SoftHSMv2/m4/acx_64bit.m4

   1 AC_DEFUN([ACX_64BIT],[
   2         AC_ARG_ENABLE(
   3                 [64bit],
   4                 [AS_HELP_STRING([--enable-64bit],[enable 64-bit compiling @<:@disabled@:>@])],
   5                 [enable_64bit="${enableval}"],
   6                 [enable_64bit="no"])
   7
   8         if test "x$enable_64bit" = "xyes"
   9         then
  10                 tmp_CFLAGS=$CFLAGS
  11                 CFLAGS="-m64"
  12                 AC_CACHE_CHECK([if we can compile in 64-bit mode], [acx_cv_prog_cc_64bit],[
  13                         acx_cv_prog_cc_64bit=no
  14                         AC_COMPILE_IFELSE([
  15                                 AC_LANG_PROGRAM([],[return sizeof(void*) == 8 ? 0 : 1;])
  16                         ], [
  17                                 acx_cv_prog_cc_64bit=yes
  18                         ])
  19                 ])
  20
  21                 if test "x$acx_cv_prog_cc_64bit" = xyes; then
  22                         AC_MSG_CHECKING([if we can run 64-bit programs])
  23                         AC_CACHE_VAL([acx_cv_sys_64bit],[
  24                                 acx_cv_sys_64bit=no
  25                                 AC_RUN_IFELSE([
  26                                         AC_LANG_PROGRAM([],[return sizeof(void*) == 8 ? 0 : 1;])
  27                                 ], [
  28                                         AC_MSG_RESULT(yes)
  29                                         acx_cv_sys_64bit=yes
  30                                 ],[
  31                                         AC_MSG_RESULT(no)
  32                                         AC_MSG_ERROR([Don't know how to compile in 64-bit mode.])
  33                                         CFLAGS=$tmp_CFLAGS
  34                                 ],[
  35                                         AC_MSG_WARN([Cannot test, assuming 64-bit])
  36                                         acx_cv_sys_64bit=yes
  37                                 ])
  38                         ])
  39
  40                         CXXFLAGS="-m64 $CXXFLAGS"
  41                         LDFLAGS="-m64 $LDFLAGS"
  42                         CFLAGS="-m64 $tmp_CFLAGS"
  43                 else
  44                         CFLAGS=$tmp_CFLAGS
  45                 fi
  46         fi
  47
  48 ])