cnq3/code/libjpeg-turbo/acinclude.m4

# AC_PROG_NASM
# --------------------------
# Check that NASM exists and determine flags
AC_DEFUN([AC_PROG_NASM],[

AC_ARG_VAR(NASM, [NASM command (used to build the x86/x86-64 SIMD code)])
if test "x$NASM" = "x"; then
  AC_CHECK_PROGS(NASM, [nasm nasmw yasm])
  test -z "$NASM" && AC_MSG_ERROR([no nasm (Netwide Assembler) found])
fi

AC_MSG_CHECKING([for object file format of host system])
case "$host_os" in
  cygwin* | mingw* | pw32* | interix*)
    case "$host_cpu" in
      x86_64)
        objfmt='Win64-COFF'
        ;;
      *)
        objfmt='Win32-COFF'
        ;;
    esac
  ;;
  msdosdjgpp* | go32*)
    objfmt='COFF'
  ;;
  os2-emx*)			# not tested
    objfmt='MSOMF'		# obj
  ;;
  linux*coff* | linux*oldld*)
    objfmt='COFF'		# ???
  ;;
  linux*aout*)
    objfmt='a.out'
  ;;
  linux*)
    case "$host_cpu" in
      x86_64)
        objfmt='ELF64'
        ;;
      *)
        objfmt='ELF'
        ;;
    esac
  ;;
  kfreebsd* | freebsd* | netbsd* | openbsd*)
    if echo __ELF__ | $CC -E - | grep __ELF__ > /dev/null; then
      objfmt='BSD-a.out'
    else
      case "$host_cpu" in
        x86_64 | amd64)
          objfmt='ELF64'
          ;;
        *)
          objfmt='ELF'
          ;;
      esac
    fi
  ;;
  solaris* | sunos* | sysv* | sco*)
    case "$host_cpu" in
      x86_64)
        objfmt='ELF64'
        ;;
      *)
        objfmt='ELF'
        ;;
    esac
  ;;
  darwin* | rhapsody* | nextstep* | openstep* | macos*)
    case "$host_cpu" in
      x86_64)
        objfmt='Mach-O64'
        ;;
      *)
        objfmt='Mach-O'
        ;;
    esac
  ;;
  *)
    objfmt='ELF ?'
  ;;
esac

AC_MSG_RESULT([$objfmt])
if test "$objfmt" = 'ELF ?'; then
  objfmt='ELF'
  AC_MSG_WARN([unexpected host system. assumed that the format is $objfmt.])
fi

AC_MSG_CHECKING([for object file format specifier (NAFLAGS) ])
case "$objfmt" in
  MSOMF)      NAFLAGS='-fobj -DOBJ32';;
  Win32-COFF) NAFLAGS='-fwin32 -DWIN32';;
  Win64-COFF) NAFLAGS='-fwin64 -DWIN64 -D__x86_64__';;
  COFF)       NAFLAGS='-fcoff -DCOFF';;
  a.out)      NAFLAGS='-faout -DAOUT';;
  BSD-a.out)  NAFLAGS='-faoutb -DAOUT';;
  ELF)        NAFLAGS='-felf -DELF';;
  ELF64)      NAFLAGS='-felf64 -DELF -D__x86_64__';;
  RDF)        NAFLAGS='-frdf -DRDF';;
  Mach-O)     NAFLAGS='-fmacho -DMACHO';;
  Mach-O64)   NAFLAGS='-fmacho64 -DMACHO -D__x86_64__';;
esac
AC_MSG_RESULT([$NAFLAGS])
AC_SUBST([NAFLAGS])

AC_MSG_CHECKING([whether the assembler ($NASM $NAFLAGS) works])
cat > conftest.asm <<EOF
[%line __oline__ "configure"
        section .text
        global  _main,main
_main:
main:   xor     eax,eax
        ret
]EOF
try_nasm='$NASM $NAFLAGS -o conftest.o conftest.asm'
if AC_TRY_EVAL(try_nasm) && test -s conftest.o; then
  AC_MSG_RESULT(yes)
else
  echo "configure: failed program was:" >&AC_FD_CC
  cat conftest.asm >&AC_FD_CC
  rm -rf conftest*
  AC_MSG_RESULT(no)
  AC_MSG_ERROR([installation or configuration problem: assembler cannot create object files.])
fi

AC_MSG_CHECKING([whether the linker accepts assembler output])
try_nasm='${CC-cc} -o conftest${ac_exeext} $LDFLAGS conftest.o $LIBS 1>&AC_FD_CC'
if AC_TRY_EVAL(try_nasm) && test -s conftest${ac_exeext}; then
  rm -rf conftest*
  AC_MSG_RESULT(yes)
else
  rm -rf conftest*
  AC_MSG_RESULT(no)
  AC_MSG_ERROR([configuration problem: maybe object file format mismatch.])
fi

])

# AC_CHECK_COMPATIBLE_ARM_ASSEMBLER_IFELSE
# --------------------------
# Test whether the assembler is suitable and supports NEON instructions
AC_DEFUN([AC_CHECK_COMPATIBLE_ARM_ASSEMBLER_IFELSE],[
  ac_good_gnu_arm_assembler=no
  ac_save_CC="$CC"
  ac_save_CFLAGS="$CFLAGS"
  CFLAGS="$CCASFLAGS -x assembler-with-cpp"
  CC="$CCAS"
  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
    .text
    .fpu neon
    .arch armv7a
    .object_arch armv4
    .arm
    pld [r0]
    vmovn.u16 d0, q0]])], ac_good_gnu_arm_assembler=yes)

  ac_use_gas_preprocessor=no
  if test "x$ac_good_gnu_arm_assembler" = "xno" ; then
    CC="gas-preprocessor.pl $CCAS"
    AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
      .text
      .fpu neon
      .arch armv7a
      .object_arch armv4
      .arm
      pld [r0]
      vmovn.u16 d0, q0]])], ac_use_gas_preprocessor=yes)
  fi
  CFLAGS="$ac_save_CFLAGS"
  CC="$ac_save_CC"

  if test "x$ac_use_gas_preprocessor" = "xyes" ; then
    CCAS="gas-preprocessor.pl $CCAS"
    AC_SUBST([CCAS])
    ac_good_gnu_arm_assembler=yes
  fi

  if test "x$ac_good_gnu_arm_assembler" = "xyes" ; then
    $1
  else
    $2
  fi
])

# AC_CHECK_COMPATIBLE_MIPSEL_ASSEMBLER_IFELSE
# --------------------------
# Test whether the assembler is suitable and supports MIPS instructions
AC_DEFUN([AC_CHECK_COMPATIBLE_MIPS_ASSEMBLER_IFELSE],[
  have_mips_dspr2=no
  ac_save_CFLAGS="$CFLAGS"
  CFLAGS="$CCASFLAGS -mdspr2"

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[

  int main ()
  {
    int c = 0, a = 0, b = 0;
    __asm__ __volatile__ (
        "precr.qb.ph %[c], %[a], %[b]          \n\t"
        : [c] "=r" (c)
        : [a] "r" (a), [b] "r" (b)
    );
    return c;
  }
  ]])], have_mips_dspr2=yes)
  CFLAGS=$ac_save_CFLAGS

  if test "x$have_mips_dspr2" = "xyes" ; then
    $1
  else
    $2
  fi
])

AC_DEFUN([AC_CHECK_COMPATIBLE_ARM64_ASSEMBLER_IFELSE],[
  ac_good_gnu_arm_assembler=no
  ac_save_CC="$CC"
  ac_save_CFLAGS="$CFLAGS"
  CFLAGS="$CCASFLAGS -x assembler-with-cpp"
  CC="$CCAS"
  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
    .text
    MYVAR .req x0
    movi v0.16b, #100
    mov MYVAR, #100
    .unreq MYVAR]])], ac_good_gnu_arm_assembler=yes)

  ac_use_gas_preprocessor=no
  if test "x$ac_good_gnu_arm_assembler" = "xno" ; then
    CC="gas-preprocessor.pl $CCAS"
    AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
      .text
      MYVAR .req x0
      movi v0.16b, #100
      mov MYVAR, #100
      .unreq MYVAR]])], ac_use_gas_preprocessor=yes)
  fi
  CFLAGS="$ac_save_CFLAGS"
  CC="$ac_save_CC"

  if test "x$ac_use_gas_preprocessor" = "xyes" ; then
    CCAS="gas-preprocessor.pl $CCAS"
    AC_SUBST([CCAS])
    ac_good_gnu_arm_assembler=yes
  fi

  if test "x$ac_good_gnu_arm_assembler" = "xyes" ; then
    $1
  else
    $2
  fi
])