[Buildroot] [PATCH 4/4] package/libtorrent-rasterbar: work around gcc bug 85180

[Giulio Benetti]

With Microblaze Gcc version < 8.x the build hangs due to gcc bug
85180: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180. The bug
shows up when building libtorrent-rasterbar with optimization but not
when building with -O0. To work around this, if
BR2_TOOLCHAIN_HAS_GCC_BUG_85180=y we force using -O0.

Fixes:
http://autobuild.buildroot.net/results/410/410e75676abc6bbabe9029ecda969e3d909f3e18/

Signed-off-by: Giulio Benetti <giulio.benetti at micronovasrl.com>
---
 package/libtorrent-rasterbar/libtorrent-rasterbar.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/libtorrent-rasterbar/libtorrent-rasterbar.mk b/package/libtorrent-rasterbar/libtorrent-rasterbar.mk
index 012e972f1d..1d132382e1 100644
--- a/package/libtorrent-rasterbar/libtorrent-rasterbar.mk
+++ b/package/libtorrent-rasterbar/libtorrent-rasterbar.mk
@@ -21,6 +21,10 @@ ifeq ($(BR2_m68k_cf),y)
 LIBTORRENT_RASTERBAR_CXXFLAGS += -fno-defer-pop
 endif
 
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
+LIBTORRENT_RASTERBAR_CXXFLAGS += -O0
+endif
+
 LIBTORRENT_RASTERBAR_CONF_OPTS += CXXFLAGS="$(LIBTORRENT_RASTERBAR_CXXFLAGS)"
 
 ifeq ($(BR2_ENABLE_LOCALE)$(BR2_PACKAGE_LIBICONV),y)
-- 
2.17.1