modules/linux: ppc64 gcc 15.1 fixes (TODO: verify all needed?)

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

Author: tlaurion

modules/linux

@@ -145,6 +145,18 @@ ifeq "$(CONFIG_LINUX_VERSION)" "4.14.62"
 EXTRA_FLAGS += -Wno-cast-function-type
 endif
 
+# PowerPC specific alignment fixes for GCC 15.1.0
+ifeq "$(CONFIG_TARGET_ARCH)" "ppc64"
+# Comprehensive GCC 15.1.0 PowerPC compatibility flags
+EXTRA_FLAGS += -fno-stack-protector
+EXTRA_FLAGS += -O1
+EXTRA_FLAGS += -fno-schedule-insns -fno-schedule-insns2
+EXTRA_FLAGS += -fno-reorder-blocks
+EXTRA_FLAGS += -fno-tree-vectorize
+# Force GNU C11 for PowerPC boot code to avoid C23 bool keyword conflicts
+EXTRA_FLAGS += -std=gnu11
+endif
+
 linux_target := \
 	O="$(build)/$(linux_dir)" \
 	ARCH="$(LINUX_ARCH)" \

patches/linux-6.6.16-openpower/0008-powerpc-boot-Fix-C23-bool-compatibility-for-GCC-15.patch

@@ -0,0 +1,11 @@
+--- a/arch/powerpc/boot/Makefile	2025-08-19 18:11:03.942092926 +0000
++++ b/arch/powerpc/boot/Makefile	2025-08-19 18:11:03.943875445 +0000
+@@ -79,7 +79,7 @@
+ 		   $(call cc-option,-mno-pcrel) \
+ 		   $(call cc-option,-mno-mma) \
+ 		   $(call cc-option,-mno-spe) $(call cc-option,-mspe=no) \
+-		   -fomit-frame-pointer -fno-builtin -fPIC
++		   -fomit-frame-pointer -fno-builtin -fPIC -std=gnu11
+ 
+ BOOTAFLAGS	:= $(BOOTTARGETFLAGS) -D__ASSEMBLY__
+