m4_define([jq_version], m4_esyscmd_s([git describe --tags --dirty --match 'jq-*'|sed 's/^jq-//']))

AC_INIT([jq], [jq_version], [mu@netsoc.tcd.ie],
             [jq], [http://stedolan.github.com/jq/])

dnl Created autoconf implementation thompson@dtosolutions, 26NOV12
AC_PREREQ([2.61])
AC_CONFIG_AUX_DIR([config])
AM_INIT_AUTOMAKE([parallel-tests foreign -Wall])
AM_SILENT_RULES([yes])
AM_PROG_AR
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
AC_MSG_CHECKING([bison version])
if test "$YACC" != "bison -y"; then
  AC_MSG_RESULT([not bison])
elif $YACC --help | grep -- --warnings >/dev/null; then 
  AC_MSG_RESULT([ok])
else 
  AC_MSG_RESULT([no])
  AC_MSG_ERROR([You need bison version 2.5 or more recent.])
fi

dnl
dnl these program checks should probably be deleted
dnl

AC_PROG_LEX
if test "x$LEX" != xflex; then
  LEX="$SHELL $missing_dir/missing flex"
fi


##########################################################################
# check for ONIGURUMA library
##########################################################################

AC_ARG_WITH([oniguruma],
    [AS_HELP_STRING([--with-oniguruma=prefix],
        [try this for a non-standard install prefix of the oniguruma library])],
    [ONIGURUMAPATHSET=1],
    [ONIGURUMAPATHSET=0])

if test $ONIGURUMAPATHSET == 1; then
  CFLAGS="$CFLAGS -I${with_oniguruma}/include"
  LDFLAGS="$LDFLAGS -L${with_oniguruma}/lib"
fi

# store current *FLAGS and merge with AM_*FLAGS for compilation and linker check   
OLD_CFLAGS=$CFLAGS;
OLD_LDFLAGS=$LDFLAGS;
CFLAGS="$AM_CFLAGS $CFLAGS"
LDFLAGS="$AM_LDFLAGS $LDFLAGS"

# ensure the library to check for is covered by the LIBS variable
OLD_LIBS=$LIBS
LIBS="$LIBS -lonig"

# check for ONIGURUMA library headers   
AC_MSG_CHECKING([for oniguruma.h])
# try to compile a file that includes a header of the library oniguruma
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include <oniguruma.h> ])],
    [AC_MSG_RESULT([yes])
        # try to link the function 'onig_free' out of library oniguruma
        AC_MSG_CHECKING([for oniguruma usability])
        AC_LINK_IFELSE(
            [AC_LANG_PROGRAM([[#include <oniguruma.h>]],
                [[onig_free(0);]])],
            [AC_MSG_RESULT([yes])
                FOUND_ONIGURUMA=1;],
            [AC_MSG_RESULT([no])
                LIBS=$OLD_LIBS; dnl reset to old value since oniguruma was not found
                FOUND_ONIGURUMA=0;])],
    [AC_MSG_RESULT([not found])
        FOUND_ONIGURUMA=0;])

# reset original *FLAGS
CFLAGS=$OLD_CFLAGS
LDFLAGS=$OLD_LDFLAGS

# handle check results
if test $FOUND_ONIGURUMA != 1; then
    AC_MSG_NOTICE([Oniguruma was not found.])
    AC_MSG_NOTICE([ Try setting the location using '--with-oniguruma=PREFIX' ])
    AC_MSG_ERROR([ oniguruma is required to build jq.])
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


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]))

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 won't 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_DOCS], [test "x$enable_docs" != xno])

AC_FIND_FUNC([isatty], [c], [#include <unistd.h>], [0])
AC_FIND_FUNC([_isatty], [c], [#include <io.h>], [0])

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 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)
)

AC_SUBST([BUNDLER], ["$bundle_cmd"])

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