[v3] Handle different versions of Solaris 8 <iso/math_iso.h>, <iso/stdlib_iso.h>

[Rainer Orth]

Hi Paolo,

>> I guess the patch is ok now?
>
> Yes. Nice that Jon replied in the meanwhile and clarified the undefined behavior issue: for the time being I think we can keep the __cplusplus checks, should also help during this testing period. We can certainly clean up the thing later. Maybe you could add a comment somewhere summarizing what Jon wrote.

for the moment, I've installed the patch as is.  It's probably better to
add some statement along those lines to user docs (and mention the
change in gcc-4.7/changes.html :-)

Btw., I just noticed the following in Oracle Studio 12.3 Beta CC(1):

     -features=a
          Enables/disables various C++ language features.

          The following table lists the -features suboption key-
          words and their meanings.  The prefix no% applied to a
          suboption disables that suboption.

          Value          Meaning
[...]
          cplusplus_redef
               Allow the normally pre-defined macro __cplusplus
               to be redefined by a -D option on the command
               line. Attempting to redefine __cplusplus with a
               #define directive in source code is not allowed.

               Example:
                CC -features=cplusplus_redef -D__cplusplus=1 ...

               The g++ compiler typically predefines the
               __cplusplus macro to 1, and source code might
               depend on this non-standard value. (The standard
               value is 199711L for compilers implementing the
               1998 C++ standard or the 2003 update. Future stan-
               dards will require a larger value for the macro.)

               Do not use this option unless you need to redefine
               __cplusplus to 1 in order to compile code intended
               for g++.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University