Adding a new thread model to libstdc++-v3

[Jonathan Wakely]

On 14 December 2016 at 11:25, Silvano Seva wrote:
> Good morning,
>
> I'm a developer of the miosix kernel (www.miosix.org), which currently uses
> a patched version of GCC 4.7.3 to build the kernel and user's sources. For
> testing purpuoses I'm trying to update the compiler to GCC 6.2.0 reapplying
> the patches made for the older GCC and modifying them when necessary.
> I was able to apply all the patches but I get errors at compile time that
> are related to the fact that the thread model for libstdc++-v3 is
> unspecified. I noticed that because the gthr-default.h file is correct in
> the directories related to libgcc but is empty into those related to
> libstdc++-v3.

Look at the rule in libstdc++-v3/include/Makefile.am which uses sed to
create the libstdc++ copy of gthr-default.h

> How do I specify the thread model for libstdc++-v3?

You don't specify it. It needs to use the same thread model as libgcc.