package/apitrace: fix build failure due to gcc bug 68485 and 85180

The apitrace package exhibits gcc bug 68485 when built for the
Microblaze architecture with optimization enabled, which causes a build
failure. This is mainly due to 3rd party brotli embedded in apitrace
that already has been fixed in Buildroot as single package. After
working around this bug overriding -O0 to CFLAGS(Brotli is a C program),
gcc bug 81580 showed off while compiling C++ files.

So, as done for other packages in Buildroot, work around this gcc bug by
setting optimization to -O0(in CFLAGS) if
BR2_TOOLCHAIN_HAS_GCC_BUG_68485=y. And do the same(but in CXXFLAGS) if
BR2_TOOLCHAIN_HAS_GCC_BUG_85180=y as already done for other packages.

Fixes:
http://autobuild.buildroot.net/results/a46/a46626cc50f07f41d831614306f556d346d31429/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
[yann.morin.1998@free.fr: reorganise the conditions]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/apitrace/apitrace.mk

@@ -21,4 +21,21 @@ endif
 # Gui was never tested, so we prefer to explicitly disable it
 APITRACE_CONF_OPTS += -DENABLE_GUI=false
 
+APITRACE_CFLAGS = $(TARGET_CFLAGS)
+APITRACE_CXXFLAGS = $(TARGET_CXXFLAGS)
+
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_68485),y)
+# This works around embedded Brotli build failure
+APITRACE_CFLAGS += -O0
+endif
+
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
+# This works around Apitrace itself build failure
+APITRACE_CXXFLAGS += -O0
+endif
+
+APITRACE_CONF_OPTS += \
+	-DCMAKE_C_FLAGS="$(APITRACE_CFLAGS)" \
+	-DCMAKE_CXX_FLAGS="$(APITRACE_CXXFLAGS)"
+
 $(eval $(cmake-package))