dnl ---------------------------------------------------------------------------
dnl Support macros for makefiles generated by BAKEFILE.
dnl ---------------------------------------------------------------------------

dnl Lots of compiler & linker detection code contained here was taken from
dnl wxWindows configure.in script (see http://www.wxwindows.org)



dnl ---------------------------------------------------------------------------
dnl AC_BAKEFILE_GNUMAKE
dnl
dnl Detects GNU make
dnl ---------------------------------------------------------------------------

AC_DEFUN([AC_BAKEFILE_GNUMAKE],
[
    dnl does make support "-include" (only GNU make does AFAIK)?
    AC_CACHE_CHECK([if make is GNU make], bakefile_cv_prog_makeisgnu,
    [
        if ( ${SHELL-sh} -c "${MAKE-make} --version" 2> /dev/null |
                egrep -s GNU > /dev/null); then
            bakefile_cv_prog_makeisgnu="yes"
        else
            bakefile_cv_prog_makeisgnu="no"
        fi
    ])

    if test "x$bakefile_cv_prog_makeisgnu" = "xyes"; then
        IF_GNU_MAKE=""
    else
        IF_GNU_MAKE="#"
    fi
    AC_SUBST(IF_GNU_MAKE)
])

dnl ---------------------------------------------------------------------------
dnl AC_BAKEFILE_PLATFORM
dnl
dnl Detects platform and sets PLATFORM_XXX variables accordingly
dnl ---------------------------------------------------------------------------

AC_DEFUN([AC_BAKEFILE_PLATFORM],
[
    PLATFORM_UNIX=0
    PLATFORM_WIN32=0
    PLATFORM_MSDOS=0
    PLATFORM_MAC=0
    PLATFORM_MACOS=0
    PLATFORM_MACOSX=0
    PLATFORM_OS2=0
    PLATFORM_BEOS=0

    if test "x$BAKEFILE_FORCE_PLATFORM" = "x"; then 
        case "${BAKEFILE_HOST}" in
            *-*-mingw32* )
                PLATFORM_WIN32=1
            ;;
            *-pc-msdosdjgpp )
                PLATFORM_MSDOS=1
            ;;
            *-pc-os2_emx | *-pc-os2-emx )
                PLATFORM_OS2=1
            ;;
            *-*-darwin* )
                PLATFORM_MAC=1
                PLATFORM_MACOSX=1
            ;; 
            *-*-beos* )
                PLATFORM_BEOS=1
            ;;
            powerpc-apple-macos* )
                PLATFORM_MAC=1
                PLATFORM_MACOS=1
            ;;
            * )
                PLATFORM_UNIX=1
            ;;
        esac
    else
        case "$BAKEFILE_FORCE_PLATFORM" in
            win32 )
                PLATFORM_WIN32=1
            ;;
            msdos )
                PLATFORM_MSDOS=1
            ;;
            os2 )
                PLATFORM_OS2=1
            ;;
            darwin )
                PLATFORM_MAC=1
                PLATFORM_MACOSX=1
            ;;
            unix )
                PLATFORM_UNIX=1
            ;;
            beos )
                PLATFORM_BEOS=1
            ;;
            * )
                AC_MSG_ERROR([Unknown platform: $BAKEFILE_FORCE_PLATFORM])
            ;;
        esac
    fi

    AC_SUBST(PLATFORM_UNIX)
    AC_SUBST(PLATFORM_WIN32)
    AC_SUBST(PLATFORM_MSDOS)
    AC_SUBST(PLATFORM_MAC)
    AC_SUBST(PLATFORM_MACOS)
    AC_SUBST(PLATFORM_MACOSX)
    AC_SUBST(PLATFORM_OS2)
    AC_SUBST(PLATFORM_BEOS)
])


dnl ---------------------------------------------------------------------------
dnl AC_BAKEFILE_PLATFORM_SPECIFICS
dnl
dnl Sets misc platform-specific settings
dnl ---------------------------------------------------------------------------

AC_DEFUN([AC_BAKEFILE_PLATFORM_SPECIFICS],
[
    AC_ARG_ENABLE([omf], AS_HELP_STRING([--enable-omf],
                                        [use OMF object format (OS/2)]),
                  [bk_os2_use_omf="$enableval"])
    
    case "${BAKEFILE_HOST}" in
      *-*-darwin* )
        dnl For Unix to MacOS X porting instructions, see:
        dnl http://fink.sourceforge.net/doc/porting/porting.html
        if test "x$GCC" = "xyes"; then
            CFLAGS="$CFLAGS -fno-common"
            CXXFLAGS="$CXXFLAGS -fno-common"
        fi
        if test "x$XLCC" = "xyes"; then
            CFLAGS="$CFLAGS -qnocommon"
            CXXFLAGS="$CXXFLAGS -qnocommon"
        fi
        ;;

      *-pc-os2_emx | *-pc-os2-emx )
        if test "x$bk_os2_use_omf" = "xyes" ; then
            AR=emxomfar
            RANLIB=:
            LDFLAGS="-Zomf $LDFLAGS"
            CFLAGS="-Zomf $CFLAGS"
            CXXFLAGS="-Zomf $CXXFLAGS"
            OS2_LIBEXT="lib"
        else
            OS2_LIBEXT="a"
        fi
        ;;
      
      i*86-*-beos* )
        LDFLAGS="-L/boot/develop/lib/x86 $LDFLAGS"
        ;;
    esac
])

dnl ---------------------------------------------------------------------------
dnl AC_BAKEFILE_SUFFIXES
dnl
dnl Detects shared various suffixes for shared libraries, libraries, programs,
dnl plugins etc.
dnl ---------------------------------------------------------------------------

AC_DEFUN([AC_BAKEFILE_SUFFIXES],
[
    SO_SUFFIX="so"
    SO_SUFFIX_MODULE="so"
    EXEEXT=""
    LIBPREFIX="lib"
    LIBEXT=".a"
    DLLPREFIX="lib"
    DLLPREFIX_MODULE=""
    DLLIMP_SUFFIX=""
    dlldir="$libdir"
    
    case "${BAKEFILE_HOST}" in
        *-hp-hpux* )
            SO_SUFFIX="sl"
            SO_SUFFIX_MODULE="sl"
        ;;
        *-*-aix* )
            dnl quoting from
            dnl http://www-1.ibm.com/servers/esdd/articles/gnu.html:
            dnl     Both archive libraries and shared libraries on AIX have an
            dnl     .a extension. This will explain why you can't link with an
            dnl     .so and why it works with the name changed to .a.
            SO_SUFFIX="a"
            SO_SUFFIX_MODULE="a"
        ;;
        *-*-cygwin* )
            SO_SUFFIX="dll"
            SO_SUFFIX_MODULE="dll"
            DLLIMP_SUFFIX="dll.a"
            EXEEXT=".exe"
            DLLPREFIX="cyg"
            dlldir="$bindir"
        ;;
        *-*-mingw32* )
            SO_SUFFIX="dll"
            SO_SUFFIX_MODULE="dll"
            DLLIMP_SUFFIX="dll.a"
            EXEEXT=".exe"
            DLLPREFIX=""
            dlldir="$bindir"
        ;;
        *-pc-msdosdjgpp )
            EXEEXT=".exe"
            DLLPREFIX=""
            dlldir="$bindir"
        ;;
        *-pc-os2_emx | *-pc-os2-emx )
            SO_SUFFIX="dll"
            SO_SUFFIX_MODULE="dll"
            DLLIMP_SUFFIX=$OS2_LIBEXT
            EXEEXT=".exe"
            DLLPREFIX=""
            LIBPREFIX=""
            LIBEXT=".$OS2_LIBEXT"
            dlldir="$bindir"
        ;;
        *-*-darwin* )
            SO_SUFFIX="dylib"
            SO_SUFFIX_MODULE="bundle"
        ;;
    esac

    if test "x$DLLIMP_SUFFIX" = "x" ; then
        DLLIMP_SUFFIX="$SO_SUFFIX"
    fi

    AC_SUBST(SO_SUFFIX)
    AC_SUBST(SO_SUFFIX_MODULE)
    AC_SUBST(DLLIMP_SUFFIX)
    AC_SUBST(EXEEXT)
    AC_SUBST(LIBPREFIX)
    AC_SUBST(LIBEXT)
    AC_SUBST(DLLPREFIX)
    AC_SUBST(DLLPREFIX_MODULE)
    AC_SUBST(dlldir)
])


dnl ---------------------------------------------------------------------------
dnl AC_BAKEFILE_SHARED_LD
dnl
dnl Detects command for making shared libraries, substitutes SHARED_LD_CC
dnl and SHARED_LD_CXX.
dnl ---------------------------------------------------------------------------

AC_DEFUN([AC_BAKEFILE_SHARED_LD],
[
    dnl the extra compiler flags needed for compilation of shared library
    PIC_FLAG=""
    if test "x$GCC" = "xyes"; then
        dnl the switch for gcc is the same under all platforms
        PIC_FLAG="-fPIC"
    fi
    
    dnl Defaults for GCC and ELF .so shared libs:
    SHARED_LD_CC="\$(CC) -shared ${PIC_FLAG} -o"
    SHARED_LD_CXX="\$(CXX) -shared ${PIC_FLAG} -o"
    WINDOWS_IMPLIB=0

    case "${BAKEFILE_HOST}" in
      *-hp-hpux* )
        dnl default settings are good for gcc but not for the native HP-UX
        if test "x$GCC" != "xyes"; then
            dnl no idea why it wants it, but it does
            LDFLAGS="$LDFLAGS -L/usr/lib"

            SHARED_LD_CC="${CC} -b -o"
            SHARED_LD_CXX="${CXX} -b -o"
            PIC_FLAG="+Z"
        fi
      ;;

      *-*-linux* )
        if test "x$GCC" != "xyes"; then
            AC_CACHE_CHECK([for Intel compiler], bakefile_cv_prog_icc,
            [
                AC_TRY_COMPILE([],
                    [
                        #ifndef __INTEL_COMPILER
                        #error Not ICC
                        #endif
                    ],
                    bakefile_cv_prog_icc=yes,
                    bakefile_cv_prog_icc=no
                )
            ])
            if test "$bakefile_cv_prog_icc" = "yes"; then
                PIC_FLAG="-KPIC"
            fi
        fi
      ;;

      *-*-solaris2* )
        if test "x$GCC" != xyes ; then
            SHARED_LD_CC="${CC} -G -o"
            SHARED_LD_CXX="${CXX} -G -o"
            PIC_FLAG="-KPIC"
        fi
      ;;

      *-*-darwin* )
        AC_BAKEFILE_CREATE_FILE_SHARED_LD_SH
        chmod +x shared-ld-sh

        SHARED_LD_MODULE_CC="`pwd`/shared-ld-sh -bundle -headerpad_max_install_names -o"
        SHARED_LD_MODULE_CXX="$SHARED_LD_MODULE_CC"

        dnl Most apps benefit from being fully binded (its faster and static
        dnl variables initialized at startup work).
        dnl This can be done either with the exe linker flag -Wl,-bind_at_load
        dnl or with a double stage link in order to create a single module
        dnl "-init _wxWindowsDylibInit" not useful with lazy linking solved

        dnl If using newer dev tools then there is a -single_module flag that
        dnl we can use to do this for dylibs, otherwise we'll need to use a helper
        dnl script.  Check the version of gcc to see which way we can go:
        AC_CACHE_CHECK([for gcc 3.1 or later], bakefile_cv_gcc31, [
           AC_TRY_COMPILE([],
               [
                   #if (__GNUC__ < 3) || \
                       ((__GNUC__ == 3) && (__GNUC_MINOR__ < 1))
                       #error old gcc
                   #endif
               ],
               [
                   bakefile_cv_gcc31=yes
               ],
               [
                   bakefile_cv_gcc31=no
               ]
           )
        ])
        if test "$bakefile_cv_gcc31" = "no"; then
            dnl Use the shared-ld-sh helper script
            SHARED_LD_CC="`pwd`/shared-ld-sh -dynamiclib -headerpad_max_install_names -o"
            SHARED_LD_CXX="$SHARED_LD_CC"
        else
            dnl Use the -single_module flag and let the linker do it for us
            SHARED_LD_CC="\${CC} -dynamiclib -single_module -headerpad_max_install_names -o"
            SHARED_LD_CXX="\${CXX} -dynamiclib -single_module -headerpad_max_install_names -o"
        fi

        if test "x$GCC" == "xyes"; then
            PIC_FLAG="-dynamic -fPIC"
        fi
        if test "x$XLCC" = "xyes"; then
            PIC_FLAG="-dynamic -DPIC"
        fi
      ;;

      *-*-aix* )
        if test "x$GCC" = "xyes"; then
            dnl at least gcc 2.95 warns that -fPIC is ignored when
            dnl compiling each and every file under AIX which is annoying,
            dnl so don't use it there (it's useless as AIX runs on
            dnl position-independent architectures only anyhow)
            PIC_FLAG=""

            dnl -bexpfull is needed by AIX linker to export all symbols (by
            dnl default it doesn't export any and even with -bexpall it
            dnl doesn't export all C++ support symbols, e.g. vtable
            dnl pointers) but it's only available starting from 5.1 (with
            dnl maintenance pack 2, whatever this is), see
            dnl http://www-128.ibm.com/developerworks/eserver/articles/gnu.html
            case "${BAKEFILE_HOST}" in
                *-*-aix5* )
                    LD_EXPFULL="-Wl,-bexpfull"
                    ;;
            esac

            SHARED_LD_CC="\$(CC) -shared $LD_EXPFULL -o"
            SHARED_LD_CXX="\$(CXX) -shared $LD_EXPFULL -o"
        else
            dnl FIXME: makeC++SharedLib is obsolete, what should we do for
            dnl        recent AIX versions?
            AC_CHECK_PROG(AIX_CXX_LD, makeC++SharedLib,
                          makeC++SharedLib, /usr/lpp/xlC/bin/makeC++SharedLib)
            SHARED_LD_CC="$AIX_CC_LD -p 0 -o"
            SHARED_LD_CXX="$AIX_CXX_LD -p 0 -o"