[meta-java][PATCH 6/9] openjdk-8: gcc-8 fix #2: silence build warnings/errors (return-type)

["André Draszik" <git@andred.net>]

From: André Draszik <andre.draszik@jci.com>

Similar to the patch just reverted, we wilence the build warnings
regarding return type of functions, but we only do this for gcc versions
where it matters, now that our infrastructure for doing so works again:

    | <<PKGBUILDDIR>>/hotspot/src/share/vm/utilities/globalDefinitions_gcc.hpp:223:32: error: control reaches end of non-void function [-Werror=return-type]
    |  #define BREAKPOINT ::breakpoint()
    |                     ~~~~~~~~~~~~^~
    | <<PKGBUILDDIR>>/hotspot/src/share/vm/utilities/debug.hpp:192:3: note: in expansion of macro 'BREAKPOINT'
    |    BREAKPOINT;                                                                \
    |    ^~~~~~~~~~
    | <<PKGBUILDDIR>>/hotspot/src/cpu/aarch64/vm/c1_LIRAssembler_aarch64.cpp:197:2: note: in expansion of macro 'ShouldNotReachHere'
    |   ShouldNotReachHere();
    |   ^~~~~~~~~~~~~~~~~~
    etc.

Signed-off-by: André Draszik <andre.draszik@jci.com>
---
 recipes-core/openjdk/openjdk-8-common.inc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/recipes-core/openjdk/openjdk-8-common.inc b/recipes-core/openjdk/openjdk-8-common.inc
index fb97e97..77d905d 100644
--- a/recipes-core/openjdk/openjdk-8-common.inc
+++ b/recipes-core/openjdk/openjdk-8-common.inc
@@ -216,6 +216,7 @@ EXTRA_OECONF_append = "\
 # of these changes.
 FLAGS_GCC6 = "-fno-lifetime-dse -fno-delete-null-pointer-checks"
 FLAGS_GCC7 = "-fno-lifetime-dse -fno-delete-null-pointer-checks"
+FLAGS_GCC8 = "-Wno-error=return-type"
 
 # All supported cross compilers support the compiler flags that were
 # added to make compilation with gcc6 work. But the host compiler for
-- 
2.18.0