configure.ac

AC_PREREQ(2.57)

dnl Version not hardcoded here. Fetched later from ares_version.h
AC_INIT([c-ares], [-],
  [c-ares mailing list => http://cool.haxx.se/mailman/listinfo/c-ares])

AC_CONFIG_SRCDIR([ares_ipv6.h])
AM_CONFIG_HEADER([config.h])
AM_MAINTAINER_MODE

dnl SED is mandatory for configure process and libtool.
dnl Set it now, allowing it to be changed later.
AC_PATH_PROG([SED], [sed], [not_found],
  [$PATH:/usr/bin:/usr/local/bin])
if test -z "$SED" || test "$SED" = "not_found"; then
  AC_MSG_ERROR([sed not found in PATH. Cannot continue without sed.])
fi
AC_SUBST([SED])

dnl GREP is mandatory for configure process and libtool.
dnl Set it now, allowing it to be changed later.
AC_PATH_PROG([GREP], [grep], [not_found],
  [$PATH:/usr/bin:/usr/local/bin])
if test -z "$GREP" || test "$GREP" = "not_found"; then
  AC_MSG_ERROR([grep not found in PATH. Cannot continue without grep.])
fi
AC_SUBST([GREP])

dnl EGREP is mandatory for configure process and libtool.
dnl Set it now, allowing it to be changed later.
if echo a | ($GREP -E '(a|b)') >/dev/null 2>&1; then
  AC_MSG_CHECKING([for egrep])
  EGREP="$GREP -E"
  AC_MSG_RESULT([$EGREP])
else
  AC_PATH_PROG([EGREP], [egrep], [not_found],
    [$PATH:/usr/bin:/usr/local/bin])
fi
if test -z "$EGREP" || test "$EGREP" = "not_found"; then
  AC_MSG_ERROR([egrep not found in PATH. Cannot continue without egrep.])
fi
AC_SUBST([EGREP])

dnl AR is mandatory for configure process and libtool.
dnl This is target dependant, so check it as a tool.
AC_PATH_TOOL([AR], [ar], [not_found],
  [$PATH:/usr/bin:/usr/local/bin])
if test -z "$AR" || test "$AR" = "not_found"; then
  AC_MSG_ERROR([ar not found in PATH. Cannot continue without ar.])
fi
AC_SUBST([AR])

dnl Fetch c-ares version from ares_version.h
VERSION=`$SED -ne 's/^#define ARES_VERSION_STR "\(.*\)"/\1/p' ${srcdir}/ares_version.h`
AM_INIT_AUTOMAKE([c-ares], [$VERSION])
AC_MSG_CHECKING([c-ares version])
AC_MSG_RESULT([$VERSION])

dnl
dnl Detect the canonical host and target build environment
dnl

AC_CANONICAL_HOST
dnl Get system canonical name
AC_DEFINE_UNQUOTED(OS, "${host}", [cpu-machine-OS])

AC_PROG_CC
AM_PROG_CC_C_O
AC_PROG_INSTALL

dnl This defines _ALL_SOURCE for AIX
CARES_CHECK_AIX_ALL_SOURCE

dnl Our configure and build reentrant settings
CARES_CONFIGURE_REENTRANT

dnl check for how to do large files
AC_SYS_LARGEFILE

case $host_os in
  solaris*)
    AC_DEFINE(ETC_INET, 1, [if a /etc/inet dir is being used])
    ;;
esac

dnl support building of Windows DLLs
AC_LIBTOOL_WIN32_DLL

dnl ************************************************************
dnl Option to switch on debug options. This makes an assumption that
dnl this is built as an 'ares' subdir in the curl source tree. Subject for
dnl improval in the future!
dnl
AC_MSG_CHECKING([whether to enable debug options])
AC_ARG_ENABLE(debug,
AC_HELP_STRING([--enable-debug],[Enable pedantic debug options])
AC_HELP_STRING([--disable-debug],[Disable debug options]),
[ case "$enableval" in
  no)
       AC_MSG_RESULT(no)
       ;;
  *)   AC_MSG_RESULT(yes)

    dnl when doing the debug stuff, use static library only
    AC_DISABLE_SHARED

    debugbuild="yes"

    dnl the entire --enable-debug is a hack that lives and runs on top of
    dnl libcurl stuff so this BUILDING_LIBCURL is not THAT much uglier
    AC_DEFINE(BUILDING_LIBCURL, 1, [when building as static part of libcurl])

    CPPFLAGS="$CPPFLAGS -DCURLDEBUG -I$srcdir/../include"
    CFLAGS="$CFLAGS -g" 

    dnl set compiler "debug" options to become more picky, and remove
    dnl optimize options from CFLAGS
    CURL_CC_DEBUG_OPTS

       ;;
  esac ],
       AC_MSG_RESULT(no)
)
AM_CONDITIONAL(DEBUGBUILD, test x$debugbuild = xyes)
AM_CONDITIONAL(CURLDEBUG, test x$debugbuild = xyes)

dnl skip libtool C++ and Fortran compiler checks
m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
m4_defun([AC_PROG_CXX],[])
m4_ifdef([AC_PROG_CXXCPP], [m4_undefine([AC_PROG_CXXCPP])])
m4_defun([AC_PROG_CXXCPP],[true])
m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
m4_defun([AC_PROG_F77],[])

dnl skip libtool C++ and Fortran linker checks
m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
m4_defun([AC_LIBTOOL_CXX],[])
m4_ifdef([AC_LIBTOOL_CXXCPP], [m4_undefine([AC_LIBTOOL_CXXCPP])])
m4_defun([AC_LIBTOOL_CXXCPP],[true])
m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
m4_defun([AC_LIBTOOL_F77],[])

dnl force libtool to build static libraries with PIC on AMD64-linux
AC_MSG_CHECKING([if arch-OS host is AMD64-linux (to build static libraries with PIC)])
case $host in
  x86_64*linux*)
    AC_MSG_RESULT([yes])
    with_pic=yes
    ;;
  *)
    AC_MSG_RESULT([no])
    ;;
esac

dnl libtool setup
AC_PROG_LIBTOOL

AC_MSG_CHECKING([if we need -no-undefined])
case $host in
  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc*)
    need_no_undefined=yes
    ;;
  *)
    need_no_undefined=no
    ;;
esac
AC_MSG_RESULT($need_no_undefined)
AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)

dnl **********************************************************************
dnl platform/compiler/architecture specific checks/flags
dnl **********************************************************************

ac_cv_compiler="unknown"
ac_cv_compiler_num="unknown"

AC_MSG_CHECKING([whether we are using the IBM C compiler])
CURL_CHECK_DEF([__IBMC__], [], [silent])
if test "$curl_cv_have_def___IBMC__" = "yes"; then
  AC_MSG_RESULT([yes])
  ac_cv_compiler="IBMC"
  dnl Ensure that compiler optimizations are always thread-safe.
  CFLAGS="$CFLAGS -qthreaded"
  dnl Disable type based strict aliasing optimizations, using worst
  dnl case aliasing assumptions when compiling. Type based aliasing
  dnl would restrict the lvalues that could be safely used to access
  dnl a data object.
  CFLAGS="$CFLAGS -qnoansialias"
  dnl Force compiler to stop after the compilation phase, without
  dnl generating an object code file when compilation has errors.
  CFLAGS="$CFLAGS -qhalt=e"
else
  AC_MSG_RESULT([no])
fi

AC_MSG_CHECKING([whether we are using the Intel C compiler])
CURL_CHECK_DEF([__INTEL_COMPILER], [], [silent])
if test "$curl_cv_have_def___INTEL_COMPILER" = "yes"; then
  AC_MSG_RESULT([yes])
  ac_cv_compiler="ICC"