ifeq ($(subdir),math)## Some files which need to go both into libc and libm have external# dependencies which need to be resolved differently for libc# vs. libm.  For example, inside libc, __libm_error_support needs to# resolve to HIDDEN_JUMPTARGET(__libm_error_support) whereas within# libm it always resolves to __libm_error_support.  Such files need to# be compiled twice.  Fortunately, math/Makefile already has logic to# support this: if a file starts with "s_", make will automatically# generate a matching file whose name starts with "m_" which simply# includes the corresponding "s_" file.#duplicated-routines = s_libm_ldexp s_libm_ldexpf s_libm_ldexpl \		      s_libm_scalbn s_libm_scalbnf s_libm_scalbnllibm-sysdep_routines += s_erfc s_erfcf s_erfcl \			s_matherrf s_matherrl libm_reduce \			libm_error \			libm_frexp libm_frexpf libm_frexpl \			libm_sincos libm_sincosf libm_sincosl \			libm_sincos_large \			libm_lgamma libm_lgammaf libm_lgammal \			libm_scalblnf \			$(duplicated-routines:s_%=m_%)sysdep_routines += libc_libm_error libm_frexp libm_frexpf libm_frexpl \		   $(duplicated-routines)sysdep-CPPFLAGS += -include libm-symbols.h \	-D__POSIX__ -Dopensource \	-D_LIB_VERSIONIMF=_LIB_VERSION \	-DSIZE_INT_32 -DSIZE_LONG_INT_64 -DSIZE_LONG_LONG_INT_64 \	-DSIZE_LONG_64 -DIA64endif