dnl ==========================================================================
dnl
dnl Autoconf script for Xvid
dnl
dnl Copyright(C) 2003-2004 Edouard Gomez <ed.gomez@free.fr>
dnl
dnl ==========================================================================

AC_PREREQ([2.50])

AC_INIT([Xvid], [1.2.0], [xvid-devel@xvid.org])
AC_CONFIG_SRCDIR(configure.in)

dnl Do not forget to increase that when needed.
API_MAJOR="4"
API_MINOR="1"

dnl NASM version requirement
minimum_nasm_minor_version=0
minimum_nasm_major_version=2
nasm_prog="nasm"

dnl Default CFLAGS -- Big impact on overall speed
our_cflags_defaults="-Wall"
our_cflags_defaults="$our_cflags_defaults -O2"
our_cflags_defaults="$our_cflags_defaults -fstrength-reduce"
our_cflags_defaults="$our_cflags_defaults -finline-functions"
our_cflags_defaults="$our_cflags_defaults -ffast-math"
our_cflags_defaults="$our_cflags_defaults -fomit-frame-pointer"

dnl ==========================================================================
dnl Features - configure options
dnl ==========================================================================

FEATURES=""

dnl Internal Debug
AC_ARG_ENABLE(idebug,
		AC_HELP_STRING([--enable-idebug],
				 [Enable internal debug function]),
		 [if test "$enable_idebug" = "yes" ; then
		     FEATURES="$FEATURES -D_DEBUG"
		  fi])

dnl Internal Profile
AC_ARG_ENABLE(iprofile,
		AC_HELP_STRING([--enable-iprofile],
				 [Enable internal profiling]),
		 [if test "$enable_iprofile" = "yes" ; then
		     FEATURES="$FEATURES -D_PROFILING_"
		  fi])

dnl GNU Profiling options
AC_ARG_ENABLE(gnuprofile,
		AC_HELP_STRING([--enable-gnuprofile],
				 [Enable profiling informations for gprof]),
		 [if test "$enable_gnuprofile" = "yes" ; then
		     GNU_PROF_CFLAGS="-pg -fprofile-arcs -ftest-coverage"
		     GNU_PROF_LDFLAGS="-pg"
		  fi])

dnl Assembly code
AC_ARG_ENABLE(assembly,
		AC_HELP_STRING([--disable-assembly],
				 [Disable assembly code]),
		 [if test "$enable_assembly" = "no" ; then
		     assembly="no"
		  else
		     if test "$enable_assembly" = "yes" ; then
			assembly="yes"
		     fi
		  fi],
		 [assembly="yes"])

dnl Build as a module not a shared lib on darwin
AC_ARG_ENABLE(macosx_module,
		AC_HELP_STRING([--enable-macosx_module],
				 [Build as a module on MacOS X]),
		 [if test "$enable_macosx_module" = "yes" ; then
		     macosx_module="yes"
		  else 
		     macosx_module="no"
		  fi],
		  [macosx_module="no"])

dnl ==========================================================================
dnl Default install prefix and checks build type
dnl ==========================================================================

AC_PREFIX_DEFAULT("/usr/local")
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

dnl ==========================================================================
dnl Check for the C compiler (could be passed on command line)
dnl ==========================================================================

dnl
dnl First we test if CFLAGS have been passed on command line
dnl I do that because autoconf defaults (-g -O2) suck and they would kill
dnl performance. To prevent that we define a good defult CFLAGS at the end
dnl of the script if and only if CFLAGS has not been passed on the command
dnl line
dnl
AC_MSG_CHECKING(whether to use default CFLAGS)
if test  x"$CFLAGS" = x"" ; then
   force_default_cc_options="yes"
   AC_MSG_RESULT([yes])
else
   force_default_cc_options="no"
   AC_MSG_RESULT([no])
fi

dnl Now we can safely check for the C compiler
AC_PROG_CC

dnl ==========================================================================
dnl Check for the install program
dnl ==========================================================================

AC_PROG_INSTALL

dnl ==========================================================================
dnl Check for the ranlib program to generate static library index
dnl ==========================================================================

AC_PROG_RANLIB

dnl ==========================================================================
dnl
dnl This part looks for:
dnl
dnl ARCHITECTURE : The platform architecture
dnl                - IA32 for mmx, mmx-ext, mmx2, sse assembly
dnl                - IA64
dnl                - PPC for PowerPC assembly routines
dnl                - GENERIC for plain C sources only
dnl
dnl BUS: Address bus size (in bits)
dnl      - 32
dnl      - 64
dnl
dnl ENDIANNESS: I think you can guess what this thing means :-)
dnl             - LITTLE_ENDIAN
dnl             - BIG_ENDIAN
dnl
dnl ==========================================================================

dnl
dnl Looking what sources have to be compiled according to the CPU type
dnl

ARCHITECTURE=""

AC_MSG_CHECKING([for whether to use assembly code])
if test x"$assembly" = x"yes" ; then
   AC_MSG_RESULT([yes])
   AC_MSG_CHECKING([for architecture type])
   case "$target_cpu" in
	  i[[3456]]86)
	  AC_MSG_RESULT(ia32)
	  	ARCHITECTURE="IA32"
                ;;
          x86_64)
                AC_MSG_RESULT(x86_64)
                ARCHITECTURE="X86_64"
		;;	
		powerpc)
		AC_MSG_RESULT(PowerPC)
		ARCHITECTURE="PPC"
		;;
		ia64)
		AC_MSG_RESULT(ia64)
		ARCHITECTURE="IA64"
		;;
		*)
		AC_MSG_RESULT($target_cpu)
		ARCHITECTURE="GENERIC"
		;;
   esac
else
   AC_MSG_RESULT([no])
   ARCHITECTURE="GENERIC"
fi

dnl
dnl Testing address bus length
dnl
BUS=""

AC_CHECK_SIZEOF([int *])
case "$ac_cv_sizeof_int_p" in
     4)
	BUS="32BIT"
	;;
     8)
	BUS="64BIT"
	;;
     *)
	AC_MSG_ERROR([Xvid supports only 32/64 bit architectures])
	;;
esac

dnl
dnl Testing endianness
dnl
ENDIANNESS=""

AC_C_BIGENDIAN(ENDIANNESS="BIG_ENDIAN", ENDIANNESS="LITTLE_ENDIAN")

dnl ==========================================================================
dnl
dnl Check for OS specific variables
dnl    - SHARED_EXTENSION, STATIC_EXTENSION, OBJECT_EXTENSION
dnl
dnl ==========================================================================

AC_MSG_CHECKING(for build extensions)
SHARED_EXTENSION=""
STATIC_EXTENSION=""
OBJECT_EXTENSION=""
case "$target_os" in
     *bsd*|linux*|beos|irix*|solaris*)
	AC_MSG_RESULT([.so .a .o])
	STATIC_EXTENSION="a"
	SHARED_EXTENSION="so"
	OBJECT_EXTENSION="o"
	;;
     [[cC]][[yY]][[gG]][[wW]][[iI]][[nN]]*|mingw32*|mks*)
	AC_MSG_RESULT([.dll .a .obj])
	STATIC_EXTENSION="a"
	SHARED_EXTENSION="dll"
	OBJECT_EXTENSION="obj"
	;;
     darwin*|raphsody*)
	if test x"$macosx_module" = x"yes"; then
	   AC_MSG_RESULT([.so .a .o])
	   SHARED_EXTENSION="so"
        else
	   AC_MSG_RESULT([.dynlib .a .o])
	   SHARED_EXTENSION="dylib"
	fi
	STATIC_EXTENSION="a"
	OBJECT_EXTENSION="o"
	;;
     *)
        AC_MSG_RESULT([Unknown OS - Using .so .a .o])
	STATIC_EXTENSION="a"
	SHARED_EXTENSION="so"
	OBJECT_EXTENSION="o"
	;;
esac

dnl ==========================================================================
dnl
dnl Determines best options for CC and LD
dnl  - STATIC_LIB, SHARED_LIB, SPECIFIC_CFLAGS, SPECIFIC_LDLAGS
dnl
dnl ==========================================================================

AC_MSG_CHECKING(for platform specific LDFLAGS/CFLAGS)
SPECIFIC_LDFLAGS=""
SPECIFIC_CFLAGS=""
PRE_SHARED_LIB=""
case "$target_os" in
     linux*|solaris*)
	AC_MSG_RESULT([ok])
	STATIC_LIB="libxvidcore.\$(STATIC_EXTENSION)"
	SHARED_LIB="libxvidcore.\$(SHARED_EXTENSION).\$(API_MAJOR).\$(API_MINOR)"
	SPECIFIC_LDFLAGS="-Wl,-soname,libxvidcore.\$(SHARED_EXTENSION).\$(API_MAJOR) -shared -Wl,--version-script=libxvidcore.ld -lc -lm"
	SPECIFIC_CFLAGS="-fPIC"
	;;
     *bsd*|irix*)
	AC_MSG_RESULT([ok])
	STATIC_LIB="libxvidcore.\$(STATIC_EXTENSION)"
	SHARED_LIB="libxvidcore.\$(SHARED_EXTENSION).\$(API_MAJOR).\$(API_MINOR)"
	SPECIFIC_LDFLAGS="-Wl,-soname,libxvidcore.\$(SHARED_EXTENSION).\$(API_MAJOR) -shared -lc -lm"
	SPECIFIC_CFLAGS="-fPIC"
	;;
     [[cC]][[yY]][[gG]][[wW]][[iI]][[nN]]*|mingw32*|mks*)
	AC_MSG_RESULT([ok])
	STATIC_LIB="xvidcore.\$(STATIC_EXTENSION)"
	SHARED_LIB="xvidcore.\$(SHARED_EXTENSION)"
	SPECIFIC_LDFLAGS="-mno-cygwin -shared -Wl,--dll,--out-implib,\$@.a libxvidcore.def"
	SPECIFIC_CFLAGS="-mno-cygwin"
	;;
     darwin*|raphsody*)
	STATIC_LIB="libxvidcore.\$(STATIC_EXTENSION)"
	SPECIFIC_CFLAGS="-fPIC -fno-common -no-cpp-precomp"
	if test x"$macosx_module" = x"no"; then
	   AC_MSG_RESULT([dylib options])
	   SHARED_LIB="libxvidcore.\$(API_MAJOR).\$(SHARED_EXTENSION)"
	   SPECIFIC_LDFLAGS="-dynamiclib -flat_namespace -compatibility_version \$(API_MAJOR) -current_version \$(API_MAJOR).\$(API_MINOR) -install_name \$(libdir)/\$(SHARED_LIB)"
	else 
	   AC_MSG_RESULT([module options])
 	   PRE_SHARED_LIB="libxvidcore.\$(SHARED_EXTENSION)-temp.o"
	   SHARED_LIB="libxvidcore.\$(SHARED_EXTENSION).\$(API_MAJOR)"
	   SPECIFIC_LDFLAGS="-r -keep_private_externs -nostdlib && \$(CC) \$(LDFLAGS) \$(PRE_SHARED_LIB) -o libxvidcore.\$(SHARED_EXTENSION).\$(API_MAJOR) -bundle -flat_namespace -undefined suppress"
	fi
	;;
     beos)
	AC_MSG_RESULT([ok])
	STATIC_LIB="libxvidcore.\$(STATIC_EXTENSION)"
	SHARED_LIB="libxvidcore.\$(SHARED_EXTENSION)"
	SPECIFIC_LDFLAGS="-nostart"
	SPECIFIC_CFLAGS="-fPIC"
	;;
     *)
        AC_MSG_RESULT([Unknown Platform (Using default -shared -lc -lm)])
    STATIC_LIB="libxvidcore.\$(STATIC_EXTENSION)"
	SHARED_LIB="libxvidcore.\$(SHARED_EXTENSION)"
	SPECIFIC_LDFLAGS=""
	SPECIFIC_CFLAGS=""
	;;
esac

if test x"$PRE_SHARED_LIB" = x; then 
  PRE_SHARED_LIB=$SHARED_LIB
fi

dnl ==========================================================================
dnl
dnl Assembler stuff
dnl  - AS, AFLAGS, ASSEMBLY_EXTENSION, SOURCES
dnl
dnl ==========================================================================

AS=""
AFLAGS=""
ASSEMBLY_EXTENSION=""
GENERIC_SOURCES="SRC_GENERIC"
ASSEMBLY_SOURCES=""

dnl
dnl IA32
dnl

if test "$ARCHITECTURE" = "IA32" -o "$ARCHITECTURE" = "X86_64" ; then

   dnl
   dnl Checking for nasm compatible programs
   dnl

   found_nasm_comp_prog="no"
   chosen_asm_prog=""

   dnl Check for nasm (not buggy version)
   if test "$found_nasm_comp_prog" = "no" ; then
       AC_CHECK_PROG([ac_nasm], [$nasm_prog], [yes], [no], , [yes])
       if test "$ac_nasm" = "yes" ; then
           dnl
           dnl Checking nasm version
           dnl
           AC_MSG_CHECKING([for nasm version])
           nasm_minor=`$nasm_prog -v | cut -d '.' -f 2 | cut -d ' ' -f 1`
           nasm_major=`$nasm_prog -v | cut -d '.' -f 1 | cut -d ' ' -f 3`
           if test -z $nasm_minor ; then
              nasm_minor=-1
           fi
           if test -z $nasm_major ; then
              nasm_major=-1
           fi
           AC_MSG_RESULT([$nasm_major])

           dnl need nasm 2.x for SSE3/4 and X86_64
           if test "$nasm_major" -lt "$minimum_nasm_major_version" ; then
             AC_MSG_WARN([nasm version is too old])
           else
             found_nasm_comp_prog="yes"
	       chosen_asm_prog="$nasm_prog"
           fi
       fi
   fi

   dnl
   dnl Ok now sort what object format we must use
   dnl
   if test "$found_nasm_comp_prog" = "yes" ; then
       AC_MSG_CHECKING([for asm object format])
       case "$target_os" in
           *bsd*|linux*|beos|irix*|solaris*)
               if test "$ARCHITECTURE" = "X86_64" ; then
                   AC_MSG_RESULT([elf64])
                   NASM_FORMAT="elf64"
               else
                   AC_MSG_RESULT([elf])
                   NASM_FORMAT="elf"
               fi
	       MARK_FUNCS="-DMARK_FUNCS"
	           PREFIX=""
               ;;
           [[cC]][[yY]][[gG]][[wW]][[iI]][[nN]]*|mingw32*|mks*)
               if test "$ARCHITECTURE" = "X86_64" ; then
                   AC_MSG_RESULT([win64])
                   NASM_FORMAT="win64"
               else
                   AC_MSG_RESULT([win32])
                   NASM_FORMAT="win32"
               fi
	       PREFIX="-DWINDOWS"
	       MARK_FUNCS=""
               ;;
           *darwin*)
               AC_MSG_RESULT([macho])
               NASM_FORMAT="macho"
               PREFIX="-DPREFIX"
               MARK_FUNCS=""
               ;;
       esac

       AS="$chosen_asm_prog"
       ASSEMBLY_EXTENSION="asm"
       AFLAGS="-I\$(<D)/ -I../../src/ -f $NASM_FORMAT $PREFIX $MARK_FUNCS"
       ASSEMBLY_SOURCES="SRC_${ARCHITECTURE}"
       if test "$ARCHITECTURE" = "X86_64" ; then
               AFLAGS=${AFLAGS}" -DARCH_IS_X86_64"
       fi
   else 
       AC_MSG_WARN([no correct assembler was found - Compiling generic sources only])
       ARCHITECTURE="GENERIC"
   fi
fi

dnl
dnl PPC
dnl
dnl With the PPC platform we do not use assembly language, we better keep with
dnl intrinsic altivec functions and types as they are supported by both Apple
dnl and GNU gcc with very slight changes to code which can be sumed up by:
dnl
dnl Apple:
dnl  - compile with the option -faltivec
dnl  - define vectors with parentheses vec = (0,0,0,0)
dnl GNU
dnl  - compile with -maltivec -mabi=altivec
dnl  - include <altivec.h> before using intrincic
dnl  - define vectors with vec = {0,0,0,0}
dnl
dnl * The compile time option will be "injected" into SPECIFIC_CFLAGS variable
dnl * The need for altivec.h will also be injected into SPECIFIC_CFLAGS through
dnl   a -DHAVE_ALTIVEC_H
dnl * The vector definition is handled in portab.h thx to
dnl   HAVE_PARENTHESES/BRACES_ALTIVEC_DECL
dnl
PPC_ALTIVEC_SOURCES=""
if test "$ARCHITECTURE" = "PPC" ; then
   AS="\$(CC)"
   AFLAGS=""
   ASSEMBLY_EXTENSION=".s"
   ASSEMBLY_SOURCES=""

   AC_MSG_CHECKING([for altivec.h])
cat > conftest.c << EOF
#include <altivec.h>
int main() { return(0); }
EOF
   if $CC -faltivec -c conftest.c 2>/dev/null 1>/dev/null || \
      $CC -maltivec -mabi=altivec -c conftest.c 2>/dev/null 1>/dev/null ; then
        AC_MSG_RESULT(yes)
        SPECIFIC_CFLAGS="$SPECIFIC_CFLAGS -DHAVE_ALTIVEC_H"
	TEMP_ALTIVEC="-DHAVE_ALTIVEC_H"
   else
        AC_MSG_RESULT(no)
	TEMP_ALTIVEC=""
   fi

   AC_MSG_CHECKING([for Altivec compiler support])
cat > conftest.c << EOF
#ifdef HAVE_ALTIVEC_H
#include <altivec.h>
#endif

int main()
{
  vector unsigned int vartest2 = (vector unsigned int)(0);
  vector unsigned int vartest3 = (vector unsigned int)(1);
  vartest2 = vec_add(vartest2, vartest3);
  return(0);
}
EOF
   if $CC $TEMP_ALTIVEC -faltivec -c conftest.c 2>/dev/null 1>/dev/null ; then
        AC_MSG_RESULT([yes (Apple)])
        SPECIFIC_CFLAGS="$SPECIFIC_CFLAGS -faltivec -DHAVE_ALTIVEC_PARENTHESES_DECL $TEMP_ALTIVEC"
	PPC_ALTIVEC_SOURCES="SRC_PPC_ALTIVEC"
   else
cat > conftest.c << EOF
#ifdef HAVE_ALTIVEC_H
#include <altivec.h>
#endif

int main()
{
  vector unsigned int vartest2 = (vector unsigned int){0};
  vector unsigned int vartest3 = (vector unsigned int){1};
  vartest2 = vec_add(vartest2, vartest3);
  return(0);
}
EOF
   if $CC $TEMP_ALTIVEC -maltivec -mabi=altivec -c conftest.c 2>/dev/null 1>/dev/null ; then
        AC_MSG_RESULT([yes (GNU)])
        SPECIFIC_CFLAGS="$SPECIFIC_CFLAGS -maltivec -mabi=altivec -DHAVE_ALTIVEC_BRACES_DECL $TEMP_ALTIVEC"
	PPC_ALTIVEC_SOURCES="SRC_PPC_ALTIVEC"
   else
	AC_MSG_RESULT([no (ppc support won't be compiled in)])
	dnl Only C code can be compiled :-(
	ARCHITECTURE="GENERIC"
   fi
   fi

   rm -f conftest.*
fi

dnl
dnl IA64
dnl

if test "$ARCHITECTURE" = "IA64" ; then
   AS="\$(CC)"
   AFLAGS="-c"
   ASSEMBLY_EXTENSION="s"
   ASSEMBLY_SOURCES="SRC_IA64"

   case `basename $CC` in
	*ecc*)
		DCT_IA64_SOURCES="SRC_IA64_IDCT_ECC"

		dnl If the compiler is ecc, then i don't know its options
		dnl fallback to "no options"
		if test "$force_default_cc_options" = "yes" ; then
		   our_cflags_defaults=""
		fi
		;;
	*)
		DCT_IA64_SOURCES="SRC_IA64_IDCT_GCC"
		;;
   esac

fi

dnl ==========================================================================
dnl
dnl Check for header files
dnl
dnl ==========================================================================

AC_CHECK_HEADERS(
	stdio.h \
	signal.h \
	stdlib.h \
	string.h \
	assert.h \
	math.h \
	, , AC_MSG_ERROR(Missing header file))

dnl ==========================================================================
dnl
dnl Check for pthread
dnl
dnl ==========================================================================

AC_CHECK_HEADER(
	pthread.h,
	AC_CHECK_LIB(
		pthread,
		pthread_create,
		AC_CHECK_LIB(
			pthread,
			pthread_join,
			SPECIFIC_CFLAGS="$SPECIFIC_CFLAGS -DHAVE_PTHREAD"
			SPECIFIC_LDFLAGS="$SPECIFIC_LDFLAGS -lpthread",
			AC_MSG_WARN(Pthread not supported. No SMP support)),
		AC_MSG_WARN(Pthread not supported. No SMP support)),
	AC_MSG_WARN(Pthread not supported. No SMP support))

dnl ==========================================================================
dnl 
dnl Now we can set CFLAGS if needed
dnl
dnl ==========================================================================

if test "$force_default_cc_options" = "yes" ; then
   CFLAGS="$our_cflags_defaults"
fi

dnl ==========================================================================
dnl
dnl Profiling stuff goes here
dnl  - adds options to SPECIFIC_CFLAGS, SPECIFIC_LDLAGS
dnl  - removes incompatible options from CFLAGS
dnl
dnl ==========================================================================

SPECIFIC_LDFLAGS="$SPECIFIC_LDFLAGS $GNU_PROF_LDFLAGS"
SPECIFIC_CFLAGS="$SPECIFIC_CFLAGS $GNU_PROF_CFLAGS"

if test "$enable_gnuprofile" = "yes" ; then
   CFLAGS=`echo $CFLAGS | sed s/'-fomit-frame-pointer'/''/`
fi

dnl ==========================================================================
dnl Some gcc flags can't be used for gcc >= 3.4.0 
dnl ==========================================================================

if test "$GCC" = "yes" ; then
cat << EOF > test.c
#include <stdio.h>
int main(int argc, char **argv)
{
	if (*argv[[1]] == 'M') {
		printf("%d", __GNUC__);
	}
	if (*argv[[1]] == 'm') {
		printf("%d", __GNUC_MINOR__);
	}
	return 0;
}
EOF
	$CC -o gcc-ver test.c
	
	GCC_MAJOR=`./gcc-ver M`
	GCC_MINOR=`./gcc-ver m`

	rm -f test.c
	rm -f gcc-ver

	# GCC 4.x
	if test "${GCC_MAJOR}" -gt 3 ; then
		CFLAGS=`echo $CFLAGS | sed s,"-mcpu","-mtune",g`
		CFLAGS=`echo $CFLAGS | sed s,'-freduce-all-givs','',g`
		CFLAGS=`echo $CFLAGS | sed s,'-fmove-all-movables','',g`
		CFLAGS=`echo $CFLAGS | sed s,'-fnew-ra','',g`
		CFLAGS=`echo $CFLAGS | sed s,'-fwritable-strings','',g`
	fi

	# GCC 3.4.x
	if test "${GCC_MAJOR}" -eq 3 && test "${GCC_MINOR}" -gt 3 ; then
		CFLAGS=`echo $CFLAGS | sed s,"-mcpu","-mtune",g`
	fi
fi


dnl ==========================================================================
dnl
dnl Substitions
dnl
dnl ==========================================================================

AC_SUBST(FEATURES)
AC_SUBST(ARCHITECTURE)
AC_SUBST(BUS)
AC_SUBST(ENDIANNESS)
AC_SUBST(SHARED_EXTENSION)
AC_SUBST(STATIC_EXTENSION)
AC_SUBST(OBJECT_EXTENSION)
AC_SUBST(NASM_FORMAT)
AC_SUBST(AS)
AC_SUBST(AFLAGS)
AC_SUBST(ASSEMBLY_EXTENSION)
AC_SUBST(GENERIC_SOURCES)
AC_SUBST(ASSEMBLY_SOURCES)
AC_SUBST(CC)
AC_SUBST(CFLAGS)
AC_SUBST(SPECIFIC_LDFLAGS)
AC_SUBST(SPECIFIC_CFLAGS)
AC_SUBST(DCT_IA64_SOURCES)
AC_SUBST(PPC_ALTIVEC_SOURCES)
AC_SUBST(RANLIB)
AC_SUBST(API_MAJOR)
AC_SUBST(API_MINOR)
AC_SUBST(STATIC_LIB)
AC_SUBST(PRE_SHARED_LIB)
AC_SUBST(SHARED_LIB)

dnl ==========================================================================
dnl
dnl Output files
dnl
dnl ==========================================================================

AC_CONFIG_FILES(platform.inc)

AC_OUTPUT