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| author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2013-09-15 22:46:47 +0000 |
|---|---|---|
| committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2013-09-15 22:46:47 +0000 |
| commit | fb7aa04d8f522b1350ef5f1fdde90a8a92c1d8b4 (patch) | |
| tree | fc15318ab256a820c36df65c4e90c89dcbe85a81 /configure.ac | |
| parent | 7ecd359041b902320f6bf9216166a457f34ab330 (diff) | |
| download | mpfr-fb7aa04d8f522b1350ef5f1fdde90a8a92c1d8b4.tar.gz | |
[configure.ac] Detect broken _Decimal64 support on powerpc64 with
the mode32 ABI.
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@8679 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/configure.ac b/configure.ac index 614848583..a32106fc5 100644 --- a/configure.ac +++ b/configure.ac @@ -263,6 +263,9 @@ dnl be disabled in the GCC build). See: dnl http://gcc.gnu.org/gcc-4.3/changes.html dnl _Decimal64 is not yet defined in GCC for C++: dnl http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51364 +dnl _Decimal64 support is broken with GCC 4.6.3 and 4.7.2 on powerpc64 +dnl with the mode32 ABI, e.g. "-m32 -mpowerpc64 -mtune=970 -O3"; this +dnl is detected by the x != x test below. AC_ARG_ENABLE(decimal-float, [ --enable-decimal-float build conversion functions from/to decimal floats [[default=no]]], @@ -280,16 +283,21 @@ Please use another compiler or build MPFR without --enable-decimal-float.])] AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <stdlib.h> ]], [[ +volatile _Decimal64 x = 1; union { double d; _Decimal64 d64; } y; +if (x != x) return 3; y.d64 = 1234567890123456.0dd; return y.d == 0.14894469406741037E-123 ? 0 : y.d == 0.59075095508629822E-68 ? 1 : 2; ]])], [AC_MSG_RESULT(DPD) AC_DEFINE([DPD_FORMAT],1,[])], - [if test "$?" != 1 ; then - AC_MSG_FAILURE(neither DPD nor BID) - fi - AC_MSG_RESULT(BID)], + [case "$?" in + 1) AC_MSG_RESULT(BID) ;; + 2) AC_MSG_FAILURE(neither DPD nor BID) ;; + 3) AC_MSG_FAILURE([_Decimal64 support is broken. +Please use another compiler or build MPFR without --enable-decimal-float.]) ;; + *) AC_MSG_FAILURE(internal error) ;; + esac], [AC_MSG_RESULT(assuming DPD) AC_DEFINE([DPD_FORMAT],1,[])]) ;; |