From caf81d3b57501b1f58dcd9b1ef9d7b4bc76f4ab1 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Tue, 17 Aug 2021 09:53:43 +0200 Subject: [PATCH] Use __builtin_trap() for abort() if inhibit_libc abort() is used in gcc_assert() and gcc_unreachable() which is used by target libraries such as libgcov.a. This patch changes the abort() definition under certain conditions. If inhibit_libc is defined and abort is not already defined, then abort() is defined to __builtin_trap(). The inhibit_libc define is usually defined if GCC is built for targets running in embedded systems which may optionally use a C standard library. If inhibit_libc is defined, then there may be still a full featured abort() available. abort() is a heavy weight function which depends on signals and file streams. For statically linked applications, this means that a dependency on gcc_assert() pulls in the support for signals and file streams. This could prevent using gcov to test low end targets for example. Using __builtin_trap() avoids these dependencies if the target implements a "trap" instruction. The application or operating system could use a trap handler to react to failed GCC runtime checks which caused a trap. gcc/ * tsystem.h (abort): Define abort() if inhibit_libc is defined and it is not already defined. --- gcc/tsystem.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/tsystem.h b/gcc/tsystem.h index e1e6a96a4f4..5c72c69ff3e 100644 --- a/gcc/tsystem.h +++ b/gcc/tsystem.h @@ -59,7 +59,7 @@ extern int atexit (void (*)(void)); #endif #ifndef abort -extern void abort (void) __attribute__ ((__noreturn__)); +#define abort() __builtin_trap () #endif #ifndef strlen