#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
m4_define([MAJOR_VERSION], 2)
m4_define([MINOR_VERSION], 1)
m4_define([MICRO_VERSION], 0)

AC_PREREQ(2.59)
AC_INIT([faux],
        [MAJOR_VERSION.MINOR_VERSION.MICRO_VERSION],
        [serj.kalichev at gmail dot com])

AC_CONFIG_AUX_DIR(aux_scripts)
AC_CONFIG_MACRO_DIR([m4])

# Values for SONAME. See -version-info for details.
AC_SUBST(SONAME_CURRENT, 2)
AC_SUBST(SONAME_REVISION, 0)
AC_SUBST(SONAME_AGE, 0)

# Check for system extensions (_POSIX_THREAD_SEMANTICS for Solaris)
AC_USE_SYSTEM_EXTENSIONS

# Checks for programs.
AC_PROG_CC
AC_LIBTOOL_WIN32_DLL
AC_PROG_LIBTOOL

AC_CONFIG_HEADERS([config.h])
AM_INIT_AUTOMAKE(subdir-objects)
AM_PROG_CC_C_O

# Dir for libc replacements
AC_CONFIG_LIBOBJ_DIR([libc])

# needed to handle 64-bit architecture
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(size_t)

#########################################
# See if linker supports version scripts
#########################################
# Check if LD supports linker scripts,
# and define automake conditional HAVE_LD_VERSION_SCRIPT if so.
AC_ARG_ENABLE([ld-version-script],
              AS_HELP_STRING([--enable-ld-version-script],
                             [enable linker version script (default is enabled when possible)]),
                             [have_ld_version_script=$enableval], [])
if test -z "$have_ld_version_script"; then
    AC_MSG_CHECKING([if LD -Wl,--version-script works])
    save_LDFLAGS="$LDFLAGS"
    LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
    cat > conftest.map <<EOF
VERS_1 {
    global: sym;
};

VERS_2 {
    global: sym;
} VERS_1;
EOF
    AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 0; }])],
                   [have_ld_version_script=yes], [have_ld_version_script=no])
    rm -f conftest.map
    LDFLAGS="$save_LDFLAGS"
    AC_MSG_RESULT($have_ld_version_script)
fi
AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

################################
# Deal with debugging options
################################
AC_ARG_ENABLE(debug,
              [AS_HELP_STRING([--enable-debug],
                              [Turn on debugging including asserts [default=no]])],
              [],
              [enable_debug=no])
AM_CONDITIONAL(DEBUG,test x$enable_debug = xyes)

################################
# Compile in testc tests
################################
AC_ARG_ENABLE(testc,
              [AS_HELP_STRING([--enable-testc],
                              [Enable testc tests compiling [default=no]])],
              [],
              [enable_testc=no])
AM_CONDITIONAL(TESTC,test x$enable_testc = xyes)

################################
# Internal getopt()
################################
AC_ARG_WITH(internal-getopt,
            [AS_HELP_STRING([--with-internal-getopt],
            [Use internal implementation of getopt [default=no]])],
            [],
            [with_internal_getopt=no])

if test x$with_internal_getopt != xno; then
    AC_DEFINE([WITH_INTERNAL_GETOPT], [1], [Use internal getopt() implementation])
    AC_LIBOBJ([getopt])
    AC_MSG_WARN([Use internal implementation of getopt() and getopt_long()])
else
    AC_CHECK_HEADERS(getopt.h, [found_getopt_h=yes],
        AC_MSG_WARN([getopt.h not found: only short parameters can be used on command line]))
fi

AC_MSG_CHECKING([for getopt_long()])
if test x$with_internal_getopt = xyes -o x$found_getopt_h = xyes; then
    AC_DEFINE([HAVE_GETOPT_LONG], [1], [getopt_long() function])
    AC_MSG_RESULT([yes])
else
    AC_MSG_RESULT([no])
fi

################################
# Check for locale.h
################################
AC_CHECK_HEADERS(locale.h, [],
    AC_MSG_WARN([locale.h not found: the locales is not supported]))

################################
# Check for CODESET within nl_langinfo
################################
AC_DEFUN([AM_LANGINFO_CODESET],
[
  AC_CACHE_CHECK([for nl_langinfo and CODESET], [am_cv_langinfo_codeset],
    [AC_TRY_LINK([#include <langinfo.h>],
      [char* cs = nl_langinfo(CODESET); return !cs;],
      [am_cv_langinfo_codeset=yes],
      [am_cv_langinfo_codeset=no])
    ])
  if test $am_cv_langinfo_codeset = yes; then
    AC_DEFINE([HAVE_LANGINFO_CODESET], [1],
      [Define if you have <langinfo.h> and nl_langinfo(CODESET).])
  fi
])
AM_LANGINFO_CODESET

################################
# Check for pwd.h and grp.h
################################
AC_CHECK_HEADERS(pwd.h, [],
    AC_MSG_WARN([pwd.h not found: the pwd operations is not supported]))
AC_CHECK_HEADERS(grp.h, [],
    AC_MSG_WARN([grp.h not found: the grp operations is not supported]))

################################
# Check for dlopen()
################################
AC_CHECK_HEADERS(dlfcn.h, [
        AC_SEARCH_LIBS([dlopen], [dl dld], [], [
          AC_MSG_ERROR([unable to find the dlopen() function])
        ])
    ],[
          AC_MSG_ERROR([dlfcn.h not found: the dl operations is not supported])
    ])

################################
# Check for pthread
################################
# library's net_io.c needs pthread_sigmask()
AX_PTHREAD

################################
# Check for signalfd()
################################
AC_CHECK_FUNCS(signalfd, [],
    AC_MSG_WARN([signalfd() not found: more complex mechanism will be used]))

################################
# Check for ppoll()
################################
AC_CHECK_FUNCS(ppoll, [],
    AC_MSG_WARN([ppoll() not found: more complex mechanism will be used]))


AC_CONFIG_FILES([Makefile])
AC_OUTPUT