[PATCH] Include safe-ctype.h after C++ standard headers, to avoid over-poisoning

[Sam James]

FX Coudert <fxcoudert@gmail.com> writes:

> I would like to patch this patch from September 2023:
> https://gcc.gnu.org/pipermail/gcc-patches/2023-September/631611.html
>
> This bug is now hitting macOS in the latest version of Xcode (it was originally seen on freebsd).
> I confirm that the patch is restoring bootstrap on x86_64-apple-darwin23

Iain hit an issue with it and I never got a chance to look into how to
fix it.

>
> OK to push?
> FX
>
>
>
>
>
>> Ref: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111632
>> 
>> When building gcc's C++ sources against recent libc++, the poisoning of
>> the ctype macros due to including safe-ctype.h before including C++
>> standard headers such as <list>, <map>, etc, causes many compilation
>> errors, similar to:
>> 
>> In file included from /home/dim/src/gcc/master/gcc/gensupport.cc:23:
>> In file included from /home/dim/src/gcc/master/gcc/system.h:233:
>> In file included from /usr/include/c++/v1/vector:321:
>> In file included from
>> /usr/include/c++/v1/__format/formatter_bool.h:20:
>> In file included from
>> /usr/include/c++/v1/__format/formatter_integral.h:32:
>> In file included from /usr/include/c++/v1/locale:202:
>> /usr/include/c++/v1/__locale:546:5: error: '__abi_tag__' attribute
>> only applies to structs, variables, functions, and namespaces
>> 546 | _LIBCPP_INLINE_VISIBILITY
>> | ^
>> /usr/include/c++/v1/__config:813:37: note: expanded from macro
>> '_LIBCPP_INLINE_VISIBILITY'
>> 813 | # define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI
>> | ^
>> /usr/include/c++/v1/__config:792:26: note: expanded from macro
>> '_LIBCPP_HIDE_FROM_ABI'
>> 792 |
>> __attribute__((__abi_tag__(_LIBCPP_TOSTRING(
>> _LIBCPP_VERSIONED_IDENTIFIER))))
>> | ^
>> In file included from /home/dim/src/gcc/master/gcc/gensupport.cc:23:
>> In file included from /home/dim/src/gcc/master/gcc/system.h:233:
>> In file included from /usr/include/c++/v1/vector:321:
>> In file included from
>> /usr/include/c++/v1/__format/formatter_bool.h:20:
>> In file included from
>> /usr/include/c++/v1/__format/formatter_integral.h:32:
>> In file included from /usr/include/c++/v1/locale:202:
>> /usr/include/c++/v1/__locale:547:37: error: expected ';' at end of
>> declaration list
>> 547 | char_type toupper(char_type __c) const
>> | ^
>> /usr/include/c++/v1/__locale:553:48: error: too many arguments
>> provided to function-like macro invocation
>> 553 | const char_type* toupper(char_type* __low, const
>> char_type* __high) const
>> | ^
>> /home/dim/src/gcc/master/gcc/../include/safe-ctype.h:146:9: note:
>> macro 'toupper' defined here
>> 146 | #define toupper(c) do_not_use_toupper_with_safe_ctype
>> | ^
>> 
>> This is because libc++ uses different transitive includes than
>> libstdc++, and some of those transitive includes pull in various ctype
>> declarations (typically via <locale>).
>> 
>> There was already a special case for including <string> before
>> safe-ctype.h, so move the rest of the C++ standard header includes to
>> the same location, to fix the problem.
>> 
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