[Buildroot] [PATCH] package/zeromq: fix build failure due to binutils bug 21464

[Giulio Benetti]

The zeromq package exhibits binutils bug 21464 when built for the Nios2
architecture with optimization enabled, which causes a build failure.

As done for other packages in Buildroot work around this gcc bug by
setting optimization to -O0 if BR2_TOOLCHAIN_HAS_BINUTILS_BUG_21464=y.

Fixes:
http://autobuild.buildroot.net/results/ce351e0e97c2cacc17d4718d39941548c7558559

Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
---
 package/zeromq/zeromq.mk | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/package/zeromq/zeromq.mk b/package/zeromq/zeromq.mk
index 182699403c..135b07b6c6 100644
--- a/package/zeromq/zeromq.mk
+++ b/package/zeromq/zeromq.mk
@@ -23,12 +23,20 @@ ZEROMQ_CONF_ENV = libzmq_cv_sock_cloexec=yes \
 	libzmq_cv_tcp_keepidle=yes \
 	libzmq_cv_tcp_keepintvl=yes
 
+ZEROMQ_CXXFLAGS = $(TARGET_CXXFLAGS)
+
 # Internal error, aborting at dwarf2cfi.c:2752 in connect_traces
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58864
 ifeq ($(BR2_m68k_cf),y)
-ZEROMQ_CONF_OPTS += CXXFLAGS="$(TARGET_CXXFLAGS) -fno-defer-pop"
+ZEROMQ_CXXFLAGS += -fno-defer-pop
+endif
+
+ifeq ($(BR2_TOOLCHAIN_HAS_BINUTILS_BUG_21464),y)
+ZEROMQ_CXXFLAGS += -O0
 endif
 
+ZEROMQ_CONF_OPTS += CXXFLAGS="$(ZEROMQ_CXXFLAGS)"
+
 # Only tools/curve_keygen.c needs this, but it doesn't hurt to pass it
 # for the rest of the build as well (which automatically includes stdc++).
 ifeq ($(BR2_STATIC_LIBS),y)
-- 
2.25.1