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Add a new target hook, stack_protect_guard_symbol_p, to support the user provided stack protection guard as a global symbol. If the hook returns true, 1. Declare __stack_chk_guard as a global uintptr_t variable so that it can be initialized as an integer. 2. If the user declared variable matches __stack_chk_guard, merge it with __stack_chk_guard, including its visibility attribute. gcc/ PR c/121911 * target.def (stack_protect_guard_symbol_p): New target hook. * targhooks.cc (default_stack_protect_guard): Use the type of uintptr_t, instead of ptr_type_node, if the stack_protect_guard_symbol_p hook returns true. * config/i386/i386.cc (ix86_stack_protect_guard_symbol_p): New. (TARGET_STACK_PROTECT_GUARD_SYMBOL_P): Likewise. * doc/tm.texi: Regenerated. * doc/tm.texi.in (TARGET_STACK_PROTECT_GUARD_SYMBOL_P): New. gcc/c-family/ PR c/121911 * c-common.cc (c_common_nodes_and_builtins): If the stack_protect_guard_symbol_p hook returns true, declare a global symbol for stack protection guard. gcc/testsuite/ PR c/121911 * g++.target/i386/ssp-global-1.C: New test. * g++.target/i386/ssp-global-2.C: Likewise. * g++.target/i386/ssp-global-3.C: Likewise. * g++.target/i386/ssp-global-hidden-1.C: Likewise. * g++.target/i386/ssp-global-hidden-2.C: Likewise. * g++.target/i386/ssp-global-hidden-3.C: Likewise. * gcc.target/i386/ssp-global-2.c: Likewise. * gcc.target/i386/ssp-global-3.c: Likewise. * gcc.target/i386/ssp-global-4.c: Likewise. * gcc.target/i386/ssp-global-hidden-1.c: Likewise. * gcc.target/i386/ssp-global-hidden-2.c: Likewise. * gcc.target/i386/ssp-global-hidden-3.c: Likewise. * gcc.target/i386/ssp-global.c: Include <stdint.h>. (__stack_chk_guard): Change its type to uintptr_t. Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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