[Buildroot] [PATCH 3/8] package/ffmpeg: re-enable package if BUG_71124 is present

[Giulio Benetti]

With Microblaze Gcc version < 8.x build hangs on compiling.
This is due to bug 71124:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71124
This package has been excluded from building if BUG_71124 is present.
Bug shows up building ffmpeg with optimization.

In config.mk if BR2_TOOLCHAIN_HAS_GCC_BUG_71124=y force using -O0 by:
- add --disable-optimizations to FFMPEG_CONF_OPTS
- passing -O0 to CFLAGS in FFMPEG_CONF_ENV
Then remove 'depends on !BR2_microblaze' from Config.in

Signed-off-by: Giulio Benetti <giulio.benetti at micronovasrl.com>
---
 package/ffmpeg/Config.in | 2 --
 package/ffmpeg/ffmpeg.mk | 5 +++++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/package/ffmpeg/Config.in b/package/ffmpeg/Config.in
index eec7ce0f6b..a5c05d9c1c 100644
--- a/package/ffmpeg/Config.in
+++ b/package/ffmpeg/Config.in
@@ -7,8 +7,6 @@ config BR2_PACKAGE_FFMPEG_ARCH_SUPPORTS
 	depends on !BR2_nios2
 	# No support for ARMv7-M in the ARM assembly logic
 	depends on !BR2_ARM_CPU_ARMV7M
-	# Microblaze build affected by gcc PR71124 (infinite loop)
-	depends on !BR2_microblaze
 	# m68k coldfire causes a build failure, because the check for
 	# atomics (atomic_store) succeeds, which causes ffmpeg to
 	# think atomic intrinsics are available, while they are
diff --git a/package/ffmpeg/ffmpeg.mk b/package/ffmpeg/ffmpeg.mk
index 8c91b149f4..1074a80182 100644
--- a/package/ffmpeg/ffmpeg.mk
+++ b/package/ffmpeg/ffmpeg.mk
@@ -525,6 +525,11 @@ endif
 
 FFMPEG_CONF_OPTS += $(call qstrip,$(BR2_PACKAGE_FFMPEG_EXTRACONF))
 
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_71124),y)
+FFMPEG_CONF_OPTS += --disable-optimizations
+FFMPEG_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -O0"
+endif
+
 # Override FFMPEG_CONFIGURE_CMDS: FFmpeg does not support --target and others
 define FFMPEG_CONFIGURE_CMDS
 	(cd $(FFMPEG_SRCDIR) && rm -rf config.cache && \
-- 
2.17.1