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Existing toolchain builds rely on the similarity between picolibc and newlib when building libstdc++ and use --with-newlib. Switch to the picolibc 16-bit _ctype_wide array which provides separate values for ctype_base::blank and ctype_base::space. This fixes a bug where libstdc++ was including '\f', '\n', '\r' and '\v' in the set of 'blank' chars. Afterwards, only ' ' and '\t' are in this set, as specified by C++ 11. libstdc++-v3/ChangeLog: * acinclude.m4 (GLIBCXX_CONFIGURE): Add --with-picolibc. * configure: Regenerate. * configure.ac: Add handling for with_picolibc=yes. * config/os/picolibc/ctype_base.h: New file. * config/os/picolibc/ctype_configure_char.cc: New file. * config/os/picolibc/ctype_inline.h: New file. * config/os/picolibc/os_defines.h: New file. Signed-off-by: Keith Packard <keithp@keithp.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.