Don't directly include zend_jit_gdb.c

Compile the file separately and only include a header. There doesn't
seem to be a good reason to directly include the C file here, and
this ensures that there are no symbol clashes (see GH-7197).

ext/opcache/config.m4

@@ -40,7 +40,7 @@ if test "$PHP_OPCACHE" != "no"; then
 
   if test "$PHP_OPCACHE_JIT" = "yes"; then
     AC_DEFINE(HAVE_JIT, 1, [Define to enable JIT])
-    ZEND_JIT_SRC="jit/zend_jit.c jit/zend_jit_vm_helpers.c"
+    ZEND_JIT_SRC="jit/zend_jit.c jit/zend_jit_gdb.c jit/zend_jit_vm_helpers.c"
 
     dnl Find out which ABI we are using.
     case $host_alias in

ext/opcache/jit/zend_jit.c

@@ -678,7 +678,7 @@ static int zend_jit_add_veneer(dasm_State *Dst, void *buffer, uint32_t ins, int
 #include "jit/zend_jit_helpers.c"
 #include "jit/zend_jit_disasm.c"
 #ifndef _WIN32
-# include "jit/zend_jit_gdb.c"
+# include "jit/zend_jit_gdb.h"
 # include "jit/zend_jit_perf_dump.c"
 #endif
 #ifdef HAVE_OPROFILE

ext/opcache/jit/zend_jit_gdb.c

@@ -23,6 +23,7 @@
 
 #define HAVE_GDB
 
+#include "zend_jit_gdb.h"
 #include "zend_elf.h"
 #include "zend_gdb.h"
 
@@ -484,12 +485,12 @@ static void zend_gdbjit_buildobj(zend_gdbjit_ctx *ctx, uint32_t sp_offset, uint3
 	ZEND_ASSERT(ctx->objsize < sizeof(zend_gdbjit_obj));
 }
 
-static int zend_jit_gdb_register(const char    *name,
-                                 const zend_op_array *op_array,
-                                 const void    *start,
-                                 size_t         size,
-                                 uint32_t       sp_offset,
-                                 uint32_t       sp_adjustment)
+int zend_jit_gdb_register(const char    *name,
+                          const zend_op_array *op_array,
+                          const void    *start,
+                          size_t         size,
+                          uint32_t       sp_offset,
+                          uint32_t       sp_adjustment)
 {
 	zend_gdbjit_ctx ctx;
 
@@ -504,13 +505,13 @@ static int zend_jit_gdb_register(const char    *name,
 	return zend_gdb_register_code(&ctx.obj, ctx.objsize);
 }
 
-static int zend_jit_gdb_unregister(void)
+int zend_jit_gdb_unregister(void)
 {
 	zend_gdb_unregister_all();
 	return 1;
 }
 
-static void zend_jit_gdb_init(void)
+void zend_jit_gdb_init(void)
 {
 #if 0
 	/* This might enable registration of all JIT-ed code, but unfortunately,

ext/opcache/jit/zend_jit_gdb.h

@@ -0,0 +1,37 @@
+/*
+   +----------------------------------------------------------------------+
+   | Zend JIT                                                             |
+   +----------------------------------------------------------------------+
+   | Copyright (c) The PHP Group                                          |
+   +----------------------------------------------------------------------+
+   | This source file is subject to version 3.01 of the PHP license,      |
+   | that is bundled with this package in the file LICENSE, and is        |
+   | available through the world-wide-web at the following url:           |
+   | https://www.php.net/license/3_01.txt                                 |
+   | If you did not receive a copy of the PHP license and are unable to   |
+   | obtain it through the world-wide-web, please send a note to          |
+   | license@php.net so we can mail you a copy immediately.               |
+   +----------------------------------------------------------------------+
+   | Authors: Dmitry Stogov <dmitry@php.net>                              |
+   |          Xinchen Hui <laruence@php.net>                              |
+   +----------------------------------------------------------------------+
+*/
+
+#ifndef HAVE_ZEND_JIT_GDB_H
+#define HAVE_ZEND_JIT_GDB_H
+
+#include "zend_compile.h"
+
+#define HAVE_GDB
+
+int zend_jit_gdb_register(const char    *name,
+                          const zend_op_array *op_array,
+                          const void    *start,
+                          size_t         size,
+                          uint32_t       sp_offset,
+                          uint32_t       sp_adjustment);
+
+int zend_jit_gdb_unregister(void);
+void zend_jit_gdb_init(void);
+
+#endif /* HAVE_ZEND_JIT_GDB_H */