Fix implicit declaration of function 'open_temp_exec_file'

https://fedoraproject.org/wiki/Changes/PortingToModernC
https://github.com/libffi/libffi/pull/764

0001-Forward-declare-open_temp_exec_file.patch

@@ -0,0 +1,44 @@
+From ce077e5565366171aa1b4438749b0922fce887a4 Mon Sep 17 00:00:00 2001
+From: serge-sans-paille <serge.guelton@telecom-bretagne.eu>
+Date: Thu, 2 Feb 2023 14:46:29 +0000
+Subject: [PATCH] Forward declare open_temp_exec_file (#764)
+
+It's defined in closures.c and used in tramp.c.
+Also declare it as an hidden symbol, as it should be.
+
+Co-authored-by: serge-sans-paille <sguelton@mozilla.com>
+---
+ include/ffi_common.h | 4 ++++
+ src/tramp.c          | 4 ++++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/include/ffi_common.h b/include/ffi_common.h
+index 2bd31b03d..c53a79493 100644
+--- a/include/ffi_common.h
++++ b/include/ffi_common.h
+@@ -128,6 +128,10 @@ void *ffi_data_to_code_pointer (void *data) FFI_HIDDEN;
+    static trampoline. */
+ int ffi_tramp_is_present (void *closure) FFI_HIDDEN;
+ 
++/* Return a file descriptor of a temporary zero-sized file in a
++   writable and executable filesystem. */
++int open_temp_exec_file(void) FFI_HIDDEN;
++
+ /* Extended cif, used in callback from assembly routine */
+ typedef struct
+ {
+diff --git a/src/tramp.c b/src/tramp.c
+index 7e005b054..5f19b557f 100644
+--- a/src/tramp.c
++++ b/src/tramp.c
+@@ -39,6 +39,10 @@
+ #ifdef __linux__
+ #define _GNU_SOURCE 1
+ #endif
++
++#include <ffi.h>
++#include <ffi_common.h>
++
+ #include <stdio.h>
+ #include <unistd.h>
+ #include <stdlib.h>

libffi.spec

@@ -13,6 +13,10 @@ Source0:	https://github.com/libffi/libffi/releases/download/v3.4.4/libffi-3.4.4.
 Source1:	ffi-multilib.h
 Source2:	ffitarget-multilib.h
 
+# error: implicit declaration of function 'open_temp_exec_file'
+# https://github.com/libffi/libffi/pull/764
+Patch0:		0001-Forward-declare-open_temp_exec_file.patch
+
 BuildRequires: make
 BuildRequires: gcc
 %if %{without bootstrap}