https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104080
--- Comment #2 from Hans-Peter Nilsson <hp at gcc dot gnu.org> --- Created attachment 52215 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52215&action=edit patch for endian.h issue This patch is not sufficient: after this, I get: libtool: compile: /X-obj/./gcc/xgcc -shared-libgcc -B/X-obj/./gcc -nostdinc++ -L/X-obj/cris-elf/libstdc++-v3/src -L/X-obj/cris-elf/libstdc++-v3/src/.libs -L/X-obj/cris-elf/libstdc++-v3/libsupc++/.libs -nostdinc -B/X-obj/cris-elf/newlib/ -isystem /X-obj/cris-elf/newlib/targ-include -isystem /X-gccsrc/newlib/libc/include -B/X-obj/cris-elf/libgloss/cris -L/X-obj/cris-elf/libgloss/libnosys -L/X-gccsrc/libgloss/cris -B/mnt/storage0/hp/tmpdir/break22017-1/pre/cris-elf/bin/ -B/mnt/storage0/hp/tmpdir/break22017-1/pre/cris-elf/lib/ -isystem /mnt/storage0/hp/tmpdir/break22017-1/pre/cris-elf/include -isystem /mnt/storage0/hp/tmpdir/break22017-1/pre/cris-elf/sys-include -I/X-gccsrc/libstdc++-v3/../libgcc -I/X-obj/cris-elf/libstdc++-v3/include/cris-elf -I/X-obj/cris-elf/libstdc++-v3/include -I/X-gccsrc/libstdc++-v3/libsupc++ -std=gnu++17 -nostdinc++ -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=floating_from_chars.lo -fimplicit-templates -g -O2 -c /X-gccsrc/libstdc++-v3/src/c++17/floating_from_chars.cc -o floating_from_chars.o In file included from /X-gccsrc/libstdc++-v3/src/c++17/floating_from_chars.cc:65: /X-gccsrc/libstdc++-v3/src/c++17/fast_float/fast_float.h: In function 'void {anonymous}::fast_float::round(adjusted_mantissa&, callback)': /X-gccsrc/libstdc++-v3/src/c++17/fast_float/fast_float.h:2469:20: error: no matching function for call to 'min(int32_t&, int)' 2469 | cb(am, std::min(shift, 64)); | ~~~~~~~~^~~~~~~~~~~ In file included from /X-obj/cris-elf/libstdc++-v3/include/string:50, from /X-gccsrc/libstdc++-v3/src/c++17/floating_from_chars.cc:35: /X-obj/cris-elf/libstdc++-v3/include/bits/stl_algobase.h:230:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)' 230 | min(const _Tp& __a, const _Tp& __b) | ^~~ /X-obj/cris-elf/libstdc++-v3/include/bits/stl_algobase.h:230:5: note: template argument deduction/substitution failed: /X-gccsrc/libstdc++-v3/src/c++17/fast_float/fast_float.h:2469:20: note: deduced conflicting types for parameter 'const _Tp' ('long int' and 'int') 2469 | cb(am, std::min(shift, 64)); | ~~~~~~~~^~~~~~~~~~~ /X-obj/cris-elf/libstdc++-v3/include/bits/stl_algobase.h:278:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)' 278 | min(const _Tp& __a, const _Tp& __b, _Compare __comp) | ^~~ /X-obj/cris-elf/libstdc++-v3/include/bits/stl_algobase.h:278:5: note: template argument deduction/substitution failed: /X-gccsrc/libstdc++-v3/src/c++17/fast_float/fast_float.h:2469:20: note: deduced conflicting types for parameter 'const _Tp' ('long int' and 'int') 2469 | cb(am, std::min(shift, 64)); | ~~~~~~~~^~~~~~~~~~~ make[5]: *** [Makefile:585: floating_from_chars.lo] Error 1 make[5]: Leaving directory '/X-obj/cris-elf/libstdc++-v3/src/c++17' This is likely the usual size_t mismatch. Unassigning myself.