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The GCC compiler that comes with rust-mingw understands -fstack-protector-strong and emits stack-protector code, but the build further fails to link with messages like:
C:\Users\task_1581171456\repo\git-core\libcinnabar.a(cinnabar-fast-import.o):cinnabar-fast-import.c:(.text+0x291): undefined reference to `__stack_chk_fail'
The missing symbol is normally added by gcc to the ld command line via -lssp_nonshared -lssp, when it's passed -fstack-protector-strong during linking. Adding -fstack-protector-strong via RUSTFLAGS=-Clink-arg=-fstack-protector-strong doesn't actually work because of -nostdlib that rust adds on its own, but RUSTFLAGS=-Clink-arg=-lssp_nonshared -Clink-arg=-lssp doesn't work either because libssp* is not provided by rust-mingw.
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