On 12/14/2011 11:14 AM, Tom Lane wrote:
-ffloat-store is a brute force solution, I think, and would affect old
versions of gcc that don't exhibit any problems.  I would suggest
altering configure to see whether the compiler recognizes
-fexcess-precision=standard and adding that to CFLAGS if so.

OK, this and the associated configure change seems to do the trick:

   diff --git a/configure.in b/configure.in
   index 9cf084d..b29bb61 100644
   --- a/configure.in
   +++ b/configure.in
   @@ -437,6 +437,8 @@ if test "$GCC" = yes -a "$ICC" = no; then
       # Disable optimizations that assume no overflow; needed for gcc 4.3+
   +  # Disable FP optimizations that cause isinf errors on gcc 4.5+
   +  PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
     elif test "$ICC" = yes; then
       # Intel's compiler has a bug/misoptimization in checking for
       # division by NAN (NaN == 0), -mp1 fixes it, so add it to the

I guess we should backpatch it?



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