Nonbootstrap build with Apple clang broken in gm2

[FX Coudert]

Hi,

I am unable to perform a nonbootstrap build when gm2 is included, with Apple clang 15 as compiler. The error is due to incorrect inclusion of headers (<string> and <vector>) which are included after GCC’s system.h has been included, and macros like abort() are redefined or poisoned.

I think the correct idiom in GCC is to #define INCLUDE_STRING (for example) before “system.h” is included, rather than #include <string> directly. The attached patch fixes the issue.

Best,
FX

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