linux (Generic): backport patches from 6.14 Use std-gnu11 to fix build with GCC-15

projects/Generic/patches/linux/0001-x86-boot-Use-std-gnu11-to-fix-build-with-GCC-15.patch

@@ -0,0 +1,52 @@
+From d958328c685e36d47032960ee7f706120b280ee4 Mon Sep 17 00:00:00 2001
+From: Nathan Chancellor <nathan@kernel.org>
+Date: Tue, 21 Jan 2025 18:11:33 -0700
+Subject: [PATCH 1/2] x86/boot: Use '-std=gnu11' to fix build with GCC 15
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+GCC 15 changed the default C standard version to C23, which should not
+have impacted the kernel because it requests the gnu11 standard via
+'-std=' in the main Makefile. However, the x86 compressed boot Makefile
+uses its own set of KBUILD_CFLAGS without a '-std=' value (i.e., using
+the default), resulting in errors from the kernel's definitions of bool,
+true, and false in stddef.h, which are reserved keywords under C23.
+
+  ./include/linux/stddef.h:11:9: error: expected identifier before ‘false’
+     11 |         false   = 0,
+  ./include/linux/types.h:35:33: error: two or more data types in declaration specifiers
+     35 | typedef _Bool                   bool;
+
+Set '-std=gnu11' in the x86 compressed boot Makefile to resolve the
+error and consistently use the same C standard version for the entire
+kernel.
+
+Closes: https://lore.kernel.org/4OAhbllK7x4QJGpZjkYjtBYNLd_2whHx9oFiuZcGwtVR4hIzvduultkgfAIRZI3vQpZylu7Gl929HaYFRGeMEalWCpeMzCIIhLxxRhq4U-Y=@protonmail.com/
+Closes: https://lore.kernel.org/Z4467umXR2PZ0M1H@tucnak/
+Reported-by: Kostadin Shishmanov <kostadinshishmanov@protonmail.com>
+Reported-by: Jakub Jelinek <jakub@redhat.com>
+Signed-off-by: Nathan Chancellor <nathan@kernel.org>
+Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
+Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
+Cc:stable@vger.kernel.org
+Link: https://lore.kernel.org/all/20250121-x86-use-std-consistently-gcc-15-v1-1-8ab0acf645cb%40kernel.org
+---
+ arch/x86/boot/compressed/Makefile | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
+index f2051644de94..606c74f27459 100644
+--- a/arch/x86/boot/compressed/Makefile
++++ b/arch/x86/boot/compressed/Makefile
+@@ -25,6 +25,7 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
+ # avoid errors with '-march=i386', and future flags may depend on the target to
+ # be valid.
+ KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
++KBUILD_CFLAGS += -std=gnu11
+ KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
+ KBUILD_CFLAGS += -Wundef
+ KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
+-- 
+2.43.0
+

projects/Generic/patches/linux/0002-efi-libstub-Use-std-gnu11-to-fix-build-with-GCC-15.patch

@@ -0,0 +1,52 @@
+From 0c157e7a64470c450f6032fcfe7720568fb1b237 Mon Sep 17 00:00:00 2001
+From: Nathan Chancellor <nathan@kernel.org>
+Date: Tue, 21 Jan 2025 18:11:34 -0700
+Subject: [PATCH 2/2] efi: libstub: Use '-std=gnu11' to fix build with GCC 15
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+GCC 15 changed the default C standard version to C23, which should not
+have impacted the kernel because it requests the gnu11 standard via
+'-std=' in the main Makefile. However, the EFI libstub Makefile uses its
+own set of KBUILD_CFLAGS for x86 without a '-std=' value (i.e., using
+the default), resulting in errors from the kernel's definitions of bool,
+true, and false in stddef.h, which are reserved keywords under C23.
+
+  ./include/linux/stddef.h:11:9: error: expected identifier before ‘false’
+     11 |         false   = 0,
+  ./include/linux/types.h:35:33: error: two or more data types in declaration specifiers
+     35 | typedef _Bool                   bool;
+
+Set '-std=gnu11' in the x86 cflags to resolve the error and consistently
+use the same C standard version for the entire kernel. All other
+architectures reuse KBUILD_CFLAGS from the rest of the kernel, so this
+issue is not visible for them.
+
+Cc: stable@vger.kernel.org
+Reported-by: Kostadin Shishmanov <kostadinshishmanov@protonmail.com>
+Closes: https://lore.kernel.org/4OAhbllK7x4QJGpZjkYjtBYNLd_2whHx9oFiuZcGwtVR4hIzvduultkgfAIRZI3vQpZylu7Gl929HaYFRGeMEalWCpeMzCIIhLxxRhq4U-Y=@protonmail.com/
+Reported-by: Jakub Jelinek <jakub@redhat.com>
+Closes: https://lore.kernel.org/Z4467umXR2PZ0M1H@tucnak/
+Signed-off-by: Nathan Chancellor <nathan@kernel.org>
+Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
+---
+ drivers/firmware/efi/libstub/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
+index ed4e8ddbe76a..1141cd06011f 100644
+--- a/drivers/firmware/efi/libstub/Makefile
++++ b/drivers/firmware/efi/libstub/Makefile
+@@ -11,7 +11,7 @@ cflags-y			:= $(KBUILD_CFLAGS)
+ 
+ cflags-$(CONFIG_X86_32)		:= -march=i386
+ cflags-$(CONFIG_X86_64)		:= -mcmodel=small
+-cflags-$(CONFIG_X86)		+= -m$(BITS) -D__KERNEL__ \
++cflags-$(CONFIG_X86)		+= -m$(BITS) -D__KERNEL__ -std=gnu11 \
+ 				   -fPIC -fno-strict-aliasing -mno-red-zone \
+ 				   -mno-mmx -mno-sse -fshort-wchar \
+ 				   -Wno-pointer-sign \
+-- 
+2.43.0
+