dnl Check for the presence of the Sun Studio compiler.
dnl If Sun Studio compiler is found, set appropriate flags.
dnl Additionally, Sun Studio doesn't default to 64-bit by itself,
dnl nor does it automatically look in standard Solaris places for
dnl 64-bit libs, so we must add those options and paths to the search
dnl paths.

dnl TODO(kenton):  This is pretty hacky.  It sets CXXFLAGS, which the autoconf
dnl docs say should never be overridden except by the user.  It also isn't
dnl cross-compile safe.  We should fix these problems, but since I don't have
dnl Sun CC at my disposal for testing, someone else will have to do it.

AC_DEFUN([ACX_CHECK_SUNCC],[

  AC_LANG_PUSH([C++])
  AC_CHECK_DECL([__SUNPRO_CC], [SUNCC="yes"], [SUNCC="no"])
  AC_LANG_POP()


  AC_ARG_ENABLE([64bit-solaris],
    [AS_HELP_STRING([--disable-64bit-solaris],
      [Build 64 bit binary on Solaris @<:@default=on@:>@])],
             [ac_enable_64bit="$enableval"],
             [ac_enable_64bit="yes"])

  AS_IF([test "$SUNCC" = "yes" -a "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
    dnl Sun Studio has a crashing bug with -xO4 in some cases. Keep this
    dnl at -xO3 until a proper test to detect those crashes can be done.
    CXXFLAGS="-g0 -xO3 -xlibmil -xdepend -xbuiltin -mt -compat=5 -library=stlport4 -library=Crun -template=no%extdef ${CXXFLAGS}"
  ])

  case $host_os in
    *solaris*)
      AC_CHECK_PROGS(ISAINFO, [isainfo], [no])
      AS_IF([test "x$ISAINFO" != "xno"],
            [isainfo_b=`${ISAINFO} -b`],
            [isainfo_b="x"])

      AS_IF([test "$isainfo_b" != "x"],[

        isainfo_k=`${ISAINFO} -k`

        AS_IF([test "x$ac_enable_64bit" = "xyes"],[

          AS_IF([test "x${ac_cv_env_LDFLAGS_set}" = "x"],[
            LDFLAGS="-L/usr/local/lib/${isainfo_k} ${LDFLAGS}"
          ])

          AS_IF([test "x$libdir" = "x\${exec_prefix}/lib"],[
           dnl The user hasn't overridden the default libdir, so we'll
           dnl the dir suffix to match solaris 32/64-bit policy
           libdir="${libdir}/${isainfo_k}"
          ])

          dnl This should just be set in CPPFLAGS and in LDFLAGS, but libtool
          dnl does the wrong thing if you don't put it into CXXFLAGS. sigh.
          AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
            CXXFLAGS="${CXXFLAGS} -m64"
            ac_cv_env_CXXFLAGS_set=set
            ac_cv_env_CXXFLAGS_value='-m64'
          ])

          AS_IF([test "$target_cpu" = "sparc" -a "x$SUNCC" = "xyes" ],[
            CXXFLAGS="-xmemalign=8s ${CXXFLAGS}"
          ])
        ])
      ])
    ;;
  esac

])