coreboot: Add patch to fix build with GCC 15 as host compiler

Building coreboot host tools with GCC 15 results in build errors:

  In file included from .../lbmk/src/coreboot/default/util/cbfstool/console/console.h:7,
                   from .../lbmk/src/coreboot/default/src/commonlib/fsp_relocate.c:3:
  .../lbmk/src/coreboot/default/src/commonlib/include/commonlib/loglevel.h:170:26: error: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (6 chars into 5 available) [-Werror=unterminated-string-initialization]
    170 |         [BIOS_EMERG]   = "EMERG",
        |                          ^~~~~~~
  .../lbmk/src/coreboot/default/src/commonlib/include/commonlib/loglevel.h:171:26: error: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (6 chars into 5 available) [-Werror=unterminated-string-initialization]
    171 |         [BIOS_ALERT]   = "ALERT",
        |                          ^~~~~~~
  [...]
  ../cbfstool/common.c: In function 'bintohex':
  ../cbfstool/common.c:195:43: error: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (17 chars into 16 available) [-Werror=unterminated-string-initialization]
    195 |         static const char translate[16] = "0123456789abcdef";
        |                                           ^~~~~~~~~~~~~~~~~~

Add a patch that marks the latter with the "nonstring" attribute, and
disable the warning for the former because I couldn't figure out how to
add that attribute there.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/config/coreboot/default/patches/0040-Fix-build-with-GCC-15-as-host-compiler.patch b/config/coreboot/default/patches/0040-Fix-build-with-GCC-15-as-host-compiler.patch
new file mode 100644
index 00000000..a7b28f2e
--- /dev/null
+++ b/config/coreboot/default/patches/0040-Fix-build-with-GCC-15-as-host-compiler.patch
@@ -0,0 +1,62 @@
+From 281151d85240bd8a60545b6415e0f44ce6a2af33 Mon Sep 17 00:00:00 2001
+From: Alper Nebi Yasak <alpernebiyasak@gmail.com>
+Date: Tue, 29 Apr 2025 17:31:13 +0300
+Subject: [PATCH] WIP: Fix build with GCC 15 as host compiler
+
+GCC 15 now considers the unterminated-string-initialization warning as
+part of -Werror by default. Coreboot compiles host utilities with the
+system compiler, which results in getting this error in some files.
+
+Mark a hexadecimal translation table in cbfstool code as "nonstring" to
+avoid the warning-turned-error.
+
+The bios log prefixes are non-null-terminated as well, but I couldn't
+figure out how to mark them as non-strings. Temporarily disable the
+warning with a pragma to avoid the error. That pragma causes an error on
+GCC 14, so disable pragma warnings along with it to avoid that as well.
+
+Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
+---
+ src/commonlib/include/commonlib/loglevel.h | 4 ++++
+ util/cbfstool/common.c                     | 2 +-
+ 2 files changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/src/commonlib/include/commonlib/loglevel.h b/src/commonlib/include/commonlib/loglevel.h
+index 79fbcfc6d92b..31438c945ff5 100644
+--- a/src/commonlib/include/commonlib/loglevel.h
++++ b/src/commonlib/include/commonlib/loglevel.h
+@@ -163,6 +163,9 @@
+  * When printing logs, lines should be printed with the following prefixes in
+  * front of them according to the BIOS_LOG_PREFIX_PATTERN printf() pattern.
+  */
++#pragma GCC diagnostic push
++#pragma GCC diagnostic ignored "-Wpragmas"
++#pragma GCC diagnostic ignored "-Wunterminated-string-initialization"
+ #define BIOS_LOG_PREFIX_PATTERN "[%.5s]  "
+ #define BIOS_LOG_PREFIX_MAX_LEVEL BIOS_SPEW
+ static const char bios_log_prefix[BIOS_LOG_PREFIX_MAX_LEVEL + 1][5] = {
+@@ -177,6 +180,7 @@ static const char bios_log_prefix[BIOS_LOG_PREFIX_MAX_LEVEL + 1][5] = {
+ 	[BIOS_DEBUG]   = "DEBUG",
+ 	[BIOS_SPEW]    = "SPEW ",
+ };
++#pragma GCC diagnostic pop
+ 
+ /*
+  * When printing to terminals supporting ANSI escape sequences, the following
+diff --git a/util/cbfstool/common.c b/util/cbfstool/common.c
+index 7154bc9d5425..cb08c9e8ec11 100644
+--- a/util/cbfstool/common.c
++++ b/util/cbfstool/common.c
+@@ -192,7 +192,7 @@ uint64_t intfiletype(const char *name)
+ 
+ char *bintohex(uint8_t *data, size_t len)
+ {
+-	static const char translate[16] = "0123456789abcdef";
++	static const char translate[16] __attribute__((__nonstring__)) = "0123456789abcdef";
+ 
+ 	char *result = malloc(len * 2 + 1);
+ 	if (result == NULL)
+
+-- 
+2.49.0
+