musl: fix build on sh3

musl fails to build when compiled with gcc on sh3 (GCC target/#67260).
Work it around.

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

SVN-Revision: 47012

toolchain/musl/common.mk

@@ -23,6 +23,12 @@ HOST_BUILD_DIR:=$(BUILD_DIR_TOOLCHAIN)/$(PKG_NAME)-$(PKG_VERSION)
 include $(INCLUDE_DIR)/toolchain-build.mk
 include $(INCLUDE_DIR)/hardening.mk
 
+# Please see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67260
+ifeq ($(CONFIG_sh3),y)
+TARGET_CFLAGS+= \
+	-fno-optimize-sibling-calls
+endif
+
 MUSL_CONFIGURE:= \
 	$(TARGET_CONFIGURE_OPTS) \
 	CFLAGS="$(TARGET_CFLAGS)" \