configure.in

mpeg4代码,比较具体

dnl ==========================================================================
dnl
dnl Autoconf script for XviD
dnl
dnl Copyright(C) 2003 Edouard Gomez <[e-mail]>
dnl
dnl ==========================================================================

AC_INIT([XviD], [0.9.2], [[e-mail]])
AC_CONFIG_SRCDIR(configure.in)

dnl Do not forget to increase that when needed.
API_MAJOR="2"
API_MINOR="1"

dnl NASM version requirement
minimum_nasm_patch_version=34
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 -fomit-frame-pointer"
our_cflags_defaults="$our_cflags_defaults -ffast-math"
our_cflags_defaults="$our_cflags_defaults -funroll-loops"
our_cflags_defaults="$our_cflags_defaults -fschedule-insns"
our_cflags_defaults="$our_cflags_defaults -fschedule-insns2"

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

FEATURES=""
DIVX4COMPAT_SOURCES=""
DIVX4_ENCORE=""
DIVX4_DECORE=""

dnl BIGLUT aka old VLC code
AC_ARG_ENABLE(oldvlc,
		AC_HELP_STRING([--enable-oldvlc],
				 [Enable old VLC code (Needs much more memory ~10MB)]),
		[if test "$enable_oldvlc" = "yes" ; then
		    FEATURES="$FEATURES -DBIGLUT"
		 fi])

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 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])

dnl Internal Debug
AC_ARG_ENABLE(divx4compat,
		AC_HELP_STRING([--enable-divx4compat],
				 [Enable DivX4 compatibility API]),
		 [if test "$enable_divx4compat" = "yes" ; then
		     DIVX4COMPAT_SOURCES="SRC_DIVX4COMPAT"
		     DIVX4_ENCORE="encore;"
		     DIVX4_DECORE="decore;"
		  fi])


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"
		;;	
		powerpc)
		AC_MSG_RESULT(PowerPC)
		dnl ATM the ppc port is out of date 
		dnl ARCHITECTURE="PPC"
		ARCHITECTURE="GENERIC"
		;;
		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

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

dnl ==========================================================================
dnl
dnl Assembler stuff - 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" ; then

   dnl
   dnl Checking nasm existence
   dnl
   AC_CHECK_PROG([ac_nasm], [$nasm_prog], [yes], [no], , [yes])
   if test "$ac_nasm" = "yes" ; then

      dnl
      dnl Checking nasm patch version
      dnl
      AC_MSG_CHECKING([for nasm patch version])
      nasm_patch=`nasm -r | cut -d '.' -f 3 | cut -d ' ' -f 1`
      AC_MSG_RESULT([$nasm_patch])

      if test "$nasm_patch" -lt "$minimum_nasm_patch_version" ; then
        AC_MSG_WARN([nasm patch version too old - Compiling generic sources only])
	ARCHITECTURE="GENERIC"
      else

         dnl
         dnl Checking nasm format - win32 or elf
         dnl
         AC_MSG_CHECKING([for nasm object format])
         case "$target_os" in
              *bsd*|linux*|beos|irix*|solaris*)
                  AC_MSG_RESULT([elf])
                  NASM_FORMAT="elf"
		  PREFIX=""
                  ;;
              [[cC]][[yY]][[gG]][[wW]][[iI]][[nN]]|mingw32|mks)
                  AC_MSG_RESULT([win32])
                  NASM_FORMAT="win32"
		  PREFIX="-DPREFIX"
                  ;;
          esac

          AS=nasm
          AFLAGS="-I\$(<D) -f $NASM_FORMAT $PREFIX"
          ASSEMBLY_EXTENSION="asm"
          ASSEMBLY_SOURCES="SRC_IA32"
       fi

   else
	AC_MSG_WARN([nasm not found - Compiling generic sources only])
	ARCHITECTURE="GENERIC"
   fi

fi

dnl
dnl PPC
dnl

if test "$ARCHITECTURE" = "PPC" ; then
   AS="\$(CC)"
   AFLAGS="-c"
   ASSEMBLY_EXTENSION="s"
   ASSEMBLY_SOURCES="SRC_PPC"
   AC_MSG_CHECKING([for Altivec support])
   cat > conftest.S << EOF
         .text
         vxor 0,0,0
EOF
   if $CC -c conftest.S 2>/dev/null 1>/dev/null ; then
        AC_MSG_RESULT(yes)
        SPECIFIC_CFLAGS="$SPECIFIC_CFLAGS -DARCH_IS_PPC_ALTIVEC"
        ASSEMBLY_SOURCES="SRC_ALTIVEC"
   else
        AC_MSG_RESULT(no)
   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="idct_ia64_ecc.s"

		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="idct_ia64_gcc.s"
		;;
   esac

fi

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

AC_CHECK_HEADERS(
	stdio.h \
	signal.h \
	, , AC_MSG_ERROR(Missing header file))

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 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(DIVX4COMPAT_SOURCES)
AC_SUBST(DCT_IA64_SOURCES)
AC_SUBST(DIVX4_ENCORE)
AC_SUBST(DIVX4_DECORE)
AC_SUBST(RANLIB)
AC_SUBST(API_MAJOR)
AC_SUBST(API_MINOR)
AC_SUBST(STATIC_LIB)
AC_SUBST(SHARED_LIB)

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

AC_CONFIG_FILES(platform.inc)
AC_CONFIG_FILES(libxvidcore.def)

AC_OUTPUT