dnl Process this file with autoconf to produce a configure script.
AC_INIT(viterbi27.c)
AC_CONFIG_HEADER(config.h)
SO_NAME=2
VERSION=2.0.1
AC_SUBST(SO_NAME)
AC_SUBST(VERSION)

dnl Checks for programs.
AC_PROG_CC
if test $GCC != "yes"
then
	AC_MSG_ERROR([Need GNU C compiler])
fi
dnl Checks for libraries.
AC_CHECK_LIB(c, malloc)

dnl Checks for header files.
AC_CHECK_HEADERS(getopt.h stdio.h stdlib.h memory.h)
if test -z "$HAVE_stdio.h"
then
	AC_MSG_ERROR([Need stdio.h!])
fi
if test -z "$HAVE_stdlib.h"
then
	AC_MSG_ERROR([Need stdlib.h!])
fi
if test -z "$HAVE_stdlib.h"
then
	AC_MSG_ERROR([Need memory.h!])
fi

AC_CANONICAL_SYSTEM
case $target_cpu in
i386|i486|i586|i686)
	ARCH_OPTION=-march=$target_cpu
	;;
esac

AC_SUBST(ARCH_OPTION)

SIMD=no

AC_ARG_ENABLE(port,[  --enable-port           force use of portable C code],SIMD="port")
AC_ARG_ENABLE(mmx,[  --enable-mmx            force use of MMX instructions],SIMD="MMX")
AC_ARG_ENABLE(sse,[  --enable-sse            force use of SSE instructions],SIMD="SSE")
AC_ARG_ENABLE(sse2,[  --enable sse2           force use of SSE2 instructions],SIMD="SSE2")

# If not specified, find out which versions of the library (port/mmx/sse/sse2) to install as the default
# by looking at the CPUID flags

if test $SIMD = no; then

if test $cross_compiling = yes; then
   AC_MSG_ERROR([Must specify --with-port, --with-mmx, --with-sse or --with-sse2 when cross-compiling])
fi

AC_MSG_CHECKING([for SSE2 support...])
AC_TRY_RUN([
int main(){
  int f;

  asm("movl \$1,%%eax;cpuid;movl %%edx,%0" : "=r"(f) : : "%eax","%ebx","%ecx");

  if(f & (1 << 26))
    exit(0);
  else 
    exit(1);
}],SIMD="SSE2";
   AC_MSG_RESULT([yes]),
   AC_MSG_RESULT([no]))
fi

if test $SIMD = no; then
AC_MSG_CHECKING([for SSE support...])
AC_TRY_RUN([
int main(){
  int f;

  asm("movl \$1,%%eax;cpuid;movl %%edx,%0" : "=r"(f) : : "%eax","%ebx","%ecx");

  if(f & (1 << 25))
    exit(0);
  else 
    exit(1);
}],SIMD="SSE";
   AC_MSG_RESULT([yes]),
   AC_MSG_RESULT([no]))
fi

if test $SIMD = no; then
AC_MSG_CHECKING([for MMX support...])
AC_TRY_RUN([
int main(){
  int f;

  asm("movl \$1,%%eax;cpuid;movl %%edx,%0" : "=r"(f) : : "%eax","%ebx","%ecx");

  if(f & (1 << 23))
    exit(0);
  else 
    exit(1);
}],SIMD="MMX";
   AC_MSG_RESULT([yes]),
   AC_MSG_RESULT([no]))
fi

case $SIMD in
SSE2)
	AC_MSG_RESULT([Building SSE2 version])
	AC_TRY_COMPILE(,[asm("movdqa %xmm0,%xmm0"); ],,
	 AC_MSG_ERROR([You have a SSE2 CPU but your assembler does not support SSE2 mnemonics.
	  Install the latest version of bintools or restart configure with the --enable-sse option]))
	STATIC_LIB=libviterbi_sse2.a

	;;
SSE)
	AC_MSG_RESULT([Building SSE version])
	STATIC_LIB=libviterbi_sse.a
	;;
MMX)
	AC_MSG_RESULT([Building MMX version])
	STATIC_LIB=libviterbi_mmx.a
	;;
port|no)
	AC_MSG_RESULT([Building portable C version])
	STATIC_LIB=libviterbi_port.a
	;;
esac


AC_SUBST(STATIC_LIB)

dnl Checks for library functions.
AC_CHECK_FUNCS(getopt_long)

AC_OUTPUT(makefile)