cc/gcc: Apply CT_CC_GCC_DISABLE_PCH to do_cc_core.
Otherwise, users have to input --disable-libstdcxx-pch option
when building bare-metal CANADIAN C++ compiler.
Reviewed-by: Michael Hope
Signed-off-by: Zhenqiang Chen <zhenqiang.chen@linaro.org>
(transplanted from e3e1c9d45bddfbfb433ee9d583faf42fa31f50c0)
1 # Dummy config file to not use a C library *at all*
3 ## depends on BARE_METAL
5 ## help Do not use a C library.
7 ## help This is usefull if your project is self-contained, does not rely on
8 ## help an external C library, and provides all the necessary bits.
10 ## help Most probably usefull to bootloaders, as they generally don't depend
11 ## help on the C library.
13 ## help If unsure: do *not* choose that, and use another option in the choice.