Re: sys-include/newlib.h

[Jeff Johnston <jjohnstn at redhat dot com>]

Hi Jon,

What you are trying is unsupported.  Newlib configuration needs to run.
Have you tried --with-newlib?  You might need to add a configure-target-newlib
or all-target-newlib target to your configure call.  

-- Jeff J.

----- Original Message -----
> Hi,
> 
> I'm compiling newlib 2.4.0 with gcc 6.1 configured as a cross compiler. In
> order for some gcc libc support to be built, I need to configure with
> --with-headers=/path/newlib/libc/include/
> 
> This results in the .h files from that directory being copied to
> target/sys-include. GCC's built in search path searches target/sys-include
> before target/include. This results in a bit of a problem when compiling C++
> code, as target/sys-include/newlib.h differs from target/include/newlib.h
> 
> target/sys-include/newlib.h is an otherwise empty file that just says:
> 
> /* dummy file for external tools to use.  Real file is created by
>    newlib configuration. */
> 
> Whereas target/include/newlib.h includes the newlib configuration macros,
> such as:
> 
> #define _HAVE_LONG_DOUBLE 1
> 
> This causes an error "'::strtold' has not been declared"  when compiling C++
> code, as the prototype for this function in stdlib.h, depends on this macro:
> 
> #ifdef _HAVE_LONG_DOUBLE
> extern long double strtold (const char *__restrict, char **__restrict);
> #endif /* _HAVE_LONG_DOUBLE */
> 
> Which is not defined as  target/sys-include/newlib.h is included instead of
> target/include/newlib.h
> 
> The same applies to _newlib_version.h too.
> 
> And ideas on the best way to resolve this? Is it a gcc or newlib problem or
> user error?
> 
> Thanks,
> Jon
> 
>