#######################################################################################
##
##   The following macros are specific to Gambas.
##   Some of them are made by me (Benoît Minisini)
##   Feel free to use these macros as you need !
##
##   IMPORTANT: This file is shared by all Gambas
##   source packages
##
#######################################################################################

## ---------------------------------------------------------------------------
## GB_MESSAGE
## Prints a message, and stores it in a summay file to print it later
## ---------------------------------------------------------------------------

AC_DEFUN([GB_MESSAGE],
[
  echo "|| $1" >> $srcdir/warnings.log
])

## ---------------------------------------------------------------------------
## GB_MESSAGE
## Prints a warning message, and stores it in a summay file to print it later
## ---------------------------------------------------------------------------

AC_DEFUN([GB_WARNING],
[
  AC_MSG_WARN($1)
  GB_MESSAGE([$1])
])

## ---------------------------------------------------------------------------
## GB_CLEAR_MESSAGES
## Clear summary
## ---------------------------------------------------------------------------

AC_DEFUN([GB_CLEAR_MESSAGES],
[
  rm -f $srcdir/warnings.log
  touch $srcdir/warnings.log
])

## ---------------------------------------------------------------------------
## GB_PRINT_MESSAGES
## Print summary
## ---------------------------------------------------------------------------

AC_DEFUN([GB_PRINT_MESSAGES],
[
  if test -s $srcdir/warnings.log; then
    echo
    echo "||"
    cat $srcdir/warnings.log
    echo "||"
    echo
  fi
  
  rm -f $srcdir/warnings.log.before;
  
  if test -e FAILED && test "x${GAMBAS_CONFIG_FAILURE}" != "x"; then
     AC_MSG_ERROR([Failed to configure $3])
  fi
])

## ---------------------------------------------------------------------------
## GB_INIT_AUTOMAKE
## automake initialization with common version number
## ---------------------------------------------------------------------------

AC_DEFUN([GB_INIT_AUTOMAKE],
[
  AM_INIT_AUTOMAKE([subdir-objects])
  m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES(yes)])
  AC_CONFIG_HEADERS([config.h])
  AC_PREFIX_DEFAULT(/usr)
  MAKEFLAGS=--silent
  AC_SUBST(MAKEFLAGS)

  GAMBAS_VERSION=GB_VERSION_MAJOR
  GAMBAS_MINOR_VERSION=GB_VERSION_MINOR

  AC_SUBST(GAMBAS_VERSION)
  AC_SUBST(GAMBAS_MINOR_VERSION)

  AC_DEFINE(GAMBAS_VERSION, GB_VERSION_MAJOR, Gambas version)
  AC_DEFINE(GAMBAS_MINOR_VERSION, GB_VERSION_MINOR, Gambas minor version)

  AC_DEFINE(GAMBAS_VERSION_STRING, "GB_VERSION_MAJOR", Gambas version string)
  AC_DEFINE(GAMBAS_FULL_VERSION_STRING, "GB_VERSION_MAJOR.GB_VERSION_MINOR", Gambas full version string)

  AC_DEFINE(GAMBAS_FULL_VERSION, GB_VERSION_FULL, [Full Gambas version])
  AC_DEFINE(GAMBAS_PCODE_VERSION, GB_PCODE_VERSION, [Gambas bytecode version])
  AC_DEFINE(GAMBAS_PCODE_VERSION_MIN, GB_PCODE_VERSION_MIN, [Minimum Gambas bytecode version])

  GB_CLEAR_MESSAGES
])

## ---------------------------------------------------------------------------
## GB_TRUNK_VERSION
## detect version and branch (svn and git supported)
## ---------------------------------------------------------------------------

AC_DEFUN([GB_TRUNK_VERSION],
[
  gb_detect_git=`which git 2> /dev/null`
  gb_vcs_hash=""
  gb_vcs_branch=""
  gb_vcs_version=""

  AC_MSG_CHECKING(for vcs revision)

  if test "x${gb_detect_git}" != "x"; then
    gb_vcs_branch=`git rev-parse --abbrev-ref HEAD 2> /dev/null`
    gb_vcs_hash=`git rev-parse --short HEAD 2> /dev/null`
  else
    gb_detect_svn=`which svn 2> /dev/null`
      if test "x${gb_detect_svn}" != "x"; then
        gb_vcs_hash=`svn info --show-item last-changed-revision 2> /dev/null`
      fi
  fi

  if test "x${gb_vcs_branch}" != "x"; then
    gb_vcs_version="${gb_vcs_hash} (${gb_vcs_branch})"
  else
    if test "x${gb_vcs_hash}" != "x"; then
      gb_vcs_version="r${gb_vcs_hash}"
    fi
  fi

  if test "x${gb_vcs_version}" != "x"; then
    AC_DEFINE_UNQUOTED(TRUNK_VERSION, "${gb_vcs_version}", [vcs revision])
    AC_MSG_RESULT([$gb_vcs_version])
  else
    AC_MSG_RESULT(not found)
  fi
])

## ---------------------------------------------------------------------------
## GB_CONFIG_SUBDIRS
## configuration of a component sub-directory, with a flag for disabling it
## ---------------------------------------------------------------------------

AC_DEFUN([GB_CONFIG_SUBDIRS],
[
  AC_ARG_ENABLE(
    $1,
    [  --enable-$1                enable $1 component (default: yes)],
    gb_enable_$1=$enableval,
    gb_enable_$1=yes
  )

  if test "$gb_enable_$1" = "yes"; then
    if test -d $srcdir/$2; then
      AC_CONFIG_SUBDIRS($2)
      $1_dir=$2
    fi
  else
    GB_WARNING([$1 component is disabled by configure option])
    $1_dir=""
  fi

  AC_SUBST($1_dir)
])

## ---------------------------------------------------------------------------
## GB_INIT_SHORT GB_INIT GB_LIBTOOL
## configure.ac initialization
## ---------------------------------------------------------------------------

AC_DEFUN([GB_INIT_SHORT],
[
  AC_CONFIG_SRCDIR([configure.ac])
  AM_MAINTAINER_MODE

  COMPONENT=$1

  GB_INIT_AUTOMAKE

  AC_CANONICAL_HOST

  gbbindir=$bindir/gambas$GAMBAS_VERSION
  AC_SUBST(gbbindir)
  gblibdir=$libdir/gambas$GAMBAS_VERSION
  AC_SUBST(gblibdir)
  gbdatadir=$datadir/gambas$GAMBAS_VERSION
  AC_SUBST(gbdatadir)

  AC_PROG_INSTALL
  AC_PROG_LN_S
])

AC_DEFUN([GB_LIBTOOL],
[
  dnl AC_LIBTOOL_DLOPEN
  dnl AC_LIBTOOL_WIN32_DLL
  AC_DISABLE_STATIC

  AC_SUBST(INCLTDL)
  AC_SUBST(LIBLTDL)

  dnl LD_FLAGS="-Wl,-O1"
  if test $SYSTEM == "CYGWIN"; then
    LD_FLAGS="$LD_FLAGS -no-undefined"
  fi
  AC_SUBST(LD_FLAGS)

  AM_LIBTOOLFLAGS="--silent"
  AC_SUBST(AM_LIBTOOLFLAGS)
])

AC_DEFUN([GB_INIT],
[
  GB_INIT_SHORT($1)
  GB_SYSTEM
  GB_LIBTOOL

  dnl ---- Checks for headers needed by the following tests

  AC_CHECK_HEADERS(unistd.h)
  
  dnl ---- Checks for header files.

  dnl AC_HEADER_DIRENT
  dnl AC_HEADER_SYS_WAIT

  dnl ---- Checks for typedefs, structures, and compiler characteristics.

  dnl AC_C_CONST
  dnl AC_TYPE_PID_T
  dnl AC_TYPE_SIZE_T
  dnl AC_CHECK_HEADERS_ONCE([sys/time.h])

  dnl AC_STRUCT_TM

  AC_TYPE_LONG_DOUBLE_WIDER
  ac_cv_c_long_double=$ac_cv_type_long_double_wider
  if test $ac_cv_c_long_double = yes; then
    AC_DEFINE([HAVE_LONG_DOUBLE],[1],[Define to 1 if the type `long double' works and has more range or
    precision than `double'.])
  fi
  
	AC_CHECK_TYPES([_Bool], [], [], [])

  dnl ---- Checks for library functions.

  dnl AC_FUNC_ALLOCA
  dnl AC_PROG_GCC_TRADITIONAL
  dnl AC_FUNC_STRCOLL
  dnl AC_FUNC_STRFTIME
  dnl AC_FUNC_VPRINTF
  dnl AC_FUNC_WAIT3
  dnl AC_CHECK_FUNCS(getcwd gettimeofday mkdir rmdir select socket strdup strerror strtod strtol sysinfo)

  AC_CHECK_FUNCS(setenv unsetenv getdomainname getpt cfmakeraw fstatat)

  dnl ---- Checks for libraries

  dnl AC_CHECK_LIB(m, main, echo)
  dnl AC_CHECK_LIB(z, main, echo)

  GB_LIBC

  dnl ---- Check for C++ libraries
  
  AC_CHECK_LIB(gcc_s, main, CXX_LIB="$CXX_LIB -lgcc_s")
  AC_CHECK_LIB(stdc++, main, CXX_LIB="$CXX_LIB -lstdc++")

  AC_SUBST(CXX_LIB)

  dnl ---- Check for shared library extension

  GB_SHARED_LIBRARY_EXT()

  dnl ---- Check for threading

  GB_THREAD()

  dnl ---- Check for mathematic libraries

  GB_MATH()

  dnl ---- Check for gettext library

  GB_GETTEXT()
  
  dnl ---- Check for inotify library

  GB_INOTIFY()

  dnl ---- Check for internationalization library

  GB_INTL()

  dnl ---- Check for charset conversion library

  GB_ICONV()

  dnl ---- Check for monotonic clock
  
  GB_MONOTONIC()
  
  dnl ---- Support for colorgcc
  dnl ---- WARNING: libtool does not support colorgcc!

  dnl AC_PATH_PROG(COLORGCC, colorgcc)

  if test x"$COLORGCC" != x; then
    if test "$gambas_colorgcc" = "yes"; then
      CC="colorgcc"
      CXX="g++"
    fi
  fi

  dnl ---- Support for ccache

  AC_ARG_ENABLE(
    ccache,
    [  --enable-ccache                use ccache if present (default: yes)],
    gambas_ccache=$enableval,
    gambas_ccache=yes
  )

  AC_PATH_PROG(CCACHE, ccache)

  if test "$gambas_colorgcc" = "yes"; then
    if test x"$CCACHE" != x; then

      CC="ccache $CC"
      CXX="ccache $CXX"

      if test x"$COLORGCC" != x; then
        if test "$gambas_colorgcc" = "yes"; then
          CC="colorgcc"
          CXX="colorgcc"
        fi
      fi

    fi
  fi

  dnl ---- debug option

  AC_ARG_ENABLE(
    debug,
    [  --enable-debug                 compile for debugging (default: yes)],
    gambas_debug=$enableval,
    gambas_debug=yes
  )

  AM_CONDITIONAL(DEBUG, test "$gambas_debug" = yes)

  dnl ---- optimization option

  AC_ARG_ENABLE(
    optimization,
    [  --enable-optimization          compile with optimizations (default: yes)],
    gambas_optimization=$enableval,
    gambas_optimization=yes
  )

  AM_CONDITIONAL(OPTIMIZE, test "$gambas_optimization" = yes)

  AM_CFLAGS="$AM_CFLAGS -pipe -Wall -Wno-unused-value -fsigned-char"
  if test $SYSTEM = "MACOSX"; then
    AM_CFLAGS="$AM_CFLAGS -fnested-functions"
  fi

  AM_CXXFLAGS="$AM_CXXFLAGS -pipe -Wall -fno-exceptions -Wno-unused-value -fsigned-char"

  dnl ---- Check for gcc -std=gnu17 option

  GB_CFLAGS_GCC_OPTION([-std=gnu17],,[AM_CFLAGS="$AM_CFLAGS -std=gnu17"])

  dnl ---- Check for gcc visibility flag

  have_gcc_visibility=no

  if test $SYSTEM != "CYGWIN"; then
    GB_CFLAGS_GCC_OPTION([-fvisibility=hidden],,
      [
      AM_CFLAGS="$AM_CFLAGS -fvisibility=hidden"
      AM_CXXFLAGS="$AM_CXXFLAGS -fvisibility=hidden"
      have_gcc_visibility=yes])
  fi

  if test "$have_gcc_visibility" = "yes"; then
    AC_DEFINE(HAVE_GCC_VISIBILITY, 1, [Whether gcc supports -fvisibility=hidden])
  fi

  dnl ---- check for -fcf-protection=return compiler flag

  have_gcc_nocte=no

  GB_CFLAGS_GCC_OPTION([-fcf-protection=return],,
    [
      GB_CFLAGS_NOCTE=" -fcf-protection=return"
      have_gcc_nocte=yes
    ])

  dnl ---- check for -flto compiler flag
  
  GB_CFLAGS_GCC_OPTION([-flto],,
    [
      GB_CFLAGS_LTO=" -flto"
      have_gcc_lto=yes
    ])
  
  AC_ARG_ENABLE(
    lto,
    [  --enable-lto                   enable link time optimization (default: no)],
    gambas_lto=$enableval,
    gambas_lto=no
  )
  
  if test "$gambas_lto" = "no"; then
    have_gcc_lto=no;
    GB_CFLAGS_LTO="";
  fi
  
  if test "$have_gcc_lto" = "yes"; then
    AC_DEFINE(HAVE_GCC_LTO, 1, [Whether gcc supports -flto])
  fi
  
  dnl ---- check for -std=c++11 compiler flag
  
  GB_CXXFLAGS_GCC_OPTION([-std=c++11],,
    [
      GB_CXXFLAGS_STD_CPP11=" -std=c++11"
      have_gcc_std_cpp11=yes
    ])
  
  if test "$have_gcc_std_cpp11" = "yes"; then
    AC_DEFINE(HAVE_GCC_STD_CPP11, 1, [Whether g++ supports -std=c++11])
  fi
  
  dnl ---- check for -std=c++17 compiler flag
  
  GB_CXXFLAGS_GCC_OPTION([-std=c++17],,
    [
      GB_CXXFLAGS_STD_CPP17=" -std=c++17"
      have_gcc_std_cpp17=yes
    ])
  
  if test "$have_gcc_std_cpp17" = "yes"; then
    AC_DEFINE(HAVE_GCC_STD_CPP17, 1, [Whether g++ supports -std=c++17])
  fi
  
  dnl ---- check for -std=c++20 compiler flag

  GB_CXXFLAGS_GCC_OPTION([-std=c++20],,
    [
      GB_CXXFLAGS_STD_CPP20=" -std=c++20"
      have_gcc_std_cpp20=yes
    ])

  if test "$have_gcc_std_cpp20" = "yes"; then
    AC_DEFINE(HAVE_GCC_STD_CPP20, 1, [Whether g++ supports -std=c++20])
  fi

  dnl ---- Debug flags

  if test "$gambas_debug" = "yes"; then
    AM_CFLAGS="$AM_CFLAGS -g -ggdb"
    AM_CXXFLAGS="$AM_CXXFLAGS -g -ggdb"
  fi

  dnl ---- Optimization flags

  if test "x$gambas_optimization" = "xyes"; then
    AM_CFLAGS_OPT="$AM_CFLAGS -O3"
    AM_CFLAGS="$AM_CFLAGS -O2"
    AM_CXXFLAGS_OPT="$AM_CXXFLAGS -O3 -fno-omit-frame-pointer"
    AM_CXXFLAGS="$AM_CXXFLAGS -O2 -fno-omit-frame-pointer"
  else
    AM_CFLAGS_OPT="$AM_CFLAGS -O0"
    AM_CFLAGS="$AM_CFLAGS -O0"
    AM_CXXFLAGS_OPT="$AM_CXXFLAGS -O0"
    AM_CXXFLAGS="$AM_CXXFLAGS -O0"
  fi

  dnl ---- Checks for programs

  save_CFLAGS=$CFLAGS
  AC_PROG_CPP
  AC_PROG_CXX
  AC_PROG_CC
  AC_PROG_MAKE_SET
  CFLAGS=$save_CFLAGS

  AC_SUBST(AM_CFLAGS)
  AC_SUBST(AM_CFLAGS_OPT)
  AC_SUBST(AM_CXXFLAGS)
  AC_SUBST(AM_CXXFLAGS_OPT)
  AC_SUBST(GB_CFLAGS_LTO)
  AC_SUBST(GB_CFLAGS_NOCTE)
  AC_SUBST(GB_CXXFLAGS_STD_CPP11)
  AC_SUBST(GB_CXXFLAGS_STD_CPP17)
  AC_SUBST(GB_CXXFLAGS_STD_CPP20)

  rm -f DISABLED DISABLED.* FAILED
])


## ---------------------------------------------------------------------------
## GB_THREAD
## Detect threading compiler options
## ---------------------------------------------------------------------------

AC_DEFUN([GB_THREAD],
[
  case "${host}" in
    *-*-freebsd* | *-*-netbsd* | *-*-darwin* )
      THREAD_LIB=""
      THREAD_INC="-pthread -D_REENTRANT"
      GBX_THREAD_LIB=""
      GBX_THREAD_INC="-pthread -D_REENTRANT"
      GBX_THREAD_LDFLAGS=""
      ;;
    *-*-haiku* )
      THREAD_LIB=""
      THREAD_INC=""
      GBX_THREAD_LIB=""
      GBX_THREAD_INC=""
      GBX_THREAD_LDFLAGS=""
      ;;
    *)
      THREAD_LIB="-lpthread"
      THREAD_INC="-D_REENTRANT"
      GBX_THREAD_LIB="-lpthread"
      GBX_THREAD_INC="-D_REENTRANT"
      GBX_THREAD_LDFLAGS="-Wl,--no-as-needed"
      ;;
  esac

  AC_MSG_CHECKING(for threading compiler options)
  AC_MSG_RESULT($THREAD_INC)
  AC_MSG_CHECKING(for threading linker options)
  AC_MSG_RESULT($THREAD_LIB)

  AC_SUBST(THREAD_LIB)
  AC_SUBST(THREAD_INC)
  AC_SUBST(GBX_THREAD_LIB)
  AC_SUBST(GBX_THREAD_INC)
  AC_SUBST(GBX_THREAD_LDFLAGS)
])


## ---------------------------------------------------------------------------
## GB_LIBC
## Detect C library
## ---------------------------------------------------------------------------

AC_DEFUN([GB_LIBC],
[
  case "${host}" in
    *-*-haiku* )
      dnl Haiku has implicit C library in libroot.
      C_LIB=""
      ;;
    *)
      C_LIB="-lc"
      ;;
  esac

  AC_MSG_CHECKING(for C library)
  AC_MSG_RESULT($C_LIB)

  AC_SUBST(C_LIB)
])


## ---------------------------------------------------------------------------
## GB_MATH
## Detect mathematic libraries
## ---------------------------------------------------------------------------

AC_DEFUN([GB_MATH],
[
  case "${host}" in
    *-*-haiku* )
      MATH_LIB=""
      ;;
    *)
      MATH_LIB="-lm"
      ;;
  esac

  AC_MSG_CHECKING(for mathematic libraries)
  AC_MSG_RESULT($MATH_LIB)

  AC_SUBST(MATH_LIB)
])


## ---------------------------------------------------------------------------
## GB_CHECK_MATH_FUNC
## Check a specific mathematical function
##
##   $1 = name of the function
##   $2 = macro to define
## ---------------------------------------------------------------------------

AC_DEFUN([GB_CHECK_MATH_FUNC],
[AC_CACHE_CHECK(for $1,
  gb_cv_math_$1,
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
      #define _ISOC9X_SOURCE	1
      #define _ISOC99_SOURCE	1
      #define _GNU_SOURCE	1
      #define __USE_ISOC99	1
      #define __USE_ISOC9X	1
      #include <math.h>
    ]], [[
      int value = $1 (1.0);
    ]])],[gb_cv_math_$1=yes],[gb_cv_math_$1=no
    ])])
  
  if test $gb_cv_math_$1 = yes; then
    AC_DEFINE(HAVE_$2, 1, [Define if you have $1 function.])
  fi
])

## ---------------------------------------------------------------------------
## GB_MATH_FUNC
## Detect which mathematical functions are available
## ---------------------------------------------------------------------------

AC_DEFUN([GB_MATH_FUNC],
[
  ac_save_LDFLAGS="$LDFLAGS"
  LDFLAGS="$LDFLAGS -$MATH_LIB"

  GB_CHECK_MATH_FUNC(exp10, EXP10)
  GB_CHECK_MATH_FUNC(exp2, EXP2)
  GB_CHECK_MATH_FUNC(log2, LOG2)

  LDFLAGS=$ac_save_LDFLAGS
])


## ---------------------------------------------------------------------------
## GB_SYSTEM
## Detects the target system and its architecture
## ---------------------------------------------------------------------------

AC_DEFUN([GB_SYSTEM],
[
  AC_MSG_CHECKING(target system)

  case "${host}" in
    *-*-linux*-gnu* )
      SYSTEM=LINUX
      AC_DEFINE(OS_GNU, 1, [Target system is of GNU family])
      AC_DEFINE(OS_LINUX, 1, [Target system is Linux])
      AC_DEFINE(SYSTEM, "Linux", [Operating system])
      ;;
    *-*-linux* )
      SYSTEM=LINUX
      AC_DEFINE(OS_LINUX, 1, [Target system is Linux])
      AC_DEFINE(SYSTEM, "Linux", [Operating system])
      ;;
    *-*-freebsd* )
      SYSTEM=FREEBSD
      AC_DEFINE(OS_BSD, 1, [Target system is of BSD family])
      AC_DEFINE(OS_FREEBSD, 1, [Target system is FreeBSD])
      AC_DEFINE(SYSTEM, "FreeBSD", [Operating system])
      ;;
    *-*-netbsd* )
      SYSTEM=NETBSD
      AC_DEFINE(OS_BSD, 1, [Target system is of BSD family])
      AC_DEFINE(OS_NETBSD, 1, [Target system is NetBSD])
      AC_DEFINE(SYSTEM, "NetBSD", [Operating system])
      ;;
    *-*-openbsd* )
      SYSTEM=OPENBSD
      AC_DEFINE(OS_BSD, 1, [Target system is of BSD family])
      AC_DEFINE(OS_OPENBSD, 1, [Target system is OpenBSD])
      AC_DEFINE(SYSTEM, "OpenBSD", [Operating system])
      ;;
    *-*-cygwin* )
      SYSTEM=CYGWIN
      AC_DEFINE(OS_CYGWIN, 1, [Target system is Cygwin/Windows])
      AC_DEFINE(SYSTEM, "Cygwin", [Operating system])
      ;;
    *-*-darwin* | *-*-rhapsody* )
      SYSTEM=MACOSX
      AC_DEFINE(OS_BSD, 1, [Target system is of BSD family])
      AC_DEFINE(OS_FREEBSD, 1, [Target system is FreeBSD])
      AC_DEFINE(OS_MACOSX, 1, [Target system is MacOS X])
      AC_DEFINE(SYSTEM, "MacOSX", [Operating system])
      ;;
    *-*-solaris* )
      SYSTEM=SOLARIS
      AC_DEFINE(OS_SOLARIS, 1, [Target system is Solaris])
      AC_DEFINE(SYSTEM, "Solaris", [Operating system])
      ;;
    *-*-k*bsd*-gnu* )
      SYSTEM=KFREEBSD
      AC_DEFINE(OS_BSD, 1, [Target system is of BSD family])
      AC_DEFINE(OS_GNU, 1, [Target system is of GNU family])
      AC_DEFINE(OS_KFREEBSD, 1, [Target system is kFREEBSD])
      AC_DEFINE(SYSTEM, "kFreeBSD", [Operating system])
      ;;
    *-gnu* )
      SYSTEM=HURD
      AC_DEFINE(OS_GNU, 1, [Target system is of GNU family])
      AC_DEFINE(OS_HURD, 1, [Target system is Hurd])
      AC_DEFINE(SYSTEM, "Hurd", [Operating system])
      ;;
    *-*-haiku* )
      SYSTEM=HAIKU
      dnl AC_DEFINE(OS_GNU, 1, [Target system is of GNU family])
      AC_DEFINE(OS_HAIKU, 1, [Target system is Haiku])
      AC_DEFINE(SYSTEM, "Haiku", [Operating system])
      ;;      
    * )
      SYSTEM=UNKNOWN
      AC_DEFINE(SYSTEM, "unknown", [Operating system])
      GB_MESSAGE([System is unknown])
      ;;
  esac

  AC_MSG_RESULT($SYSTEM)

  AC_MSG_CHECKING(target architecture)

  case "${host}" in
    i*86-*-* )
      ARCH=X86
      AC_DEFINE(ARCH_X86, 1, [Target architecture is x86])
      AC_DEFINE(ARCHITECTURE, "x86", [Architecture])
      ;;
    x86_64-*-* | amd64-* | ia64-* )
      ARCH=X86_64
      AC_DEFINE(ARCH_X86_64, 1, [Target architecture is x86_64])
      AC_DEFINE(ARCHITECTURE, "x86_64", [Architecture])
      ;;
    arm*-*-* )
      ARCH=ARM
      AC_DEFINE(ARCH_ARM, 1, [Target architecture is ARM])
      AC_DEFINE(ARCHITECTURE, "arm", [Architecture])
      ;;
    aarch64*-*-* )
      ARCH=AARCH64
      AC_DEFINE(ARCH_AARCH64, 1, [Target architecture is AARCH64])
      AC_DEFINE(ARCHITECTURE, "aarch64", [Architecture])
      ;;
    powerpc*-*-* )
      ARCH=PPC
      AC_DEFINE(ARCH_PPC, 1, [Target architecture is PowerPC])
      AC_DEFINE(ARCHITECTURE, "powerpc", [Architecture])
      ;;
    e2k-*-* )
      ARCH=E2K
      AC_DEFINE(ARCH_E2K, 1, [Target architecture is e2k])
      AC_DEFINE(ARCHITECTURE, "e2k", [Architecture])
      ;;
    *)
      ARCH=UNKNOWN
      AC_DEFINE(ARCHITECTURE, "unknown", [Architecture])
      GB_MESSAGE([Architecture is unknown])
      ;;
  esac

  AC_MSG_RESULT($ARCH)
])


## ---------------------------------------------------------------------------
## GB_SHARED_LIBRARY_EXT
## Detects shared library extension
## ---------------------------------------------------------------------------

AC_DEFUN([GB_SHARED_LIBRARY_EXT],
[
  AC_MSG_CHECKING(which extension is used for shared libraries)

  case "${host}" in
    *-*-cygwin* )
      SHLIBEXT="dll.a"
      AC_DEFINE(SHARED_LIBRARY_EXT, "dll", [Shared library extension is '.dll.a'])
      ;;
    *-*-darwin* )
      SHLIBEXT="dylib"
      AC_DEFINE(SHARED_LIBRARY_EXT, "dylib", [Shared library extension is '.dylib'])
      ;;
    *)
      SHLIBEXT="so"
      AC_DEFINE(SHARED_LIBRARY_EXT, "so", [Shared library extension is '.so'])
      ;;
  esac

  AC_SUBST(SHLIBEXT)

  AC_MSG_RESULT([.$SHLIBEXT])
])


## ---------------------------------------------------------------------------
## GB_GETTEXT
## Detects if we must link to an external gettext library
## ---------------------------------------------------------------------------

AC_DEFUN([GB_GETTEXT],
[
  AC_MSG_CHECKING(for external gettext library)

  case "${host}" in
    *-*-openbsd* )
      GETTEXT_LIB=-llibgettext
      ;;
    *)
      GETTEXT_LIB=
      ;;
  esac

  AC_SUBST(GETTEXT_LIB)
  AC_SUBST(GETTEXT_LDFLAGS)

  AC_MSG_RESULT($GETTEXT_LIB)
])


## ---------------------------------------------------------------------------
## GB_INOTIFY
## Detects if we must link to an external inotify library
## ---------------------------------------------------------------------------

AC_DEFUN([GB_INOTIFY],
[
  AC_MSG_CHECKING(for external inotify library)

  case "${host}" in
    *-*-linux* )
      GB_INOTIFY_LIB=
      ;;
    *)
      GB_INOTIFY_LIB=-linotify
      ;;
  esac

  AC_SUBST(GB_INOTIFY_LIB)
  AC_MSG_RESULT($GB_INOTIFY_LIB)
])


## ---------------------------------------------------------------------------
## GB_INTL
## Detects if we must link to an external internationalization library
## ---------------------------------------------------------------------------

AC_DEFUN([GB_INTL],
[
  AC_MSG_CHECKING(for external internationalization library)

  case "${host}" in
    *-musl)
      GB_INTL_LIB=-lintl
      ;;
    *)
      GB_INTL_LIB=
      ;;
  esac

  AC_SUBST(GB_INTL_LIB)
  AC_MSG_RESULT($GB_INTL_LIB)
])


## ---------------------------------------------------------------------------
## GB_ICONV
## Detects if we must link to an external charset conversion library
## ---------------------------------------------------------------------------

AC_DEFUN([GB_ICONV],
[
  AC_MSG_CHECKING(for external charset conversion library)

  case "${host}" in
    *)
      GB_ICONV_LIB=
      ;;
  esac

  AC_SUBST(GB_ICONV_LIB)
  AC_MSG_RESULT($GB_ICONV_LIB)
])


## ---------------------------------------------------------------------------
## GB_MONOTONIC
## Detect monotonic clock
## ---------------------------------------------------------------------------

AC_DEFUN([GB_MONOTONIC],
[
  AC_CACHE_CHECK(for monotonic clock, gb_cv_monotonic_clock,
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
        #include <time.h>
        #ifdef HAVE_UNISTD_H
        #include <unistd.h>
        #endif
      ]], [[
        #if !defined(_POSIX_MONOTONIC_CLOCK) || _POSIX_MONOTONIC_CLOCK < 0 || !defined(CLOCK_MONOTONIC)
        #error Either _POSIX_MONOTONIC_CLOCK or CLOCK_MONOTONIC not defined
        #endif
      ]])],[
         gb_cv_monotonic_clock=yes
       ],[
         gb_cv_monotonic_clock=no
       ])
    )
   
  if test "$gb_cv_monotonic_clock" = "yes"; then
  
    AC_DEFINE(HAVE_MONOTONIC_CLOCK,1,[Have a monotonic clock])
    
    ac_save_LIBS="$LIBS"
    AC_SEARCH_LIBS(clock_gettime, rt)
    RT_LIB=$LIBS
    LIBS=$ac_save_LIBS
    
  fi
  
  AC_SUBST(RT_LIB)
  AC_SUBST(RT_LDFLAGS)
])




## ---------------------------------------------------------------------------
## GB_FIND
## Find files in directories
##
##   $1 = Files to search
##   $2 = Directories
##   $3 = Sub-directories patterns
##
##   Returns a path list in $gb_val
## ---------------------------------------------------------------------------

AC_DEFUN([GB_FIND],
[
dnl echo "Searching $1, $2, $3"
gb_val=""
gb_save=`pwd`
gb_file_list="$1"

gb_main_dir_list="$2"
gb_sub_dir_list="$3"

gb_sub_dir_list_64=`echo "$gb_sub_dir_list" | sed s/"lib"/"lib64"/g`

if test $SYSTEM == "HAIKU"; then
  gb_arch="`getarch`"
  gb_main_dir_list="$gb_main_dir_list `findpaths -c' ' -a "$gb_arch" B_FIND_PATH_DEVELOP_DIRECTORY`"
  gb_arch_inc_subdir=headers
  gb_arch_lib_subdir=lib
  if test "$gb_arch" != "`getarch -p`"; then
    gb_arch_inc_subdir="headers/$gb_arch"
    gb_arch_lib_subdir="lib/$gb_arch"
  fi
  gb_sub_dir_list=`echo "$gb_sub_dir_list" | sed "s:include:$gb_arch_inc_subdir:g;s:lib:$gb_arch_lib_subdir:g"`
fi

## if there is 'lib' inside sub-directories, then we decide to search "lib64" first.

if test "$gb_sub_dir_list_64" != "$gb_sub_dir_list"; then
  gb_sub_dir_list="$gb_sub_dir_list_64 $gb_sub_dir_list";

  gb_main_dir_list_64=`echo "$gb_main_dir_list" | sed s/"lib"/"lib64"/g`

  if test "$gb_main_dir_list_64" != "$gb_main_dir_list"; then
    gb_main_dir_list="$gb_main_dir_list_64 $gb_main_dir_list";
  fi

fi

for gb_main_dir in $gb_main_dir_list; do
  dnl echo "search $gb_main_dir"
  if test -d $gb_main_dir; then
    cd $gb_main_dir
    for gb_search_dir in $gb_sub_dir_list; do
      for gb_dir in $gb_search_dir/ $gb_search_dir/*/ $gb_search_dir/*/*/ $gb_search_dir/*/*/*/; do

        dnl echo "search subdir $gb_dir"
        gb_new_file_list=""
        gb_find_dir=""

        for gb_file in $gb_file_list; do

          dnl echo "search file $gb_file"
          gb_find=no
          if test -r "$gb_main_dir/$gb_dir/$gb_file" || test -d "$gb_main_dir/$gb_dir/$gb_file"; then

            ifelse($4,[],

              gb_find=yes,

              for gb_test in $4; do
                gb_output=`ls -la $gb_main_dir/$gb_dir/$gb_file | grep "$gb_test"`
                if test "x$gb_output" != "x"; then
                  gb_find=yes
                fi
              done
            )

          fi

          if test "$gb_find" = "yes"; then
            dnl echo "FOUND!"
            if test "x$gb_find_dir" = "x"; then
              if test "x$gb_val" = "x"; then
                gb_val="$gb_main_dir/$gb_dir"
              else
                gb_val="$gb_val $gb_main_dir/$gb_dir"
              fi
            fi
            gb_find_dir=yes
          else
            gb_new_file_list="$gb_new_file_list $gb_file"
          fi

        done

        gb_file_list=$gb_new_file_list

        if test "x$gb_file_list" = "x " || test "x$gb_file_list" = "x"; then
          break 3
        fi

      done
    done
  fi
done

if test "x$gb_file_list" != "x " && test "x$gb_file_list" != "x"; then
  gb_val=no
fi

cd $gb_save
])


## ---------------------------------------------------------------------------
## GB_COMPONENT_PKG_CONFIG
## Component detection macro based on pkg-config
##
##   $1 = Component key in lower case (ex: pgsql)
##   $2 = Component key in upper case (ex: PGSQL)
##   $3 = Component name (ex: gb.db.postgresql)
##   $4 = Sub-directory name
##   $5 = pkg-config module(s) name(s) with optional required version(s)
##   $6 = Warning message (optional)
##
##   => defines HAVE_*_COMPONENT (to know if you can compile the component)
##      *_INC (for the compiler) and *_LIB / *_LDFLAGS (for the linker)
## ---------------------------------------------------------------------------

AC_DEFUN([GB_COMPONENT_PKG_CONFIG],
[
  AC_REQUIRE([PKG_PROG_PKG_CONFIG])
  AC_ARG_ENABLE(
    $1,
    [  --enable-$1                enable $3 (default: yes)],
    gb_enable_$1=$enableval,
    gb_enable_$1=yes
  )

  dnl AC_ARG_WITH($1-includes,
  dnl   [  --with-$1-includes      where the $3 headers are located. ],
  dnl   [  gb_inc_$1="$withval" ])

  dnl AC_ARG_WITH($1-libraries,
  dnl   [  --with-$1-libraries     where the $3 libraries are located. ],
  dnl   [  gb_lib_$1="$withval" ])

  cp warnings.log warnings.log.before
  
  have_$1=no
  
  if test "$gb_enable_$1" = "yes" && test ! -e DISABLED && test ! -e DISABLED.$3; then

    AC_MSG_CHECKING(for $3 component with pkg-config)

    gb_inc_$1=""
    gb_lib_$1=""
    gb_ldflags_$1=""
    have_$1=yes
    gb_testval=""

    $PKG_CONFIG --silence-errors --exists $5
    if test $? -eq "0"; then

      ## Checking for headers

      $2_INC="`$PKG_CONFIG --cflags $5`"

      ## Checking for libraries

      $2_LIB="`$PKG_CONFIG --libs-only-l $5`"
      $2_LDFLAGS="`$PKG_CONFIG --libs-only-L $5` `$PKG_CONFIG --libs-only-other $5`"
      $2_DIR=$4

    else

      have_$1=no

    fi

  fi

  if test "$have_$1" = "no"; then

    if test "$gb_in_component_search" != "yes"; then
      touch DISABLED.$3
      if test "$gb_enable_$1" = "yes"; then
        touch FAILED
      fi
    fi

    if test "$gb_enable_$1" = "yes"; then
      AC_MSG_RESULT(failed)
    fi

    for pkgcmp in $5
    do

      $PKG_CONFIG --silence-errors --exists $pkgcmp
      if test $? -eq "1"; then
        GB_WARNING([Unable to met pkg-config requirement: $pkgcmp])
      fi

    done

  else

    AC_DEFINE(HAVE_$2_COMPONENT, 1, [Have $3 component])

    AC_MSG_RESULT(OK)

  fi

  if test "$have_$1" = "no"; then

    $2_INC=""
    $2_LIB=""
    $2_LDFLAGS=""
    $2_DIR=""
    if test "$gb_in_component_search" != "yes"; then
      if test x"$6" = x; then
        GB_MESSAGE([$3 is disabled])
      else
        GB_MESSAGE([$6])
      fi
    fi

  fi

  AC_SUBST($2_INC)
  AC_SUBST($2_LIB)
  AC_SUBST($2_LDFLAGS)
  AC_SUBST($2_DIR)
])


## ---------------------------------------------------------------------------
## GB_COMPONENT_PKG_CONFIG_AGAIN
## Try again a component detection macro based on pkg-config
##
##   $1 = Component key in lower case (ex: pgsql)
##   $2 = Component key in upper case (ex: PGSQL)
##   $3 = Component name (ex: gb.db.postgresql)
##   $4 = Sub-directory name
##   $5 = pkg-config module(s) name(s) with optional required version(s)
##   $6 = Try again message
##   $7 = Warning message (optional)
##
## ---------------------------------------------------------------------------

AC_DEFUN([GB_COMPONENT_PKG_CONFIG_AGAIN],
[
  if test "$have_$1" != "yes"; then

    AC_MSG_WARN([$6...])
    rm DISABLED.$3 FAILED;
    cp warnings.log.before warnings.log;

    GB_COMPONENT_PKG_CONFIG($1, $2, $3, $4, $5, $7)

  fi
])


## ---------------------------------------------------------------------------
## GB_COMPONENT
## Component detection macro that searches for files
##
##   $1 = Component key in lower case (ex: postgresql)
##   $2 = Component key in upper case (ex: POSTGRESQL)
##   $3 = Component name (ex: gb.db.postgresql)
##   $4 = Sub-directory name
##   $5 = How to get include path (must return it in gb_val)
##   $6 = How to get library path (must return it in gb_val)
##   $7 = Libraries
##   $8 = Compiler flags (optional)
##   $9 = Warning message (optional)
##
##   => defines HAVE_*_COMPONENT (to know if you can compile the component)
##      *_INC (for the compiler) and *_LIB (for the linker)
## ---------------------------------------------------------------------------

AC_DEFUN([GB_COMPONENT],
[
  AC_ARG_ENABLE(
    $1,
    [  --enable-$1                enable $3 (default: yes)],
    gb_enable_$1=$enableval,
    gb_enable_$1=yes
  )

  gb_inc_$1=no
  gb_lib_$1=no

  if test "$gb_enable_$1" = "yes" && test ! -e DISABLED && test ! -e DISABLED.$3; then

    ## Checking for headers

    AC_MSG_CHECKING(for $3 headers)

    AC_ARG_WITH($1-includes,
      [  --with-$1-includes      where the $3 headers are located. ],
      [  gb_inc_$1="$withval" ])

    AC_CACHE_VAL(gb_cv_header_$1, [

      if test "$gb_inc_$1" = no; then
        gb_val=""
        $5
        gb_inc_$1=$gb_val
      fi

      gb_cv_header_$1=$gb_inc_$1
    ])

    AC_MSG_RESULT([$gb_cv_header_$1])

    if test "$gb_cv_header_$1" = "no"; then
      for gb_result in $gb_file_list; do
        GB_WARNING([Unable to find file: $gb_result])
      done
    fi

    $2_INC=""

    for gb_dir in $gb_cv_header_$1; do
      if test "$gb_dir" != "/usr/include"; then
        if test "$gb_dir" != "/usr/include/"; then
          $2_INC="$$2_INC -I$gb_dir"
        fi
      fi
    done

    if test "x$8" != "x"; then
      $2_INC="$$2_INC $8"
    fi

    if test "$gb_cv_header_$1" = no; then
      have_inc_$1="no"
      $2_INC=""
    else
      have_inc_$1="yes"
    fi

    ## Checking for libraries

    AC_MSG_CHECKING(for $3 libraries)

    AC_ARG_WITH($1-libraries,
      [  --with-$1-libraries     where the $3 libraries are located. ],
      [  gb_lib_$1="$withval" ])

    AC_CACHE_VAL(gb_cv_lib_$1, [

      if test "$gb_lib_$1" = no; then
        gb_val=""
        $6
        gb_lib_$1=$gb_val
      fi

      gb_cv_lib_$1=$gb_lib_$1
    ])

    if test "$gb_cv_lib_$1" = no; then
      have_lib_$1="no"
    else
      have_lib_$1="yes"
    fi

    AC_MSG_RESULT([$gb_cv_lib_$1])

    if test "$gb_cv_lib_$1" = "no"; then
      for gb_result in $gb_file_list; do
        GB_WARNING([Unable to find file: $gb_result])
      done
    fi

    $2_LIB=""
    $2_LDFLAGS=""
    $2_PATH=""

    for gb_dir in $gb_cv_lib_$1; do
      if test "x$$2_PATH" = "x"; then
        $2_PATH="$gb_dir/.."
      fi
      if test "$gb_dir" != "/lib"  && test "$gb_dir" != "/lib/"&& test "$gb_dir" != "/usr/lib" && test "$gb_dir" != "/usr/lib/"; then
        $2_LDFLAGS="$$2_LDFLAGS -L$gb_dir";
      fi
    done

    $2_LIB="$$2_LIB $7"

  fi

  if test "$have_inc_$1" = "yes" && test "$have_lib_$1" = "yes"; then

    have_$1=yes
    $2_DIR=$4
    AC_DEFINE(HAVE_$2_COMPONENT, 1, Have $3)

  else

    have_$1=no
    touch DISABLED.$3
    if test "$gb_enable_$1" = "yes"; then
      touch FAILED
    fi

  fi

  if test "$have_$1" = "no"; then

    $2_INC=""
    $2_LIB=""
    $2_DIR=""
    $2_LDFLAGS=""
    if test x"$9" = x; then
      GB_WARNING([$3 is disabled])
    else
      GB_WARNING([$9])
    fi

  fi

  AC_SUBST($2_INC)
  AC_SUBST($2_LIB)
  AC_SUBST($2_LDFLAGS)
  AC_SUBST($2_DIR)
  AC_SUBST($2_PATH)

])


## ---------------------------------------------------------------------------
## GB_COMPONENT_SEARCH
## Component detection macro that uses GB_COMPONENT_PKG_CONFIG first, and
## then GB_COMPONENT.
##
##   $1  = Component key in lower case (ex: postgresql)
##   $2  = Component key in upper case (ex: POSTGRESQL)
##   $3  = Component name (ex: PostgreSQL)
##   $4  = Sub-directory name
##   $5  = pkg-config module name (optional)
##   $6  = How to get include path (must return it in gb_val)
##   $7  = How to get library path (must return it in gb_val)
##   $8  = Libraries
##   $9  = Compiler flags (optional)
##   $10 = Warning message (optional)
##
##   => defines HAVE_*_COMPONENT (to know if you can compile the component)
##      *_INC (for the compiler) and *_LIB (for the linker)
## ---------------------------------------------------------------------------

AC_DEFUN([GB_COMPONENT_SEARCH],
[
gb_in_component_search=yes
  GB_COMPONENT_PKG_CONFIG(
    $1,
    $2,
    $3,
    $4,
    $5,
    $10
  )
gb_in_component_search=no
  if test -z "${$2_LIB}"; then
    GB_COMPONENT(
      $1,
      $2,
      $3,
      $4,
      $6,
      $7,
      $8,
      $9,
      $10
    )
  fi
])


## ---------------------------------------------------------------------------
## GB_COMPONENT_SEARCH_BOTH
## Component detection macro that uses GB_COMPONENT_PKG_CONFIG and
## GB_COMPONENT. both having to succeed
##
##   $1  = Component key in lower case (ex: postgresql)
##   $2  = Component key in upper case (ex: POSTGRESQL)
##   $3  = Component name (ex: gb.db.postgresql)
##   $4  = Sub-directory name
##   $5  = pkg-config module name (optional)
##   $6  = How to get include path (must return it in gb_val)
##   $7  = How to get library path (must return it in gb_val)
##   $8  = Libraries
##   $9  = Compiler flags (optional)
##   $10 = Warning message (optional)
##
##   => defines HAVE_*_COMPONENT (to know if you can compile the component)
##      *_INC (for the compiler) and *_LIB (for the linker)
## ---------------------------------------------------------------------------

AC_DEFUN([GB_COMPONENT_SEARCH_BOTH],
[
  GB_COMPONENT_PKG_CONFIG(
    $1,
    $2,
    $3,
    $4,
    $5,
    $10
  )
  if test ! -e DISABLED.$3; then
    GB_COMPONENT(
      $1,
      $2,
      $3,
      $4,
      $6,
      $7,
      $8,
      $9,
      $10
    )
  fi
])


## ---------------------------------------------------------------------------
## GB_FIND_QT_MOC
## Find QT moc compiler
##
##   $1 = QT version
##   $2 = components to disable
##
##   Returns a path list in $gb_val
## ---------------------------------------------------------------------------

AC_DEFUN([GB_FIND_QT_MOC],
[
  gb_path_qt_moc=no
  if test x$1 = x; then
    gb_qt_version=3
  else
    gb_qt_version=$1
  fi

  AC_ARG_WITH(moc,
    [  --with-moc      The path to the QT moc compiler. ],
    [  gb_path_qt_moc="$withval" ])

  AC_MSG_CHECKING(for QT meta-object compiler)

  AC_CACHE_VAL(gb_cv_path_qt_moc, [

    gb_val=""
    if test "$gb_path_qt_moc" = no; then

      for gb_dir in $QTDIR /usr/lib/qt$gb_qt_version /usr/lib/qt/$gb_qt_version /usr/local/lib/qt$gb_qt_version /usr/local/lib/qt/$gb_qt_version /usr/local/qt$gb_qt_version /usr/local/qt/$gb_qt_version /usr/share/qt$gb_qt_version /usr/qt/$gb_qt_version /usr/pkg/qt$gb_qt_version /usr/pkg /usr; do

        gb_dir=$gb_dir/bin

        if test -r "$gb_dir/moc"; then
          if test "x`$gb_dir/moc -v 2>&1 | grep " $gb_qt_version\."`" != x; then
            gb_val=$gb_dir/moc
            break
          fi
        fi

      done

      gb_path_qt_moc=$gb_val
    fi

    gb_cv_path_qt_moc=$gb_path_qt_moc
  ])

  AC_MSG_RESULT([$gb_cv_path_qt_moc])

  if test x"$gb_cv_path_qt_moc" = x; then
    GB_WARNING([QT moc compiler not found. Try --with-moc option.])
    MOC=""
    touch DISABLED
  else
    MOC=$gb_cv_path_qt_moc
  fi

  AC_SUBST(MOC)
])

## ---------------------------------------------------------------------------
## GB_CHECK_XWINDOW
## Check the X-Window system installation
##
##   $1 = components to disable
## ---------------------------------------------------------------------------

AC_DEFUN([GB_CHECK_XWINDOW],
[
  AC_PATH_XTRA

  if test x"$have_x" = xyes; then
    if test -z `echo $X_LIBS | grep "\-lX11"`; then
      X_LIBS="$X_LIBS -lX11"
    fi
    if test -z `echo $X_LIBS | grep "\-lXext"`; then
      X_LIBS="$X_LIBS -lXext"
    fi
    X_LIBS="$X_PRE_LIBS $X_LIBS"
  else
    touch DISABLED
  fi

])

## ---------------------------------------------------------------------------
## GB_CHECK_MYSQL_CONSTANT
## Check a MySQL / MariaDB constant
##
##  $1 = option name in upper case
## ---------------------------------------------------------------------------

AC_DEFUN([GB_CHECK_MYSQL_CONSTANT],
[AC_CACHE_CHECK(for $1 option,
  gb_cv_mysql_$1,
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
      #include <mysql.h>
    ]], [[
      int value = MYSQL_$1;
    ]])],[gb_cv_mysql_$1=yes],[gb_cv_mysql_$1=no
    ])])
  
  if test $gb_cv_mysql_$1 = yes; then
    AC_DEFINE(HAVE_MYSQL_$1, 1, [Define if you have MYSQL_$1 constant.])
  fi
])


## ---------------------------------------------------------------------------
## Some macros
## ---------------------------------------------------------------------------

dnl Like AC_CHECK_HEADER, but it uses the already-computed -I directories.

AC_DEFUN([AC_CHECK_X_HEADER], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  if test \! -z "$includedir" ; then
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
  AC_CHECK_HEADER([$1],[$2],[$3])
  CPPFLAGS="$ac_save_CPPFLAGS"
])

dnl Like AC_CHECK_LIB, but it used the -L dirs set up by the X checks.

AC_DEFUN([AC_CHECK_X_LIB], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  ac_save_LDFLAGS="$LDFLAGS"

  if test \! -z "$includedir" ; then
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi

  dnl note: $X_CFLAGS includes $x_includes
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"

  if test \! -z "$libdir" ; then
    LDFLAGS="$LDFLAGS -L$libdir"
  fi

  dnl note: $X_LIBS includes $x_libraries

  LDFLAGS="$LDFLAGS $X_LIBS"
  AC_CHECK_LIB([$1], [$2], [$3], [$4], [$5])
  CPPFLAGS="$ac_save_CPPFLAGS"
  LDFLAGS="$ac_save_LDFLAGS"]
)

dnl Check if it is possible to turn off run time type information (RTTI)
AC_DEFUN([AC_PROG_CXX_FNO_RTTI],
[AC_CACHE_CHECK(whether ${CXX-g++} accepts -fno-rtti, ac_cv_prog_cxx_fno_rtti,
[echo 'void f(){}' > conftest.cc
if test -z "`${CXX-g++} -fno-rtti -c conftest.cc 2>&1`"; then
  ac_cv_prog_cxx_fno_rtti=yes
  CXXFLAGS="${CXXFLAGS} -fno-rtti"
else
  ac_cv_prog_cxx_fno_rtti=no
fi
rm -f conftest*
])])

dnl Check if the type socklen_t is defined anywhere
AC_DEFUN([AC_C_SOCKLEN_T],
[AC_CACHE_CHECK(for socklen_t, ac_cv_c_socklen_t,
[ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/socket.h>
]], [[
socklen_t foo;
]])],[
  ac_cv_c_socklen_t=yes
],[
  ac_cv_c_socklen_t=no
  AC_DEFINE(socklen_t,int)
])])])

dnl Check for sys_errlist[] and sys_nerr, check for declaration
dnl Check nicked from aclocal.m4 from GNU bash 2.01
AC_DEFUN([AC_SYS_ERRLIST],
[AC_MSG_CHECKING([for sys_errlist and sys_nerr])
AC_CACHE_VAL(ac_cv_sys_errlist,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <errno.h>]], [[extern char *sys_errlist[];
 extern int sys_nerr;
 char *msg = sys_errlist[sys_nerr - 1];]])],[ac_cv_sys_errlist=yes],[ac_cv_sys_errlist=no])])dnl
AC_MSG_RESULT($ac_cv_sys_errlist)
if test $ac_cv_sys_errlist = yes; then
AC_DEFINE(HAVE_SYS_ERRLIST)
fi
])

dnl @synopsis AX_CFLAGS_GCC_OPTION (optionflag [,[shellvar][,[A][,[NA]]])
dnl
dnl AX_CFLAGS_GCC_OPTION(-fvomit-frame) would show a message as like
dnl "checking CFLAGS for gcc -fvomit-frame ... yes" and adds the
dnl optionflag to CFLAGS if it is understood. You can override the
dnl shellvar-default of CFLAGS of course. The order of arguments stems
dnl from the explicit macros like AX_CFLAGS_WARN_ALL.
dnl
dnl The cousin AX_CXXFLAGS_GCC_OPTION would check for an option to add
dnl to CXXFLAGS - and it uses the autoconf setup for C++ instead of C
dnl (since it is possible to use different compilers for C and C++).
dnl
dnl The macro is a lot simpler than any special AX_CFLAGS_* macro (or
dnl ac_cxx_rtti.m4 macro) but allows to check for arbitrary options.
dnl However, if you use this macro in a few places, it would be great
dnl if you would make up a new function-macro and submit it to the
dnl ac-archive.
dnl
dnl   - $1 option-to-check-for : required ("-option" as non-value)
dnl   - $2 shell-variable-to-add-to : CFLAGS (or CXXFLAGS in the other case)
dnl   - $3 action-if-found : add value to shellvariable
dnl   - $4 action-if-not-found : nothing
dnl
dnl note: in earlier versions, $1-$2 were swapped. We try to detect the
dnl situation and accept a $2=~/-/ as being the old
dnl option-to-check-for.
dnl
dnl also: there are other variants that emerged from the original macro
dnl variant which did just test an option to be possibly added.
dnl However, some compilers accept an option silently, or possibly for
dnl just another option that was not intended. Therefore, we have to do
dnl a generic test for a compiler family. For gcc we check "-pedantic"
dnl being accepted which is also understood by compilers who just want
dnl to be compatible with gcc even when not being made from gcc
dnl sources.
dnl
dnl see also:
dnl
dnl       AX_CFLAGS_SUN_OPTION               AX_CFLAGS_HPUX_OPTION
dnl       AX_CFLAGS_AIX_OPTION               AX_CFLAGS_IRIX_OPTION
dnl
dnl @category C
dnl @author Guido Draheim <guidod@gmx.de>
dnl @version 2003-11-04
dnl @license GPLWithACException

AC_DEFUN([AX_CFLAGS_GCC_OPTION_OLD], [dnl
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$2])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
VAR,[VAR="no, unknown"
 AC_LANG_SAVE
 AC_LANG([C])
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic  % m4_ifval($2,$2,-option)"  dnl   GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[return 0;]])],[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break],[])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])


dnl the only difference - the LANG selection... and the default FLAGS

AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_OLD], [dnl
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$2])dnl
AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for gcc m4_ifval($2,$2,-option)],
VAR,[VAR="no, unknown"
 AC_LANG_SAVE
 AC_LANG_CXX
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic  % m4_ifval($2,$2,-option)"  dnl   GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[return 0;]])],[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break],[])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR])
   else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"])
                      m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])

dnl -------------------------------------------------------------------------

AC_DEFUN([AX_CFLAGS_GCC_OPTION_NEW], [dnl
AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_gcc_option_$1])dnl
AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
VAR,[VAR="no, unknown"
 AC_LANG_SAVE
 AC_LANG([C])
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic  % m4_ifval($1,$1,-option)"  dnl   GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[return 0;]])],[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break],[])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
   else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
                      m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])


dnl the only difference - the LANG selection... and the default FLAGS

AC_DEFUN([AX_CXXFLAGS_GCC_OPTION_NEW], [dnl
AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl
AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_gcc_option_$1])dnl
AC_CACHE_CHECK([m4_ifval($2,$2,FLAGS) for gcc m4_ifval($1,$1,-option)],
VAR,[VAR="no, unknown"
 AC_LANG_SAVE
 AC_LANG_CXX
 ac_save_[]FLAGS="$[]FLAGS"
for ac_arg dnl
in "-pedantic  % m4_ifval($1,$1,-option)"  dnl   GCC
   #
do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[return 0;]])],[VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break],[])
done
 FLAGS="$ac_save_[]FLAGS"
 AC_LANG_RESTORE
])
case ".$VAR" in
     .ok|.ok,*) m4_ifvaln($3,$3) ;;
   .|.no|.no,*) m4_ifvaln($4,$4) ;;
   *) m4_ifvaln($3,$3,[
   if echo " $[]m4_ifval($2,$2,FLAGS) " | grep " $VAR " 2>&1 >/dev/null
   then AC_RUN_LOG([: m4_ifval($2,$2,FLAGS) does contain $VAR])
   else AC_RUN_LOG([: m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"])
                      m4_ifval($2,$2,FLAGS)="$m4_ifval($2,$2,FLAGS) $VAR"
   fi ]) ;;
esac
AS_VAR_POPDEF([VAR])dnl
AS_VAR_POPDEF([FLAGS])dnl
])

AC_DEFUN([AX_CFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
[AX_CFLAGS_GCC_OPTION_NEW($@)],[AX_CFLAGS_GCC_OPTION_OLD($@)])])

AC_DEFUN([AX_CXXFLAGS_GCC_OPTION],[ifelse(m4_bregexp([$2],[-]),-1,
[AX_CXXFLAGS_GCC_OPTION_NEW($@)],[AX_CXXFLAGS_GCC_OPTION_OLD($@)])])


