libstdc++-v3 configure question

[Mark Mitchell]

>>>>> "Benjamin" == Benjamin Kosnik <bkoz@redhat.com> writes:

    Benjamin> the third option, which seems to make the most sense, is
    Benjamin> to have __STRICT_ANSI__ guards on all the discovered
    Benjamin> bits in the v3 headers, so that -ansi on the compile
    Benjamin> line will turn off all the non-standard bits in the
    Benjamin> headers.

That might break things if any of the guarded things impact sizes of
types, mangled names, etc.  

Also, some key things (like thread-safety functions) are typically
guarded in C library header files -- but we need to use them even with
-ansi.

I think you can only get this right by being in bed with the library
header files (when you could put the C stuff you need in some hidden
namespace when including it from the C++ library).  On systems like
AIX and HPUX, I think the CPP_CPLUSPLUS_SPEC thing is about the best
you can do. :-(

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com