From 36d5e26f606e070553eb0fff1f738e61970be5d7 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 9 Mar 2022 20:22:20 -0800
Subject: [PATCH] sigsegv: Fix build on ppc/musl

mcontext is not a standard layout so glibc and musl differ sadly.

Fixes
../../m4-1.4.19/lib/sigsegv.c: In function 'sigsegv_handler':                                                                                                                               ../../m4-1.4.19/lib/sigsegv.c:223:75: error: 'mcontext_t' has no member named 'uc_regs'; did you mean 'gregs'?                                                                                223 | #    define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.uc_regs->gregs[1]                                                                                               |                                                                           ^~~~~~~

Upstream-Status: Submitted [https://lists.gnu.org/archive/html/m4-patches/2022-03/msg00000.html]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 lib/sigsegv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/sigsegv.c b/lib/sigsegv.c
index 696a152..fa0c465 100644
--- a/lib/sigsegv.c
+++ b/lib/sigsegv.c
@@ -217,10 +217,10 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
 #   define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.gp_regs[1]
 #  else /* 32-bit */
 /* both should be equivalent */
-#   if 0
-#    define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.regs->gpr[1]
+#   if ! defined __GLIBC__
+#      define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_regs->gregs[1]
 #   else
-#    define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.uc_regs->gregs[1]
+#      define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.uc_regs->gregs[1]
 #   endif
 #  endif
 
-- 
2.35.1