Some targets may support long double variables but in the same
time may lack support of long double functions like fabsl().
Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
It is useful when tests are executed not from build directory. So
the path of the build directory may be passed through site.exp or
runtest.
Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>