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/usr/lib/arm-none-eabi/newlib/nano.specs is in libnewlib-arm-none-eabi 2.2.0+git20150830.5a3d536-1.

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%rename link                nano_link
%rename link_gcc_c_sequence                nano_link_gcc_c_sequence
%rename cpp		nano_cpp

*cpp:
-isystem =/include/newlib-nano %(nano_cpp)

*nano_libc:
-lc_nano

*nano_libgloss:
%{specs=rdimon.specs:-lrdimon_nano} %{specs=nosys.specs:-lnosys}

*link_gcc_c_sequence:
%(nano_link_gcc_c_sequence) --start-group %G %(nano_libc) %(nano_libgloss) --end-group

*link:
%(nano_link) %:replace-outfile(-lc -lc_nano) %:replace-outfile(-lg -lg_nano) %:replace-outfile(-lrdimon -lrdimon_nano) %:replace-outfile(-lstdc++ -lstdc++_nano) %:replace-outfile(-lsupc++ -lsupc++_nano)

*lib:
%{!shared:%{g*:-lg_nano} %{!p:%{!pg:-lc_nano}}%{p:-lc_p}%{pg:-lc_p}}