[Buildroot] [PATCH 1/1] package/apcupsd: fix missing __exchange_and_add symbol

[James Hilliard]

It seems libsupc++.a is missing __exchange_and_add for uclibc on some
platforms so link with libstdc++ as well on sparc and arcle.

Fixes:
http://autobuild.buildroot.net/results/bb9/bb96f327d5343a3561ea978f480585b418ce52e1/build-end.log
http://autobuild.buildroot.net/results/5a5/5a513669b0e56f38418e42d9ae733554fe6c73f1/build-end.log

Signed-off-by: James Hilliard <james.hilliard1 at gmail.com>
---
 package/apcupsd/apcupsd.mk | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/package/apcupsd/apcupsd.mk b/package/apcupsd/apcupsd.mk
index 410bce9aec..6088a41cc3 100644
--- a/package/apcupsd/apcupsd.mk
+++ b/package/apcupsd/apcupsd.mk
@@ -14,10 +14,18 @@ ifneq ($(BR2_PACKAGE_APCUPSD_MODBUS_USB)$(BR2_PACKAGE_APCUPSD_USB),)
 APCUPSD_CONF_ENV += ac_cv_path_usbcfg=$(STAGING_DIR)/usr/bin/libusb-config
 ifeq ($(BR2_STATIC_LIBS),y)
 APCUPSD_DEPENDENCIES += host-pkgconf
-APCUPSD_CONF_ENV += LIBS="`$(PKG_CONFIG_HOST_BINARY) --libs libusb`"
+APCUPSD_LIBS += `$(PKG_CONFIG_HOST_BINARY) --libs libusb`
 endif
 endif
 
+ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
+# __exchange_and_add symbol is missing from libsupc++ on these platforms
+ifeq ($(BR2_sparc)$(BR2_arcle),y)
+APCUPSD_LIBS += -lstdc++
+endif
+endif
+APCUPSD_CONF_ENV += LIBS+="$(APCUPSD_LIBS)"
+
 ifeq ($(BR2_PACKAGE_APCUPSD_APCSMART),y)
 APCUPSD_CONF_OPTS += --enable-apcsmart
 else
-- 
2.20.1