git: 0c397ecd5df6 - main - lang/gcc15-devel: Fix SIGBUS depending on CPUTYPE

The branch main has been updated by salvadore:

URL: https://cgit.FreeBSD.org/ports/commit/?id=0c397ecd5df61ac9258943c9f465ba7f937b0a93

commit 0c397ecd5df61ac9258943c9f465ba7f937b0a93
Author:     Lorenzo Salvadore <salvadore@FreeBSD.org>
AuthorDate: 2025-04-15 12:27:38 +0000
Commit:     Lorenzo Salvadore <salvadore@FreeBSD.org>
CommitDate: 2025-04-16 13:20:40 +0000

    lang/gcc15-devel: 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/gcc15-devel/Makefile                      |  1 +
 lang/gcc15-devel/files/patch-libgcc_unwind.inc | 28 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/lang/gcc15-devel/Makefile b/lang/gcc15-devel/Makefile
index 695c2ebb7552..5caf32b24cd0 100644
--- a/lang/gcc15-devel/Makefile
+++ b/lang/gcc15-devel/Makefile
@@ -1,5 +1,6 @@
 PORTNAME=	gcc
 PORTVERSION=	15.0.1.s20250413
+PORTREVISION=	1
 CATEGORIES=	lang
 MASTER_SITES=	GCC/snapshots/${DIST_VERSION}
 PKGNAMESUFFIX=	${SUFFIX}-devel
diff --git a/lang/gcc15-devel/files/patch-libgcc_unwind.inc b/lang/gcc15-devel/files/patch-libgcc_unwind.inc
new file mode 100644
index 000000000000..42155a9ba48e
--- /dev/null
+++ b/lang/gcc15-devel/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)