Canadian cross build and libstdc++ configure

[Steve Ellcey]

On Tue, 2013-10-29 at 16:45 -0700, pinskia@gmail.com wrote:

> I ran into similar issues building this way.  The way I ended up working around is just copying the
> Already built libraries from a non Canadian cross build.
> 
> Thanks,
> Andrew

Yes, but we should fix it so that we don't need a workaround.  I am
going to submit a patch that checks for fenv.h and complex.h using the
C compiler instead of the C++ compiler by adding a call to
AC_CHECK_HEADERS in libstdc++ configure.ac.  That fixes the problem for
me and allows me to do a build with no workarounds because then, when
GLIBCXX_CHECK_C99_TR1 checks for the headers, it uses the saved values
which will be false if the headers don't exist in C.

Steve Ellcey
sellcey@mips.com