git: 231018e22818 - main - lang/gcc12: Fix SIGBUS depending on CPUTYPE

The branch main has been updated by salvadore:

URL: https://cgit.FreeBSD.org/ports/commit/?id=231018e228187099b8fac7e55b1a662cdc81c1f8

commit 231018e228187099b8fac7e55b1a662cdc81c1f8
Author:     Oleg Sidorkin <osidorkin@gmail.com>
AuthorDate: 2025-04-23 14:36:49 +0000
Commit:     Lorenzo Salvadore <salvadore@FreeBSD.org>
CommitDate: 2025-04-24 12:55:47 +0000

    lang/gcc12: Fix SIGBUS depending on CPUTYPE
    
    Compiling GCC with some CPUTYPE values (e.g. broadwell) result in
    breaking some applications (e.g. math/octave, cad/freecad), sending a
    SIGBUS.
    
    The issue is due to GCC generating instructions that require variables
    to be aligned in memory on certain CPUs. Our libthr does not have the
    required alignment so these CPUs fail to execute these instructions.
    
    The patch disables the generation of such instructions.
    
    PR:             285711
    Reported by:    cracauer
    Tested by:      cracauer, jbo
---
 lang/gcc12/Makefile                      |  2 +-
 lang/gcc12/files/patch-libgcc_unwind.inc | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/lang/gcc12/Makefile b/lang/gcc12/Makefile
index 24e5ad3bb5ea..03aa59736457 100644
--- a/lang/gcc12/Makefile
+++ b/lang/gcc12/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	gcc
 PORTVERSION=	12.4.0
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	lang
 MASTER_SITES=	GCC
 PKGNAMESUFFIX=	${SUFFIX}
diff --git a/lang/gcc12/files/patch-libgcc_unwind.inc b/lang/gcc12/files/patch-libgcc_unwind.inc
new file mode 100644
index 000000000000..42155a9ba48e
--- /dev/null
+++ b/lang/gcc12/files/patch-libgcc_unwind.inc
@@ -0,0 +1,28 @@
+GCC generates instructions that require variables to be aligned in memory on
+certain CPUs. Our libthr does not have the required alignment so these CPUs fail
+to execute these instructions. The instructions generation is driven by CPUTYPE.
+Some CPUs are fine to execute these instructions on unaligned data.
+
+This patch explicitly forbids GCC to generate instructions that require
+alignment of the data.
+
+If the entire program is compiled by LLVM or GCC, there is no problem (with GCC
+everything is aligned, with LLVM vmovdqa is not used to assign both variables
+at once).
+
+Linux does not have libthr, so Linux is not affected. Moreover Linux is likely
+to build everything with GCC.
+
+--- libgcc/unwind.inc.orig	2025-04-12 08:18:17 UTC
++++ libgcc/unwind.inc
+@@ -212,8 +212,8 @@ _Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
+   uw_init_context (&this_context);
+   cur_context = this_context;
+ 
+-  exc->private_1 = (_Unwind_Ptr) stop;
+-  exc->private_2 = (_Unwind_Ptr) stop_argument;
++  __builtin_memcpy(&exc->private_1, &stop, sizeof(_Unwind_Ptr));
++  __builtin_memcpy(&exc->private_2, &stop_argument, sizeof(_Unwind_Ptr));
+ 
+   code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context, &frames);
+   if (code != _URC_INSTALL_CONTEXT)