[PATCH v2] m4: Fix build on musl/ppc

[PATCH v2] m4: Fix build on musl/ppc

[Khem Raj]

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
v2: Update patch status

 meta/recipes-devtools/m4/m4-1.4.19.inc        |  1 +
 .../0001-sigsegv-Fix-build-on-ppc-musl.patch  | 37 +++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 meta/recipes-devtools/m4/m4/0001-sigsegv-Fix-build-on-ppc-musl.patch

diff --git a/meta/recipes-devtools/m4/m4-1.4.19.inc b/meta/recipes-devtools/m4/m4-1.4.19.inc
index 2785a3d22cd..2adf4de6f2f 100644
--- a/meta/recipes-devtools/m4/m4-1.4.19.inc
+++ b/meta/recipes-devtools/m4/m4-1.4.19.inc
@@ -8,6 +8,7 @@ inherit autotools texinfo ptest gettext
 
 SRC_URI = "${GNU_MIRROR}/m4/m4-${PV}.tar.gz \
            file://ac_config_links.patch \
+           file://0001-sigsegv-Fix-build-on-ppc-musl.patch \
            "
 SRC_URI:append:class-target = " file://run-ptest \
                                 file://serial-tests-config.patch \
diff --git a/meta/recipes-devtools/m4/m4/0001-sigsegv-Fix-build-on-ppc-musl.patch b/meta/recipes-devtools/m4/m4/0001-sigsegv-Fix-build-on-ppc-musl.patch
new file mode 100644
index 00000000000..04320de63a2
--- /dev/null
+++ b/meta/recipes-devtools/m4/m4/0001-sigsegv-Fix-build-on-ppc-musl.patch
@@ -0,0 +1,37 @@
+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
+
-- 
2.35.1