Avoid multiply-defined symbols that lead to link errors such as:
ld: libcamlrund.a(backtrace_bd.o):/tmp/guix-build-ocaml-4.09.0.drv-0/ocaml-4.09.0/runtime/backtrace.c:31: multiple definition of `caml_debug_info'; libcamlrund.a(backtrace_byt_bd.o):/tmp/guix-build-ocaml-4.09.0.drv-0/ocaml-4.09.0/runtime/backtrace_byt.c:47: first defined here
diff --git a/runtime/backtrace.c b/runtime/backtrace.c
index a3c2c08..f57c81c 100644
--- a/runtime/backtrace.c
+++ b/runtime/backtrace.c
@@ -28,7 +28,7 @@
#include "caml/fail.h"
/* The table of debug information fragments */
-struct ext_table caml_debug_info;
+static struct ext_table caml_debug_info;
CAMLexport int32_t caml_backtrace_active = 0;
CAMLexport int32_t caml_backtrace_pos = 0;
diff --git a/runtime/backtrace_byt.c b/runtime/backtrace_byt.c
index b913dac..b5ec926 100644
--- a/runtime/backtrace_byt.c
+++ b/runtime/backtrace_byt.c
@@ -44,7 +44,7 @@
#include "caml/backtrace_prim.h"
/* The table of debug information fragments */
-struct ext_table caml_debug_info;
+static struct ext_table caml_debug_info;
CAMLexport char_os * caml_cds_file = NULL;
diff --git a/runtime/startup_nat.c b/runtime/startup_nat.c
index b4e6bc4..7eca5fa 100644
--- a/runtime/startup_nat.c
+++ b/runtime/startup_nat.c
@@ -44,6 +44,5 @@
#endif
extern int caml_parser_trace;
-CAMLexport header_t caml_atom_table[256];
char * caml_code_area_start, * caml_code_area_end;
struct ext_table caml_code_fragments_table;
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