Allow third party sigsegv handler

For example from sanitizers.

1 files changed, 1 insertions, 0 deletions

diff --git a/CRT.h b/CRT.h
index 8a5d6ac6..32992e41 100644
--- a/CRT.h
+++ b/CRT.h
@@ -108,6 +108,7 @@ typedef enum ColorElements_ {
 
 void CRT_fatalError(const char* note) __attribute__ ((noreturn));
 
+extern struct sigaction old_sigsegv_handler;
 void CRT_handleSIGSEGV(int sgn);
 
 #define KEY_ALT(x) (KEY_F(64 - 26) + (x - 'A'))