revert changeset r8412 (_Decimal64 might be defined in C++, but not as a macro)

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@8414 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 3 insertions, 9 deletions

diff --git a/configure.ac b/configure.ac
index 7a35527d4..8ae3bdb6f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -236,6 +236,8 @@ AC_PROG_CC
 AC_PROG_CPP
 AC_LANG(C)
 
+dnl _Decimal64 is not defined in C++
+dnl cf http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51364
 AC_ARG_ENABLE(decimal-float,
    [  --enable-decimal-float  build conversion functions from/to decimal floats
                           [[default=no]]],
@@ -243,21 +245,13 @@ AC_ARG_ENABLE(decimal-float,
       yes) AC_DEFINE([MPFR_WANT_DECIMAL_FLOATS],1,
               [Build decimal float functions])
            AC_MSG_CHECKING(if compiler knows _Decimal64)
-           AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-#ifndef _Decimal64
-typedef float _Decimal64 __attribute__((mode(DD)));
-#endif
-_Decimal64 x;
-]])],
+           AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[_Decimal64 x;]])],
               [AC_MSG_RESULT(yes)],
               [AC_MSG_ERROR([Compiler doesn't know _Decimal64; try GCC >= 4.4.3]
            )])
            AC_MSG_CHECKING(decimal float format)
            AC_RUN_IFELSE([AC_LANG_PROGRAM([[
 #include <stdlib.h>
-#ifndef _Decimal64
-typedef float _Decimal64 __attribute__((mode(DD)));
-#endif
 ]], [[
 union { double d; _Decimal64 d64; } y;
 y.d64 = 1234567890123456.0dd;