package/libabseil-cpp: depend on (host) gcc >= 4.9

abseil depends on gcc >= 4.9 according to [0] and actually doesn't
compile anymore with the latest version bump.
This didn't show in the autobuilders as the C++11 issue fixed in the
previous commit shadowed it.

also update dependency in package/grpc.

fixes:
 abseil/abseil-cpp#795

[0] https://abseil.io/docs/cpp/platforms/platforms#linux

Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/grpc/Config.in

@@ -3,7 +3,8 @@ config BR2_PACKAGE_GRPC
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS # protobuf, re2
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # protobuf
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # protobuf, re2
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # protobuf, re2, libabseil-cpp
+	depends on BR2_HOST_GCC_AT_LEAST_4_9 # host-libabseil-cpp
 	depends on !BR2_STATIC_LIBS # protobuf, libabseil-cpp
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
@@ -19,9 +20,10 @@ config BR2_PACKAGE_GRPC
 
 	  http://github.com/grpc/grpc
 
-comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.8"
+comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9"
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
-		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+		|| BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 \
+		|| !BR2_HOST_GCC_AT_LEAST_4_9
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS

package/libabseil-cpp/Config.in

@@ -14,6 +14,7 @@ config BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
 config BR2_PACKAGE_LIBABSEIL_CPP
 	bool "libabseil-cpp"
 	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_STATIC_LIBS # uses dlfcn.h
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
@@ -26,7 +27,7 @@ config BR2_PACKAGE_LIBABSEIL_CPP
 
 	  https://github.com/abseil/abseil-cpp
 
-comment "libabseil-cpp needs a toolchain w/ C++, threads, dynamic library"
+comment "libabseil-cpp needs a toolchain w/ gcc >= 4.9, C++, threads, dynamic library"
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || \
-		BR2_STATIC_LIBS
+		BR2_STATIC_LIBS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9