pmaports/cross/gcc-armv7/0033-gcc-go-link-to-libucontext.patch

From 0631e2b9453b33c42e12a14c11e8257d470016c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6ren=20Tempel?= <soeren+git@soeren-tempel.net>
Date: Sun, 30 Aug 2020 19:17:42 +0200
Subject: [PATCH] gcc-go: support libucontext

This patch allows using gcc-go with libucontext. For this purpose,
it unconditionally links gcc-go against -lucontext. Furthermore,
it undefines SETCONTEXT_CLOBBERS_TLS in proc.c to prevent usage
of makecontext/swapcontext feature that are not support by libucontext.
---
 Makefile.in          | 2 +-
 libgo/runtime/proc.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile.in b/Makefile.in
index 593495e1650..c3e5d489bc0 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -52801,7 +52801,7 @@ configure-target-libgo:
 	esac; \
 	module_srcdir=libgo; \
 	rm -f no-such-file || : ; \
-	CONFIG_SITE=no-such-file $(SHELL) \
+	CONFIG_SITE=no-such-file LIBS="-lucontext $$LIBS" $(SHELL) \
 	  $$s/$$module_srcdir/configure \
 	  --srcdir=$${topdir}/$$module_srcdir \
 	  $(TARGET_CONFIGARGS) --build=${build_alias} --host=${target_alias} \
diff --git a/libgo/runtime/proc.c b/libgo/runtime/proc.c
index 3a30748d329..a987678fa84 100644
--- a/libgo/runtime/proc.c
+++ b/libgo/runtime/proc.c
@@ -66,6 +66,10 @@ static void gscanstack(G*);
 
 __thread G *g __asm__(GOSYM_PREFIX "runtime.g");
 
+/* libucontext does not seem to support tlsbase, undef the macro
+ * here to make sure we define initcontext and fixcontext as dummies. */
+#undef SETCONTEXT_CLOBBERS_TLS
+
 #ifndef SETCONTEXT_CLOBBERS_TLS
 
 static inline void