<iostream> still included in embedded systems

[pirgia]

I know the issue has already been reported in issue #57 and the following code:

#if defined(__STDC_HOSTED__)
#    define FLUENT_HOSTED 1
#else
#    define FLUENT_HOSTED 0
#endif

was added to disable the inclusion of <iostream> for freestanding compilers.
Unfortunately, for the STM32 microcontrollers at least, __STDC_HOSTED__ is defined and is equal to 1, so <iostream> is still included.
Setting the -ffreestanding flag is of little use as this has many more undesired collateral effects beyond setting __STDC_HOSTED__ to 0.
The footprint of <iostream> is around 150 kB, which is an enormous amount in my embedded world.

Would it be possible to add a user defined macro that (in conjunction with the __STDC_HOSTED__ macro) enables or disables the inclusion of the <iostream> library?

Thanks for your attention.