kc3-lang/libjpeg-turbo/acinclude.m4

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• Hash : 5f972324
  Author :
  Date : 2016-02-19T13:16:56
  

  Build: Make the NASM autoconf variable persistent
  
  Previously, if a custom value of this variable was specified when
  running configure, then that value would be lost if configure was
  automatically re-run (as a result of changes to configure.ac, for
  instance.)
  
  As a bonus, the NASM variable is now also listed when running
  'configure --help', so it is obvious how to override the default
  NASM command.
  

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• 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
  ])
  

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