[Buildroot] [PATCH 2/2] package/heirloom-mailx: fix build failure due to gcc bug 101916

[Giulio Benetti]

The heirloom-mailx package exhibits gcc bug 101916 when built for the
SH4 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_GCC_BUG_101916=y.
Also introduce HEIRLOOM_MAILX_CFLAGS as done for other packages and move
the already present -fPIC CFLAG to it.

Fixes:
http://autobuild.buildroot.net/results/911/911f5c024834741754102ff1bbb05c4a64c54a0b/

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

diff --git a/package/heirloom-mailx/heirloom-mailx.mk b/package/heirloom-mailx/heirloom-mailx.mk
index b3cece0cfc..e851e1dfcc 100644
--- a/package/heirloom-mailx/heirloom-mailx.mk
+++ b/package/heirloom-mailx/heirloom-mailx.mk
@@ -20,10 +20,18 @@ define HEIRLOOM_MAILX_CONFIGURE_CMDS
 	(cd $(@D); $(TARGET_CONFIGURE_OPTS) $(SHELL) ./makeconfig)
 endef
 
+HEIRLOOM_MAILX_CFLAGS = $(TARGET_CFLAGS)
+
 # -fPIC is needed to build with NIOS2 toolchains.
+HEIRLOOM_MAILX_CFLAGS += -fPIC
+
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_101916),y)
+HEIRLOOM_MAILX_CFLAGS += -O0
+endif
+
 define HEIRLOOM_MAILX_BUILD_CMDS
 	$(TARGET_CONFIGURE_OPTS) $(MAKE) \
-		CFLAGS="$(TARGET_CFLAGS) -fPIC" \
+		CFLAGS="$(HEIRLOOM_MAILX_CFLAGS)" \
 		-C $(@D)
 endef
 
-- 
2.25.1