c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Ulrich Jakobus]

Just a final closing remark on this issue: On 2002-03-14 the sub-
routine z_log.c as part if libf2c has been updated as follows so
that the compilation problems with -O2 or -O3 are avoided when the
define -DNO_DOUBLE_EXTENDED is used. Change of source and log message
are from the f2c maintainer David M. Gay:

  14 March 2002: z_log.c: add code to cope with buggy compilers
                 (e.g., some versions of gcc under -O2 or -O3)
                 that do floating-point comparisons against values
                 computed into extended-precision registers on some
                 systems (such as Intel IA32 systems).  Compile with
                 -DNO_DOUBLE_EXTENDED to omit the new logic. 

Thanks,

Ulrich