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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/100057] There are no freestanding C++
Date: Tue, 13 Apr 2021 02:20:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100057

--- Comment #9 from cqwrteur <unlvsur at live dot com> ---
looking for a compliant stdint.h in stdint.h, checking for uintmax_t... no
looking for a compliant stdint.h in inttypes.h, checking for uintmax_t... no
looking for a compliant stdint.h in sys/inttypes.h, checking for uintmax_t.=
..
no
looking for an incomplete stdint.h in stdint.h, checking for uint32_t... no
looking for an incomplete stdint.h in inttypes.h, checking for uint32_t... =
no
looking for an incomplete stdint.h in sys/inttypes.h, checking for uint32_t=
...
no
looking for u_intXX_t types in sys/types.h, checking for u_int32_t... no
looking for u_intXX_t types in inttypes.h, checking for u_int32_t... no
looking for u_intXX_t types in sys/inttypes.h, checking for u_int32_t... no
checking what to include in include/gstdint.h... stddef.h (using manual
detection)
checking size of void *... 0
checking size of long... 0
checking size of int... 0
checking size of short... 0
checking size of char... 0
checking for type equivalent to int8_t... configure: error: no 8-bit type,
please report a bug
make[1]: *** [Makefile:13313: configure-target-libstdc++-v3] Error 1
make[1]: Leaving directory '/home/cqwrteur/myhome/gcc2_elf_build'
make: *** [Makefile:965: all] Error 2

The issue is that there is no such header called stdint.h. What we have is
stdint-gcc.h which is automatically generated by the compiler.

We have two options.
1. just redefine them in cstdint with freestanding.
2. use autotool to include stdint-gcc.h when stdint.h does not exist.=