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C++ xgcc for arm-none-eabi fails in 7.1, 7.2 due to undefined identifiers

When compiling libssp, ssp.c, function __guard_setup:
O_RDONLY is undeclared (ssp.c:93:34),
ssize_t is an unknown type name (ssp.c:96:7), and
size_t is an unknown type name (ssp.c:113:25).

../../src/gcc-7.2.0/configure --target=$TARGET --prefix=$PREFIX
--with-cpu=cortex-m4 --with-fpu=fpv4-sp-d16 --with-float=hard
--with-mode=thumb --enable-multilib --enable-interwork
--enable-languages=c,c++ --with-system-zlib --with-newlib
--disable-shared --disable-nls --with-gnu-as --with-gnu-ld

A bootstrap C compiler is generated properly when passing --without-headers.

I can provide more details and command output. Recently I was able to
get 6.3.0 as close to working with Newlib 2.5 as I can tell, so this
is not extremely urgent. Unfortunately I may have other questions
about earlier GCC versions.

Any suggestions related to generating cross toolchains, specifically
generating a toolchain close to the one found at, would be
extremely helpful. Any help provided will be used to better support
for generating toolchains with the crossdev project.

I am very confused and what I want to do seems to be poorly documented.

Thanks in advance,

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