test $have___thread = yes; then
	AC_DEFINE([HAVE___THREAD],1,[Define to 1 if the system supports __thread])
	fi
	AC_MSG_RESULT($have___thread)

	AC_C_BIGENDIAN(
	AC_DEFINE([IEEE_MC68k], 1, [machine is bigendian]),
	AC_DEFINE([IEEE_8087], 1, [machine is littleendian]),
	AC_MSG_ERROR(unknown endianess),
	AC_MSG_ERROR(universial endianess not supported)
	)

	dnl Oniguruma
	AC_ARG_WITH([oniguruma],
	[AS_HELP_STRING([--with-oniguruma=prefix],
	[try this for a non-standard install prefix of the oniguruma library])], ,
	[with_oniguruma=yes])

	onig_CFLAGS=
	onig_LDFLAGS=
	build_oniguruma=no
	AS_IF([test "x$with_oniguruma" != xno], [
	save_CFLAGS="$CFLAGS"
	save_LDFLAGS="$LDFLAGS"
	AS_IF([test "x$with_oniguruma" != xyes], [
	AS_IF([test "x$with_oniguruma" = xbuiltin], [
	build_oniguruma=yes
	], [
	onig_CFLAGS="-I${with_oniguruma}/include"
	onig_LDFLAGS="-L${with_oniguruma}/lib"
	])
	])
	AS_IF([test "x$build_oniguruma" = xno], [
	# check for ONIGURUMA library, either in /usr or where requested
	CFLAGS="$CFLAGS $onig_CFLAGS"
	LDFLAGS="$LDFLAGS $onig_LDFLAGS"
	AC_CHECK_HEADER("oniguruma.h",
	AC_CHECK_LIB([onig],[onig_version]))
	# handle check results
	AS_IF([test "x$ac_cv_lib_onig_onig_version" != "xyes"], [
	build_oniguruma=yes
	AC_MSG_NOTICE([Oniguruma was not found. Will use the packaged oniguruma.])
	])
	])
	AS_IF([test "x$build_oniguruma" = xyes -a -f "${srcdir}/modules/oniguruma/configure.ac" ], [
	onig_CFLAGS="-I${srcdir}/modules/oniguruma/src"
	onig_LDFLAGS="-L${srcdir}/modules/oniguruma/src -Wl,-rpath,${libdir}"
	AC_CONFIG_SUBDIRS([modules/oniguruma])
	AC_DEFINE([HAVE_LIBONIG],1,[Define to 1 if the system includes libonig])
	])
	CFLAGS="$save_CFLAGS"
	LDFLAGS="$save_LDFLAGS"
	])
	AC_SUBST(onig_CFLAGS)
	AC_SUBST(onig_LDFLAGS)

	AM_CONDITIONAL([BUILD_ONIGURUMA], [test "x$build_oniguruma" = xyes])
	AC_SUBST([BUNDLER], ["$bundle_cmd"])

	AC_CONFIG_MACRO_DIR([config/m4])
	AC_CONFIG_FILES([Makefile])
	AC_OUTPUT