Pass compile flags to libitm/ subdirectory (and in general)

[Maxim Blinov via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hi all,

Is it possible to pass compilation flags to subdirectories of GCC,
e.g. to libitm/?

I'd like to pass CFLAGS="-Wno-error" CXXFLAGS="-Wno-error" to work on
some stuff (among possibly others in the future), but when I try to

$ /src/gcc/.configure CFLAGS="-Wno-error", CXXFLAGS="-Wno-error"
--prefix=foo --target=bar

and then do

$ CFLAGS="-Wno-error" CXXFLAGS="-Wno-error" make

only the core GCC code honours those flags. How can I get libitm/ to
honour them too?

Maxim