package/grpc: propagate reverse dependencies

It appears some grpc reverse dependencies aren't propagated properly.

Fixes:
WARNING: unmet direct dependencies detected for BR2_PACKAGE_GRPC
  Depends on [n]: BR2_INSTALL_LIBSTDCPP [=y] && BR2_TOOLCHAIN_HAS_THREADS [=y] && BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS [=y] && BR2_TOOLCHAIN_GCC_AT_LEAST_5 [=y] && !BR2_STATIC_LIBS [=n] && (BR2_TOOLCHAIN_HAS_SYNC_4 [=y] || BR2_TOOLCHAIN_HAS_ATOMIC [=y]) && BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS [=n]
  Selected by [y]:
  - BR2_PACKAGE_FALCOSECURITY_LIBS [=y] && BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS [=y] && BR2_LINUX_KERNEL [=y] && BR2_INSTALL_LIBSTDCPP [=y] && BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 [=y] && BR2_TOOLCHAIN_HAS_THREADS [=y] && !BR2_STATIC_LIBS [=n] && BR2_TOOLCHAIN_USES_GLIBC [=y] && BR2_PACKAGE_LUAINTERPRETER_ABI_VERSION_5_1 [=y]

On BR2_PACKAGE_COLLECTD_GRPC, we take this opportunity to drop the
Config.in comment about the BR2_HOST_GCC_AT_LEAST_4_9, which was
dropped from BR2_PACKAGE_COLLECTD_GRPC in commit
8251d8c2559b25f11684776fc343059cf100657d ("package/grpc: restrict
host-grpc to the absolute minimum")

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/collectd/Config.in

@@ -683,16 +683,15 @@ config BR2_PACKAGE_COLLECTD_GRPC
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC # grpc
 	depends on BR2_INSTALL_LIBSTDCPP # grpc -> protobuf
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # grpc -> protobuf
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 # grpc -> libabseil-cpp
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 # grpc -> libabseil-cpp
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS # grpc
 	select BR2_PACKAGE_GRPC
 	help
 	  Send/receive values using the gRPC protocol.
 
-comment "grpc needs a toolchain w/ C++, gcc >= 4.9, host gcc >= 4.9"
+comment "grpc needs a toolchain w/ C++, gcc >= 5"
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_9 \
-		|| !BR2_HOST_GCC_AT_LEAST_4_9
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_5
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS # grpc
 

package/falcosecurity-libs/Config.in

@@ -1,11 +1,13 @@
 config BR2_PACKAGE_FALCOSECURITY_LIBS
 	bool
+	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS # grpc
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # protobuf
 	depends on BR2_LINUX_KERNEL
 	depends on BR2_INSTALL_LIBSTDCPP # jsoncpp, protobuf, tbb
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # protobuf
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 # grpc
 	depends on BR2_TOOLCHAIN_HAS_THREADS # jq, protobuf, tbb
 	depends on !BR2_STATIC_LIBS # protobuf, tbb
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC # grpc
 	depends on BR2_TOOLCHAIN_USES_GLIBC # tbb
 	depends on BR2_PACKAGE_LUAINTERPRETER_ABI_VERSION_5_1
 	select BR2_PACKAGE_C_ARES

package/sysdig/Config.in

@@ -1,13 +1,15 @@
 config BR2_PACKAGE_SYSDIG
 	bool "sysdig"
+	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS # falcosecurity-libs
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS # falcosecurity-libs
 	depends on BR2_LINUX_KERNEL # falcosecurity-libs
 	depends on BR2_INSTALL_LIBSTDCPP
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # falcosecurity-libs
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 # falcosecurity-libs
 	depends on BR2_TOOLCHAIN_HAS_THREADS # falcosecurity-libs
 	depends on !BR2_STATIC_LIBS # falcosecurity-libs
 	depends on BR2_TOOLCHAIN_USES_GLIBC # falcosecurity-libs
 	depends on BR2_PACKAGE_LUAINTERPRETER_ABI_VERSION_5_1 # falcosecurity-libs
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC # falcosecurity-libs
 	select BR2_PACKAGE_FALCOSECURITY_LIBS
 	select BR2_PACKAGE_NCURSES
 	select BR2_PACKAGE_JSON_FOR_MODERN_CPP
@@ -21,10 +23,12 @@ config BR2_PACKAGE_SYSDIG
 
 	  https://github.com/draios/sysdig/wiki
 
-comment "sysdig needs a glibc toolchain w/ C++, threads, gcc >= 4.8, dynamic library, a Linux kernel, and luajit or lua 5.1 to be built"
+comment "sysdig needs a glibc toolchain w/ C++, threads, gcc >= 5, dynamic library, a Linux kernel, and luajit or lua 5.1 to be built"
+	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
 	depends on BR2_PACKAGE_PROTOBUF_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on !BR2_LINUX_KERNEL || !BR2_INSTALL_LIBSTDCPP \
 		|| !BR2_TOOLCHAIN_HAS_THREADS \
-		|| !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 || BR2_STATIC_LIBS \
+		|| !BR2_TOOLCHAIN_GCC_AT_LEAST_5 || BR2_STATIC_LIBS \
 		|| !BR2_TOOLCHAIN_USES_GLIBC \
 		|| !BR2_PACKAGE_LUAINTERPRETER_ABI_VERSION_5_1