[Buildroot] [PATCH v3 1/2] package/gcc/15.2.0: fix build with glibc 2.43

[Bernd Kuhls <bernd@kuhls.net>]

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
v3: fix format error
v2: no changes

 ...mp-Fix-GCC-build-after-glibc-cd748a6.patch | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 package/gcc/15.2.0/0004-libgomp-Fix-GCC-build-after-glibc-cd748a6.patch

diff --git a/package/gcc/15.2.0/0004-libgomp-Fix-GCC-build-after-glibc-cd748a6.patch b/package/gcc/15.2.0/0004-libgomp-Fix-GCC-build-after-glibc-cd748a6.patch
new file mode 100644
index 0000000000..e24c4dd57e
--- /dev/null
+++ b/package/gcc/15.2.0/0004-libgomp-Fix-GCC-build-after-glibc-cd748a6.patch
@@ -0,0 +1,77 @@
+From 9c9d3aef2f66625d9cb03ef4baee10ed6648e681 Mon Sep 17 00:00:00 2001
+From: Frank Scheiner <frank.scheiner@web.de>
+Date: Tue, 25 Nov 2025 16:58:23 -0700
+Subject: [PATCH] [PATCH] libgomp: Fix GCC build after glibc@cd748a6
+
+The toolchain autobuilds for ia64 failed ([1]) yesterday with:
+
+```
+libtool: compile:  /usr/src/t2-src/src.gcc.ia64-toolchain.251121.040147.278918/gcc-16-20251116/objs/gcc/xgcc-wrapper /usr/src/t2-src/src.gcc.ia64-toolchain.251121.040147.278918/gcc-16-20251116/objs/./gcc/xgcc -B/usr/src/t2-src/src.gcc.ia64-toolchain.251121.040147.278918/gcc-16-20251116/objs/./gcc/ -B/usr/src/t2-src/build/ia64-toolchain-24-svn-generic-ia64-itanium2-cross-linux/TOOLCHAIN/cross/usr/ia64-t2-linux-gnu/bin/ -B/usr/src/t2-src/build/ia64-toolchain-24-svn-generic-ia64-itanium2-cross-linux/TOOLCHAIN/cross/usr/ia64-t2-linux-gnu/lib/ -isystem /usr/src/t2-src/build/ia64-toolchain-24-svn-generic-ia64-itanium2-cross-linux/TOOLCHAIN/cross/usr/ia64-t2-linux-gnu/include -isystem /usr/src/t2-src/build/ia64-toolchain-24-svn-generic-ia64-itanium2-cross-linux/TOOLCHAIN/cross/usr/ia64-t2-linux-gnu/sys-include --sysroot=/usr/src/t2-src/build/ia64-toolchain-24-svn-generic-ia64-itanium2-cross-linux -DHAVE_CONFIG_H -I. -I../../../libgomp -I../../../libgomp/config/linux/ia64 -I../../../libgomp
 /config/linux -I../../../libgomp/config/posix -I../../../libgomp -I../../../libgomp/../include -Wall -Werror -ftls-model=initial-exec -pthread -DUSING_INITIAL_EXEC_TLS -g -O2 -MT oacc-cuda.lo -MD -MP -MF .deps/oacc-cuda.Tpo -c ../../../libgomp/oacc-cuda.c -o oacc-cuda.o >/dev/null 2>&1
+../../../libgomp/affinity-fmt.c: In function 'gomp_display_affinity':
+../../../libgomp/affinity-fmt.c:330:25: error: initialization discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
+  330 |               char *q = strchr (p + 1, '}');
+      |                         ^~~~~~
+```
+
+[1]: https://github.com/johnny-mnemonic/toolchain-autobuilds/actions/runs/19559235881
+
+This is not ia64-specific but due to the changes in the recent glibc
+commit "Implement C23 const-preserving standard library macros" (i.e.
+[2]) now requiring "char *q" to be a pointer to a const char to compile
+w/o error because of the return value of strchr() .
+
+[2]: https://sourceware.org/git/?p=glibc.git;a=commit;h=cd748a63ab1a7ae846175c532a3daab341c62690
+
+Also see the related discussion at [3] for details.
+
+[3]: https://sourceware.org/pipermail/libc-alpha/2025-November/172809.html
+
+The GCC build is fixed by the attached patch, see [4] for a successful
+build with the then latest snapshots of binutils, glibc and GCC.
+
+[4]: https://github.com/johnny-mnemonic/toolchain-autobuilds/actions/runs/19585045571
+
+Idea from Tomas, attached patch from me.
+
+Cheers,
+Frank
+
+0001-libgomp-Fix-GCC-build-after-glibc-cd748a6.patch
+
+From 80af9c233c694904174b54a59404d311378f41f8 Mon Sep 17 00:00:00 2001
+From: Frank Scheiner <frank.scheiner@web.de>
+Date: Sat, 22 Nov 2025 14:58:10 +0100
+Subject: [PATCH] libgomp: Fix GCC build after glibc@cd748a6
+
+char *q needs to be a pointer to a const char for the return value of
+strchr() with glibc after "Implement C23 const-preserving standard library
+macros".
+
+[glibc@cd748a6]: https://sourceware.org/git/?p=glibc.git;a=commit;h=cd748a63ab1a7ae846175c532a3daab341c62690
+
+libgomp/ChangeLog:
+	* affinity-fmt.c: Make char *q a pointer to a const char.
+
+Upstream: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=9c9d3aef2f66625d9cb03ef4baee10ed6648e681
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ libgomp/affinity-fmt.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libgomp/affinity-fmt.c b/libgomp/affinity-fmt.c
+index 1fae893cbaca..8d3df5f1cd55 100644
+--- a/libgomp/affinity-fmt.c
++++ b/libgomp/affinity-fmt.c
+@@ -327,7 +327,7 @@ gomp_display_affinity (char *buffer, size_t size,
+ 	      }
+ 	  if (c == '{')
+ 	    {
+-	      char *q = strchr (p + 1, '}');
++	      const char *q = strchr (p + 1, '}');
+ 	      if (q)
+ 		gomp_fatal ("unsupported long type name '%.*s' in affinity "
+ 			    "format", (int) (q - (p + 1)), p + 1);
+-- 
+2.43.7
+
-- 
2.47.3

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