acspecific.m4

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dnl ### Checks for compiler characteristics


AC_DEFUN(AC_C_CROSS,
[AC_OBSOLETE([$0], [; it has been merged into AC_PROG_CC])])

AC_DEFUN(AC_C_CHAR_UNSIGNED,
[AC_CACHE_CHECK(whether char is unsigned, ac_cv_c_char_unsigned,
[if test "$GCC" = yes; then
  # GCC predefines this symbol on systems where it applies.
AC_EGREP_CPP(yes,
[#ifdef __CHAR_UNSIGNED__
  yes
#endif
], ac_cv_c_char_unsigned=yes, ac_cv_c_char_unsigned=no)
else
AC_TRY_RUN(
[/* volatile prevents gcc2 from optimizing the test away on sparcs.  */
#if !defined(__STDC__) || __STDC__ != 1
#define volatile
#endif
main() {
  volatile char c = 255; exit(c < 0);
}], ac_cv_c_char_unsigned=yes, ac_cv_c_char_unsigned=no)
fi])
if test $ac_cv_c_char_unsigned = yes && test "$GCC" != yes; then
  AC_DEFINE(__CHAR_UNSIGNED__)
fi
])

AC_DEFUN(AC_C_LONG_DOUBLE,
[AC_CACHE_CHECK(for long double, ac_cv_c_long_double,
[if test "$GCC" = yes; then
  ac_cv_c_long_double=yes
else
AC_TRY_RUN([int main() {
/* The Stardent Vistra knows sizeof(long double), but does not support it.  */
long double foo = 0.0;
/* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
exit(sizeof(long double) < sizeof(double)); }],
ac_cv_c_long_double=yes, ac_cv_c_long_double=no)
fi])
if test $ac_cv_c_long_double = yes; then
  AC_DEFINE(HAVE_LONG_DOUBLE)
fi
])

AC_DEFUN(AC_INT_16_BITS,
[AC_OBSOLETE([$0], [; instead use AC_CHECK_SIZEOF(int)])dnl
AC_MSG_CHECKING(whether int is 16 bits)
AC_TRY_RUN([main() { exit(sizeof(int) != 2); }],
 [AC_MSG_RESULT(yes)
 AC_DEFINE(INT_16_BITS)], AC_MSG_RESULT(no))
])

AC_DEFUN(AC_LONG_64_BITS,
[AC_OBSOLETE([$0], [; instead use AC_CHECK_SIZEOF(long)])dnl
AC_MSG_CHECKING(whether long int is 64 bits)
AC_TRY_RUN([main() { exit(sizeof(long int) != 8); }],
 [AC_MSG_RESULT(yes)
 AC_DEFINE(LONG_64_BITS)], AC_MSG_RESULT(no))
])

AC_DEFUN(AC_C_BIGENDIAN,
[AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,
[ac_cv_c_bigendian=unknown
# See if sys/param.h defines the BYTE_ORDER macro.
AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/param.h>], [
#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
 bogus endian macros
#endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/param.h>], [
#if BYTE_ORDER != BIG_ENDIAN
 not big endian
#endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
if test $ac_cv_c_bigendian = unknown; then
AC_TRY_RUN([main () {
  /* Are we little or big endian?  From Harbison&Steele.  */
  union
  {
    long l;
    char c[sizeof (long)];
  } u;
  u.l = 1;
  exit (u.c[sizeof (long) - 1] == 1);
}], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes)
fi])
if test $ac_cv_c_bigendian = yes; then
  AC_DEFINE(WORDS_BIGENDIAN)
fi
])

dnl Do nothing if the compiler accepts the inline keyword.
dnl Otherwise define inline to __inline__ or __inline if one of those work,
dnl otherwise define inline to be empty.
AC_DEFUN(AC_C_INLINE,
[AC_CACHE_CHECK([for inline], ac_cv_c_inline,
[ac_cv_c_inline=no
for ac_kw in inline __inline__ __inline; do
  AC_TRY_COMPILE(, [} $ac_kw foo() {], [ac_cv_c_inline=$ac_kw; break])
done
])
case "$ac_cv_c_inline" in
  inline | yes) ;;
  no) AC_DEFINE(inline, ) ;;
  *)  AC_DEFINE_UNQUOTED(inline, $ac_cv_c_inline) ;;
esac
])

AC_DEFUN(AC_C_CONST,
[dnl This message is consistent in form with the other checking messages,
dnl and with the result message.
AC_CACHE_CHECK([for working const], ac_cv_c_const,
[AC_TRY_COMPILE(,
changequote(<<, >>)dnl
<<
/* Ultrix mips cc rejects this.  */
typedef int charset[2]; const charset x;
/* SunOS 4.1.1 cc rejects this.  */
char const *const *ccp;
char **p;
/* NEC SVR4.0.2 mips cc rejects this.  */
struct point {int x, y;};
static struct point const zero = {0,0};
/* AIX XL C 1.02.0.0 rejects this.
   It does not let you subtract one const X* pointer from another in an arm
   of an if-expression whose if-part is not a constant expression */
const char *g = "string";
ccp = &g + (g ? g-g : 0);
/* HPUX 7.0 cc rejects these. */
++ccp;
p = (char**) ccp;
ccp = (char const *const *) p;
{ /* SCO 3.2v4 cc rejects this.  */
  char *t;
  char const *s = 0 ? (char *) 0 : (char const *) 0;

  *t++ = 0;
}
{ /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
  int x[] = {25, 17};
  const int *foo = &x[0];
  ++foo;
}
{ /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
  typedef const int *iptr;
  iptr p = 0;
  ++p;
}
{ /* AIX XL C 1.02.0.0 rejects this saying
     "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
  struct s { int j; const int *ap[3]; };
  struct s *b; b->j = 5;
}
{ /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
  const int foo = 10;
}
>>,
changequote([, ])dnl
ac_cv_c_const=yes, ac_cv_c_const=no)])
if test $ac_cv_c_const = no; then
  AC_DEFINE(const, )
fi
])

AC_DEFUN(AC_C_STRINGIZE, [
AC_REQUIRE([AC_PROG_CPP])
AC_MSG_CHECKING([for preprocessor stringizing operator])
AC_CACHE_VAL(ac_cv_c_stringize,
AC_EGREP_CPP([#teststring],[
#define x(y) #y

char *s = x(teststring);
], ac_cv_c_stringize=no, ac_cv_c_stringize=yes))
if test "${ac_cv_c_stringize}" = yes
then
        AC_DEFINE(HAVE_STRINGIZE)
fi
AC_MSG_RESULT([${ac_cv_c_stringize}])
])dnl

define(AC_ARG_ARRAY,
[errprint(__file__:__line__: [$0] has been removed; don't do unportable things with arguments
)m4exit(4)])

dnl Check the object extension used by the compiler: typically .o or
dnl .obj.  If this is called, some other behaviour will change,
dnl determined by ac_objext.
AC_DEFUN(AC_OBJEXT,
[AC_MSG_CHECKING([for object suffix])
AC_CACHE_VAL(ac_cv_objext,
[rm -f conftest*
echo 'int i = 1;' > conftest.$ac_ext
if AC_TRY_EVAL(ac_compile); then
  for ac_file in conftest.*; do
    case $ac_file in
    *.c) ;;
    *) ac_cv_objext=`echo $ac_file | sed -e s/conftest.//` ;;
    esac
  done
else
  AC_MSG_ERROR([installation or configuration problem; compiler does not work])
fi
rm -f conftest*])
AC_MSG_RESULT($ac_cv_objext)
OBJEXT=$ac_cv_objext
ac_objext=$ac_cv_objext
AC_SUBST(OBJEXT)])

dnl Determine the linker flags (e.g. `-L' and `-l') for the Fortran 77
dnl intrinsic and run-time libraries that are required to successfully
dnl link a Fortran 77 program or shared library.  The output variable
dnl FLIBS is set to these flags.
dnl 
dnl This macro is intended to be used in those situations when it is
dnl necessary to mix, e.g. C++ and Fortran 77, source code into a single
dnl program or shared library.
dnl 
dnl For example, if object files from a C++ and Fortran 77 compiler must
dnl be linked together, then the C++ compiler/linker must be used for
dnl linking (since special C++-ish things need to happen at link time
dnl like calling global constructors, instantiating templates, enabling
dnl exception support, etc.).
dnl 
dnl However, the Fortran 77 intrinsic and run-time libraries must be
dnl linked in as well, but the C++ compiler/linker doesn't know how to
dnl add these Fortran 77 libraries.  Hence, the macro
dnl `AC_F77_LIBRARY_LDFLAGS' was created to determine these Fortran 77
dnl libraries.
dnl
dnl This macro was packaged in its current form by Matthew D. Langston
dnl <[e-mail]>.  However, nearly all of this macro
dnl came from the `OCTAVE_FLIBS' macro in `octave-2.0.13/aclocal.m4',
dnl and full credit should go to John W. Eaton for writing this
dnl extremely useful macro.  Thank you John.
dnl
dnl AC_F77_LIBRARY_LDFLAGS()
AC_DEFUN(AC_F77_LIBRARY_LDFLAGS,
[AC_MSG_CHECKING([for Fortran 77 libraries])
AC_REQUIRE([AC_PROG_F77])
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CACHE_VAL(ac_cv_flibs,
[changequote(, )dnl
dnl Write a minimal program and compile it with -v.  I don't know what
dnl to do if your compiler doesn't have -v...
echo "      END" > conftest.f
foutput=`${F77} -v -o conftest conftest.f 2>&1`
dnl
dnl The easiest thing to do for xlf output is to replace all the commas
dnl with spaces.  Try to only do that if the output is really from xlf,
dnl since doing that causes problems on other systems.
dnl
xlf_p=`echo $foutput | grep xlfentry`
if test -n "$xlf_p"; then
  foutput=`echo $foutput | sed 's/,/ /g'`
fi
dnl
ld_run_path=`echo $foutput | \
  sed -n -e 's/^.*LD_RUN_PATH *= *\([^ ]*\).*/\1/p'`
dnl
dnl We are only supposed to find this on Solaris systems...
dnl Uh, the run path should be absolute, shouldn't it?
dnl
case "$ld_run_path" in
  /*)
    if test "$ac_cv_prog_gcc" = yes; then
      ld_run_path="-Xlinker -R -Xlinker $ld_run_path"
    else
      ld_run_path="-R $ld_run_path"
    fi
  ;;
  *)
    ld_run_path=
  ;;
esac
dnl
flibs=
lflags=
dnl
dnl If want_arg is set, we know we want the arg to be added to the list,
dnl so we don't have to examine it.
dnl
want_arg=
dnl
for arg in $foutput; do
  old_want_arg=$want_arg
  want_arg=
dnl
dnl None of the options that take arguments expect the argument to
dnl start with a -, so pretend we didn't see anything special.
dnl
  if test -n "$old_want_arg"; then
    case "$arg" in
      -*)
        old_want_arg=
      ;;
    esac
  fi
  case "$old_want_arg" in
    '')
      case $arg in
        /*.a)
          exists=false
          for f in $lflags; do
            if test x$arg = x$f; then
              exists=true
            fi
          done
          if $exists; then
            arg=
          else
            lflags="$lflags $arg"
          fi
        ;;
        -bI:*)
          exists=false
          for f in $lflags; do
            if test x$arg = x$f; then
              exists=true
            fi
          done
          if $exists; then
            arg=
          else
            if test "$ac_cv_prog_gcc" = yes; then
              lflags="$lflags -Xlinker $arg"
            else
              lflags="$lflags $arg"
            fi
          fi
        ;;
        -lang* | -lcrt0.o | -lc | -lgcc)
          arg=
        ;;
        -[lLR])
          want_arg=$arg
          arg=
        ;;
        -[lLR]*)
          exists=false
          for f in $lflags; do
            if test x$arg = x$f; then
              exists=true
            fi
          done
          if $exists; then
            arg=
          else
            case "$arg" in
              -lkernel32)
                case "$canonical_host_type" in
                  *-*-cygwin*)
                    arg=
                  ;;
                  *)
                    lflags="$lflags $arg"
                  ;;
                esac
              ;;
              -lm)
              ;;
              *)
                lflags="$lflags $arg"
              ;;
            esac
          fi
        ;;
        -u)
          want_arg=$arg
          arg=
        ;;
        -Y)
          want_arg=$arg
          arg=
        ;;
        *)
          arg=
        ;;
      esac
    ;;
    -[lLR])
      arg="$old_want_arg $arg"
    ;;
    -u)
      arg="-u $arg"
    ;;
    -Y)
dnl
dnl Should probably try to ensure unique directory options here too.
dnl This probably only applies to Solaris systems, and then will only
dnl work with gcc...
dnl
      arg=`echo $arg | sed -e 's%^P,%%'`
      SAVE_IFS=$IFS
      IFS=:
      list=
      for elt in $arg; do
        list="$list -L$elt"
      done
      IFS=$SAVE_IFS
      arg="$list"
    ;;
  esac
dnl
  if test -n "$arg"; then
    flibs="$flibs $arg"
  fi
done
if test -n "$ld_run_path"; then
  flibs_result="$ld_run_path $flibs"
else
  flibs_result="$flibs"
fi
changequote([, ])dnl
ac_cv_flibs="$flibs_result"])
FLIBS="$ac_cv_flibs"
AC_SUBST(FLIBS)dnl
AC_MSG_RESULT($FLIBS)
])


dnl ### Checks for operating system services


AC_DEFUN(AC_SYS_INTERPRETER,
[# Pull the hash mark out of the macro call to avoid m4 problems.
ac_msg="whether #! works in shell scripts"
AC_CACHE_CHECK($ac_msg, ac_cv_sys_interpreter,
[echo '#! /bin/cat
exit 69
' > conftest
chmod u+x conftest
(SHELL=/bin/sh; export SHELL; ./conftest >/dev/null)
if test $? -ne 69; then
   ac_cv_sys_interpreter=yes
else
   ac_cv_sys_interpreter=no
fi