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 --- gcc-4.0.0/boehm-gc/include/gc.h-orig 2005-04-28 22:28:57.000000000 -0500
2 +++ gcc-4.0.0/boehm-gc/include/gc.h 2005-04-28 22:30:38.000000000 -0500
6 # if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1 || __GLIBC__ > 2) \
7 - && !defined(__ia64__)
8 + && !defined(__ia64__) && !defined(__UCLIBC__)
9 # ifndef GC_HAVE_BUILTIN_BACKTRACE
10 # define GC_HAVE_BUILTIN_BACKTRACE