gcc: Allow setting custom target CXXFLAGS

This commit adds two additional arguments (`cxxflags_for_target` and
`extra_cxxflags_for_target`) for the gcc backend build function that
can be used to specify custom target CXXFLAGS.

By default, the target CXXFLAGS is set to the target CFLAGS. When
`cxxflags_for_target` is specified however, it overrides that behaviour
and allows setting different target CXXFLAGS from the target CFLAGS.

The `extra_cxxflags_for_target` argument can be used to specify the
extra target CXXFLAGS to be appended to the target CXXFLAGS. This is
useful when it is necessary to append CXX-specific flags to the
existing CFLAGS to be used as the target CXXFLAGS.

A useful application of this is building full and nano versions of
libstdc++ with different target CXXFLAGS as necessitated by
`nano.specs`.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

0 files changed, 0 insertions, 0 deletions