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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99499] build failure for android bionic toolchains.
 error: '_U' was not declared in this scope
Date: Wed, 10 Mar 2021 16:20:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99499

--- Comment #3 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jonathan Wakely from comment #2)
> Obviously _U worked at some point when that file was added. CCing Maxim to
> figure out what changed and whether we want to support the old ctype
> constants as well as whatever Android defines now.

I guess now Android has now shifted to LLVM and no one tested that on GCC
anymore.

I tweak around the value by myself and no it does not work, unfortunately.

d:/msys64/x86_64-linux-android/bin/../lib/gcc/x86_64-linux-android/11.0.1/.=
./../../../x86_64-linux-android/bin/ld.exe:
d:/msys64/x86_64-linux-android/bin/../lib/gcc/x86_64-linux-android/11.0.1/.=
./../../../x86_64-linux-android/lib/../lib64/libstdc++.so:
undefined reference to `std::ctype<char>::ctype(unsigned short const*, bool,
unsigned long)'
d:/msys64/x86_64-linux-android/bin/../lib/gcc/x86_64-linux-android/11.0.1/.=
./../../../x86_64-linux-android/bin/ld.exe:
d:/msys64/x86_64-linux-android/bin/../lib/gcc/x86_64-linux-android/11.0.1/.=
./../../../x86_64-linux-android/lib/../lib64/libstdc++.so:
undefined reference to `std::ctype<char>::ctype(unsigned short const*, bool,
unsigned long)'
d:/msys64/x86_64-linux-android/bin/../lib/gcc/x86_64-linux-android/11.0.1/.=
./../../../x86_64-linux-android/bin/ld.exe:
d:/msys64/x86_64-linux-android/bin/../lib/gcc/x86_64-linux-android/11.0.1/.=
./../../../x86_64-linux-android/lib/../lib64/libstdc++.so:
undefined reference to `std::ctype<char>::ctype(int*, unsigned short const*,
bool, unsigned long)'
collect2.exe: error: ld returned 1 exit status


Looks like we need actual values.=