Binutils compilation for GCC cross-compiler failing

../../binutils-2.25/libiberty/pex-unix.c:787:13: warning: identifier 'this' conflicts with C++ keyword [-Wc++-compat]
       free (this);
             ^
Makefile:1104: recipe for target 'pex-unix.o' failed
make[2]: *** [pex-unix.o] Error 1
make[2]: Leaving directory '/usr/src/build-binutils/libiberty'
Makefile:8041: recipe for target 'all-libiberty' failed
make[1]: *** [all-libiberty] Error 2
make[1]: Leaving directory '/usr/src/build-binutils'
Makefile:835: recipe for target 'all' failed
make: *** [all] Error 2