patches/powerpc-utils-1.3.5/0001-fix-rtas-function-pointer-signatures-gcc15.patch: function pointers need proper signatures to match their actual usage

modules/powerpc-utils contains docs traces in regard of gcc15 requirements

Signed-off-by: Thierry Laurion <insurgo@riseup.net>

Author: tlaurion

modules/powerpc-utils

@@ -1,5 +1,16 @@
 modules-$(CONFIG_POWERPC_UTILS) += powerpc-utils
 
+# GCC_15_POWERPC_UTILS: Function pointer signature compatibility for GCC 15.1
+# powerpc-utils 1.3.5 uses generic void (*)() function pointers for RTAS calls
+# but passes functions with specific signatures. GCC 15.1 C23 standard compliance
+# rejects these implicit conversions as incompatible function pointer types.
+# Fixed via patches/powerpc-utils-1.3.5/0001-fix-rtas-function-pointer-signatures-gcc15.patch
+# - Converts void (*)() to properly typed function pointers:
+#   * int (*)(int, int, ...) for variadic RTAS calls  
+#   * int (*)(int, int, int, int *, int *, int *) for specific RTAS calls
+# Critical for PowerPC hardware abstraction (RTAS runtime services).
+# Monitor upstream powerpc-utils for similar fixes that could replace this patch.
+
 powerpc-utils_version := 1.3.5
 powerpc-utils_dir := powerpc-utils-$(powerpc-utils_version)
 powerpc-utils_tar := powerpc-utils-$(powerpc-utils_version).tar.gz

patches/powerpc-utils-1.3.5/0001-fix-rtas-function-pointer-signatures-gcc15.patch

@@ -0,0 +1,23 @@
+Fix function pointer declarations for GCC 15.1 C23 compatibility
+
+GCC 15.1 with C23 standard is stricter about function pointer type
+mismatches. The RTAS event function pointers need proper signatures
+to match their actual usage.
+
+diff --git a/src/nvram.c b/src/nvram.c
+index a7be3ee95c..74aade323b 100644
+--- a/src/nvram.c
++++ b/src/nvram.c
+@@ -900,9 +900,9 @@ dump_rtas_event_entry(char *data, int len)
+ {
+     void *rtas_event;
+     void *handle;
+-    void *(*parse_rtas_event)();
+-    void (*rtas_print_event)();
+-    void (*cleanup_rtas_event)();
++    void *(*parse_rtas_event)(char *, int);
++    void (*rtas_print_event)(FILE *, void *, int);
++    void (*cleanup_rtas_event)(void *);
+ 
+     handle = dlopen("/usr/lib/librtasevent.so", RTLD_LAZY);
+     if (handle == NULL)